A permanent magnet synchronous motor fault diagnosis and fault-tolerant control system and method

Abstract

The present invention discloses a permanent magnet synchronous motor (PMSM) fault diagnosis and fault-tolerant control system and method. The method can be used in motor medium-high speed running period. In PMSM field oriented control (FOC), position and speed information of a rotor, DC bus voltage and two or three current sensors are required. According to the PMSM fault diagnosis and fault-tolerant control system and method, an estimated rotor speed and an estimated resistance value are inputted into a decision making unit based on a model reference adaptive system (MRAS) observer capable of motor speed and resistance value identification, so that the fact that whether a motor position sensor goes wrong, an armature winding component open circuit fault and an inter-turn short circuit fault are identified. According to the PMSM fault diagnosis and fault-tolerant control system and method, the fact that whether a motor phase current sensor goes wrong, a fault location and fault status of the position sensor can be judged, when the position sensor goes wrong, the control system can switch to speed sensorless vector control automatically, so that the system has a certain fault-tolerant capability, and thus the system can ensure normal operation of the motor in some specific applications.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet synchronous motors (PMSM), in particular to a permanent magnet synchronous motor fault diagnosis and fault-tolerant control system and method, which is suitable for a permanent magnet synchronous motor control system with position sensor feedback. Background technique [0002] Due to the advantages of high power density, compact structure, small size, and reliable operation, permanent magnet synchronous motors are widely used in various occasions. In field-oriented control (FOC) of permanent magnet synchronous motors, DC bus voltage, motor armature current and rotor position information are usually required, and the detection of their status is crucial to the normal operation of the motor. Usually, the permanent magnet synchronous motor needs to be installed with a position sensor to obtain the rotor position, usually a photoelectric encoder; however, in some harsh environments, the photo...

AI Technical Summary

Problems solved by technology

Usually, the permanent magnet synchronous motor needs to be installed with a position sensor to obtain the rotor position, usually a photoelectric encoder; however, in some harsh environments, the photoelectric encoder is prone to failure, and the position information of the rotor cannot be given correctly, and the FOC control cannot be performed normally. In order to ensure the reliability of the control system, it is necessary to design a corresponding fault-tolerant control system so that the motor can operate normally even if the position sensor fails.

[0003] The position sensorless vector control of permanent magnet synchronous motor usually estimates the rotor position by the observer without the need of a position sensor, so it has the advantages of low cost and high reliability. It is difficult for the controller to accurately estimate the position information of the rotor

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