Motor locked-rotor fault judgement method, motor controller and new energy automobile

Abstract

The application discloses a motor locked-rotor fault judgement method. The motor locked-rotor fault judgement method comprises the following steps: starting to time when an output torque of a motor is detected to reach a maximum output torque; if a timing time length is determined to be in a process of reaching a first preset time length, keeping the output torque of the motor to be the maximum output torque, when the timing time length is the first timing time length, controlling the motor to reduce the output torque to a target output torque, and re-timing; if the timing time length is determined to be in a process of reaching a second preset time length, keeping the output torque of the motor to be the target output torque, when the timing time length is the second timing time length, determining a locked-rotor fault exists in the motor, and reporting locked-rotor fault information. According to the motor locked-rotor fault judgement method, the over-temperature damage to an IGBT of a motor controller is reduced under a locked-rotor working condition of the motor; meanwhile, the misinformation possibility of the locked-rotor fault is reduced. The application also discloses a motor controller and a new energy automobile based on the motor locked-rotor fault judgement method.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a motor stall fault judgment method. It also relates to a motor controller and a new energy vehicle based on the motor stall fault judgment method. Background technique [0002] In recent years, with the development of high energy density power batteries, new energy vehicles have also flourished. New energy vehicles include hybrid vehicles and pure electric vehicles. As the core components of new energy vehicles - motors and motor controllers, their power, economy, and safety directly affect the overall performance of the vehicle, which in turn reflects the user's driving experience. experience. At present, the electric driving of new energy vehicles mainly relies on the IGBT (composite full-control voltage-driven power semiconductor device) in the motor controller to convert DC power into AC power to drive the permanent magnet synchronous motor. At the same time, t...

AI Technical Summary

Problems solved by technology

However, if the preset time is too short, in the actual operation of the vehicle, it may not be possible to accurately determine whether the vehicle is in a locked-rotor condition within a relatively short period of time, which may cause a false report of a locked-rotor failure, causing customer complaints

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