Method for detecting static eccentric fault of built-in permanent magnet synchronous motor for electric vehicle

Abstract

The invention provides a method for detecting a static eccentric fault of a built-in permanent magnet synchronous motor for an electric vehicle, and relates to a motor test method. The steps are as follows: determining the number of unit motors in the permanent magnet motor; setting winding voltage test lines of the unit motors; testing a no-load counter electromotive force of each phase of each unit motor; extracting a maximum or minimum value of the no-load counter electromotive force of each phase of each unit motor, figuring out an average value of the maximum or minimum values of the no-load counter electromotive forces of various phases of various unit motors, and calculating a distortion rate delta of each unit motor; if delta is equal to 0, indicating that no static eccentricity occurs; if delta is not equal to 0, testing known standard motors with different eccentricity ratios, obtaining a corresponding relationship between the distortion rate of each unit motor and a static eccentric circumferential angle, and establishing a data prediction model; and importing the delta into the established data prediction model to obtain the static eccentric circumferential angle and the static eccentricity ratio of a permanent magnet motor to be tested. The method provided by the invention has the advantages of simple principle, convenient use, higher versatility and high accuracy.

Description

technical field [0001] The invention relates to a detection method for static eccentric faults of built-in permanent magnet synchronous motors, more precisely, it is suitable for detecting static eccentric faults of all permanent magnet synchronous motors. Background technique [0002] The built-in permanent magnet synchronous motor has the advantages of high efficiency, high torque density, strong anti-demagnetization ability, good magnetic weakening performance, and wide speed range, and has been widely used in the field of electric vehicles. Due to the influence of factors such as motor manufacturing and installation errors, bearing wear, and electric vehicles under the influence of harsh operating conditions and obvious load changes, the stator and rotor of the motor may be eccentric. Among them, the rotation center of the rotor is fixed, and the geometric center of the stator is offset, resulting in uneven circumferential distribution of the air gap, which is static ecc...

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Problems solved by technology

[0009] The purpose of the present invention is to solve the shortcomings of the above-mentioned prior art such as complex detection, high cost, difficult operation, and difficulty in mass production detection, and to provide a built-in permanent sensor with simple principle, convenient use, high versatility, and accurate measurement. Detection Method of Static Eccentric Fault of Magnetic Synchronous Motor

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