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A method of testing the initial position angle of motor rotor

A technology of motor rotor and initial position, which is applied in the direction of electronic commutator, electrical components, control system, etc., can solve the problems of the influence of motor load size measurement accuracy, high test condition requirements, wrong values, etc., and achieve online fault diagnosis and The effect of error correction control, low test condition requirements and high accuracy

Active Publication Date: 2020-02-28
JING JIN ELECTRIC TECH HEZE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • A method of testing the initial position angle of motor rotor
  • A method of testing the initial position angle of motor rotor

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Experimental program
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Effect test

Embodiment 1

[0045] Such as figure 1 As shown, in Embodiment 1 of the present invention, a method for testing the initial position angle of the motor rotor includes the following steps:

[0046] Step 1, first give the motor to be tested a current i to make the motor run; the frequency of the current i is relatively low, and it can be tested as long as the motor rotates. The current frequency determines the speed at which the motor rotates, so the frequency of the current i can be within the rated speed range If the frequency of the current i is 1 / 3 of the rated frequency of the motor.

[0047] Step 2, after the motor is running, the current i is zero, that is, i d = 0 and iq = 0;

[0048] Step 3, read the voltage u of the d-axis and q-axis of the motor stator in the converter at this time d , u q ;

[0049] Step 4, according to u d , u q The trigonometric function relationship between calculates the initial position angle deviation θ of the motor rotor at this time err .

[0050] ...

Embodiment 2

[0080] In Embodiment 2 of the present invention, the initial position angle deviation θ of the motor rotor err The trigonometric function relationship of is expressed as follows:

[0081] When the motor rotates forward, the θ err =arccot2(u q ,u d ).

[0082] When the motor rotates in reverse, the θ err =arccot2(-u q ,-u d ).

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/18
CPCH02P6/18H02P21/06H02P21/34H02P21/18H02P21/22
Inventor 刘勇郝斌叶晓
Owner JING JIN ELECTRIC TECH HEZE CO LTD
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