Performance Evaluation of an In-Wheel Motor Cooling System in an Electric Vehicle/Hybrid Electric Vehicle

Dong Hyun Lim, Moo-Yeon Lee, Ho-Seong Lee and Sung Chul Kim
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Dong Hyun Lim: Korea Automotive Technology Institute (KATECH), 74 Yongjung-Ri, Pungse-Myun, Dongnam-Gu, Chonan-Si, Chungnam 330-912, Korea
Moo-Yeon Lee: Department of Mechanical Engineering, Dong-A University, 37 Nakdong-Daero 550, Saha-Gu, Busan 604-714, Korea
Ho-Seong Lee: Korea Automotive Technology Institute (KATECH), 74 Yongjung-Ri, Pungse-Myun, Dongnam-Gu, Chonan-Si, Chungnam 330-912, Korea
Sung Chul Kim: Korea Automotive Technology Institute (KATECH), 74 Yongjung-Ri, Pungse-Myun, Dongnam-Gu, Chonan-Si, Chungnam 330-912, Korea

Energies, 2014, vol. 7, issue 2, 1-11

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 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2014
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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