Analytical Methods for Minimizing Cogging Torque in Permanent-Magnet Machines

被引:307
作者
Zhu, Li [2 ]
Jiang, S. Z. [2 ]
Zhu, Z. Q. [1 ]
Chan, C. C. [3 ]
机构
[1] Univ Sheffield, Dept Elect & Elect Engn, Sheffield S1 3JD, S Yorkshire, England
[2] Shanghai Jiao Tong Univ, Dept Elect Engn, Shanghai 200030, Peoples R China
[3] Univ Hong Kong, Dept Elect & Elect Engn, Hong Kong, Hong Kong, Peoples R China
关键词
Cogging torque; energy method; Fourier series; permanent-magnet machines; torque ripple; FIELD DISTRIBUTION; DESIGN TECHNIQUES; ANALYTICAL-MODEL; POLE-ARC; REDUCTION; MOTORS; OPTIMIZATION;
D O I
10.1109/TMAG.2008.2011363
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Cogging torque in permanent-magnet machines causes torque and speed ripples, as well as acoustic noise and vibration, especially in low speed and direct drive applications. In this paper, a general analytical expression for cogging torque is derived by the energy method and the Fourier series analysis, based on the air gap permeance and the flux density distribution in an equivalent slotless machine. The optimal design parameters, such as slot number and pole number combination, skewing, pole-arc to pole-pitch ratio, and slot opening, are derived analytically to minimize the cogging torque. Finally, the finite-element analysis is adopted to verify the correctness of analytical methods.
引用
收藏
页码:2023 / 2031
页数:9
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