A permanent magnet synchronous motor fault detection method, system and vehicle

Abstract

The invention provides a permanent magnet synchronous motor fault detection method, system and automobile, and relates to the field of automobile fault detection. The permanent magnet synchronous motor fault detection method includes: when the rotational speed of the permanent magnet synchronous motor to be detected is zero and the vehicle is in an active discharge process, periodically estimating the first output torque of the permanent magnet synchronous motor according to a preset control cycle ; Carry out band-pass filtering on the first output torque to obtain the second output torque; calculate the torque fluctuation coefficient in the detection period according to the second output torque; judge whether the permanent magnet synchronous motor to be detected is A rotor position zero offset fault exists. The above solution detects the fault of the zero point deviation of the rotor position of the permanent magnet synchronous motor when the vehicle is actively discharging and the motor speed is zero. The detection process will not interfere with the normal driving of the vehicle; Changes to vehicle propulsion 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 ...

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