Compensation Control Method For Winding Open Circuit Fault Of Bearingless Switched Reluctance Motor

Bearingless switched reluctance motor(BSRM)is composed of switched reluctance motor(SRM)based on bearingless technology.BSRM inherits the structure of fixed and rotor double salient poles,combines suspension and rotation functions,and has the advantages of small friction,long life and easy control.Therefore,it is widely used in high-speed and ultra high-speed fields such as aviation aircraft and new automobiles,as well as in situations with high reliability requirements.There is a strong coupling between the levitation force and torque of BSRM,so many experts and scholars have proposed different methods to solve this problem.The bearingless switched reluctance motor with wider rotor teeth involved in this paper solves this problem by starting from the motor body mechanism,changing the rotor structure and expanding the mechanical angle of its polar arc.In response to the high requirements of motor applications,it is urgent to improve the reliability and stability of the motor,this paper presents a winding open-circuit fault compensation control method for bearingless switched reluctance motor.Firstly,introduce the 12/8 pole single winding BSRMWR,analyze its structural characteristics,describe its working principle,and use Maxwell tensor method to derive mathematical models of torque and suspension force,and the mathematical model of suspension force is further simplified.Draw the torque and suspension force characteristic curve table of the motor,and create a threedimensional curve graph,laying a theoretical foundation for the proposal of compensation control methods for winding open circuit faults.Secondly,the open circuit fault of the 12/8 pole single winding BSRMWR is studied.The traditional current chopping control strategy(CCC)and direct instantaneous torque and direct levitation force control strategy(DITC&DFC)are introduced,and their working principles were explained respectively.Based on two different control strategies,the impact of open circuit fault of the winding on the suspension force and torque of the motor during operation is compared through simulation.Then,a compensation control principle is proposed to address the different effects of winding open circuit faults on suspension force and torque.Propose different compensation control methods based on CCC strategy and DITC&DFC strategy,establish simulation models,and analyze the feasibility and effectiveness of compensation.Finally,establish an experimental platform based on the 12/8 pole single winding BSRMWR system,improve hardware circuits,software programs,complete hardware circuit debugging,verify the feasibility of the system platform,and lay the foundation for winding open circuit fault and compensation control experiments...