Torque Ripple Optimization of a Novel Cylindrical Arc Permanent Magnet Synchronous Motor Used in a Large Telescope

Shuhua Fang, Songhan Xue, Zhenbao Pan, Hui Yang and Heyun Lin
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Shuhua Fang: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Songhan Xue: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Zhenbao Pan: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Hui Yang: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Heyun Lin: School of Electrical Engineering, Southeast University, Nanjing 210096, China

Energies, 2019, vol. 12, issue 3, 1-15

Abstract: This paper proposes the use of a novel cylindrical arc permanent magnet synchronous motor (CAPMSM) in a large telescope, which requires high positioning accuracy and low torque ripple. A 2D finite element method was used to analyze the cogging torque of the CAPMSM. The CAPMSM can be an alternative for a rotating motor to realize direct drive. A new method is proposed to separate the cogging torque, T cog , into the torque, T slot , generated by the slotted effect and the end torque, T end , generated by the end effect. The average torque and the torque ripple are optimized considering stator center angle, the angle between two adjacent stators and the unequal thickness of a Halbach permanent magnet. The torque ripple decreased from 31.73% to 1.17%, which can satisfy the requirement of tracking accuracy for large telescopes.

Keywords: cylindrical arc permanent magnet synchronous motor; Halbach permanent magnet; torque ripple (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: 2019
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