A method of testing the initial position angle of motor rotor

Abstract

The invention discloses a method for testing the initial position angle of a motor rotor, which solves the technical problems of high requirements for testing conditions for the initial position angle of the motor rotor and difficult actual operation in the prior art. The method includes the following steps: Step 1, firstly, a current i is given to the motor to be tested to make the motor run; Step 2, after the motor runs, the current i is set to zero, that is, i d =0 and i q =0; Step 3, read the voltage u of the motor stator d-axis and q-axis in the converter at this time d , u q ; Step 4, according to u d , u q The trigonometric function relationship between the calculation obtains the initial position angle deviation θ of the motor rotor err . The invention uses the d-axis and q-axis voltages of the motor stator to directly calculate the initial position angle deviation of the motor rotor; the corresponding relationship between the motor terminal voltage and the initial rotor position angle in the motor controller is clarified; the method is simple and suitable for engineering field operations; Fault diagnosis and error correction control to improve system functional safety.

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

Images