Method and system for rapidly detecting demagnetization of permanent magnet synchronous motor of electric vehicle

Abstract

The invention discloses a method and a system for quickly detecting demagnetization of a permanent magnet synchronous motor of an electric automobile, which relate to the technical field of automobile detection and comprise a data acquisition step, an effective working condition determination step, a current change determination step, an efficiency determination step, a critical threshold determination step and a demagnetization aging judgment step. According to the method, the demagnetization aging degree of the motor is analyzed, the calculated amount is small, online real-time detection can be achieved, and the reliability is high.

Description

technical field [0001] The invention relates to the technical field of vehicle detection, in particular to a method and system for quickly detecting demagnetization of a permanent magnet synchronous motor of an electric vehicle. Background technique [0002] Permanent magnet synchronous motors are widely used in new energy vehicles because of their simple structure, reliable operation, small size, light weight, low loss, high efficiency, strong overload capacity, high energy density and wide speed range. However, when the permanent magnet synchronous motor suffers from high temperature, armature reaction (including overcurrent) and mechanical vibration caused by stator turn-to-turn or phase-to-phase short circuit, the permanent magnet will undergo irreversible demagnetization, which will affect the performance of the permanent magnet and cause the motor torque Performance degradation, and even serious consequences such as motor scrapping, especially for electric vehicles, di...

AI Technical Summary

Problems solved by technology

Among them, the analysis of the coil back EMF signal is used to realize the demagnetization detection, but this method can only be detected when the motor is powered off, and cannot be detected on the spot when the motor is running

Consider the influence of temperature on the permanent magnet synchronous motor, and measure the state of the permanent magnet through the active short-circuit current. This method requires more instruments for measurement, and the measurement method is more complicated

At present, the hidden danger of permanent magnet synchronous motor demagnetization has not been solved. Most of the research is only at the stage of simulating the ideal model with SIMULINK in the laboratory, and the existing methods are relatively complicated, which cannot be quickly detected online in real time, which affects the motor. operational reliability

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