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Open AccessArticle

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

by 1, 2 and 3,*
1
Department of Industrial Engineering, University of Padova, 35131 Padova, Italy
2
Sungshin Precision Global (SPG) Co., Ltd., Incheon 21633, Korea
3
Department of Electrical Engineering, Incheon National University, Incheon 22012, Korea
*
Author to whom correspondence should be addressed.
Energies 2019, 12(20), 3887; https://doi.org/10.3390/en12203887
Received: 29 August 2019 / Revised: 4 October 2019 / Accepted: 11 October 2019 / Published: 14 October 2019
(This article belongs to the Special Issue Advances in Rotating Electric Machines)
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. View Full-Text
Keywords: cogging torque; permanent magnet machine; torque ripple; uneven magnets cogging torque; permanent magnet machine; torque ripple; uneven magnets
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MDPI and ACS Style

Jeong, C.; Lee, D.; Hur, J. Mitigation Method of Slot Harmonic Cogging Torque Considering Unevenly Magnetized Permanent Magnets in PMSM. Energies 2019, 12, 3887. https://doi.org/10.3390/en12203887

AMA Style

Jeong C, Lee D, Hur J. Mitigation Method of Slot Harmonic Cogging Torque Considering Unevenly Magnetized Permanent Magnets in PMSM. Energies. 2019; 12(20):3887. https://doi.org/10.3390/en12203887

Chicago/Turabian Style

Jeong, Chaelim; Lee, Dongho; Hur, Jin. 2019. "Mitigation Method of Slot Harmonic Cogging Torque Considering Unevenly Magnetized Permanent Magnets in PMSM" Energies 12, no. 20: 3887. https://doi.org/10.3390/en12203887

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