阅读说明：本技术 马达控制装置及电动工具 (Controller for motor and electric tool ) 是由 远藤大辅 清水裕之 宫城贵则 于 2018-04-19 设计创作，主要内容包括：本马达控制装置(32)具有开关(22)、主控制部(36)、马达控制电路(38)、动作电压生成电路(40)、SW/AC监视部(46)、以及动作电压监视部(48)。SW/AC监视部(46)监视开关(SW)的状态或开关(SW)与马达(30)之间的供电线(35)的状态。动作电压监视部(48)监视从动作电压生成电路(40)输出的动作电压(V<Sub>CC</Sub>)的电压电位。主控制部(36)双重检查来自SW/AC监视部(46)的SW/AC监控信号(MS)与来自动作电压监视部(48)的动作电压监控信号(MV)来控制马达(30)的启动及停止。(This controller for motor (32) has switch (22), main control unit (36), motor control circuit (38), operation voltage generative circuit (40), SW/AC monitoring unit (46) and operation voltage monitoring unit (48).The state of supply lines (35) between the state or switch (SW) and motor (30) of SW/AC monitoring unit (46) monitoring switch (SW).Operation voltage (the V that operation voltage monitoring unit (48) monitoring is exported from movement voltage generation circuit (40) CC ) voltage potential.SW/AC monitoring signal (MS) of main control unit (36) duplication check from SW/AC monitoring unit (46) controls the starting and stopping of motor (30) with the operation voltage monitoring signal (MV) from operation voltage monitoring unit (48).)

1. a kind of controller for motor, comprising:

Switch, is arranged relative to the external power supply with the motor with being electrically coupled, and connects for controlling from external power supply By electric power supply and the movement of motor that is rotated；

Operation voltage generative circuit inputs the electric power from the external power supply and exports the operation voltage of direct current；And

1st monitoring unit, monitors the state of the supply lines between the state or the switch and the motor of the switch, and produces Raw 1st monitoring signal, the 1st monitoring signal indicate whether to supply electric power from the external power supply to the supply lines,

The controller for motor is characterized in that, comprising:

2nd monitoring unit monitors the operation voltage, and generates the 2nd monitoring signal, and the 2nd monitoring signal indicates described dynamic The voltage potential for making voltage is higher or lower than preset monitoring value；And

Control unit is acted under the operation voltage, and the information based on the 1st monitoring signal and the 2nd prison The information of signal is controlled to control the starting and stopping of the motor.

2. controller for motor as described in claim 1, wherein

1st monitoring unit includes

Branch circuit is electrically connected in parallel when from the external power supply in back segment and the motor of the switch； And

Whether current detecting part, detection electric current flow to the branch circuit.

3. controller for motor as claimed in claim 2, wherein

The current detecting part has the photoelectrical coupler for being set to the branch circuit,

The phototransistor of the photoelectrical coupler has the 1st terminal and the 2nd terminal, and the 1st terminal is connected to via resistance The voltage supply terminal of the operation voltage, the 2nd terminal are connected to earthing potential terminal, the 1st monitoring signal be What the 1st terminal obtained.

4. controller for motor as claimed in claim 3, wherein

1st monitoring signal is generated as binary signal, and the binary signal, which has, is set in the specified of the operation voltage The 1st threshold value and 2nd threshold value lower than the 1st threshold value between value and earthing potential,

When the voltage potential of the 1st monitoring signal is higher than the 1st threshold value, the control unit is judged as the 1st monitoring Signal has the 1st logical value, when the voltage potential of the 1st monitoring signal is lower than the 2nd threshold value, the control unit judgement There is the 2nd logical value for the 1st monitoring signal.

5. controller for motor as claimed in claim 4, wherein

The 2nd monitoring signal indicate the operation voltage voltage potential it is higher than the monitoring value in the state of, when described When 1st monitoring signal is changed to 2 logical value from the 1st logical value, the control unit starts the motor,

The 2nd monitoring signal indicate the operation voltage voltage potential it is higher than the monitoring value in the state of, when described When 1st monitoring signal is changed to 1 logical value from the 2nd logical value, the control unit stops the motor.

6. controller for motor as claimed in claim 5, wherein

The 2nd monitoring signal indicate the operation voltage voltage potential it is lower than the monitoring value in the state of, even if institute It states the 1st monitoring signal and is changed to the 2nd logical value from the 1st logical value, the control unit does not start the motor still.

7. controller for motor as claimed in claim 5, wherein

The monitoring value is set to, and the switch is to stop under open state from the external power supply input electric power to the confession When electric wire, before the voltage potential of the 1st monitoring signal is lower than the threshold value, the operation voltage is than the monitoring value It is low.

8. the controller for motor as described in any one of claim 5 to 7, wherein

When the voltage potential of the operation voltage is higher than monitoring value, the 2nd monitoring unit is described in the generation of the 1st logical value 2nd monitoring signal, also, when the voltage potential of the operation voltage is lower than monitoring value, the 2nd monitoring unit is with the 2nd Logical value generates the 2nd monitoring signal.

9. controller for motor as claimed in claim 8, wherein

As long as the 2nd monitoring signal have the 2nd logical value, no matter the value of the 1st monitoring signal why, the control unit is equal The motor is not started.

10. controller for motor as described in claim 1, wherein

After just stopping the motor, until from its stop by defined delay time until, no matter it is described 1st prison Why is the value of control signal or the 2nd monitoring signal, and the control unit keeps the halted state of the motor.

11. controller for motor as claimed in claim 10, wherein

The delay time is set to, and stops under open state from the external power supply input electric power to institute with the switch When stating supply lines, the voltage potential of the operation voltage from rated value drop to the time required for the monitoring value it is identical when Between or the time slightly longer.

12. controller for motor as described in claim 1, wherein

After just stopping the motor, the control unit be separated by as defined in delay time and described in stipulated number rechecking 1st monitoring signal and the 2nd monitoring signal.

13. controller for motor as claimed in claim 12, wherein

The delay time is set to drop to needed for the monitoring value than the voltage potential of the operation voltage from rated value Short time time wanted.

14. controller for motor as described in claim 1, wherein

It further include switch element, the switch element is electrically gone here and there relative to the external power supply with the motor and the switch Connection connection,

The control unit carries out switch control to the switch element with certain frequency, so that the rotation for controlling the motor is dynamic Make, and closes the switch element when stopping the motor.

15. controller for motor as described in claim 1, wherein

The external power supply is AC power source,

The operation voltage generative circuit has the friendship that the AC power that the AC power source is inputted is converted to direct current power DC converting circuit,

The ac-dc converter circuit has capacitor in its deferent segment, and using the charging voltage of the capacitor as the operation voltage And it exports.

16. a kind of controller for motor, comprising:

Switch, is arranged relative to the external power supply with the motor with being electrically coupled, and connects for controlling from external power supply By electric power supply and the movement of motor that is rotated；

Operation voltage generative circuit inputs the electric power from the external power supply and exports the operation voltage of direct current；And

1st monitoring unit monitors the state of the supply lines between the state or the switch and the motor of the switch,

The controller for motor is characterized in that, comprising:

2nd monitoring unit monitors that the voltage potential of the operation voltage is higher or lower than preset monitoring value；And

Control unit is acted under the operation voltage, and the prison based on the 1st monitoring unit and the 2nd monitoring unit Visual information controls the starting and stopping of the motor,

The state that the voltage potential of the operation voltage is worth than the monitoring high monitoring information is provided in the 2nd monitoring unit Under, when the 1st monitoring unit provides the switch and has switched to from closed state the monitoring information of open state, the control Portion responds the monitoring information from the 1st monitoring unit and starts the motor；

The state that the voltage potential of the operation voltage is worth than the monitoring high monitoring information is provided in the 2nd monitoring unit Under, the monitoring information being cut off from the external power supply to the electric power input of the supply lines is provided in the 1st monitoring unit When, the control unit responds the monitoring information from the 1st monitoring unit and stops the motor；

The state that the voltage potential of the operation voltage is worth than the monitoring low monitoring information is provided in the 2nd monitoring unit Under, even if the 1st monitoring unit is provided since the external power supply to the electric power input of the supply lines or restarting Monitoring information, the control unit do not start the motor yet.

17. a kind of electric tool, comprising:

Main body；

Movable tool is installed on the main body, to carry out certain movement；

Motor is set in the main body, drives the tool for receiving the supply of electric power from external power supply；

Controller for motor is set in the main body, is controlled for receiving the supply of electric power from the external power supply The movement of the motor, and including switch, operation voltage generative circuit and the 1st monitoring unit, the switch is relative to described outer Portion's power supply and be arranged with being electrically coupled with the motor, the operation voltage generative circuit is entered from the external power supply Electric power and the operation voltage for exporting direct current, the 1st monitoring unit monitor the switch state or it is described switch with the motor Between supply lines state, and generate the 1st monitoring signal, the 1st monitoring signal indicate whether from the external power supply supply To on electric power to the supply lines,

The electric tool is characterized in that the controller for motor includes

2nd monitoring unit monitors the operation voltage, and generates the 2nd monitoring signal, and the 2nd monitoring signal indicates described dynamic The voltage potential for making voltage is higher or lower than preset monitoring value；

And control unit, it is acted under the operation voltage, and the information based on the 1st monitoring signal and described the The information of 2 monitoring signals controls the starting and stopping of the motor.

18. a kind of electric tool, comprising:

Main body；

Movable tool is installed on the main body, to carry out certain movement；

Motor is set in the main body, drives the tool for receiving the supply of electric power from external power supply；

Controller for motor is set in the main body, is controlled for receiving the supply of electric power from the external power supply The movement of the motor, and including switch, operation voltage generative circuit and the 1st monitoring unit, the switch is relative to described outer Portion's power supply and be arranged with being electrically coupled with the motor, the operation voltage generative circuit is entered from the external power supply Electric power and the operation voltage for exporting direct current, the 1st monitoring unit monitor the switch state or it is described switch with the motor Between supply lines state,

The electric tool is characterized in that, comprising:

2nd monitoring unit monitors that the voltage potential of the operation voltage is higher or lower than preset monitoring value；And

Control unit is acted under the operation voltage, and based on from the 1st monitoring unit and the 2nd monitoring unit Monitoring information control the starting and stopping of the motor,

The state that the voltage potential of the operation voltage is worth than the monitoring high monitoring information is provided in the 2nd monitoring unit Under, when the 1st monitoring unit provides the switch and has switched to from closed state the monitoring information of open state, the control Portion responds the monitoring information from the 1st monitoring unit and starts the motor；

The state that the voltage potential of the operation voltage is worth than the monitoring high monitoring information is provided in the 2nd monitoring unit Under, the monitoring information being cut off from the external power supply to the electric power input of the supply lines is provided in the 1st monitoring unit When, the control unit responds the monitoring information from the 1st monitoring unit and stops the motor；

The state that the voltage potential of the operation voltage is worth than the monitoring low monitoring information is provided in the 2nd monitoring unit Under, even if the 1st monitoring unit is provided since the external power supply to the electric power input of the supply lines or restarting Monitoring information, the control unit do not start the motor yet.

Technical field

The present invention relates to the controller for motor of movement and control that the electric power of external power supply is used for motor and electronic works Tool.

Background technique

Now, motor (motor) is used for various uses in the extensive field such as household electrical appliances, industry.Wherein, we week By have much can portable electric appliance, the plug insertion socket of main body will be installed on via power line, and hand over from for example commercial Such external power supply in galvanic electricity source receives power supply to act and act the motor built in main body.In general, this kind Electric appliance is provided to the switch in main body by user's manual activity, and user can control the fortune of the machine with oneself wish Turn/stops.

Nevertheless, the case where plug is inserted into socket in the state of careless unlatching switch by user is had, in the feelings Under condition, when the electric appliance accidental activation, miscellaneous trouble can be generated.When external power supply breaks suddenly during the machine run Electricity, motor stop, immediately power-off telegram in reply and motor can equally generate miscellaneous trouble when surprisingly restarting.

Past, in order to promote safety and workability, has developed various motor control dresses in the field of electric tool It sets, having prevents when socket plug plugs, powers off function (the patent text that motor unexpectedly starts or restarts when sending a telegram in reply Offer 1,2,3).

Summary of the invention

Subject to be solved by the invention

In external power supply mode as described above can be in portable electric appliance, in socket plug plug or of short duration power-off Border, when plug or power-off telegram in reply are turned back to (usually after more than the several seconds) after having spent a period of time after motor stops, due to Controller for motor resets to make reply for the time being, therefore can prevent the unexpected starting or restarting of motor in advance. But if power-off telegram in reply or turning back to plug within 1~2 second after motor stopping, controller for motor is unstable or not Plug is coped with without resetting under determining operation voltage to turn back to, power off telegram in reply, therefore, violates the meaning of user sometimes Scheme and unexpectedly starts or restart motor.

The present invention is the project for solving the above-mentioned prior art, offer can accurately and certainly prevent it is non-go out From user be intended to motor starting or restarting controller for motor and have the electronic of the controller for motor Tool.

Means for solving the problems

Controller for motor in 1st viewpoint of the invention, comprising: switch, relative to the external power supply with it is described Motor is arranged with being electrically coupled, for controlling the movement of motor for receiving the supply of electric power from external power supply and being rotated；It is dynamic Make voltage generation circuit, inputs the electric power from the external power supply and export the operation voltage of direct current；And the 1st monitoring Portion monitors the state of the supply lines between the state or the switch and the motor of the switch, and generates the 1st monitoring letter Number, the 1st monitoring signal indicates whether to supply electric power from the external power supply to the supply lines, the motor control dress It sets and is characterized in that, comprising: the 2nd monitoring unit monitors the operation voltage, and generates the 2nd monitoring signal, and the described 2nd monitors Signal indicates that the voltage potential of the operation voltage is higher or lower than preset monitoring value；And control unit, described It is acted under operation voltage, and based on the information of the information of the 1st monitoring signal and the 2nd monitoring signal to control State the starting and stopping of motor.

In the controller for motor of above-mentioned composition, monitor the 1st monitoring unit between the state or switch and motor of switch Supply lines state, and make the voltage potential of the 2nd monitoring unit monitoring operation voltage, since control unit duplication check is from the The 1st monitoring signal and the 2nd monitoring signal from the 2nd monitoring unit of 1 monitoring unit, to control the starting and stopping of motor, therefore, Surprisingly stop restarting immediately again even if from the electric power input of external power supply, still can accurately and certainly prevent non-come from from making The starting or restarting for the motor that user is intended to.

Controller for motor in 2nd viewpoint of the invention, comprising: switch, relative to the external power supply with it is described Motor is arranged with being electrically coupled, for controlling the movement of motor for receiving the supply of electric power from external power supply and being rotated；It is dynamic Make voltage generation circuit, inputs the electric power from the external power supply and export the operation voltage of direct current；And the 1st monitoring Portion monitors the state of the supply lines between the state or the switch and the motor of the switch, the motor control dress It sets and is characterized in that, comprising: it is preset to monitor that the voltage potential of the operation voltage is higher or lower than for the 2nd monitoring unit Monitoring value；And control unit, it is acted under the operation voltage, and based on the 1st monitoring unit and the 2nd monitoring The monitoring information in portion controls the starting and stopping of the motor, provides the voltage of the operation voltage in the 2nd monitoring unit Current potential is worth in the state of high monitoring information than the monitoring, provides described switch from closed state in the 1st monitoring unit When switching to the monitoring information of open state, the control unit responds the monitoring information from the 1st monitoring unit and starts The motor；It is worth high monitoring information than the monitoring in the voltage potential that the 2nd monitoring unit provides the operation voltage Under state, the monitoring being cut off from the external power supply to the electric power input of the supply lines is provided in the 1st monitoring unit When information, the control unit responds the monitoring information from the 1st monitoring unit and stops the motor；In the 2nd prison In the state of being worth low monitoring information than the monitoring depending on the voltage potential that portion provides the operation voltage, even if the 1st prison Being provided since the external power supply to the electric power input of the supply lines depending on portion or the monitoring information that restarts, the control Portion processed does not start the motor yet.

In the controller for motor of above-mentioned composition, monitor the 1st monitoring unit between the state or switch and motor of switch Supply lines state, and make the voltage potential of the 2nd monitoring unit monitoring operation voltage, since control unit duplication check is from the The monitoring information and the monitoring information from the 2nd monitoring unit of 1 monitoring unit, to control the starting and stopping of motor, even if from outer The electric power input of portion's power supply surprisingly stop again restarting immediately, still can accurately and certainly prevent it is non-come from user intention Motor starting or restarting.

Electric tool in 1st viewpoint of the invention, comprising: main body；Movable tool is installed on the main body, To carry out certain movement；Motor is set in the main body, is driven for receiving the supply of electric power from external power supply The tool；Controller for motor is set in the main body, for receiving the supply of electric power from the external power supply and The movement of the motor is controlled, and including switch, operation voltage generative circuit and the 1st monitoring unit, the switch is relative to institute It states external power supply and is arranged with being electrically coupled with the motor, the operation voltage generative circuit is entered from the external electrical The electric power in source and the operation voltage for exporting direct current, the 1st monitoring unit monitor the switch state or it is described switch with it is described The state of supply lines between motor, and the 1st monitoring signal is generated, the 1st monitoring signal is indicated whether from the external electrical Source is supplied electric power to the supply lines, and the electric tool is characterized in that, the controller for motor includes the 2nd monitoring Portion monitors the operation voltage, and generates the 2nd monitoring signal, and the 2nd monitoring signal indicates the voltage of the operation voltage Current potential is higher or lower than preset monitoring value；And control unit, it is acted under the operation voltage, and be based on institute The information of the information and the 2nd monitoring signal of stating the 1st monitoring signal controls the starting and stopping of the motor.

In the electric tool of above-mentioned composition, by having the controller for motor in the 1st viewpoint of the invention, even if from The electric power input of external power supply surprisingly stop again restarting immediately, still can accurately and certainly prevent it is non-come from user intention Motor starting or restarting, promote safety and workability.

Electric tool in 2nd form of the invention, comprising: main body；Movable tool is installed on the main body, To carry out certain movement；Motor is set in the main body, drives institute for receiving the supply of electric power from external power supply State tool；Controller for motor is set in the main body, is controlled for receiving the supply of electric power from the external power supply The movement of the motor is made, and including switch, operation voltage generative circuit and the 1st monitoring unit, the switch is relative to described External power supply and be arranged with being electrically coupled with the motor, the operation voltage generative circuit is entered from the external power supply Electric power and export the operation voltage of direct current, the 1st monitoring unit monitors state or the switch and the horse of the switch The state of supply lines between reaching, the electric tool are characterized in that, comprising: the 2nd monitoring unit monitors the operation voltage Voltage potential be higher or lower than preset monitoring value；And control unit, it is acted under the operation voltage, and The starting and stopping that the motor is controlled based on the monitoring information from the 1st monitoring unit and the 2nd monitoring unit, in institute It states the 2nd monitoring unit and provides the voltage potential of the operation voltage and be worth in the state of high monitoring information than the monitoring, described 1st monitoring unit provides the switch when having switched to the monitoring information of open state from closed state, and the control unit response comes Start the motor from the monitoring information of the 1st monitoring unit；The electricity of the operation voltage is provided in the 2nd monitoring unit Piezoelectric position is worth in the state of high monitoring information than the monitoring, provides in the 1st monitoring unit from the external power supply to institute When stating the monitoring information that the electric power input of supply lines has been cut off, the control unit responds the prison from the 1st monitoring unit Visual information and stop the motor；It is lower than the monitoring value in the voltage potential that the 2nd monitoring unit provides the operation voltage Monitoring information in the state of, even if the 1st monitoring unit provides the electric power input from the external power supply to the supply lines The monitoring information for having started or having restarted, the control unit do not start the motor yet.

In the electric tool of above-mentioned composition, by having the controller for motor in the 2nd viewpoint of the invention, even if from The electric power input of external power supply surprisingly stops starting again immediately, still can accurately and certainly prevent it is non-come from user intention Motor starting or restarting, promote safety and workability.

Invention effect

Controller for motor according to the present invention, by constituting and acting on as described above, for from external power supply The input of electric power stops and subsequent input restarts, and can accurately and certainly prevent the non-motor for coming from user's intention from opening Dynamic or restarting.

Electric tool according to the present invention, by constituting and acting on as described above, can accurately and certainly prevent it is non-go out The motor starting being intended to from user or restarting, and promote safety and workability.

Detailed description of the invention

Fig. 1 is to indicate the electrodynamic type as the electric tool in an embodiment of the present invention with the solid of the appearance of grinding machine Figure.

Fig. 2 is the block diagram for indicating above-mentioned electrodynamic type and constituting with the system of grinding machine motor mounted and controller for motor.

Fig. 3 is the circuit diagram for indicating the physical circuit of the controller for motor in above embodiment and constituting.

Fig. 4 is the main control indicated in above embodiment with motor starting and the related said motor control device of stopping The flow chart of the basic control flow journey in portion.

Fig. 5 is indicated in above embodiment, when will switch be set as closed state and by plug be inserted into socket when, by outside The timing diagram of the state of each section in the case where power supply normal power supply.

Fig. 6 is indicated in above embodiment, when will switch be set as open state and by plug be inserted into socket when, by outside The timing diagram of the variation of the state of each section in the case where power supply normal power supply.

Fig. 7 is indicated in above embodiment, and the electric power input during operating from external power supply stops then vertical for the time being The timing diagram of the variation of the state of each section in an example restarted.

Fig. 8 is indicated in above embodiment, and the electric power input during operating from external power supply stops then vertical for the time being The timing diagram of the variation of the state of each section in another example restarted.

Fig. 9 is to indicate the case where removing operation voltage monitoring unit from the controller for motor of above embodiment (comparative example) In main control unit basic control flow journey flow chart.

Figure 10 is the timing diagram for indicating the variation of the state of each section in comparative example (Fig. 9).

Figure 11 is the flow chart for indicating a variation of control flow for the main control unit in said motor control device.

Specific embodiment

Illustrate one embodiment of the present invention referring to the drawings.

[appearance of electric tool is constituted]

Appearance Fig. 1 shows the electrodynamic type as the electric tool in an embodiment of the present invention with grinding machine.The electrodynamic type There is cylindric main body 10 with grinding machine 1, socket plug 14 that the base end part of the main body 10 is installed on via power line 12, It is rotatably mounted in the grinding strip 16 of the front end of main body 10, extends from the base end part of the grinding strip 16 in entire front end Movable grinding strip 18, be fixed to the rodlike handle 20 of grinding strip 16, be set to the appropriate position of peripheral surface of main body 10 The switch 22 and display unit 24 set.

Main body 10 also serves as the folk prescription grip part matched with handle 20, and the aftermentioned motor 30 of its inner containment and motor The circuit substrate of control device 32 (Fig. 2 and Fig. 3).Also, in the front end of main body 10, also accommodates and drive the rotation of motor 30 Power reaches the transmission mechanisms such as the gear of grinding strip 16 (not shown).Grinding strip 16 accommodates driving pulley (not in its base end part Diagram), also, driven pulley (not shown) is installed in its front end, the stretching of cricoid grinding strip 18 be set to two belt wheels it Between.In processing, the rotary driving force of motor 30 reaches grinding strip 18, grinding strip via above-mentioned transmission mechanism and driving pulley etc. 18 exist while the machined object that rubs (not shown) moves along a straight line between two belt wheels, is thus ground or grinds and is processed Object.

Switch 22 is made of the manual switch of such as slidingtype, when user decontrols finger in its open position or closed position When, it is locked in the position that it is decontroled.Display unit 24 has for example multiple LED or lamp, lights or flash to come with defined illuminant colour Warning etc. when showing the running-active status or abnormal case with grinding machine.

[composition of controller for motor]

Fig. 2 indicates system structure of the electrodynamic type with grinding machine motor 30 mounted and controller for motor 32 with block diagram At.

Motor 30 is made of such as single phase ac motor, via socket plug 14, electric wire 12 (Fig. 1) and switch 22 from example As commercial AC (exchange) power supply 34 receives have certain virtual value V_EThe AC electric power E of the commercial frequency of (such as 100 volts) Supply, to carry out spinning movement under the control of controller for motor 32.

Controller for motor 32 has switch 22, main control unit 36, motor control circuit 38, operation voltage generative circuit 40, reference clock/when prelude 42, motor rotations measurement unit 44, SW/AC monitoring unit 46, operation voltage monitoring unit 48 is as basic It constitutes.

Operation voltage generative circuit 40 is electrically arranged relative to AC power supplies 34 with motor 30 in parallel, and is configured to input AC electric power E from AC power supplies 34, and with the operation voltage V of defined rated value (such as 5 volts) output direct current_CC.From movement The operation voltage V that voltage generation circuit 40 exports_CCIt supplies via operation voltage supply line to needing in the controller for motor 32 All units or integrated circuit of operation voltage.

Motor control circuit 38 is arranged relative to AC power supplies 34 with switch 22 and motor 30 with being electrically coupled.When electric from AC When source 34 inputs AC electric power E and switch 22 in the open state via plug 14 and electric wire 12, in the control of main control unit 36 Under, motor control circuit 38 controls the electric current for flowing to motor 30.

Reference clock/when prelude 42 include oscillator 50 and zero cross detection portion 52.Oscillator 46 is by such as crystal oscillation Device is constituted, and generates fundamental clock CK required for the operation in main control unit 36 and other processing.It examines in zero cross detection portion 52 The opportunity that the exchange of the commercial frequency supplied from AC power supplies 34 intersects with zero potential is surveyed, and generates main control unit 36 and carries out motor The time series pulse signals CZ of benchmark required for 30 ignition control or phase controlling.

Motor rotations measurement unit 44 includes the rotation sensor 54 of the position of the rotary body (rotor) of detection motor 30 And the revolution operational part 56 of the rotation speed of motor 30 is calculated based on the output signal of the rotation sensor 54.

SW/AC monitoring unit 46 is the 1st monitoring unit in present embodiment, is configured to monitor the state or switch SW of switch SW The state of supply lines 35 between motor 30, and SW/AC monitoring signal (the 1st monitoring signal) MS is generated, it indicates to come from AC Whether the electric power of power supply 34 is input to supply lines 35.

Operation voltage monitoring unit 48 is the 2nd monitoring unit in present embodiment, is configured to input and monitor and electric from movement Press the supply of generative circuit 40 to the operation voltage V of main control unit 36_CCIdentical voltage, and generate operation voltage monitoring signal the (the 2nd Monitoring signal) MV, indicate operation voltage V_CCVoltage potential be above or below preset monitoring value.

As described above, main control unit 36 from movement 40 input action voltage V of voltage generation circuit_CC, from reference clock/timing Portion 42 (50,52) inputs fundamental clock CK and time series pulse signals CZ, and inputting from motor rotations measurement unit 44 (54,56) indicates horse Up to the revolution measured value of 30 rotation speed, SW/AC monitoring signal MS is inputted from SW/AC monitoring unit 46, and supervise from operation voltage Depending on 48 input action voltage monitoring signal MV of portion.Main control unit 36 has signal processing and operation processing function, passes through motor control Circuit 38 processed controls starting, spinning movement and the stopping of motor 30.

Indicate that the physical circuit of the controller for motor 32 in present embodiment is constituted in Fig. 3.Main control unit 36 and revolution Operational part 56, it is preferred that, it is made of microcomputer (microcomputer, microcomputer).Rotation sensor 54, It is preferred that being made of Hall IC (Hall IC).Operation voltage generative circuit 40 is made of ac-dc converter circuit, is made For preferred embodiment, there is full-wave rectifying circuit 62 and output circuit composed by input capacitance 60,4 diodes bridged 74, the output circuit 74 include for smooth or inhibit the Zener diode 64 of ripple (ripple), 66, resistance 68,70 and Capacitor 72.

Zero cross detection portion 52, it is preferred that, it is made of photoelectrical coupler 76.When from AC power supplies 34 input AC electric power When E, only when the exchange of the commercial frequency intersects with zero potential, the phototransistor 76a ability moment of photoelectrical coupler 76 is closed It is disconnected, and time series pulse signals CZ is obtained in the collector terminal of phototransistor 76a, indicate each half cycle of AC commercial frequency Machine at the beginning of phase.Time series pulse signals CZ is supplied to the predetermined input port of main control unit 36.

Motor control circuit 38, it is preferred that, there is bidirectional thyristor (bidirectional thyristor) 78 And photoelectricity triacs (photo triac) 80.Here, bidirectional thyristor 78 constitutes switch element, and It is electrically coupled and connect with switch 22 and motor 30 relative to AC power supplies 34.Photoelectricity triacs 80 and week The capacitor 82 and resistance 83,84 on side combine and constitute firing circuit or phase-control circuit, and light emitting diode 80a is connected to master The regulation output port of control unit 36.Main control unit 36 (is put out by the unlatching (lighting) and closing of control light emitting diode 80a Go out), the desired angle of ignition or phase of time series pulse signals CZ are synchronized with via photoelectricity triacs 80 Parallactic angle controls bidirectional thyristor 78, and can arbitrarily control the electric current for flowing to motor 30.

In this way, which motor control circuit 38 in firing circuit or phase-control circuit by using photoelectricity three terminal bidirectional Silicon controlled rectifier switch element 80, by the electricity of the motor-driven system acted under the high voltage of AC power supplies 34 (AC100 volts) The circuit electrical insulated separation on road and the control system acted with operation voltage (DC5 volts).

SW/AC monitoring unit 46, it is preferred that, have electrically be connected in parallel to supply lines 35 or motor 30 branch or Branch circuit 86, and the resistance 90 of photoelectrical coupler 88 and limitation electric current is connected to the branch circuit 86.Here, photoelectricity The collector terminal of the phototransistor 88a of coupler 88 is connected to operation voltage V via pull-up resistor 92_CCVoltage supply line Or terminal and the regulation input port for being connected to main control unit 36, and the emitter terminal of phototransistor 88a is connected to Earthing potential terminal.

In thus configured SW/AC monitoring unit 46, the AC electric power E from AC power supplies 34 is input to supply lines via switch 22 When 35, no matter the state (rotation/stopping) of motor 30 why, electric current flow to the photoelectricity of branch circuit 86 and photoelectrical coupler 88 Transistor 88a conducting becomes earthing potential i.e. L current potential in the SW/AC monitoring signal MS that its collector terminal obtains.But when When AC electric power E is input to operation voltage generative circuit 40 but is not input to supply lines 35 (when switch 22 is in off state), light The phototransistor 88a of electric coupler 88 is turned off, and becomes operation voltage in the SW/AC monitoring signal MS that its collector terminal obtains V_CCCurrent potential, that is, H current potential.Main control unit 36 receives at any time and monitors SW/AC monitoring signal MS, when its voltage potential is than defined H Potential threshold V_HWhen (such as 2.0 volts) are high, monitoring signal MS is judged for H current potential (MS=" H "), and when than defined L current potential Threshold value V_LWhen (such as 0.8 volt) is low, judge monitoring signal MS for L current potential (MS=" L ").In addition, working as the electricity of monitoring signal MS Piezoelectric position is in L potential threshold V_LWith H potential threshold V_HBetween when, then be uncertain.

In this way, which SW/AC monitoring unit 46 passes through in the current detecting for whether flowing to branch circuit 86 for detecting electric current Photoelectrical coupler 88, the current detection circuit that will be acted under the high voltage of AC power supplies 34 (AC100 volts) are used in portion It is separated with the monitoring signal output circuit electric insulation acted with operation voltage (DC5 volts).

Operation voltage monitoring unit 48, it is preferred that, it is made of integrated circuit, although illustration omitted, has and compare Device and output circuit, the comparator compare the operation voltage V inputted from movement voltage generation circuit 40_CCVoltage potential and in advance The monitoring value V of setting_KAnd the comparison result for indicating the two height relationship is exported, which will come from the comparison of the comparator As a result main control unit 36 is assigned as the operation voltage monitoring signal MV of two-value.More specifically, as operation voltage V_CCVoltage Current potential is than monitoring value V_KGao Shi with H current potential output monitoring signal MV, and works as operation voltage V_CCVoltage potential than monitoring value V_KIt is low When, with L current potential output monitoring signal MV.As operation voltage V_CCVoltage potential and monitoring value V_KWhen identical, it is judged as MV=" H " Or MV=" L ".Monitoring value V_KBe set as than main control unit 36 can normal operation operation voltage V_CCThe high value of limiting value. For example, if operation voltage V_CCRated value V_SIt is 5 volts, then monitoring value V_KIt is set as 4.5 volts.

It is 3 LED 94R, 94Y, 94B of red, yellow, blue (or green) that display unit 24, which has such as illuminant colour,.These LED 94R, 94Y, 94B are connected in parallel to the output port of main control unit 36, and respective light, extinguish unit control.

[effect of controller for motor]

Then, referring to Fig. 4~Figure 11, illustrate the effect of the controller for motor 32 in present embodiment.

In Fig. 4 with flow chart indicate in the controller for motor 32 with the starting of motor 30 and stop related main control unit 36 basic control flow journey.In addition, being indicated during this electrodynamic type band mill running with timing diagram from AC power supplies 34 in Fig. 5 and Fig. 6 The variation of the state of each section in the case where normal supply AC electric power.

In the controller for motor 32, when plug 14 be inserted into AC power supplies 34 socket when, regardless of switch 22 state why, AC electric power E from AC power supplies 34 is input to operation voltage generative circuit 40, and from movement 40 output action of voltage generation circuit Voltage V_CC.At this point, operation voltage V_CCRated value V is risen to from 0 volt of moment before_S(DC5 volts).When the operation voltage V_CCRise to rated value V_SWhen, in operation voltage V_CCLower each section acted, i.e. main control unit 36, motor rotations measurement unit 44 (54,56), operation voltage monitoring unit 48 etc. become activation.On the other hand, while AC electric power E starts input, start certainly Zero cross detection portion 48 supplies time series pulse signals CZ to main control unit 36.

Main control unit 36 is first by initialization, needed for register and input/output port for using for this etc. carry out Initial setting (the step S wanted₁₀₁).In the initialization, unit delay time T is set_PSetting value (such as 10ms) and delay Times N_SSetting value (such as 5 times).Then, initialization (N=0) (step S of decay time is carried out_R).In addition, unit delay Time T_PIt is set to than aftermentioned monitoring value arrival time T_KShort value.Then, main control unit 36 passes through defined input port It receives the SW/AC monitoring signal MS from SW/AC monitoring unit 46 and reads its logical value (step S₁₀₂)。

As shown in figure 5, in general, user by plug 14 be inserted into AC power supplies 34 socket when (time point t₀), switch 22 becomes Closed state.In this case, in SW/AC monitoring unit 46, due to there is no electric current to flow to branch circuit 86, the light of photoelectrical coupler 88 Electric transistor 88a is in an off state.While AC electric power E starts input as a result, i.e., in time point t₀, with operation voltage V_CC Rising linkedly, SW/AC monitoring signal MS from L potential change before be H current potential.Therefore, main control unit 36 is judged as MS =" H ", by delay time T_P(step S_F) after, read the operation voltage monitoring signal MV from operation voltage monitoring unit 48 Value (step S₁₀₃).At this point, operation voltage V_CCRise to rated value (5 volts), MV=" H ".

Main control unit 36 carries out 5 wheel circular treatment [C] (step S when confirming the state of MS=" H " and MV=" H "_P→ S_104c→S₁₀₅→S₁₀₂→S_F→S₁₀₃→S_P→), and when decay time N reaches setting times N_SWhen (5 times), i.e., from the time Point t₀When by 50ms (10ms × 5), circular treatment [C] is jumped out and in order to which starter motor 30 is prepared (step S_P→S₁₀₆), Then circular treatment [D] (step S is persistently carried out₁₀₇→S₁₀₈→S₁₀₇→), wait SW/AC monitoring signal MS to become from H current potential Turn to L current potential.

As shown in figure 5, it is at the time of user opens switch 22 that SW/AC monitoring signal MS, which is L current potential from H potential change, (time point t₁).At this point, electric current begins flow to branch circuit 86, the photoelectric crystal of photoelectrical coupler 88 in SW/AC monitoring unit 46 Pipe 88a becomes on state from off state before, and SW/AC monitoring signal MS becomes L current potential from H current potential.

(the time point t when SW/AC monitoring signal MS becomes L current potential from H current potential of main control unit 36₁), pass through motor control 38 starter motor of circuit, 30 (step S₁₀₇→S₁₀₉).Thereafter, main control unit 36 monitors SW/AC monitoring signal MS, and confirmation should on one side Monitoring signal MS is L current potential, persistently carries out circular treatment [E] (step S on one side₁₀₉→S₁₁₀→S₁₁₁→S₁₀₉→), continue The spinning movement of motor 30.

So continue motor 30 spinning movement during, main control unit 36 on one side by motor rotations measurement unit 44 (54, 56) revolution for measuring motor 30 even loads, and controls the electric current for flowing to motor 30 by motor control circuit 38 on one side, and pass through Display unit 24 informs the user running-active status (especially load state) in real time.For example, usually or when non-loaded (revolution maximum) Indigo plant (green) LED 94B is lighted, lights yellow LED 94Y when gently loading (revolution 80%), and will when high load (revolution 60%) The red LED 94R of lamp is lighted.Also, when overload, following display control can be carried out, that is, for example to make red LED94R with 0.2 second Stop motor 30 after being spaced high speed scintillation, after and then stopping, immediately switches to red LED94R with such as 1 from high speed scintillation Interval low speed flashing of second etc..

Then, which terminates with the grinding of grinding machine, (the time point t when user turns off the switch 22₂), SW/ AC monitoring signal MS from L potential change before be H current potential.At this point, no electric current flow to branch's electricity in SW/AC monitoring unit 46 The phototransistor 88a on road 86, photoelectrical coupler 88 becomes shutdown.

When SW/AC monitoring signal MS from L potential change be H current potential when, main control unit 36 the opportunity by motor control electricity The switch element 78 on road 38 completely closes and stops (the step S of motor 30₁₁₀→S₁₁₂).Then, the initialization of decay time is carried out (N=0) (step S₁₁₃→S_R), it is carried out similarly circular treatment [C] after just having started input with AC electric power E, with setting for decay time Determine times N_S(5 times) repeat the confirmation of MS=" H " and MV=" H ", into preparation (the step S of motor starting_P→S₁₀₆), so Circular treatment [D] persistently is carried out afterwards, switch 22 is waited to be switched to unlatching.

User's a period of time hereafter is illustrated in the example shown in FIG. 5, such as by the time point more than several seconds t₃On by plug 14 from socket extract the case where.In this case, main control unit 36 is no longer in the future when plug 14 is extracted from socket It is input to operation voltage generative circuit 40 from the AC electric power E of AC power supplies 34, the output voltage of operation voltage generative circuit 40 is i.e. dynamic Make voltage V_CCZero volt is dropped to from rated value.In this case, what the output capacitance 72 of operation voltage generative circuit 40 was put aside Charge discharges via resistance 70, thus operation voltage V_CCIt is gradually reduced with regular hour constant.Then, as operation voltage V_CC When lower than defined movement limiting value (for example, about 1.8 volts), main control unit 36 becomes unactivated state.

Fig. 6 be user will switch 22 be set as open state when plug 14 is inserted into the socket of AC power supplies 34 the case where. In this case, no matter the state of switch 22 why, equal (time points while starting to input the AC electric power E from AC power supplies 34 t₀), operation voltage generative circuit 40 is by operation voltage V_CCRise to rated value V_S, operation voltage monitoring signal MV is from L before Current potential rises to H current potential.

In this case, main control unit 36, when in initially setting (step S₁₀₁) read SW/AC monitoring signal MS immediately later When (step S₁₀₂), monitoring signal MS is maintained at L current potential.That is, in SW/AC monitoring unit 46, since switch 22 is open state, Electric current begins flow to branch circuit 86 while AC electric power E starts input, and the phototransistor 88a of photoelectrical coupler 88 becomes to lead Logical state, so that SW/AC monitoring signal MS is maintained at L current potential.Main control unit 36 persistently carries out circular treatment [A] (step S₁₀₂→ S_104a→S_R→S₁₀₂→S_104a), wait monitoring signal MS to become H current potential from L current potential.

Then, when switch 22 is switched to closing by user, electric current is not had to flow to branch circuit in SW/AC monitoring unit 46 86, the phototransistor 88a of photoelectrical coupler 88 shutdown, and SW/AC monitoring signal MS from L potential change be H current potential.Therefore, Main control unit 36 confirms the state of MS=" H " and MV=" H ", carries out 5 wheels circular treatment [C], when decay time N reaches setting time Number N_SWhen (5 times), i.e., from time point t₀When by 50ms (10ms × 5), into preparation (the step S for starter motor 30_P→ S₁₀₆), circular treatment [D] is persistently carried out until switch 22 switches to unlatching.

Then, (the time point t when user opens switch 22₁), due to SW/AC monitoring signal MS from H potential change be L Current potential, therefore jump out circular treatment [D] and (the step S of starter motor 30₁₀₇→S₁₀₉), it carries out circular treatment [E] and continues motor 30 spinning movement.Then, when user turns off the switch 22, or by plug 14 from socket extract when, due to monitoring signal MS is H current potential from L potential change, stops (the step S of motor 30₁₁₀→S₁₁₂).Thereafter control program and movement and the case where Fig. 5 It is identical.

In this way, in this embodiment, though user will switch 22 be set as open state when plug 14 inserted Enter the socket of AC power supplies 34, motor 30 not will start still, when switch 22 being switched to closing for the time being and then switching to unlatching again Starter motor 30.

Incidentally, as shown in fig. 7, during motor 30 is continuing spinning movement, in such as time point t_a, send out suddenly Raw power failure or plug 14 surprisingly come out of the socket.In this case, the input of AC electric power E stops for the time being, thus even if switch 22 is in the open state, still stops the power supply to supply lines 35 and to the power supply of motor 30, to operation voltage generative circuit 40 Stop.But in operation voltage generative circuit 40, the electric power put aside by the capacitor 72 of output circuit 74 with it is certain when Between constant discharge, therefore its output voltage, that is, operation voltage V_CCFrom rated value V before_SExponentially decline, as normal It is the same when plug 14 is extracted from socket.

Therefore, while the input of AC electric power E stops, in SW/AC monitoring unit 46, it flow to branch circuit 86 so far Electric current is cut off, the phototransistor 88a shutdown of photoelectrical coupler 88, and SW/AC monitoring signal MS is from L potential change before H current potential.Main control unit 36 is stopped on the opportunity of monitoring signal MS variation (MS=" L " → " H ") by motor control circuit 38 (the step S of motor control 30₁₁₀→S₁₁₂)。

In the example of fig. 7, following situations are indicated, that is, just through the time point t stopped from the input of AC electric power E_a To operation voltage V_CCVoltage potential be kept to monitoring value V_KUntil certain time (monitoring value arrival time) T_K(such as 30ms) Time point afterwards, such as dwell time point t is inputted from AC electric power E_aIt has passed through the time point t of 40ms_c, user by plug 14 again It is inserted into socket, the input of AC electric power E restarts.

In this case, when in time point t_cWhen the input of AC electric power E from AC power supplies 34 restarts, operation voltage is raw Make operation voltage V at 40 moment of circuit_CCBack to rated value V_S, operation voltage monitoring unit 48 also makes operation voltage monitoring signal MV Moment from L potential change be H current potential.On the other hand, while the input of AC electric power E restarts, SW/AC monitoring unit 46 makes The phototransistor 88a of photoelectrical coupler 88 is connected, and makes the voltage potential moment of SW/AC monitoring signal MS from H current potential before Drop down onto zero volt (L current potential).In addition, when AC electric power E input stop when, the voltage potential of SW/AC monitoring signal MS for the time being on Rise to rated value V_SNear, then copy operation voltage V_CCExponentially decline.Main control unit 36 is judged as MS=" H ", directly Voltage potential to SW/AC monitoring signal MS is kept to H potential threshold V_H。

The process flow of main control unit 36 in this case is as described below.That is, carrying out decay time after stopping motor 30 Initialization (N=0) (step S₁₁₃→S_R), confirm MS=" H " and MV=" H ", persistently carries out circular treatment [C].In this phase Between, when by above-mentioned monitoring value arrival time T_KWhen (30ms), due to being from H potential change in the operation voltage monitoring signal MV L current potential, therefore circular treatment [B] (step S is moved to from circular treatment [C]₁₀₃→S_104b→S_R→S₁₀₂→S_F→S₁₀₃→··)。 Then, in subsequent time point t_cOn, when the input of AC electric power E restarts and operation voltage monitoring signal MV is extensive from L current potential When arriving H current potential again, circular treatment [B] is jumped out, carries out inspection (the step S of decay time₁₀₃→S_P).At this point, due to decay time Not yet reach setting times N_S(5 times), therefore enter circular treatment [C] and check SW/AC monitoring signal MS (step S_P→S_104c →S₁₀₅→S₁₀₂).Then, due to MS=" L ", enter circular treatment [A] (step S₁₀₂→S_104a→S_R→), thereafter Also persistently circular treatment [A] is carried out.

In the present embodiment, even if the input in AC electric power E restarts time point t_cMore than unit delay time (10ms) sets times N multiplied by delay_SIn the case where resulting time (50ms), main control unit 36 remains in circular treatment [A] In~[C], motor starting will not be transferred to and prepare (step S₁₀₆).That is, when carrying out 4 circular treatment [C], i.e., electric from AC Power inputs dwell time point t_aBy the time point t of 40ms_b, operation voltage monitoring signal MV from H potential change be L current potential, thus Circular treatment [B] (step S is transferred to from circular treatment [C]₁₀₃→S_104b→S_R→··).Thereafter, when in time point t_cAC electricity When power E input restarts, although jumping out circular treatment [B] (step S₁₀₃→S_P), but due to decay time not up to setting time Number N_S(5 times) enter circular treatment [C] (step S for the time being_P→S_104c→S₁₀₅→S₁₀₂).But due to the letter of SW/AC monitoring at this time Number MS is L current potential, is transferred to circular treatment [A] (step S from circular treatment [C]₁₀₂→S_104a→S_R→), it is then left in and follows Ring is handled in [A].

In the example of Fig. 8, following situations are indicated, that is, in the time point t stopped from the input of AC electric power E_aBy monitoring It is worth arrival time T_KTime point before (30ms) is (such as from AC electric power input dwell time point t_aBy the time point of 20ms) t_β, By plug 14 again insertable into socket, the input of AC electric power E restarts user.

The process flow of main control unit 36 in this case is as described below.That is, carrying out decay time after motor 30 stops Initialization (N=0) (step S₁₁₃→S_R), then check the logic of SW/AC monitoring signal MS and operation voltage monitoring signal MV It is worth (step S₁₀₂、S₁₀₃).Then, after AC electric power input just stops, due to MS=" H ", MV=" H ", immediately continue into Row circular treatment [C].Then, when in monitoring value arrival time T_KTime point t before (30ms)_β, the input of AC electric power E opens again When the beginning, SW/AC monitoring signal MS (step S is checked in circular treatment [C]₁₀₃→S_104c→S₁₀₅→S₁₀₂).Then, due to SW/ AC monitoring signal MS is also in time point t_βIt is L current potential from H potential change, therefore enters circular treatment [A], remains in circulation thereafter It handles in [A].

In this way, in the present embodiment, monitoring information of 36 duplication check of main control unit from SW/AC monitoring unit 46 (MS) with the monitoring information (MV) from operation voltage monitoring unit 48, operation voltage V is provided in operation voltage monitoring unit 48_CCElectricity Piezoelectric position is than defined monitoring value V_KIn the state of low monitoring information (MV=" L "), opened even if SW/AC monitoring unit 46 provides Begin or restart to input AC electric power from AC power supplies 34 to the monitoring information (MS=" H " → " L ") of supply lines 35, motor 30 is still not It will start.

During carrying out grinding with electrodynamic type band grinding machine as a result, when plug 14 violate the intention of user from When socket is extracted, even if plug 14 is hastily turned back to socket, motor 30 not will start still.Even if AC power supplies 34 during grinding It is also same for having a power failure send a telegram in reply immediately again in the case where suddenly.In this case, then user by turning off the switch 22 for the time being It is again turned on switch 22, motor 30 can be restarted.

In addition, main control unit 36 passes through the warning of display unit 24, example when preventing the restarting of motor 30 as described above Such as flash green LED 94G low speed, to urge user's Operation switch 22.

Incidentally, as comparative example, operation voltage monitoring unit 48 is being removed from the controller for motor in present embodiment In the case where, the control flow of main control unit 36 be as shown in figure 9, the voltage potential or logical value of each section as illustrated in fig. 10 Variation.In this case, the control flow of main control unit 36 does not include checking the monitoring information for coming from operation voltage monitoring unit (48) Process (the step S of (operation voltage monitoring signal MV)₁₀₃), delay concerned process steps (step S_R、S_F、S_P), circular treatment [B], [C] Deng main control unit 36 is based only upon the monitoring information (SW/AC monitoring signal MS) from SW/AC monitoring unit 46 to control motor 30 Starting and stopping.For this purpose, (the time point input of AC electric power E stops restarting immediately suddenly during grinding again when t_c), SW/AC monitoring signal MS is L current potential from H potential change, and main control unit 36 makes a response this and restarts motor 30 (step S₁₀₆→S₁₀₉).It, can be to user or surrounding but due to the intention of restarting and non-user as such It is artificial at danger, it is from operation and undesirable.

[other embodiments or variation]

Though the preferred embodiment of the present invention is illustrated above, the present invention is not limited to above embodiment.Having In body embodiment, in the case where not departing from technical idea of the invention and technical scope, those skilled in the art can be applied Add various modifications and change.

For example, the control flow (Fig. 4) of main control unit 36 can also be deformed into shown in Figure 11 in above embodiment.It should Variation or the 2nd embodiment omit delay initiating procedure (step S_R), decay time inspection operation (step S_P) and circulation at It manages [C], SW/AC monitoring signal is instead added and reexamines process (step S_G) and circular treatment [F].Here, delay Process (step S_F) in delay time T_PIt is set at and is equal to or slightly greater than monitoring value arrival time T_KValue (the example of (30ms) Such as 30~35ms).By the control flow of the embodiment, movement identical with Fig. 7 and Fig. 8 can also be carried out.

That is, in the case of fig. 7, in the time point t stopped from the input of AC electric power E_aTiming delays time T_PDuring, By monitoring value arrival time T_K(30ms) and operation voltage monitoring signal MV from H potential change be L current potential.As a result, when passing through Cross delay time T_PWhen checking operation voltage monitoring signal MV later, due to MV=" L ", enter circular treatment [B] (step S₁₀₃→S_104b→S₁₀₂→S_F→S₁₀₃→S_104b····).Then, as time point t hereafter_cThe input weight of AC electric power E When new beginning, since SW/AC monitoring signal MS becomes L current potential, enter circular treatment [A] (step S₁₀₂→S_104a→S₁₀₂ →), it remains in thereafter in circular treatment [A].

In addition, in the case of fig. 8, in the time point t stopped from the input of AC electric power E_aTiming delays time T_PPhase Between, in time point t_β, the input of AC electric power E restarts, although operation voltage monitoring signal MV from L potential change be H current potential (step S₁₀₃), but since SW/AC monitoring signal MS is L current potential, enter circular treatment [A] (step via circular treatment [F] Rapid S_G→S_104d→S₁₀₂), it remains in thereafter in circular treatment [A].

The movement electricity of multiple types is produced about the circuit around main control unit 36, such as operation voltage generative circuit 40 Pressure.In this case, operation voltage monitoring unit 48 can monitor one of the operation voltage of multiple type, and usually monitoring supplies To the voltage potential to 36 operation voltage of main control unit.In addition, external power supply 34 is not limited to single-phase commercial ac power source, it can To be the single-phase or three-phase alternating-current supply with optional frequency, it is also possible to DC power supply.Therefore, operation voltage generative circuit 40 Also it is not limited to single-phase ac-dc converter circuit, can be the ac-dc converter circuit of three-phase, or can be by Switching Power Supply Circuit and Nverter circuit etc. are constituted.Motor 30 is also not limited to single phase ac motor, can be arbitrary motor.In SW/AC In monitoring unit 46, although may make up high speed current detecting part by using photoelectrical coupler as embodiment described above, It can be used such as relay and replace photoelectrical coupler.

Electrodynamic type in above embodiment is an example of electric tool of the invention with grinding machine, present invention can be suitably applied to electricity Motor is used for the outer of power source by dynamic formula chamfering machine, disc type milling drum, disk grinder, stripping machine, cutting machine, punch etc. Any electric tool of portion's power supply mode.Also, controller for motor of the invention is not limited to electric tool, is applicable to horse Up to any electric appliance of the external power supply mode for power source.

Label declaration

1 electrodynamic type band grinding machine

22 switches

30 motors

32 controller for motor

34 AC power supplies

36 main control units

38 motor control circuits

40 operation voltage generative circuits

46 SW/AC monitoring units

48 operation voltage monitoring units

78 bidirectional thyristors

88 photoelectrical couplers