Research On Bearingless Switched Reluctance Motor Based On The Variable-angle Rotating Coordinate System

Bearingless switched reluctance motor(BSRM)integrates functions of rotation and levitation and has the advantages of simple structure,flexible control,and high fault-tolerance ability.Therefore,it has a potential application prospect in the field of aerospace.In order to achieve the decoupling of radial suspension force and simplify the derivation of mathematical model,this paper proposes the concept of variable-angle rotating coordinate system.Then the 12/8 pole dual-winding BSRM and the 6/4 single-winding CBSRM are studied accordingly.Firstly,the mathematical model of a 12/8 dual-winding BSRM based on the variable-angle rotating coordinate system is derived.The superiority of the model is verified by comparing with the traditional model.Then the DTC&DFC technology of 12/8 dual-winding BSRM is described.The fault-tolerant control is introduced based on DTC&DFC.The correctness of control is verified by the MATLAB/Simulink dynamic simulation results.Secondly,the experimental platform of 12/8 dual-winding BSRM is illustrated.The steady-state and dynamic fault-tolerant experiments based on DTC&DFC strategy are completed,which verify the demonstrated performance of the fault-tolerant compensation strategy.Finally,the mathematical model of a 6/4 single-winding CBSRM based on the variable-angle rotating coordinate system is derived,and is verified with the finite-element simulation results.After that,the control method is developed to regulate the torque and radial forces for the CBSRM.Accordingly,the dynamic simulation model is built in MATLAB/Simulink to verify the proposed method.