Circuit and method for controlling isolating switch motor

文档序号：229837 发布日期：2021-11-09 浏览：31次中文

阅读说明：本技术 一种隔离开关电机控制电路及方法 (Circuit and method for controlling isolating switch motor ) 是由王晓明林翔宇李文伟周柯苏毅宋益覃剑芦宇峰彭博雅于 2021-07-29 设计创作，主要内容包括：本发明提供了一种隔离开关电机控制电路及方法,所述控制电路包括CPU组件,继电器组件和电机电流检测组件。所述CPU组件控制所述继电器组件,改变所述继电器组件在所述控制电路的开合状态,所述电机电流检测组件实时监测经过所述继电器组件的电流数据并输出给所述CPU组件。所述电机控制方法,应用于所述控制电路,通过所述CPU组件控制所述继电器组件实现对电机的正转或反转或停止的操作,所述CPU组件根据所述电机电流监测组件监测到的电流数据,确保所述继电器组件在电流安全阈值内切断电路。所述隔离开关控制电路体积小,设置简单方便,能够实时监测电流,安全性好。(The invention provides an isolating switch motor control circuit and a method. The CPU component controls the relay component, the opening and closing state of the relay component in the control circuit is changed, and the motor current detection component monitors current data passing through the relay component in real time and outputs the current data to the CPU component. The motor control method is applied to the control circuit, the CPU component controls the relay component to realize the forward rotation or reverse rotation or stop operation of the motor, and the CPU component ensures that the relay component cuts off the circuit within a current safety threshold according to the current data monitored by the motor current monitoring component. The isolating switch control circuit is small in size, simple and convenient to set, capable of monitoring current in real time and good in safety.)

1. An isolating switch motor control circuit is characterized in that the control circuit comprises a CPU component, a relay component and a motor current detection component;

the CPU component is connected with the relay component and is used for controlling the relay component; the CPU component is connected with the motor current detection component and used for receiving current data monitored by the motor current detection component;

the relay assembly includes a normally open relay element and a relay drive element; the relay driving element drives the normally open relay element to change the opening and closing state in the circuit based on the control instruction of the CPU component;

the motor current detection assembly is used for monitoring current data passing through the relay assembly and feeding the monitored current data back to the CPU assembly.

2. The isolated switch motor control circuit of claim 1,

the CPU component comprises a CPU module and an ADC module;

the CPU module is connected with the relay driving element and controls the relay driving element to execute operation;

the ADC module is connected with the motor current detection assembly and receives current monitoring data of the motor current detection assembly.

3. The disconnecting switch motor control circuit according to claim 1, wherein said normally open relay comprises a first relay, a second relay, a third relay, a fourth relay and a fifth relay;

the negative pole of the coil of the first relay is connected with the relay driving element, and the positive pole of the coil of the first relay is connected with the control power supply of the relay assembly;

the negative pole of the coil of the second relay is connected with the relay driving element, and the positive pole of the coil of the second relay is connected with the control power supply of the relay assembly;

the negative pole of the coil of the third relay is connected with the relay driving element, and the positive pole of the coil of the third relay is connected with the control power supply of the relay assembly;

the negative pole of the coil of the fourth relay is connected with the relay driving element, and the positive pole of the coil of the fourth relay is connected with the control power supply of the relay assembly;

and the negative pole of the coil of the fifth relay is connected with the relay driving element, and the positive pole of the coil of the fifth relay is connected with the control power supply of the relay assembly.

4. The disconnecting switch motor control circuit according to claim 3, wherein one end of the first relay is connected to an A phase of an alternating current power supply, and the other end of the first relay is connected to a U phase of the motor;

one end of the second relay is connected with the phase B of the alternating current power supply, and the other end of the second relay is connected with the phase V of the motor;

one end of the third relay is connected with the C phase of the alternating current power supply, and the other end of the third relay is connected with the W phase of the motor;

one end of the fourth relay is connected with the phase A of the alternating current power supply, and the other end of the fourth relay is connected with the phase W of the motor;

one end of the fifth relay is connected to the C phase of the alternating current power supply, and the other end of the fifth relay is connected to the U phase of the motor.

5. The disconnecting switch motor control circuit according to claim 3, wherein the fourth relay is connected to the circuit of the first relay in a parallel manner;

and the fifth relay is connected to a circuit where the third relay is located based on a parallel connection mode.

6. The isolated switch motor control circuit of claim 1 wherein said motor current sensing assembly includes a first current sensing element, a second current sensing element and a third current sensing element, said motor current sensing assembly monitoring the magnitude of current through said relay assembly, comprising:

one end of the first current detection element is connected with an A phase of an alternating current power supply, and the other end of the first current detection element is connected with the first relay and the fourth relay;

one end of the second current detection element is connected to the phase B of the alternating current power supply, and the other end of the second current detection element is connected to the second relay;

one end of the third current detection element is connected to the C phase of the alternating current power supply, and the other end of the third current detection element is connected to the third relay and the fifth relay.

7. A method for controlling a motor, wherein the method controls the forward rotation or reverse rotation or stop of the motor by the motor control circuit of the disconnecting switch according to any one of claims 1 to 6.

8. The motor control method according to claim 7, wherein the motor control method implements forward rotation control of the motor according to the isolation switch motor control circuit, and includes:

under the motor stop state, the CPU assembly receives a forward rotation instruction and controls the relay driving element based on the forward rotation instruction;

the relay driving element drives the first relay based on the CPU assembly, normally open contacts of a second relay and a third relay are closed, and normally open contacts of a fourth relay and a fifth relay are kept in an open state;

the phase A of the alternating current power supply is connected with the phase U of the motor, the phase B of the alternating current power supply is connected with the phase V of the motor, the phase C of the alternating current power supply is connected with the phase W of the motor, and the motor starts to rotate forwards.

9. The motor control method of the disconnecting switch according to claim 7, wherein the motor control method realizes reverse rotation control of the motor according to the motor control circuit of the disconnecting switch, and comprises the following steps:

under the motor stop state, the CPU assembly receives a reverse rotation instruction and controls the relay driving element based on the reverse rotation instruction;

the relay driving element drives the second relay based on the CPU assembly, normally open contacts of a fourth relay and a fifth relay are closed, and the normally open contacts of the first relay and the third relay are kept in an open state;

the phase A of the alternating current power supply is connected with the phase W of the motor, the phase B of the alternating current power supply is connected with the phase V of the motor, the phase C of the alternating current power supply is connected with the phase U of the motor, and the motor starts to rotate reversely.

10. The motor control method of the disconnecting switch according to claim 7, wherein the motor control method realizes stop control of the motor according to the motor control circuit of the disconnecting switch, and comprises the following steps:

when the motor rotates forwards or reversely, the CPU assembly receives a stop instruction, receives current monitoring data transmitted by the motor current detection assembly, and controls the relay assembly to disconnect the relay when the current monitoring data is smaller than a set threshold value, so that the motor starts to stop.

Technical Field

The invention relates to the field of alternating current motor control, in particular to a circuit and a method for controlling an isolating switch motor.

Background

In order to ensure the safety of maintenance personnel when the power grid is overhauled, the transformer substation widely applies an isolation disconnecting link with an obvious fracture to definitely disconnect a live line. The isolation switch mechanism box uses a three-phase alternating current motor driving mechanism to realize remote electric operation. At present, an alternating current motor in an isolation switch mechanism box is generally controlled by an alternating current contactor or a thyristor. The AC contactor has high price and larger volume; the thyristor control circuit has poor tolerance to over-current, over-voltage and other working conditions, and extra devices are needed to protect the thyristor in power application.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a circuit and a method for controlling an isolating switch motor.

The control circuit comprises a CPU component, a relay component and a motor current detection component;

the CPU component comprises a CPU module and an ADC module;

the CPU module is connected with the relay driving element and controls the relay driving element to execute operation;

the ADC module is connected with the motor current detection assembly and receives current monitoring data of the motor current detection assembly.

The relay assembly includes a normally open relay element and a relay drive element; the relay driving element drives the normally open relay element to change the opening and closing state in the circuit based on the control instruction of the CPU component;

the normally open relay comprises a first relay, a second relay, a third relay, a fourth relay and a fifth relay;

One end of the first relay is connected with an A phase of an alternating current power supply, and the other end of the first relay is connected with a U phase of the motor;

one end of the second relay is connected with the phase B of the alternating current power supply, and the other end of the second relay is connected with the phase V of the motor;

one end of the third relay is connected with the C phase of the alternating current power supply, and the other end of the third relay is connected with the W phase of the motor;

one end of the fourth relay is connected with the phase A of the alternating current power supply, and the other end of the fourth relay is connected with the phase W of the motor;

one end of the fifth relay is connected to the C phase of the alternating current power supply, and the other end of the fifth relay is connected to the U phase of the motor.

The fourth relay is connected to a circuit where the first relay is located based on a parallel connection mode;

and the fifth relay is connected to a circuit where the third relay is located based on a parallel connection mode.

The motor current detection assembly is used for monitoring current data passing through the relay assembly and feeding the monitored current data back to the CPU assembly.

The motor current detection assembly comprises a first current detection element, a second current detection element and a third current detection element, the motor current detection assembly monitors the current passing through the relay assembly, and the motor current detection assembly comprises:

A motor control method for realizing the control of the forward rotation or the reverse rotation or the stop of a motor according to an isolation switch motor control circuit comprises the following steps:

under the motor stop state, the CPU assembly receives a forward rotation instruction and controls the relay driving element based on the forward rotation instruction;

Under the motor stop state, the CPU assembly receives a reverse rotation instruction and controls the relay driving element based on the reverse rotation instruction;

And when the current data is smaller than a set threshold value, the CPU component controls the relay component to cut off the relay, and the motor starts to stop.

The invention provides an isolating switch motor control circuit and a method, wherein a three-phase motor is directly controlled through a relay assembly, the relay assembly is provided with an onboard relay, the size is small, the acquisition cost is low, and the high overvoltage and overcurrent impact can be resisted, the control circuit is provided with a motor current detection assembly, has a current detection function, can detect the current of the motor during operation in real time, can stop the motor from rotating within a safe current threshold value, and improves the safety of the control circuit.

Drawings

FIG. 1 is a component connection diagram of an isolator motor control circuit according to an embodiment of the present invention;

fig. 2 is a circuit wiring diagram of the motor control circuit of the disconnecting switch according to the embodiment of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1, the motor control circuit of the isolating switch comprises a CPU component 1, a relay component 2 and a motor current detection component 3;

the CPU component 1 is connected with the relay component 2 and is used for controlling the relay component.

Specifically, the CPU component 1 receives a user instruction, and the CPU component 1 controls the relay component 2 according to the instruction; the relay assembly 2 includes a relay driving element 21 and a normally open relay element 22, and the relay driving element 21 changes an open/close state in the control circuit based on the CPU assembly 2 driving the relay element 22.

The CPU component 1 is connected with the motor current detection component 3.

Specifically, the motor current detection assembly 3 is arranged in the control circuit, monitors current data passing through the relay assembly 2 in real time, and feeds the monitored current data back to the CPU assembly 1.

The isolating switch motor control circuit controls the relay assembly 2 to change the state on the control circuit through the CPU assembly 1, and the motor current detection assembly 3 is adopted to monitor the current data on the control circuit in real time. The control circuit is applied to a circuit where a three-phase alternating current motor in an isolation switch mechanism box is located, the motor is controlled through a small onboard relay, current data of the control circuit can be monitored in real time, and the use safety of the circuit is ensured.

Example two:

fig. 2 is a circuit wiring diagram of the motor control circuit of the disconnecting switch according to the embodiment of the invention.

Specifically, the CPU component 1 includes a CPU module 11 and an ADC module 12;

the CPU module 11 is connected with the relay driving element 21, and the CPU module 11 controls the relay driving element 21 to execute operation based on a user instruction;

the ADC module 12 is connected to the motor current detection module 3, and receives current monitoring data of the motor current detection module 3.

Specifically, the normally open relay 22 includes a first relay 221, a second relay 222, a third relay 223, a fourth relay 224 and a fifth relay 225;

the negative pole of the coil of the first relay 221 is connected with the relay driving element 21, and the positive pole of the coil of the first relay 221 is connected with the control power supply of the relay assembly 2;

the negative pole of the coil of the second relay 222 is connected with the relay driving element 21, and the positive pole of the coil of the second relay 222 is connected with the control power supply of the relay assembly 2;

the negative pole of the coil of the third relay 223 is connected with the relay driving element 21, and the positive pole of the coil of the third relay 223 is connected with the control power supply of the relay assembly 2;

the negative coil pole of the fourth relay 224 is connected with the relay driving element 21, and the positive coil pole of the fourth relay 224 is connected with the control power supply of the relay assembly 2;

the negative coil of the fifth relay 225 is connected to the relay driving element 21, and the positive coil of the fifth relay 225 is connected to the control power supply of the relay assembly 2.

Specifically, the first relay 221, the second relay 222, the third relay 223, the fourth relay 224 and the fifth relay 225 are connected in parallel to the control circuit of the relay assembly 2, and the relay driving element 21 can drive the first relay 221, the second relay 222, the third relay 223, the fourth relay 224 and the fifth relay 225 to change the opening and closing states in the control circuit of the disconnecting switch motor.

Specifically, one end of the first relay 221 is connected to a phase a of the ac power supply 5, and the other end of the first relay 221 is connected to a phase U of the motor 4;

one end of the second relay 222 is connected to the phase B of the ac power supply 5, and the other end of the second relay 222 is connected to the phase V of the motor 4;

one end of the third relay 223 is connected to the phase C of the alternating current power supply 5, and the other end of the third relay 223 is connected to the phase W of the motor 4;

one end of the fourth relay 224 is connected to the phase a of the ac power supply 5, and the other end of the fourth relay 224 is connected to the phase W of the motor 4;

one end of the fifth relay 225 is connected to the C phase of the ac power supply 5, and the other end of the fifth relay 225 is connected to the U phase of the motor 4.

The fourth relay 224 is connected to the circuit where the first relay 221 is located based on a parallel connection mode;

the fifth relay 225 is connected to the circuit where the third relay 223 is located in a parallel manner.

Specifically, when the first relay 221, the second relay 222 and the third relay 223 are closed, the phase a of the ac power supply 5 is connected to the phase U of the motor 4, the phase B of the ac power supply 5 is connected to the phase V of the motor 4, the phase C of the ac power supply 5 is connected to the phase W of the motor 4, and the motor realizes forward rotation.

Specifically, when the fourth relay 224, the second relay 222 and the fifth relay 225 are closed, the phase a of the ac power supply 5 is connected to the phase W of the motor 4, the phase B of the ac power supply 5 is connected to the phase V of the motor 4, the phase C of the ac power supply 5 is connected to the phase U of the motor 4, and the motor is rotated in the reverse direction.

Specifically, the motor current detection assembly 3 includes a first current detection element 31, a second current detection element 32 and a third current detection element 33, and the motor current detection assembly 3 monitors current data passing through the relay assembly 2, and includes:

one end of the first current detection element 31 is connected to the a phase of the ac power supply 5, and the other end of the first current detection element 31 is connected to the first relay 221 and the fourth relay 224;

one end of the second current detection element 32 is connected to the phase B of the ac power supply 5, and the other end of the second current detection element 32 is connected to the second relay 222;

one end of the third current detection element 33 is connected to the C phase of the ac power supply 5, and the other end of the third current detection element 33 is connected to the third relay 223 and the fifth relay 225.

The output signal ports of the first current detection element 31, the second current detection element 32 and the third current detection element 33 are connected with the input port of the ADC module 12, the motor current detection assembly 3 transmits the monitored current data to the ADC module 12, the current data is converted into a data form processed by the CPU module 11 through the ADC module 12, and when the CPU assembly 1 receives a stop instruction, the CPU module 11 controls the relay assembly 2 to open the circuit within a safety threshold according to the current data.

A motor control method realizes the control of the positive rotation or the negative rotation or the stop of a motor according to the motor control circuit of the isolating switch.

Specifically, when the motor 4 is in a stop state, the CPU component 1 receives a forward rotation instruction and controls the relay driving element 21 based on the forward rotation instruction;

the relay driving element 21 drives the first relay 221 based on the CPU component 1, normally open contacts of the second relay 222 and the third relay 223 are closed, and normally open contacts of the fourth relay 224 and the fifth relay 225 are kept open;

the phase A of the alternating current power supply 5 is connected with the phase U of the motor 4, the phase B of the alternating current power supply 5 is connected with the phase V of the motor 4, the phase C of the alternating current power supply 5 is connected with the phase W of the motor 4, and the motor 4 starts to rotate forwards.

Specifically, when the motor 4 is in a stopped state, the CPU assembly 1 receives a reverse rotation instruction and controls the relay driving element 21 based on the reverse rotation instruction;

the relay driving element 21 drives the normally open contacts of the second relay 222, the fourth relay 224 and the fifth relay 225 to be closed based on the CPU assembly 1, and the normally open contacts of the first relay 221 and the third relay 223 are kept in an open state;

the phase A of the alternating current power supply 5 is connected with the phase W of the motor 4, the phase B of the alternating current power supply 5 is connected with the phase V of the motor 4, the phase C of the alternating current power supply 5 is connected with the phase U of the motor 4, and the motor 4 starts to rotate reversely.

When the motor 4 is in a forward rotation state or a reverse rotation state, the CPU component 1 receives a stop instruction, the CPU component 1 receives current data fed back by the motor current detection component 3, and when the current data is smaller than a set threshold value, the CPU component 1 controls the relay component 2 to cut off the relay, so that the motor 4 starts to stop.

Specifically, the CPU module 1 acquires the relay contact current data output by the motor current detection module 3 in real time through the ADC module 12, the CPU module 11 controls the relay driving element 21 to turn off the relay within a safe threshold range, and at the same time, the CPU module 11 starts timing to obtain the switching-off time of the relay, counts the response time of the relay module 2 to complete the switching-off operation, and adjusts the current threshold for the next switching-off in real time according to the response time, thereby ensuring that the relay module 2 can safely switch off the load current.

The circuit and the method for controlling the isolating switch motor control realize the control of the positive rotation or the reverse rotation or the stop of the motor 4 by controlling the relay component 2 through the CPU component 1 to change the state on the control circuit, adopt the motor current detection component 3 to monitor the current data on the control circuit in real time, ensure the safety of the isolating switch motor control circuit and protect each electrical element of the control circuit, and the control circuit adopts an onboard relay element, so the volume is small and the setting is simple.

Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.

The above embodiments of the present invention are described in detail, and the principle and the implementation of the present invention are described herein by using specific embodiments, and the description of the above embodiments is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

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