Permanent magnet synchronous motor fault detection method and system, and automobile

Abstract

The invention provides a permanent magnet synchronous motor fault detection method and system, and an automobile, and relates to the field of automobile fault detection. The permanent magnet synchronous motor fault detection method comprises the following steps: when a rotating speed of a permanent magnet synchronous motor to be detected is zero and a vehicle is in an active discharge process, periodically estimating a first output torque of the permanent magnet synchronous motor according to a preset control period; performing band-pass filtering on the first output torque to obtain a secondoutput torque; calculating a torque fluctuation coefficient in a detection time period according to the second output torque; and judging whether the permanent magnet synchronous motor to be detectedhas a rotor position zero deviation fault or not according to whether a torque fluctuation coefficient is greater than a preset threshold or not. According to the scheme, when the vehicle is activelydischarged and the rotating speed of the motor is zero, the rotor position zero-point deviation fault of the permanent magnet synchronous motor is detected, and the normal running of the vehicle is not interfered in a detection process; meanwhile, the scheme is convenient to implement and does not involve the change of vehicle driving system hardware.

Description

technical field [0001] The invention relates to the field of automobile fault detection, in particular to a permanent magnet synchronous motor fault detection method, system and automobile. Background technique [0002] Different from traditional fuel vehicles, pure electric vehicles drive the wheels through motors to drive the vehicle. As the core component of pure electric vehicles, the motor has a great impact on the performance of the vehicle. Among them, the permanent magnet synchronous motor (PMSM) has high efficiency, high output torque, The advantages of high power density and good dynamic performance have become the mainstream of pure electric vehicle drive systems. Safety and reliability are the basic requirements for the normal operation of pure electric vehicles. At the same time, ride comfort is also one of the important directions pursued by current pure electric vehicle products. For pure electric vehicles with permanent magnet synchronous motors as the power ...

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a permanent magnet synchronous motor fault detection method, system, and vehicle to solve the problem of fault detection when a slight deviation occurs in the zero point of the permanent magnet synchronous motor rotor

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