Research Of SVPWM Fault-tolerant Control System Of Five-phase Flux-modulation Permanent-magnet Motor

With the motor drive control technology being studied deeply and being used widely,the necessity for the superior performance of motor control is increasingly significant.Due to its high efficiency,high torque density and high reliability in operation,multi-phase permanent magnet motor has been applied for several occasions which require strong anti-interference in hostile or fault environments.Hence,this type of motors has been attracted wide attention from experts and scholars at home and abroad.In this paper,the five-phase flux-modulation permanent-magnet(FMPM)motor is taken as the research object which possesses characteristic of low-speed high-torque.Firstly,fault-tolerant control algorithm is designed with the five-phase FMPM motor based on space vector pulse width modulation(SVPWM).Secondly,electromagnetic and mechanical characteristics of the five-phase FMPM motor are compared and researched before and after the fault-tolerant control strategy being applied.Simulation and experimental results demonstrate that the five-phase FMPM motor has excellent electromagnetic and mechanical characteristics under fault-tolerant control strategy.Finally,application and development of the five-phase FMPM motor have been effectively promoted by research results.The main contents of this paper are as follows:1.The structure principle and static characteristics of the five-phase FMPM motor are analyzed.In addition,the voltage matrices and mathematical models are deduced under normal condition based on different coordinate systems.Besides,the relationship of coordinate transformation among models is analyzed in detail.2.Based on the background of SVPWM,fault-tolerant control algorithm for the five-phase FMPM motor is designed under single-phase open-circuit fault.Through fault-tolerant control theory,reliable system and stable output of parameters such as motor rotating speed,electromagnetic torque and phase current are guaranteed under fault conditions.3.Simulation model of the five-phase FMPM motor control system is established by MATLAB/Simulink.Simulation of the motor is carried out under normal and fault-tolerant conditions,where the motor rotating speed,electromagnetic torque and phase current waveforms are compared to verify the effectiveness of the algorithm.Simulated results indicate that the five-phase FMPM motor works well under the fault-tolerant control strategy.4.The five-phase FMPM motor platform is established requiring for experiment based on DSP,which develops the hardware and software design including drive circuit design on hardware and program design in control system.Several experimental tests are carried out with hardware and software of the experimental platform.According to the experimental results,reasonability and enforceability of fault-tolerant control strategy are finally demonstrated on the five-phase FMPM motor.