Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Thermal Characteristics of Oil-cooled In-wheel Motor in Electric Vehicles

전기자동차용 유냉식 인휠 모터의 방열 특성 연구

  • Lim, Dong Hyun (Green Car Power System R&D Division, Korea Automotive Technology Institute) ;
  • Kim, Sung Chul (Green Car Power System R&D Division, Korea Automotive Technology Institute)
  • 임동현 (자동차부품연구원 그린카파워시스템연구본부) ;
  • 김성철 (자동차부품연구원 그린카파워시스템연구본부)
  • Received : 2013.09.12
  • Accepted : 2014.03.14
  • Published : 2014.07.01
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Abstract

Cooling the in-wheel motor in electric vehicles is critical to its performance and durability. In this study, thermal flow analysis was conducted by evaluating the thermal performance of two conventional cooling models for in-wheel motors under the continuous rating base speed condition. For conventional model #1, in which cooling oil was stagnant in the lower end of the motor, the maximum temperature of the coil was $221.7^{\circ}C$; for conventional model #2, in which cooling oil was circulated through the exit and entrance of the housing and jig, the maximum temperature of the coil was $155.4^{\circ}C$. Therefore, both models proved unsuitable for in-wheel motors since the motor control specifications limited the maximum temperature to $150^{\circ}C$.

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References

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