Mathematical Modeling of a Parallel-Winding Bearingless Permanent Magnet Synchronous Motor

Le résumé fourni par la source

For the problem of excessive terminal voltage in a single-winding bearingless permanent magnet synchronous motor (BPMSM) levitation inverter, this paper designs a parallel-winding bearingless permanent magnet synchronous motor (PW-BPMSM) structure, make it possible to control the suspension inverter with only a low drive voltage to achieve its control requirements. First, characterization of the motor's electromagnetic structure and clarification of the levitation force generation principle are performed. Secondly, through a combination of air gap magnetic field analysis modeling and dynamic response experiments, it was proven that the output voltage of the suspension inverter is in a one-to-one mapping relationship with the suspension current, and verified the independent control characteristics of torque current on the suspension system. Then developed the PW-BPMSM radial levitation model using Maxwell tensor theory, concluding with suspension force simulations via finite element analysis. Finally, the levitation force of PW-BPMSM is simulated based on the finite element analysis method. The results show that there is a basically linear relationship between controllable magnetic levitation force and levitation current, as well as between uncontrollable levitation force and rotor eccentric displacement, which verifies the accuracy of the levitation force mathematical model.

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