Optimal Control Of Bearingless Switched Reluctance Motor Based On High Frequency Pulse Injection

The Bearingless Switched Reluctance Motor(BSRM)has the characteristics of simple structure,good high-speed performance and strong fault tolerance.It has great application prospects in ultra-high-speed flywheel energy storage,aerospace and other fields.The coupling between torque and suspension force has always been an important factor restricting the development of this motor.To this end,the researchers propose the Bearingless Switched Reluctance Motor with Wide Rotor Tooth(BSRMWR)with self-decoupling.This paper proposes an optimal control method for a bearingless switched reluctance motor based on high-frequency pulse injection,aiming at the problems of hidden faults and high hardware cost that the position sensor may bring in practical applications.Firstly,the paper analyzes the motor structure and working principle of the 12/8-pole single-winding BSRMWR,analyzes the decoupling control principle,derives the mathematical model of the motor’s torque and levitation force based on Maxwell’s legislation.Secondly,the traditional current chopping control method is used to build a simulation model and analyze the simulation results.Based on this control method,the control principle of the BSRMWR without position sensor is expounded,that is,injecting high-frequency pulses into the idle phase of the motor current to determine the position of the motor.Thereby replacing the position sensor on the traditional hardware.Then,in view of the abnormal response current caused by the residual current of the motor winding in the traditional high-frequency pulse injection control method,the reasons for its occurrence are analyzed.Using the freewheeling working state of the power converter,the winding current is detected,and the time of pulse injection of the next phase is judged.The traditional control method of high-frequency pulse injection is optimized,and the feasibility and stability of this method are verified by simulation.Finally,an experimental platform is built for the 12/8 BSRMWR,and the hardware and software parts are introduced in detail.High-frequency pulses are injected into the idle phase to capture the response current waveform of the motor,which laid the foundation for the further advancement of the experiment.