Design for Reducing Bearing Force Ripple and Torque Ripple of Integrated Magnetic Bearing Motor through Halbach Array

In-Jun Yang, Min-Ki Hong, Ju Lee, Won-Ho Kim and Dong-Hoon Jung ()
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In-Jun Yang: Department of Electrical Engineering, Hanyang University, Seoul 04763, Republic of Korea
Min-Ki Hong: Department of Electrical Engineering, Gachon University, Seongnam 13120, Republic of Korea
Ju Lee: Department of Electrical Engineering, Hanyang University, Seoul 04763, Republic of Korea
Won-Ho Kim: Department of Electrical Engineering, Gachon University, Seongnam 13120, Republic of Korea
Dong-Hoon Jung: Department of Mechanical, Automotive and Robot Engineering, Halla University, Wonju 26404, Republic of Korea

Energies, 2023, vol. 16, issue 3, 1-17

Abstract: When a magnetic bearing is used in the design of a high-speed motor, no friction and wear occur because of the principle of magnetic levitation; however, the size of the entire system increases. An integrated magnetic bearing motor is a motor with a magnetic bearing inserted inside the rotor that can minimize the increase in the size of the entire system. In this study, a method to reduce the bearing force ripple and torque ripple of an integrated magnetic bearing motor through parameters for a Halbach array and permanent magnet tapering is proposed. When designing an integrated magnetic bearing motor, because the magnetic bearing is located inside the rotor, the influence of the magnetic flux of the rotor and stator on the magnetic flux of the magnetic bearing should be minimized. By combining the magnetic fluxes of the magnetic bearing, rotor, and stator at the rotor back yoke, magnetic saturation occurs, and the performance of the bearing force and torque ripples decreases. The bearing force and torque according to the Halbach array and permanent magnet tapering were analyzed using finite element analysis. The average bearing force and torque were maximized, and the ripple was minimized through the rotor parameters. Thus, the validity of the main design variables selected to improve the output characteristics was confirmed.

Keywords: magnetic bearing (MB); surface permanent magnet synchronous motor (SPMSM); Halbach array; bearing force; bearing force ripple; integrated magnetic bearing motor (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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