阅读说明：本技术 马达停转保护系统及其保护控制方法 (Motor stall protection system and protection control method thereof ) 是由 洪银树 邱智翔 王嘉暐 于 2019-10-18 设计创作，主要内容包括：本发明公开了一种马达停转保护系统及其保护控制方法,用以解决现有马达停转导致转动结构及驱动回路损坏的问题。该马达停转保护系统包括：一个电源；一个驱动电路,该驱动电路电性连接该电源；一个马达,该马达电性连接该驱动电路；一个第一感测模组,该第一感测模组设于该电源；一个第二感测模组,该第二感测模组设于该马达；及一个处理单元,该处理单元分别耦合连接该驱动电路、该第一感测模组及该第二感测模组,该处理单元由该第一感测模组及该第二感测模组产生一个监测结果,并依据该监测结果控制该驱动电路调整该马达运转。(The invention discloses a motor stall protection system and a protection control method thereof, which are used for solving the problem that a rotating structure and a driving loop are damaged due to the stall of the existing motor. The motor stall protection system includes: a power source; the driving circuit is electrically connected with the power supply; a motor electrically connected to the driving circuit; the first sensing module is arranged on the power supply; the second sensing module is arranged on the motor; and the processing unit is respectively coupled with the driving circuit, the first sensing module and the second sensing module, generates a monitoring result by the first sensing module and the second sensing module, and controls the driving circuit to adjust the motor to operate according to the monitoring result.)

1. A motor stall protection system, comprising:

a power source;

the driving circuit is electrically connected with the power supply and generates a control signal;

the motor is electrically connected with the driving circuit and operates according to the control signal;

the first sensing module is arranged on the power supply and measures and generates a first feedback signal;

the second sensing module is arranged on the motor and measures and generates a second feedback signal; and

the processing unit is respectively coupled with the driving circuit, the first sensing module and the second sensing module, generates a monitoring result by the first feedback signal and the second feedback signal, and controls the driving circuit to adjust the control signal according to the monitoring result.

2. The system of claim 1, wherein the first feedback signal comprises a supply voltage value, a supply current value, or a supply temperature.

3. The system of claim 1, wherein the second feedback signal comprises a motor voltage value, a motor current value, a motor speed, or a motor temperature.

4. The system of claim 1, further comprising a third sensing module disposed in the driving circuit, the third sensing module measuring and generating a third feedback signal, the processing unit adjusting the monitoring result according to the third feedback signal.

5. The system of claim 4, wherein the third feedback signal comprises a driving current value, a driving voltage value or a driving circuit temperature.

6. The motor stall protection system of claim 1 or 4, wherein the processing unit is a microcontroller or an application specific integrated circuit.

7. The system of claim 1 or 4, wherein the driving circuit and the processing unit are ASIC circuits.

8. The system as claimed in claim 1 or 4, wherein when the processing unit generates the monitoring result as a normal driving, the processing unit controls the driving circuit to adjust the control signal to drive the motor to operate.

9. The system as claimed in claim 1 or 4, wherein when the monitoring result generated by the processing unit is abnormal, the processing unit controls the driving circuit to adjust the control signal to reduce the output power to the motor.

10. The system of claim 9, wherein the processing unit controls the driving circuit to adjust the control signal to stop outputting power to the motor when the monitoring result generated by the processing unit is lower than a safe rotation speed.

11. The motor stall protection system of claim 9, wherein the monitoring result is at least one of an over-voltage, an over-current, a low-voltage, an over-temperature, an over-power, a micro-electronic fault, a locked-rotor, a step-out, and an under-phase, and the monitoring result is a judgment anomaly.

12. A motor stall protection control method having the motor stall protection system of any one of claims 1 to 3, characterized by comprising:

a running stage, the driving circuit adjusts the control signal to drive the motor to run, and determines whether the first feedback signal and the second feedback signal are abnormal, if the determination result is no, the running stage is maintained;

a speed reduction stage, if the judgment result is abnormal, the drive circuit adjusts the control signal to reduce the output power of the motor, continuously judges whether the rotating speed of the motor is lower than a safe rotating speed, if not, the speed reduction stage is repeated; and

and a stopping stage, wherein if the rotation speed of the motor is lower than the safe rotation speed, the driving circuit adjusts the control signal to stop outputting power to the motor, and continuously judges whether the first feedback signal and the second feedback signal are abnormal, if so, the stopping stage is maintained, and if not, the motor is restarted to return to the operating stage.

13. A motor stall protection control method having the motor stall protection system of claim 4 or 5, characterized by comprising:

a running stage, in which the driving circuit adjusts the control signal to drive the motor to run, and determines whether the first feedback signal, the second feedback signal and the third feedback signal are abnormal, if the determination result is negative, the running stage is maintained;

a speed reduction stage, if the judgment result is abnormal, the drive circuit adjusts the control signal to reduce the output power of the motor, continuously judges whether the rotating speed of the motor is lower than a safe rotating speed, if not, the speed reduction stage is repeated; and

and a stopping stage, wherein if the rotation speed of the motor is lower than the safe rotation speed, the driving circuit adjusts the control signal to stop outputting power to the motor, and continues to judge whether the first feedback signal, the second feedback signal and the third feedback signal are abnormal, if the judgment result is yes, the stopping stage is maintained, and if the judgment result is no, the motor is restarted to run, and the operation stage is returned.

Technical Field

The present invention relates to a motor protection method, and more particularly, to a motor stall protection system and a protection control method thereof for preventing damage caused by reaction force and pulse surge.

Background

Generally, the motor achieves the effect of stopping rotation by stopping supplying driving force, but if the motor loses power instantaneously in the operation process, a reaction force is generated to impact a rotating component of the motor, even a fan blade structure driven by the motor is damaged, in addition, because the stopping causes a driving loop of the motor to cut off current instantaneously, a transient Surge (Surge) pulse is generated in a circuit system of the motor, the amplitude of the Surge is tens of hundreds times of the normal amplitude and is far higher than the voltage which can be born by a common electronic element, and a coil winding and the driving loop of the motor are damaged by the Surge impact.

Particularly, a motor for driving a High Volume Low Speed (HVLS) ceiling fan needs to provide more driving force and use more driving current due to the large Volume and rotational inertia of the fan blades, and accordingly, the reaction force impact and pulse damage caused by the motor stalling can cause more serious damage.

The existing motor device improves the strength of a rotating structure and installs a protection element in a loop, such as: the additional devices such as fuses, arresters, or filters protect the motor, which may increase the manufacturing cost of the product and may reduce the operating efficiency of the motor by consuming part of the driving force due to the increased structural weight and circuit complexity of the motor.

Accordingly, there is a need for improved motor stall protection systems and methods.

Disclosure of Invention

To solve the above problems, an object of the present invention is to provide a motor stall protection system and a protection control method thereof, which can reduce the manufacturing cost and improve the operation efficiency without installing an additional reinforcing structure or a protection element.

Another objective of the present invention is to provide a motor stall protection system and a protection control method thereof, which can improve the reliability and service life of the motor operation structure and the driving circuit.

Still another object of the present invention is to provide a motor stall protection system and a protection control method thereof, which can accurately determine whether a motor system is operating normally, and automatically stall and restart the motor system.

The use of the terms a or an for elements and components described throughout this disclosure are for convenience only and provide a general sense of the scope of the invention; in the present invention, it is to be understood that the singular includes plural unless it is obvious that it is meant otherwise.

The motor stall protection system of the present invention includes: a power source; the driving circuit is electrically connected with the power supply and generates a control signal; the motor is electrically connected with the driving circuit and operates according to the control signal; the first sensing module is arranged on the power supply and measures and generates a first feedback signal; the second sensing module is arranged on the motor and measures and generates a second feedback signal; and the processing unit is respectively coupled with the driving circuit, the first sensing module and the second sensing module, generates a monitoring result by the first feedback signal and the second feedback signal, and controls the driving circuit to adjust the control signal according to the monitoring result.

The invention discloses a motor stall protection control method, which comprises the following steps: a running stage, the driving circuit adjusts the control signal to drive the motor to run, and determines whether the first feedback signal and the second feedback signal are abnormal, if the determination result is no, the running stage is maintained; a speed reduction stage, if the judgment result is abnormal, the drive circuit adjusts the control signal to reduce the output power of the motor, continuously judges whether the rotating speed of the motor is lower than a safe rotating speed, if not, the speed reduction stage is repeated; and a stopping stage, if the rotating speed of the motor is lower than the safe rotating speed, the driving circuit adjusts the control signal to stop outputting power to the motor, continuously judges whether the first feedback signal and the second feedback signal are abnormal, if the judging result is yes, the stopping stage is maintained, if the judging result is no, the motor is restarted to operate, and the operation stage is returned.

Therefore, the motor stalling protection system and the protection control method thereof can judge whether the motor is abnormal or not by monitoring the working conditions of the power supply and the motor, gradually stall the motor by reducing the rotating speed, restart the motor to operate after the abnormal condition is eliminated, avoid the damage of the motor operating structure or the driving circuit caused by the sudden condition or the instant stop of the motor in the operating process, do not need to install additional protection elements, and have the effects of prolonging the service life, reducing the manufacturing cost, improving the operating efficiency and the like.

The first feedback signal comprises a power supply voltage value, a power supply current value or a power supply temperature. Therefore, the power supply state of the power supply can be monitored.

Wherein, the second feedback signal includes a motor voltage value, a motor current value, a motor speed or a motor temperature. Therefore, the motor running state monitoring device has the effect of monitoring the running state of the motor.

The invention also comprises a third sensing module, the third sensing module is arranged on the driving circuit, the third sensing module measures and generates a third feedback signal, and the processing unit adjusts the monitoring result according to the third feedback signal. Therefore, the data information analyzed by the processing unit can be increased, and the effect of improving the accuracy of the monitoring result is achieved.

Wherein, the third feedback signal comprises a driving current value, a driving voltage value or a driving circuit temperature. Therefore, the method has the effect of monitoring the process of adjusting the control signal by the driving circuit.

Wherein the processing unit is a microcontroller or an application specific integrated circuit. Therefore, the input/output interface and the operation processing function can be integrated, and the effects of reducing the number of elements and occupying space are achieved.

The driving circuit and the processing unit are application specific integrated circuits. Therefore, the integrated control system has the effects of integrating the control function and saving the installation space.

When the processing unit generates the monitoring result that the driving is normal, the processing unit controls the driving circuit to adjust the control signal to drive the motor to operate. Therefore, the motor has the effect of maintaining or restarting the normal operation of the motor.

When the processing unit generates the monitoring result to be abnormal, the processing unit controls the driving circuit to adjust the control signal to reduce the output power of the motor. Therefore, the rotating speed of the motor can be reduced when the motor cannot normally operate, and the effect of avoiding damage to the motor structure or a loop is achieved.

The monitoring result comprises at least one of overvoltage, overcurrent, low voltage, overtemperature, overpower, microelectronic fault, locked rotor, step loss and phase loss, and the monitoring result is abnormal judgment. Therefore, the method has the effect of judging that the motor cannot normally operate.

When the monitoring result generated by the processing unit is lower than the safe rotating speed, the processing unit controls the driving circuit to adjust the control signal to stop outputting power to the motor. Therefore, the motor can be stopped in a state of low impact, and the motor structure and the circuit damage can be reduced.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1: the system block diagram of the preferred embodiment of the present invention;

FIG. 2: a method flow diagram of a preferred embodiment of the invention.

Description of the reference numerals

1 Power supply

2 drive circuit

3 Motor

4 first sensing module

5 second sensing module

6 processing unit

7 third sensing module

C control signal

F1 first feedback signal

F2 second feedback signal

F3 third feedback signal

S1 operation stage

S2 deceleration phase

S3 stop phase.

Detailed Description

In order to make the aforementioned and other objects, features and advantages of the invention more comprehensible, preferred embodiments accompanied with figures are described in detail below:

referring to fig. 1, a preferred embodiment of a motor stall protection system according to the present invention includes a power supply 1, a driving circuit 2, a motor 3, a first sensing module 4, a second sensing module 5, and a processing unit 6, wherein the driving circuit 2 is electrically connected to the power supply 1 and the motor 3, the first sensing module 4 is disposed on the power supply 1, the second sensing module 5 is disposed on the motor 3, and the processing unit 6 is coupled to the driving circuit 2, the first sensing module 4, and the second sensing module 5.

The power source 1 supplies power to the driving circuit 2, the driving circuit 2 generates a control signal C, and the motor 3 is operated according to the control signal C, so that the rotating speed of the motor 3 can be switched by adjusting the voltage or duty ratio of the control signal C, and the voltage or duty ratio can be increased or decreased with time to accelerate or decelerate and stop the motor 3.

The first sensing module 4 may have a voltage sensor, a current sensor or a temperature sensing element, and is configured to measure the power supply voltage, the power supply current or the power supply temperature of the power supply 1 and collect all the data into a first feedback signal F1.

The second sensing module 5 may have a voltage sensor, a current sensor, a hall element or a temperature sensing element, and is used for measuring the working data of the motor 3, such as the motor voltage, the motor current, the motor speed or the motor temperature, and integrating all the data into a second feedback signal F2.

The processing Unit 6 can be a Micro Control Unit (MCU) or an Application Specific Integrated Circuit (ASIC), the processing Unit 6 analyzes and calculates data included in the first feedback signal F1 and the second feedback signal F2, and generates a monitoring result, and the processing Unit 6 controls the driving Circuit 2 to adjust the Control signal C according to the monitoring result. In addition, the processing unit 6 can also integrate the driving circuit 2 into the same set of asic.

In addition, the motor stall protection system of the present invention may further include a third sensing module 7, the third sensing module 7 is coupled to the processing unit 6, the third sensing module 7 may include a voltage sensor, a current sensor, or a temperature sensing element, and the like, for measuring working data of the driving circuit 2, such as a driving current value, a driving voltage value, or a driving circuit temperature, and integrating all the data into a third feedback signal F3, so that the processing unit 6 may generate the monitoring result according to data of the first feedback signal F1, the second feedback signal F2, and the third feedback signal F3.

According to the above structure, the motor 3 is driven by the control signal C of the driving circuit 2, and the power supply condition of the power supply 1 affects the control signal C and the operation condition of the motor 3, so that the power supply condition of the power supply 1 is monitored by the first sensing module 4, the operation condition of the motor 3 is monitored by the second sensing module 5, and the adjustment change of the control signal C of the driving circuit 2 is monitored by the third sensing module 7, and the above conditions are analyzed and judged by the processing unit 6 to generate the monitoring result.

When the monitoring result shows that the power supply 1, the driving circuit 2 and the motor 3 are all operating normally, the processing unit 6 controls the driving circuit 2 to adjust the control signal C and drives the motor 3 to maintain operation.

When the monitoring result shows that at least one of the conditions of overvoltage, overcurrent, low voltage, overtemperature, overpower, microelectronic fault, rotation blockage, step loss, underphase and the like occur to the power supply 1, the driving circuit 2 and the motor 3, the monitoring result is abnormal judgment, and the processing unit 6 controls the driving circuit 2 to adjust the control signal C so as to reduce the output power of the motor 3 and reduce the rotating speed of the motor 3. In addition, the method for reducing the output power may be a linear decreasing method, an exponential decreasing method, a table look-up method, or other processes in which the output trend is decreasing, and the invention is not limited thereto.

When the monitoring result shows that the rotation speed of the motor 3 is lower than a safe rotation speed, the processing unit 6 controls the driving circuit 2 to adjust the control signal C to stop outputting power to the motor 3, so that the motor 3 stops operating.

Referring to fig. 2, it is a flowchart of a motor stall protection control method according to a preferred embodiment of the present invention, including an operation stage S1, a speed reduction stage S2 and a stop stage S3.

The operation stage S1 is to adjust the control signal C by the driving circuit 2, so that the motor 3 operates according to the control signal C, and the first sensing module 4 measures the power supply 1 to obtain the first feedback signal F1, and the second sensing module 5 measures the motor 3 to obtain the second feedback signal F2, determine whether the first feedback signal F1 and the second feedback signal F2 are abnormal, if the determination result is no, maintain the operation stage S1.

If the determination result is yes, i.e. an abnormality occurs, the method enters the speed reduction stage S2, the driving circuit 2 adjusts the control signal C to reduce the output power to the motor 3, and continuously determines whether the rotation speed of the motor 3 is lower than a safe rotation speed, if the determination result is no, the speed reduction stage S2 is repeated.

If the determination result is yes, that is, the rotation speed of the motor 3 is lower than the safe rotation speed, the method enters the stop stage S3, the driving circuit 2 adjusts the control signal C to stop outputting power to the motor 3, and continues to determine whether the first feedback signal F1 and the second feedback signal F2 are abnormal, if the determination result is yes, the stop stage S3 is maintained, if the determination result is no, the motor 3 is restarted, and the operation returns to the operation stage S1.

In addition, the third sensing module 7 can measure the driving circuit 2 to obtain the third feedback signal F3, and when determining whether the first feedback signal F1 and the second feedback signal F2 are abnormal, the third feedback signal F3 is also determined.

In summary, the motor stall protection system and the protection control method thereof of the present invention can determine whether the motor is abnormally operated by monitoring the power supply, the driving circuit and the working condition of the motor, can immediately find the power supply abnormality in the unstable environment of the power system, gradually stall the motor by reducing the rotation speed, and restart the motor to operate after the abnormal condition is eliminated, so as to prevent the motor from being damaged in the operation structure or driving circuit due to the sudden or instantaneous stop of the motor in the operation process, especially to prevent the motor from being damaged due to the stall of the large ceiling fan, and do not need to install an additional protection element on the motor, thereby having the effects of prolonging the service life, reducing the manufacturing cost, improving the operation efficiency, etc.

Although the present invention has been disclosed with reference to the above preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.