Abstract
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.
Highlights
In recent years, bearingless motors have achieved important application value in aerospace, medicine, and chemical industries due to their characteristics of zero mechanical friction, no lubrication requirement, and complete separation of the stator and the rotor.1,2 Most of the early bearingless motors are of the rotor permanent magnet type
By analyzing the topological characteristics of the BSRMPMSY, in this paper, we describe the rotor suspension and operation mechanism, establishing the finite element model of the prototype, with a focus on the performance analysis of the bearingless switched reluctance motor (BSRM)-PMSY, and analyze the airgap flux distribution, no-load permanent magnet flux linkage, and torque of the motor under zero load backelectromagnetic flow signals (EMF) and levitation force
The results show that the new motor still has a good effect on the levitation force in the case of fewer permanent magnets and exerts a good decoupling control effect between the levitation force and torque, laying a foundation for efficient control over the prototype below
Summary
Bearingless motors have achieved important application value in aerospace, medicine, and chemical industries due to their characteristics of zero mechanical friction, no lubrication requirement, and complete separation of the stator and the rotor. Most of the early bearingless motors are of the rotor permanent magnet type. To further reduce suspension power consumption and improve suspension output capacity, a bearingless switched reluctance motor with a permanent magnet in the stator yoke (BSRM-PMSY) is proposed. It has a doubly salient structure, in which the outer stator and the rotor separately adopt a six-pole and a four-pole doubly salient structure, respectively. By analyzing the topological characteristics of the BSRMPMSY, in this paper, we describe the rotor suspension and operation mechanism, establishing the finite element model of the prototype, with a focus on the performance analysis of the BSRM-PMSY, and analyze the airgap flux distribution, no-load permanent magnet flux linkage, and torque of the motor under zero load backelectromagnetic flow signals (EMF) and levitation force. The results show that the new motor still has a good effect on the levitation force in the case of fewer permanent magnets and exerts a good decoupling control effect between the levitation force and torque, laying a foundation for efficient control over the prototype below
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