Torque sharing and predictive current control of dual-winding bearingless switched reluctance motors for torque ripple reduction

Conventional control strategies of the dual-winding bearingless switched reluctance motor (DWBSRM) produce large torque ripples due to the selections of the conducting phases and the waveforms of the reference currents. In order to solve the problem and realize good levitation performance at the same time, this paper proposes a novel control strategy which combines torque sharing method with predictive current control method. First, torque and levitation force commands are distributed among the three phases according to the rotor position. After that, the reference currents of the two sets of windings are calculated. Finally, a predictive current control algorithm is used to track the current commands by generating precise duty ratios applied to the two converters. The proposed method is verified by the simulation in MATLAB/Simulink in comparison with conventional control methods.