Analysis of a bearingless switched reluctance motor with permanent magnets in the stator yoke

Because a rotor has no permanent magnet and low manufacturing cost, a bearingless switched reluctance motor (BSRM) has unique advantages in medical and health, biochemical reactions, and other applications that need to be abandoned after single use or require the system to deal with high-temperature fluid. By analyzing the topological characteristics of a BSRM, rotor suspension and the mechanism of operation were described. A finite element model of a BSRM with a permanent magnet in the stator yoke (BSRM-PMSY) was established. The performance analysis of the BSRM was emphasized. The airgap flux distribution, no-load permanent magnet flux linkage, and torque of the motor were analyzed under zero load back-electromagnetic flow signals and levitation forces. The results verify that the optimization effect of the new motor on the levitation force is correct and a favorable decoupling control effect is found between the torque and levitation force, which provides the basis for efficient control of the subsequent prototype.