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

A technology of three-phase current and three-phase motor, which is applied in the control of electromechanical transmission, control of generators, motor control, etc., can solve problems such as phase current overcurrent faults, and achieve the effect of avoiding overcurrent faults

Active Publication Date: 2022-01-25
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, equipment and storage medium for preventing three-phase motor from overcurrent

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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 obtained 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, comprising: performing 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; when the three-phase current When the preset three-phase current threshold is exceeded, the three-phase current is corrected to obtain the corrected three-phase current; Park transformation and Clark transformation are performed on the corrected three-phase current to obtain the corrected D-axis demand current and Q-axis demand current; When the absolute value of the motor speed is less than the preset speed threshold, output the corrected D-axis demand current and Q-axis demand current; when the absolute value of the motor speed is greater than the preset speed threshold, reacquire the D-axis demand current and Q-axis according to the formula shaft demand current, repeat all the above steps. Through the above method, the motor can avoid the overcurrent fault.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02P29/032
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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