Method for testing initial position angle of motor rotor

Abstract

The invention discloses a method for testing initial position angle of a motor rotor and solves the technical problem that the prior art is high in requirements on initial position angle testing conditions of the motor rotor and difficult in actual operation. The method includes following steps: step 1, applying a current i on a to-be-tested motor to enable the same to run; step 2, after the motor runs, enabling the current i to be zero; step 3, measuring voltage ud and uq of a shaft d and a shaft q of a motor stator; step 4, calculating according to a triangular function relation between ud and uq to acquire initial position angle deviation theta err of the motor rotor. The initial position angle deviation of the motor rotor is calculated by directly using the voltage of the d shaft and the q shaft of the motor stator, and corresponding relation between voltage at the motor end in a motor controller and the initial rotor position angle is made clear; the method is simple and suitable for engineering site operation; online fault diagnosis and error correction control can be realized, and system function safety can be improved.

Description

technical field [0001] The invention relates to a method for testing the initial position angle of the motor rotor, which is used for detecting the initial position angle of the motor rotor. Background technique [0002] With the development and promotion of new energy vehicle technology, the servo performance requirements of motor drives are getting higher and higher. The motor control adopts the vector control method, and the initial position angle of the motor rotor is an important parameter in the vector control, which needs to be tested in advance. [0003] The initial position angle of the motor rotor is an important parameter in motor control. Its accuracy has an important impact on the performance of the motor. Many practical problems encountered in the field are related to the initial position angle error of the motor rotor. The initial position of the motor rotor Accuracy of angle measurement and measurement is critical. [0004] When performing vector control on...

AI Technical Summary

Problems solved by technology

This method requires high test conditions, the size of the motor load will have a great impact on the measurement accuracy, and the actual operation on site is not easy

[0009] Usually, in the motor control system, a parameter of the current position angle of the motor rotor is fed back, but this parameter may be a wrong value, or it may be a correct value, and it cannot be judged whether it is wrong or correct

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