Minor fault diagnosis based on fractional-order model of permanent magnet synchronous motor

Permanent magnet synchronous motor with its high torque density, high efficiency and high reliability, has become the mainstream of the drive system for electric vehicles, elevators, etc. The existing method of fault diagnosis based on the motor model has not considered the fractional characteristics of motor. it is difficult to effectively diagnose minor faults of the current. With the permanent magnet synchronous motor as object, based on fractional mathematical model and unscented kalman filter, establish the minor fault diagnosis method for current. Experiments show that the integer order model is difficult to detect the minor fault, while the fractional model can achieve fault diagnosis.