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Method, device and equipment for preventing overcurrent of three-phase motor, and storage medium

A three-phase current, three-phase motor technology, used in the control of electromechanical transmission, control of generators, motor-generator control, etc., can solve problems such as phase current overcurrent faults

Active Publication Date: 2020-08-07
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current method of directly obtaining the D-axis current and Q-axis current based on table lookup or calculation, and then directly performing subsequent calculations, does not judge whether the required D-axis current and Q-axis current are reasonable, so phase current overcurrent faults are prone to occur. There are security risks

Method used

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  • Method, device and equipment for preventing overcurrent of three-phase motor, and storage medium
  • Method, device and equipment for preventing overcurrent of three-phase motor, and storage medium
  • Method, device and equipment for preventing overcurrent of three-phase motor, and storage medium

Examples

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Embodiment 1

[0045] An embodiment of the present disclosure provides a method for preventing overcurrent of a three-phase motor, figure 1 It is a schematic flowchart of a method for preventing overcurrent of a three-phase motor according to an exemplary embodiment.

[0046] Such as figure 1 As shown, a method to prevent overcurrent of a three-phase motor includes:

[0047] S101 performs inverse Park transformation and inverse Clark transformation on the obtained D-axis demand current and Q-axis demand current to obtain the three-phase current of the motor;

[0048] Specifically, before inverse Park transformation and inverse Clark transformation are performed on the obtained D-axis demand current and Q-axis demand current, it also includes obtaining the D-axis demand current and Q-axis demand current of the motor, where the query torque- The speed-D-axis ammeter and torque-speed-Q-axis ammeter can directly obtain the required D-axis current and Q-axis current, or directly obtain the D-ax...

Embodiment 2

[0082] An embodiment of the present disclosure provides a method for preventing overcurrent of a three-phase motor, figure 2 It is a schematic flowchart of a method for preventing overcurrent of a three-phase motor according to an exemplary embodiment.

[0083] Such as figure 2 As shown, a method to prevent overcurrent of a three-phase motor includes:

[0084] Step 1: Directly obtain the required D-axis current and Q-axis current by querying the torque-speed-D-axis ammeter and torque-speed-Q-axis ammeter, or directly obtain the D-axis demand current and Q demand current through formula calculation.

[0085] Step 2: Perform inverse Park transformation and inverse Clark transformation on the acquired D-axis demand current and Q-axis demand current to obtain three-phase currents Iu, Iv and Iw of the motor.

[0086] Step 3: Determine whether any one of the three-phase currents Iu, Iv and Iw of the motor exceeds the preset phase current threshold. When any one of the three-phas...

Embodiment 3

[0095] An embodiment of the present disclosure provides a device for preventing overcurrent of a three-phase motor, image 3 It is a structural schematic diagram of a device for preventing overcurrent of a three-phase motor according to an exemplary embodiment.

[0096] Such as image 3 As shown, in an embodiment of the present disclosure, a device for preventing overcurrent of a three-phase motor includes:

[0097] S301 The first transformation module is used to perform inverse Park transformation and inverse Clark transformation on the obtained D-axis demand current and Q-axis demand current to obtain the three-phase current of the motor;

[0098] S302 correction module, used to correct the three-phase current when the three-phase current exceeds the preset three-phase current threshold, and obtain the corrected three-phase current;

[0099] S303 The second transformation module is used to perform Park transformation and Clark transformation on the corrected three-phase cu...

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Abstract

The invention discloses a method for preventing overcurrent of a three-phase motor. The method comprises the steps: carrying out reverse Park conversion and reverse Clark conversion on obtained D-axisrequired current and obtained Q-axis required current to obtain a three-phase current of a motor; when the three-phase current exceeds a preset three-phase current threshold, correcting the three-phase current to obtain a corrected three-phase current; carrying out Park conversion and Clark conversion on the corrected three-phase current to obtain corrected D-axis required current and Q-axis required current; when the absolute value of the rotating speed of the motor is smaller than a preset rotating speed threshold value, outputting the corrected D-axis required current and Q-axis required current; and when the absolute value of the rotating speed of the motor is greater than the preset rotating speed threshold, obtaining the D-axis required current and the Q-axis required current againaccording to a formula, and repeatedly executing all the steps. Through the method, overcurrent faults of the motor can be avoided.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method, device, equipment and storage medium for preventing overcurrent of a three-phase motor. Background technique [0002] Under the conditions of rapid acceleration, rapid deceleration, and rapid changes in motor speed, motor phase current overcurrent faults are prone to occur. When an overcurrent fault occurs, it will not only seriously affect the driving experience of customers, but also cause serious Security risks. [0003] In the prior art, after receiving the demand command of the whole vehicle, the required D-axis current and Q-axis current can be directly obtained by querying the torque-speed-D-axis ammeter and the torque-speed-Q-axis ammeter, or calculated by formula Directly obtain the D-axis current and Q-axis current, and then output the modulation signal after PID adjustment and SVPWM algorithm, and then control the motor action. However, the current me...

Claims

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Application Information

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IPC IPC(8): H02P21/14
CPCH02P21/14
Inventor 徐亚美李强高文进吕凤龙胡刚毅
Owner WEICHAI POWER CO LTD
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