Analysis of Torque Ripple of a Spoke-Type Interior Permanent Magnet Machine

Guoyu Chu, Rukmi Dutta, Alireza Pouramin and Muhammed Fazlur Rahman
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Guoyu Chu: School of Electrical Engineering and Telecommunications, UNSW Sydney, Kensington, NSW 2033, Australia
Rukmi Dutta: School of Electrical Engineering and Telecommunications, UNSW Sydney, Kensington, NSW 2033, Australia
Alireza Pouramin: School of Electrical Engineering and Telecommunications, UNSW Sydney, Kensington, NSW 2033, Australia
Muhammed Fazlur Rahman: School of Electrical Engineering and Telecommunications, UNSW Sydney, Kensington, NSW 2033, Australia

Energies, 2020, vol. 13, issue 11, 1-16

Abstract: This paper investigates the theoretical reasons behind the low torque ripple of a fractional-slot concentrated-winding (FSCW) spoke-type interior permanent-magnet (IPM) machine obtained via a genetic algorithm-based optimization. To better understand the torque performance of the IPMM, this paper uses the frozen permeability method to segregate the overall torque into four components—magnet torque, reluctance torque, cogging torque, and the torque caused by cross-magnetization. Equations and detailed procedures of the torque separation method are discussed in the paper. Analysis of the separated torque components reveals that the counteraction between ripples of different torques leads to the low torque ripple. At high-load conditions, the magnetic saturation alters the torque ripples caused by cross-magnetization to offset ripples of other components resulting in minimization of the overall torque ripple. A detailed parametric analysis of the geometric parameters was carried out to understand their effect in producing minimum torque ripple in the optimized design. In the end, a prototype was built and used for the verification of the torque separation method and the analytical findings based on it.

Keywords: FSCW; frozen permeability; finite element; IPMSM; spoke-type; torque separation; torque ripple reduction (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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