Phase failure diagnosis method of PMSM (permanent magnet synchronous motor) drive system of electric vehicle

Abstract

The invention discloses a phase failure diagnosis method of a permanent magnet synchronous motor (PMSM) drive system of an electric vehicle. According to the method, a drive failure of the PMSM drive system of the electric vehicle is detected based on detectable stator current, and a phase failure of the PMSM drive system can be diagnosed in real time in an on-line manner. The method can be applicable to running conditions of the electric vehicle, has technical advantages of high failure diagnosis speed, high diagnosis precision and the like, and is easily integrated with the control of the electric drive system to realize the safe and reliable running of the electric drive system.

Description

technical field [0001] The invention belongs to the field of electric vehicles, and is suitable for the diagnosis method of the phase loss fault of the PMSM electric drive system of the electric vehicle. Background technique [0002] Currently, the environment and energy are becoming a growing concern. In the automotive field, efficient, energy-saving and environmentally friendly new energy vehicles have become one of the inevitable development trends of the automotive industry. The electric drive system can achieve the purpose of low energy consumption and zero emission, and has great market prospects. [0003] Electric vehicle drive motors mostly use brushless DC motor (BLDCM) and permanent magnet synchronous motor (PMSM). PMSM with superior performance is more and more favored by researchers and electric vehicle manufacturers. As one of the core components of new energy vehicles A PMSM drive system, its safe and reliable operation is crucial. Traditional fault detectio...

AI Technical Summary

Problems solved by technology

[0008] The first detection method, due to the detection accuracy of the current sensor, even if the current of a certain phase is zero, the value detected by the sensor is not zero, and the threshold needs to be set reasonably; as for the second detection method, although the negative sequence current can be used Extract phase-open fault features, but due to the difficulty in extracting negative-sequence current, the existence of negative-sequence current and harmonics in the motor starting process affect the reasonable selection of negative-sequence current threshold; for the third detection method, considering that this method needs to calculate the three-phase current The effective value is more complicated to implement, and the running program consumes more resources, so it cannot be directly applied to the phase-loss fault diagnosis of the PMSM drive system of electric vehicles

Images