A four-phase electrically excited doubly salient pole motor and its open-circuit fault diagnosis method

Abstract

The invention provides a four-phase electrical-excitation double-salient-pole motor and an open-circuit fault diagnosis method of the four-phase electrical-excitation double-salient-pole motor. According to the method, the middle points of two channels are provided with detection resistors, detection voltage of the resistor is sampled, fault features are extracted, and the fault types are diagnosed. If the voltage of the detection resistor is always a negative value when the electrical angle is larger than 0 degree and smaller than or equal to 180 degrees, and the voltage of the detection resistor is always a positive value when the electrical angle is larger than 180 degrees and smaller than or equal to 360 degrees, the A-phase open-circuit fault can be judged; if the voltage of the detection resistor is always a negative value when the electrical angle is larger than 0 degree and smaller than or equal to 180 degrees, and the voltage of the detection resistor is not always a positive value when the electrical angle is larger than 180 degrees and smaller than or equal to 360 degrees, and the open-circuit fault of a pipe (Q1) on the A phase is judged; the rest can be done in the same manner. The fault diagnosis method is simple in control process and free of complex operation, and the positions of the single-pipe open-circuit fault and the single-phase open-circuit fault can be diagnosed by sampling one voltage signal. The method can be further applied and popularized to four-phase brushless direct-current motors.

Description

Technical field [0001] The invention relates to a four-phase electric excitation double salient pole motor and an open circuit fault diagnosis method thereof, belonging to the technical field of motor fault diagnosis. Background technique [0002] The double salient pole motor is a new type of motor composed of a position sensor, a power electronic power converter, a permanent magnet or electromagnetic excitation unit, a controller and a salient pole stator and rotor structure. As a new type of variable reluctance motor, its maximum and minimum reluctance ratio is large, it has better electromechanical energy conversion characteristics, and it has better application prospects in all walks of life. The four-phase electric excitation double salient motor has four-phase windings, and the remaining phases can still work after a single-phase fault occurs, so it is very suitable as a fault-tolerant motor for high-reliability applications. [0003] Accurate and timely diagnosis technolog...

AI Technical Summary

Problems solved by technology

However, this method can only be used for the diagnosis and research of single-tube open-circuit faults of three-phase motors.

Some scholars at home and abroad have also proposed to use model-based fuzzy control and genetic algorithm to extract feature quantities for the normal and faulty operating states of a specific motor drive system to realize motor fault diagnosis. This method is relatively difficult and complicated to implement, and it is difficult to realize real-time fault diagnosis.

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