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Temperature Field Accurate Modeling and Cooling Performance Evaluation of Direct-Drive Outer-Rotor Air-Cooling In-Wheel Motor

Author

Listed:
  • Feng Chai

    (State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China
    Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Yue Tang

    (State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China
    Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Yulong Pei

    (State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China
    Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Peixin Liang

    (State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China
    Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Hongwei Gao

    (Shanghai MOONS’ Electric Co., Ltd., Shanghai 201107, China)

Abstract

High power density outer-rotor motors commonly use water or oil cooling. A reasonable thermal design for outer-rotor air-cooling motors can effectively enhance the power density without the fluid circulating device. Research on the heat dissipation mechanism of an outer-rotor air-cooling motor can provide guidelines for the selection of the suitable cooling mode and the design of the cooling structure. This study investigates the temperature field of the motor through computational fluid dynamics (CFD) and presents a method to overcome the difficulties in building an accurate temperature field model. The proposed method mainly includes two aspects: a new method for calculating the equivalent thermal conductivity (ETC) of the air-gap in the laminar state and an equivalent treatment to the thermal circuit that comprises a hub, shaft, and bearings. Using an outer-rotor air-cooling in-wheel motor as an example, the temperature field of this motor is calculated numerically using the proposed method; the results are experimentally verified. The heat transfer rate (HTR) of each cooling path is obtained using the numerical results and analytic formulas. The influences of the structural parameters on temperature increases and the HTR of each cooling path are analyzed. Thereafter, the overload capability of the motor is analyzed in various overload conditions.

Suggested Citation

  • Feng Chai & Yue Tang & Yulong Pei & Peixin Liang & Hongwei Gao, 2016. "Temperature Field Accurate Modeling and Cooling Performance Evaluation of Direct-Drive Outer-Rotor Air-Cooling In-Wheel Motor," Energies, MDPI, vol. 9(10), pages 1-17, October.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:10:p:818-:d:80465
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    References listed on IDEAS

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    1. Moo-Yeon Lee & Dong Hyun Lim & Sung Chul Kim, 2015. "Evaluation of the Effect of Operating Parameters on Thermal Performance of an Integrated Starter Generator in Hybrid Electric Vehicles," Energies, MDPI, vol. 8(8), pages 1-19, August.
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    Cited by:

    1. Dewei Tang & Hong Xiao & Fanrui Kong & Zongquan Deng & Shengyuan Jiang & Qiquan Quan, 2017. "Thermal Analysis of the Driving Component Based on the Thermal Network Method in a Lunar Drilling System and Experimental Verification," Energies, MDPI, vol. 10(3), pages 1-17, March.
    2. Zabdur Rehman & Kwanjae Seong, 2018. "Three-D Numerical Thermal Analysis of Electric Motor with Cooling Jacket," Energies, MDPI, vol. 11(1), pages 1-15, January.
    3. Dmytro Konovalov & Ignat Tolstorebrov & Trygve Magne Eikevik & Halina Kobalava & Mykola Radchenko & Armin Hafner & Andrii Radchenko, 2023. "Recent Developments in Cooling Systems and Cooling Management for Electric Motors," Energies, MDPI, vol. 16(19), pages 1-31, October.

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    1. Zabdur Rehman & Kwanjae Seong, 2018. "Three-D Numerical Thermal Analysis of Electric Motor with Cooling Jacket," Energies, MDPI, vol. 11(1), pages 1-15, January.

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