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The Effects of Permanent Magnet Segmentations on Electromagnetic Performance in Ironless Brushless DC Motors

Author

Listed:
  • Fugang Zhai

    (School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China)

  • Liu Yang

    (School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
    School of Automation, Beijing Institute of Technology, Beijing 100081, China)

  • Wenqi Fu

    (Beijing Institute of Aerospace Control Devices, Beijing 100039, China)

  • Haisheng Tong

    (Inner Mongolia North Heavy Industries Group CORP.LTD, NORINCO GROUP, Baotou 014033, China)

  • Tianyu Zhao

    (NO. 703 Research Institute of China State Shipbuilding Company Limited, Harbin 150001, China)

Abstract

This paper investigates the electromagnetic torque by considering back electromagnetic force (back-EMF) trapezoidal degrees of ironless brushless DC (BLDC) motors through the two-dimensional finite element method (2-D FEM). First, the change percentages of the electromagnetic torque with back-EMF trapezoidal degrees, relative to those of PMs without segments, are investigated on the premise of the same back-EMF amplitude. It is found that both PM symmetrically and asymmetrically segmented types influence back-EMF trapezoidal degrees. Second, the corresponding electromagnetic torque, relative to that of PMs without segments, is studied in detail. The results show that the electromagnetic torque can be improved or deteriorated depending on whether the back-EMF trapezoidal degree is lower or higher than that of PMs without segments. Additionally, the electromagnetic torque can easily be improved by increasing the number of PMs’ symmetrical segments. In addition, the electromagnetic torque in PMs with asymmetrical segments is always higher than that of PMs without segments. Finally, two ironless PM BLDC motors with PMs symmetrically segmented into three segments and without segments are manufactured and tested. The experimental results show good agreement with those of the 2-D FEM method. This approach provides significant guidelines to electromagnetic torque improvement without much increase in manufacturing costs and process complexity.

Suggested Citation

  • Fugang Zhai & Liu Yang & Wenqi Fu & Haisheng Tong & Tianyu Zhao, 2022. "The Effects of Permanent Magnet Segmentations on Electromagnetic Performance in Ironless Brushless DC Motors," Energies, MDPI, vol. 15(2), pages 1-18, January.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:2:p:621-:d:726093
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    References listed on IDEAS

    as
    1. Byeong-Chul Lee & Cheon-Ho Song & Do-Hyun Kim & Ki-Chan Kim, 2020. "Study on Process Derivation and Characteristic Analysis for BLDC Motor Design Using Dual Rotor Structure with High Torque Density," Energies, MDPI, vol. 13(24), pages 1-9, December.
    2. Myeong-Hwan Hwang & Hae-Sol Lee & Se-Hyeon Yang & Hyun-Rok Cha & Sung-Jun Park, 2019. "Electromagnetic Field Analysis and Design of an Efficient Outer Rotor Inductor in the Low-Speed Section for Driving Electric Vehicles," Energies, MDPI, vol. 12(24), pages 1-19, December.
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    4. Keun-Young Yoon & Soo-Whang Baek, 2019. "Robust Design Optimization with Penalty Function for Electric Oil Pumps with BLDC Motors," Energies, MDPI, vol. 12(1), pages 1-14, January.
    5. Mariusz Korkosz & Jan Prokop & Bartlomiej Pakla & Grzegorz Podskarbi & Piotr Bogusz, 2020. "Analysis of Open-Circuit Fault in Fault-Tolerant BLDC Motors with Different Winding Configurations," Energies, MDPI, vol. 13(20), pages 1-27, October.
    6. Chengyuan He & Thomas Wu, 2018. "Permanent Magnet Brushless DC Motor and Mechanical Structure Design for the Electric Impact Wrench System," Energies, MDPI, vol. 11(6), pages 1-24, May.
    7. T. A. Anuja & M. Arun Noyal Doss, 2021. "Reduction of Cogging Torque in Surface Mounted Permanent Magnet Brushless DC Motor by Adapting Rotor Magnetic Displacement," Energies, MDPI, vol. 14(10), pages 1-20, May.
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