Six-phase Permanent Magnet Synchronous Motor Drive System Fault Diagnosis And Fault-tolerant

This paper has mostly studied the six-phase permanent magnetism synchronous motor And we have studied how to detect the electric and analyse faults in motor interior and drive circuits. Wavelet transform was adopted to study and simulate in MATLAB/Simulink. Secondly, study has been done for turn-turn short circuit faults of motor.The provided six-phase permanent magnetism synchronous motor used one phase drive one phase to design . consequently, it will ensure the insulation among phases and reduce the probability of faults coming into being . the redundance idea was adopted to improve the reliability of drive system. To drive power convertor , It will not affect the start-up and running of motor when the faults of a or many bridges come forth. Just owing to the reliable characteristic of structure, so it was used to the universe and submarine pushing systems and electromotion mixing fuel system and electric power traction fileds. And in aviation and space fields.To take into account the fundamentality of the fault signal detected, and the predominance of wavelet in time- frequency field to analyse and deal with the transient and unbalanced signals and distill signal fault characteristic. The paper will concentrate in the detecting method , The emphases is how to use wavelet analysis to motor electric fault diagnose. And discusses the characteristic of all kinds of wavelet functions and the conformation of wavelet functions, and the principle to choose in practice and the problem to eliminate noise, To improve the characteristic of fault detecting furtherly and detect reliably and effectually ,we have done much.This paper takes db1 and db5 wavelet function to diagnose the fault of phase winding and phase-ground in PMSM and to distill current signal fault characteristic and to eliminate noise . simulation has proved that the wavelet analyse can realize the fault characteristic of instantaneous signal to distill and analyse. And the same time , simulation has been taken and studied about the open-circuit and short- circuit faults in drive system.