Optimization Design of Unequal Amplitude Modulated Poles for the Bearingless PMSM

Huimin Wang, Yuting Lu, Shuang Wu and Liyan Guo
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Huimin Wang: School of Electrical Engineering, Tiangong University, Tianjin 300387, China
Yuting Lu: School of Electrical Engineering, Tiangong University, Tianjin 300387, China
Shuang Wu: School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Liyan Guo: School of Electrical Engineering, Tiangong University, Tianjin 300387, China

Energies, 2022, vol. 15, issue 9, 1-13

Abstract: The structural parameters of an equal amplitude modulated magnetic pole is limited by the length of the air-gap. When the modulation ratio or carrier ratio is small, the spacing of permanent magnets is too large, which will lead to a worse cogging effect, and then the torque optimization effect is not satisfying. In order to improve the operation stability of a bearingless permanent magnet synchronous motor (bearingless PMSM), an unequal amplitude modulated magnetic pole structure is proposed according to the principle of magnetic pole modulation. The Taguchi method is used to optimize the structural parameters of the unequal amplitude modulated magnetic pole with the goal of reducing the torque and suspension force fluctuation. Three kinds of magnetic pole structures, named the whole magnetic pole, the equal amplitude modulated magnetic pole and the unequal amplitude modulated magnetic pole are compared and verified. The results show that the proposed structure of the unequal amplitude modulated magnetic pole can effectively further decrease the torque and suspension force fluctuations under the premise of the output capacity of the motor being unchanged, which improves the performance of the bearingless PMSM.

Keywords: bearingless PMSM; unequal amplitude modulation; low suspension force ripple; low torque ripple; Taguchi (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: 2022
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