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Torque Ripple Minimizing of Uniform Slot Machines with Delta Rotor via Subdomain Analysis

Author

Listed:
  • Minhyeok Lee

    (Department of Electrical Engineering, Pohang University of Science and Technology, 77 Cheongam-ro, Nam-gu, Pohang 37673, Gyeongbuk, Korea)

  • Yunkyung Hwang

    (Department of Electrical Engineering, Pohang University of Science and Technology, 77 Cheongam-ro, Nam-gu, Pohang 37673, Gyeongbuk, Korea)

  • Kwanghee Nam

    (Department of Electrical Engineering, Pohang University of Science and Technology, 77 Cheongam-ro, Nam-gu, Pohang 37673, Gyeongbuk, Korea)

Abstract

Since the slot opening is large in the uniform slot machine, the torque ripple generated by overlapping or misaligning with the rotor cavity is remarkably large in the case of interior permanent magnet (IPM) machine. In this work, it is observed that the magnitude of torque ripple depends strongly on the phase difference between air-gap field harmonics: The ripple is minimized when the two dominant harmonic components cancel each other. Based on this fact, a condition is developed to minimize torque ripple by adjusting the q -flux channel width and d -flux barrier width. The torque ripple minimizing solution is found from a level chart made by subdomain time-stepping analysis. Finite element analysis (FEA) also gives a very similar minimizing solution. A prototype machine is manufactured, and its performances are validated through experiments.

Suggested Citation

  • Minhyeok Lee & Yunkyung Hwang & Kwanghee Nam, 2021. "Torque Ripple Minimizing of Uniform Slot Machines with Delta Rotor via Subdomain Analysis," Energies, MDPI, vol. 14(21), pages 1-18, November.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:7390-:d:673159
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    References listed on IDEAS

    as
    1. Myeong-Hwan Hwang & Jong-Ho Han & Dong-Hyun Kim & Hyun-Rok Cha, 2018. "Design and Analysis of Rotor Shapes for IPM Motors in EV Power Traction Platforms," Energies, MDPI, vol. 11(10), pages 1-12, September.
    2. Myeong-Hwan Hwang & Hae-Sol Lee & Se-Hyeon Yang & Gye-Seong Lee & Jong-Ho Han & Dong-Hyun Kim & Hyeon-Woo Kim & Hyun-Rok Cha, 2019. "Cogging Torque Reduction and Offset of Dual-Rotor Interior Permanent Magnet Motor in Electric Vehicle Traction Platforms," Energies, MDPI, vol. 12(9), pages 1-14, May.
    3. Benedikt Groschup & Florian Pauli & Kay Hameyer, 2021. "Influence of the Preformed Coil Design on the Thermal Behavior of Electric Traction Machines," Energies, MDPI, vol. 14(4), pages 1-16, February.
    4. Myeong-Hwan Hwang & Hae-Sol Lee & Hyun-Rok Cha, 2018. "Analysis of Torque Ripple and Cogging Torque Reduction in Electric Vehicle Traction Platform Applying Rotor Notched Design," Energies, MDPI, vol. 11(11), pages 1-14, November.
    5. Hyungkwan Jang & Hyunwoo Kim & Huai-Cong Liu & Ho-Joon Lee & Ju Lee, 2021. "Investigation on the Torque Ripple Reduction Method of a Hybrid Electric Vehicle Motor," Energies, MDPI, vol. 14(5), pages 1-13, March.
    Full references (including those not matched with items on IDEAS)

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