Mitigation Method of Slot Harmonic Cogging Torque Considering Unevenly Magnetized Permanent Magnets in PMSM

Chaelim Jeong, Dongho Lee and Jin Hur
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Chaelim Jeong: Department of Industrial Engineering, University of Padova, 35131 Padova, Italy
Dongho Lee: Sungshin Precision Global (SPG) Co., Ltd., Incheon 21633, Korea
Jin Hur: Department of Electrical Engineering, Incheon National University, Incheon 22012, Korea

Energies, 2019, vol. 12, issue 20, 1-15

Abstract: This paper presents a mitigation method of slot harmonic cogging torque considering unevenly magnetized magnets in a permanent magnet synchronous motor. In previous studies, it has been confirmed that non-uniformly magnetized permanent magnets cause an unexpected increase of cogging torque because of additional slot harmonic components. However, these studies did not offer a countermeasure against it. First, in this study, the relationship between the residual magnetic flux density of the permanent magnet and the cogging torque is derived from the basic form of the Maxwell stress tensor equation. Second, the principle of the slot harmonic cogging torque generation is explained qualitatively, and the mitigation method of the slot harmonic component is proposed. Finally, the proposed method is verified with the finite element analysis and experimental results.

Keywords: cogging torque; permanent magnet machine; torque ripple; uneven magnets (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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