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Magnetic-Flux Balance Control to Eliminate Voltage Deviation on Split Phase Capacitor for 4-DOF Bearingless SRM

Lookup NU author(s): Dr Xu DengORCiD

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Abstract

© 1986-2012 IEEE.The four degrees of freedom (4-DOF) 12/4 bearingless switched reluctance motor (BSRM) generally requires 48 power devices, 24 current sensors, and 2 microchips to simultaneously achieve rotation and levitation. To reduce the number of power devices and sensors used in the system, a split-phase converter and a multiplexed-sensor method are employed. However, significant voltage deviation occurs on the two split-phase capacitors due to the inconsistent levitation currents, which deteriorates the levitation performance. Therefore, this paper proposes a magnetic-flux balance control (MFBC) method to solve this problem. The method constrains the total current of all windings in each phase to form a balanced bias magnetic flux. By balancing the discharge depth of the two split-phase capacitors, voltage deviation is eliminated and stable levitation operation is ensured. Moreover, an improved multiplexed-sensor method is developed to enhance levitation stability at high speeds. Finally, the demonstrated performance of the proposed scheme is verified on a test rig of a 4-DOF 12/4 BSRM-type magnetic levitation system.

Publication metadata

Author(s): Cui Q, Cao X, Deng Z, Deng X, Wang Z

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Energy Conversion

Year: 2025

Pages: epub ahead of print

Online publication date: 16/09/2025

Acceptance date: 02/04/2018

ISSN (print): 0885-8969

ISSN (electronic): 1558-0059

Publisher: Institute of Electrical and Electronics Engineers Inc.

URL: https://doi.org/10.1109/TEC.2025.3610412

DOI: 10.1109/TEC.2025.3610412

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