Fault-tolerant control method for position sensor fault of brushless direct current motor rotor

Abstract

The present invention relates to a fault-tolerant control method for the position sensor fault of a brushless direct current motor rotor. The invention is structurally characterized in that the hall control mode and the non-hall control mode are integrated to realize the automatic switching function. According to the technical scheme of the method, the abnormal condition of the position signal of the motor rotor is detected, and then the system continues to control the motor when being switched from the position sensor mode to the non-position sensor mode. Meanwhile, the fault-tolerant control is realized at the same time. In the position sensor mode, a hall signal is adopted as a motor rotor phase-change basis. In the non-position sensor mode, the three-phase counter electromotive force signal of a motor is adopted as a motor rotor phase-change basis. In this way, the fault diagnosis method can quickly locate a fault and to select a corresponding mode. As a result, the fault-tolerant control of the motor is realized.

Description

technical field [0001] The invention relates to a fault-tolerant control method for failure of a rotor position sensor of a brushless DC motor, and the fault-tolerant control method is applied to the control field of pure electric vehicles and other brushless DC motors. Background technique [0002] Traditional brushless DC motor controllers generally use two modes with a rotor position sensor or without a rotor position sensor to control the motor. A motor controller with a rotor position sensor generally uses a Hall sensor to obtain the position signal of the motor rotor, but the Hall sensor often cannot work normally due to environmental factors such as temperature, dust, electromagnetic interference, or even damages in severe cases. Ultimately, the motor and controller cannot operate normally. At present, the phase loss control of the motor is often used to achieve fault-tolerant control, that is, when one or two Hall sensors fail, the commutation time of the rotor is c...

AI Technical Summary

Problems solved by technology

This method selects the corresponding mode to control the motor according to the integrity of the Hall signal, so the controller can effectively solve the problem that the Hall sensor fails when the brushless DC motor is running and the motor cannot run, and at the same time fully combines the Hall sensor control The advantages of both mode and Hall sensorless control mode, thus improving the stability and reliability of the motor control system

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