Permanent magnet synchronous motor demagnetization fault detection method and device, and automobile

Abstract

The invention discloses a permanent magnet synchronous motor demagnetization fault detection method and device, and an automobile. The method comprises the steps of acquiring the state of a motor; when the motor state is a steady state, obtaining a first torque estimation value output under the steady state condition of the motor, and calculating steady state deviation delta E according to the first torque estimation value; when the motor state is a transient state, obtaining a second torque estimation value output under the motor transient state condition, and calculating a transient characteristic evaluation parameter Es according to the second torque estimation value; and judging whether the motor has a demagnetization fault according to the steady-state deviation delta E and the transient characteristic evaluation parameter Es. The permanent magnet synchronous motor demagnetization fault detection method realizes fault detection when a motor permanent magnet demagnetization fault,especially when the motor permanent magnet demagnetization fault does not reach a severe demagnetization state, is clear in thought, clear in detection mechanism, small in required calculation amountand easy for engineering realization, does not involve change of system hardware, does not increase system cost. Therefore, the method has good popularization value.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a method and device for detecting a demagnetization fault of a permanent magnet synchronous motor and an automobile. Background technique [0002] Electric vehicles drive the wheels through motors to drive the vehicle. As the core functions of electric vehicles, motor drive and control have a great impact on the performance of the vehicle. Therefore, it has become the focus of research by major pure electric vehicle manufacturers at home and abroad. With the development of permanent magnet materials, power electronics technology, control theory, motor manufacturing and signal processing hardware, permanent magnet synchronous motor (PMSM) has been widely used. Due to its high efficiency, high The advantages of output torque, high power density, and good dynamic performance have become the mainstream of pure electric vehicle drive systems. Although the permanent magnet synchronous ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, the present invention provides a permanent magnet synchronous motor demagnetization fault detection method, device and automobile, which solves the problems in the prior art that the calculation amount is huge and takes up a lot of hardware resources, and the accuracy of the estimation is affected by system interference and the motor system Parameter influence and other issues, realize the fault detection of motor permanent magnet demagnetization fault, especially when the state of severe demagnetization is not reached

Images