Investigation on the Torque Ripple Reduction Method of a Hybrid Electric Vehicle Motor

Hyungkwan Jang, Hyunwoo Kim, Huai-Cong Liu, Ho-Joon Lee and Ju Lee
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Hyungkwan Jang: Department of Electrical Engineering, Hanyang University, Seoul 04763, Korea
Hyunwoo Kim: Department of Electrical Engineering, Hanyang University, Seoul 04763, Korea
Huai-Cong Liu: EPS Engineering Design Team, Hyundai Transys, Hwaseong 18280, Korea
Ho-Joon Lee: Division of Converged Electronic Engineering, Cheongju University, Cheongju 28503, Korea
Ju Lee: Department of Electrical Engineering, Hanyang University, Seoul 04763, Korea

Energies, 2021, vol. 14, issue 5, 1-13

Abstract: Owing to the development of electric vehicles (EVs), research and development are underway to minimize torque ripple in relation to vibration and noise in EV motors. Although there are various ways to reduce torque ripple, this study analyzes the torque ripple, cogging torque, total harmonic distortion (THD), and magnetic flux density distribution for the three rotor shapes of interior permanent magnet synchronous motors, which are widely employed in EVs. To reduce the torque ripple while retaining the required average torque, the barrier shape is optimized, and wedge skew is applied. First, regarding the rotor barrier shape, torque ripple is primarily reduced by designing the rotor barrier shape with the response surface method, which is an experimental design method. Additionally, the wedge skew shape considering the bidirectional rotation and fabrication was applied to the stator shoe as a step and analyzed using three-dimensional finite element analysis. When designing the wedge skew, the layer subdivision according to the axial length, wedge skew diameter, and wedge skew position was analyzed and improved. The torque ripple reduction method in this paper can be applied not only to motors for EVs or Hybrid EVs (HEVs) but also all types of permanent magnet synchronous motors.

Keywords: torque ripple; cogging torque; interior permanent magnet synchronous motors; total harmonic distortion; electric vehicle; magnetic flux density saturation (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 (2)

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