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Performance Evaluation of an In-Wheel Motor Cooling System in an Electric Vehicle/Hybrid Electric Vehicle
Korea Automotive Technology Institute (KATECH), 74 Yongjung-Ri, Pungse-Myun, Dongnam-Gu, Chonan-Si, Chungnam 330-912, Korea
Department of Mechanical Engineering, Dong-A University, 37 Nakdong-Daero 550, Saha-Gu, Busan 604-714, Korea
* Author to whom correspondence should be addressed.
Received: 6 November 2013; in revised form: 22 January 2014 / Accepted: 14 February 2014 / Published: 21 February 2014
Abstract: High power and miniaturization of motors in an in-wheel drive system, which is installed inside the wheels of a vehicle, are required for directly driving the wheels. In addition, an efficient cooling system is required to ensure high driving performance and durability. This study experimentally evaluated the heat dissipation performance of a 35-kW-class large-capacity in-wheel motor equipped with an internal-circulation-type oil-cooling system that exhibits high cooling performance and can be easily miniaturized to this motor. Temperatures of the coil and stator core of cooling systems with and without a radiator were measured in real time under in-wheel motor driving conditions. It was found that operating the cooling system at a continuous-rating maximum speed without the radiator was difficult. We confirmed that under continuous-rating base speed and continuous-rating maximum speed driving conditions, the cooling system with the radiator showed thermally stable operation. Furthermore, under maximum-rating base speed and maximum-rating maximum speed driving conditions, the cooling system with the radiator provided additional driving times of approximately 22 s and 2 s, respectively.
Keywords: electric vehicle; in-wheel motor; oil-cooling system; radiator; thermal performance
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MDPI and ACS Style
Lim, D.H.; Lee, M.-Y.; Lee, H.-S.; Kim, S.C. Performance Evaluation of an In-Wheel Motor Cooling System in an Electric Vehicle/Hybrid Electric Vehicle. Energies 2014, 7, 961-971.
Lim DH, Lee M-Y, Lee H-S, Kim SC. Performance Evaluation of an In-Wheel Motor Cooling System in an Electric Vehicle/Hybrid Electric Vehicle. Energies. 2014; 7(2):961-971.
Lim, Dong H.; Lee, Moo-Yeon; Lee, Ho-Seong; Kim, Sung C. 2014. "Performance Evaluation of an In-Wheel Motor Cooling System in an Electric Vehicle/Hybrid Electric Vehicle." Energies 7, no. 2: 961-971.