阅读说明：本技术 电机、电机的预保护控制方法及预保护系统 (Motor, motor pre-protection control method and pre-protection system ) 是由 占钟生 刘振邦 樊钊 金萌 于 2021-07-28 设计创作，主要内容包括：本发明公开了一种电机、电机的预保护控制方法及预保护系统,在电机开启之前断开所述电机的电源输入端与电机本体的接线端的连接；当接收到电机开启指令时,检测并判断电机的电源输入端的电源参数是否满足对应的预设条件；若不满足,则继续保持电机的电源输入端与电机本体的接线端的断开,并进行故障排除；若满足,则将电机的电源输入端与电机本体的接线端相连接；在电机运行过程中,监测电源输入端的电源参数是否满足对应的预设条件,当电源参数不满足对应的预设条件,则将电机的电源输入端与电机本体的接线端断开。与现有技术比较,本申请中阻止了电机在电源异常的时候仍然接电启动的情况,极大的降低了电动机接入异常电源而被烧毁的风险。(The invention discloses a motor, a pre-protection control method and a pre-protection system of the motor, wherein before the motor is started, the connection between a power supply input end of the motor and a wiring end of a motor body is disconnected; when a motor starting instruction is received, detecting and judging whether power supply parameters of a power supply input end of a motor meet corresponding preset conditions or not; if the current is not satisfied, continuing to keep the disconnection between the power input end of the motor and the wiring end of the motor body, and removing the fault; if so, connecting the power input end of the motor with the wiring end of the motor body; in the running process of the motor, whether the power supply parameters of the power supply input end meet corresponding preset conditions or not is monitored, and when the power supply parameters do not meet the corresponding preset conditions, the power supply input end of the motor is disconnected with the wiring end of the motor body. Compared with the prior art, the motor is prevented from still being electrified and started when the power supply is abnormal in the application, and the risk that the motor is burnt due to the fact that the motor is connected into the abnormal power supply is greatly reduced.)

1. A pre-protection control method of a motor is characterized by comprising the following steps:

before the motor is started, the connection between the power input end of the motor and the wiring end of the motor body is disconnected;

when a motor starting instruction is received, detecting and judging whether power supply parameters of a power supply input end of a motor meet corresponding preset conditions or not; if not, the disconnection between the power input end of the motor and the wiring end of the motor body is continuously kept.

2. The pre-protection control method of an electric machine according to claim 1, further comprising the steps of: and when the power supply parameters meet corresponding preset conditions, connecting the power supply input end of the motor with the wiring end of the motor body.

3. The motor pre-protection control method according to claim 1, wherein when the power supply parameter does not satisfy the corresponding preset condition, the disconnection between the power supply input end of the motor and the terminal of the motor body is continuously maintained, and meanwhile, fault removal is performed.

4. The motor pre-protection control method according to claim 1, wherein the power supply parameter meeting the corresponding preset condition comprises that the power supply at the power supply input end does not exceed at least one of a rated voltage preset range, a phase loss and a reverse phase of the motor.

5. The motor pre-protection control method according to claim 1, wherein in the motor operation process, whether the power supply parameter of the power supply input end meets the corresponding preset condition is monitored, and when the power supply parameter does not meet the corresponding preset condition, the power supply input end of the motor is disconnected from the terminal of the motor body.

6. The motor pre-protection control method according to claim 1, wherein when a motor start command is received, whether the motor wiring is normal or not is detected while detecting and judging whether the power supply parameter of the power supply input end of the motor meets the corresponding preset condition, and if not, the disconnection between the power supply input end of the motor and the wiring end of the motor body is maintained.

7. The motor pre-protection control method according to claim 6, wherein if the power supply parameter of the power supply input end meets the corresponding preset condition and the wiring of the motor is normal, the power supply input end of the motor is connected with the wiring terminal of the motor body.

8. A pre-protection system for an electric machine, comprising: the detection module is used for detecting power supply parameters of a power supply input end of the motor, the execution mechanism can control the power supply input end to move back and forth relative to a wiring end of the motor, and the control module is used for controlling whether the execution mechanism is connected with the power supply input end and the wiring end of the motor or not according to the detection result of the detection module.

9. The pre-protection system for an electric motor of claim 8, wherein said power input comprises a power terminal, said motor terminal comprises a motor terminal, and said actuator is coupled to said power terminal to control movement thereof.

10. The pre-protection system for an electric motor according to claim 9, wherein the power supply terminal and the outer side of the terminal of the motor terminal are covered with arc extinguishing means.

11. The pre-protection system of an electric machine of claim 8, further comprising a self-test module that detects whether the detection module is functioning properly.

12. An electric machine characterized in that it comprises a pre-protection system of an electric machine according to any one of claims 8 to 11.

Technical Field

The invention relates to the technical field of motor control, in particular to a motor, a motor pre-protection control method and a motor pre-protection system.

Background

With the continuous development of industrial technology, the application of a high-power low-voltage motor is more and more extensive, the rated current of the low-voltage motor can be kilo-ampere, and the winding of the low-voltage motor can be burnt out slightly carelessly under the condition of large current; in fact, the phenomenon of burning of the low-voltage motor is common, and various methods are needed in the industry to protect the low-voltage motor from being burnt, but the effect is very little. The phenomenon that the low-voltage motor is burnt out still happens occasionally, which not only causes the waste of a large amount of manpower, material resources and resources, but also brings about not little economic loss for enterprises. The direct reason for the burnout of the low-voltage motor is mainly that large current (exceeding several times of rated current or even larger current) can be generated under abnormal conditions such as phase loss, reverse phase, high and low voltage, and the like, and the insulation performance of a motor winding can be greatly influenced no matter the large current passes through instantaneously or in short time, so that the interphase short circuit of the low-voltage motor is caused, and finally the burnout of the low-voltage motor is caused. Therefore, how to effectively reduce the risk of burning out the motor due to abnormal current becomes a major research focus in the industry.

Disclosure of Invention

The invention provides a motor, a motor pre-protection control method and a motor pre-protection system, which solve the problems that in the prior art, a motor is easily influenced by large current and has a high risk of being burnt.

The technical scheme adopted by the invention is as follows: a pre-protection control method of a motor comprises the following steps: before the motor is started, the connection between the power input end of the motor and the wiring end of the motor body is disconnected; when a motor starting instruction is received, detecting and judging whether power supply parameters of a power supply input end of a motor meet corresponding preset conditions or not; if not, the disconnection between the power input end of the motor and the wiring end of the motor body is continuously kept.

Further, the method also comprises the following steps: and when the power supply parameters meet corresponding preset conditions, connecting the power supply input end of the motor with the wiring end of the motor body.

Further, when the power supply parameters do not meet the corresponding preset conditions, the disconnection between the power supply input end of the motor and the wiring end of the motor body is continuously kept, and meanwhile, the fault is eliminated.

Further, the condition that the power supply parameter meets the corresponding preset condition includes that the power supply at the power supply input end does not have at least one of a rated voltage preset range, a phase failure and a reverse phase exceeding the motor.

And further, in the running process of the motor, monitoring whether the power supply parameter of the power supply input end meets the corresponding preset condition, and disconnecting the power supply input end of the motor from the wiring end of the motor body when the power supply parameter does not meet the corresponding preset condition.

Further, when a motor starting instruction is received, whether the wiring of the motor is normal is detected while whether the power parameter of the power input end of the motor meets the corresponding preset condition is detected and judged, and if the wiring of the motor is abnormal, disconnection between the power input end of the motor and the wiring end of the motor body is kept.

And further, if the power supply parameters of the power supply input end meet corresponding preset conditions and the wiring of the motor is normal, connecting the power supply input end of the motor with the wiring end of the motor body.

A pre-protection system for an electric machine, comprising: the detection module is used for detecting power supply parameters of a power supply input end of the motor, the execution mechanism can control the power supply input end to move back and forth relative to a wiring end of the motor, and the control module is used for controlling whether the execution mechanism is connected with the power supply input end and the wiring end of the motor or not according to the detection result of the detection module.

Further, the power input end comprises a power terminal, the terminal of the motor comprises a motor terminal, and the actuating mechanism is connected with the power terminal to control the movement of the actuating mechanism.

Further, an arc extinguishing device is covered on the outer side of the wiring end of the power supply wiring terminal and the wiring end of the motor wiring terminal.

Further, the pre-protection system also comprises a self-checking module for detecting whether the detection module can work normally.

An electric machine comprising a pre-protection system for said electric machine.

Compared with the prior art, the power input end of the motor is disconnected with the wiring end of the motor body before the motor is started, when a motor starting instruction is received, the input power of the power input end is detected firstly, when the power parameter is detected to not meet the corresponding preset condition, the disconnection of the power input end of the motor and the wiring end of the motor body is continuously kept, the condition that the motor is still powered on and started when the power is abnormal is prevented through the advanced protection measure, and the risk that the motor is burnt out when the motor is connected into an abnormal power source is greatly reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic diagram of a connection structure between a motor and an input power supply according to the present invention;

fig. 2 is a schematic flow chart of a motor pre-protection control method according to the present invention.

1. An electric motor; 2. a motor wiring terminal; 3. a power supply wiring terminal; 4. an arc extinguishing device.

Detailed Description

The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.

The application discloses a motor, a motor pre-protection control method and a pre-protection system, wherein the main execution stage of the pre-protection control of the motor is located after an input power supply of the motor is electrified and before the motor is formally electrified to operate, namely after the input power supply of a motor 1 is switched on, the motor 1 needs to be detected by the pre-protection system, when whether a power supply parameter of the power supply input end of the motor (the motor 1) meets a corresponding preset condition is detected in the pre-protection stage, if the power supply parameter does not meet the preset condition, the input power supply is abnormal, the motor 1 cannot be in contact conduction with the input power supply at the moment, the motor 1 cannot be in forced operation under the condition of the abnormal input power supply, and only when the input power supply is detected to be normal, the motor 1 can be in contact conduction with the input power supply and formally operates.

Referring to fig. 1, the pre-protection system for an electric machine provided in the present application mainly includes: the detection module is used for detecting power supply parameters of the power supply input end; the actuating mechanism can control the power supply input end to move back and forth relative to the wiring end of the motor; and the control module controls whether the actuating mechanism is connected with the power input end and the wiring end of the motor or not according to the detection result of the detection module.

The actuating mechanism of the motor protection circuit is mainly used for driving the power supply wiring terminal 3 to move, the motor 1 comprises three motor wiring terminals 2, the corresponding input power supply also comprises three power supply wiring terminals 3, the end parts of the motor wiring terminals 2 and the power supply wiring terminals 3 are oppositely arranged, the end part of the motor wiring terminal 2 is a static contact, the end part of the power supply wiring terminal 3 is a movable contact, an interval is formed between the static contact and the movable contact under normal conditions, the static contact and the movable contact are not in contact with each other, and the movable contact and the static contact are not in contact with each other and conduct electricity before the pre-protection step of the motor 1; only when the pre-protection system of the motor monitors that the input power supply is normal, the controller in the pre-protection system of the motor can control the actuating mechanism to move, the actuating mechanism drives the moving contact of the power supply wiring terminal 3 to move towards the direction of the motor wiring terminal 2, and the moving contact and the motor wiring terminal are in contact conduction.

It should be noted that the present application is not limited to the actuator, and the structure of the actuator may be in various forms, for example: by adopting an electromagnetic attraction principle, when a coil of the motor binding post 2 is electrified, the coil current can generate a magnetic field, the generated magnetic field enables the static iron core to generate electromagnetic attraction to attract the movable iron core arranged on the power binding post 3 and drive the power binding post 3 and the motor binding post 2 to move relatively and be attracted together; when the coil is powered off, the electromagnetic attraction disappears, and the power supply wiring terminal 3 is released under the action of the release spring, so that the power supply wiring terminal 3 is restored.

Further, still cover in the outside of motor terminal 2 and power terminal 3 and be equipped with arc control device 4, produce electric arc because the heavy current and burn the loss to the contact, arc control device 4 can effectively restrict the expansion space of electric arc, takes the enhancement arc extinguishing measure, has greatly ensured motor 1's operation safety.

This application has avoided traditional motor 1 to get electricity the operation mode promptly, the protection system in advance of motor has just also avoided when the electric current is unusual the response time that this section of motor 1 is in the state of getting electricity always to the feedback from beginning to detecting fault information when the electric current is unusual, make motor 1 also can not insert unusual power once more when the power is unusual, reduced under long-term electric current strikes, motor 1 is punctured, the risk of burning out, very big guarantee motor 1's safe operation, still protected motor 1's life.

Referring to fig. 2, the pre-protection control method in the present application mainly includes the following steps:

step S10, when the control is started, the input power supply is normally switched on, the preparation work of the motor is finished, the connection between the power supply input end of the motor and the wiring end of the motor body is disconnected before the motor is started, and the input power supply is waited to be switched on to operate;

step S20, electrifying a self-checking module of the motor pre-protection system to detect whether the pre-protection system can work normally, and mainly detecting the detection module of the protection system;

step S30: the motor pre-protection system detects whether power supply parameters of a power supply input end of a motor meet corresponding preset conditions;

step S40: in this step, the condition that the power parameter satisfies the corresponding preset condition includes that the power at the power input end does not exceed at least one of the preset range of the rated voltage, the phase loss and the phase reversal of the motor, that is, when the power at the power input end exceeds at least one of the preset range of the rated voltage, the phase loss and the phase reversal of the motor, the corresponding preset condition is not satisfied; wherein, the preset range of the rated voltage is generally within +/-10% of the rated voltage;

step S51: if the power supply parameters do not meet the corresponding preset conditions, namely the input power supply is abnormal, the pre-protection system of the motor does not output an action signal for enabling the motor 1 and the input power supply to be in contact conduction;

step S61: the wiring terminal of the input power supply and the wiring terminal of the motor 1 body are kept in a disconnected state, a gap exists between the wiring terminal of the input power supply and the wiring terminal of the motor 1 body, and the motor 1 cannot be electrified to run;

step S71: when the power supply parameters do not meet corresponding preset conditions and the input power supply is abnormal, the input power supply is required to be cut off to eliminate the fault of the front-end circuit of the motor 1, the input power supply is restarted after the fault of the front-end circuit is manually eliminated according to the detected problem of the pre-protection system, and the step S20 is executed again;

step S52: if the power supply parameters meet corresponding preset conditions, namely when the front-end circuit has no fault, the pre-protection system of the motor outputs an action signal for enabling the motor 1 and the input power supply to be in contact conduction;

step S62: the actuating mechanism receives the action signal, controls the binding post of the input power supply and the binding post of the motor 1 body to move to a contact conduction state, and the motor 1 is electrified to operate;

step S72: the motor is normally started to operate;

step S80: and after the motor is normally started and operated, the control of the pre-protection system is finished.

The pre-protection system of the motor detects whether the input power supply is normal or not, generally, the phase fault and phase fault of the three-phase power supply is detected independently through a three-phase power supply phase sequence vector method, a three-phase power supply phase fault and phase fault detection circuit or a single chip microcomputer plus programming and other external structures, and certainly, the detection can be completed through a detection circuit built in a front-end circuit.

Further, the motor pre-protection system comprises the pre-protection steps, and can still monitor the circuit condition in real time after the motor and the input power supply are normally contacted and electrified, namely the motor 1 is normally started to operate, when the three-phase power supply is abnormal, the motor pre-protection system can timely control the power supply wiring terminal 3 and the motor wiring terminal 2 to move to a disconnected state, and the motor 1 stops operating.

Further, the motor pre-protection system in this application still includes a detection device that detects whether motor wiring is normal, and detection device's main effect lies in: when a motor starting instruction is received, whether power supply parameters of a power supply input end of the motor meet corresponding preset conditions or not is detected and judged, and meanwhile, whether the wiring of the motor is normal or not is detected through the detection device, when the detection device detects that the wiring of the motor 1 is normal, the motor 1 can be normally started, so that circuit abnormity caused by wiring errors can be further eliminated, and the safety of the motor 1 is protected.

The above specific embodiments are only intended to illustrate the inventive concept and many modifications and variations may be made by those skilled in the art within the spirit of the invention, which are included within the scope of the invention.