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
CN111510039BActive Publication Date: 2022-01-25WEICHAI POWER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WEICHAI POWER CO LTD
Publication Date
2022-01-25

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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.
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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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