Diagnosis and Robust Design Optimization of SPMSM Considering Back EMF and Cogging Torque due to Static Eccentricity

Jin-Cheol Park, Soo-Hwan Park, Jae-Hyun Kim, Soo-Gyung Lee, Geun-Ho Lee and Myung-Seop Lim
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Jin-Cheol Park: Department of Automotive Engineering, Hanyang University, Seoul 04763, Korea
Soo-Hwan Park: Department of Automotive Engineering, Hanyang University, Seoul 04763, Korea
Jae-Hyun Kim: Department of Automotive Engineering, Hanyang University, Seoul 04763, Korea
Soo-Gyung Lee: Steel Solution R&D Center, Posco, Incheon 21985, Korea
Geun-Ho Lee: Electric Motor Control Laboratory, Graduate School of Automotive Engineering, Kookmin University, Seoul 02707, Korea
Myung-Seop Lim: Department of Automotive Engineering, Hanyang University, Seoul 04763, Korea

Energies, 2021, vol. 14, issue 10, 1-19

Abstract: Static eccentricity (SE) is frequently generated by manufacturing processes. As the nonuniformity of the air-gap length is caused by the SE, the torque ripple and cogging torque increase in the motor. This study analyzes the distorted back electromotive force (EMF) and cogging torque due to SE. Further, a motor design considering SE is performed for stable back EMF and low cogging torque. First, the SE was diagnosed and analyzed using the back EMF and cogging torque measured from the test results of the base model. In addition, the rotor position was calculated using the unbalanced back EMF due to the SE. The calculated rotor position is used when analyzing phenomena due to SE and applied to robust design. Subsequently, robust design optimization was performed to improve the unbalanced back EMF and cogging torque due to SE. Using finite element analysis (FEA) considering SE, the shape of the stator was designed based on the base model. The estimated rotor position from the base model was applied to the optimum model to confirm its robustness from SE’s effects. Finally, the base and optimum models were compared through the test results.

Keywords: back electromotive force; cogging torque; robust design optimization; static eccentricity (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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