Performance Enhancement and Control Strategy for Dual-Stator Bearingless Switched Reluctance Motors in Magnetically Levitated Artificial Hearts

As an implantable life-support device, the magnetically levitated artificial heart demands a motor with high efficiency, low loss, contactless operation, and exceptional reliability. To overcome friction loss and torque ripple at high speed in conventional switched reluctance motors, this paper proposes an 18/15/6-pole double stator bearingless switched reluctance motor (DSBSRM) and its control system. The dual stator configuration spatially decouples torque and levitation fields, enhancing stability. A variable overlap angle TSF-PWM-DITC composite strategy suppresses torque ripple, while a new reaching law terminal sliding mode controller (NRLTSMC) ensures rapid, disturbance-resistant radial positioning. MATLAB/Simulink verification demonstrates significant reductions in torque, speed, and radial displacement fluctuations, offering a viable solution for next-generation artificial-heart drives.