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Energies 2014, 7(2), 961-971; doi:10.3390/en7020961
Article

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

1
, 2
, 1
 and 1,*
1 Korea Automotive Technology Institute (KATECH), 74 Yongjung-Ri, Pungse-Myun, Dongnam-Gu, Chonan-Si, Chungnam 330-912, Korea 2 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 / Revised: 22 January 2014 / Accepted: 14 February 2014 / Published: 21 February 2014
(This article belongs to the Special Issue Advances in Hybrid Vehicles)
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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 electric vehicle; in-wheel motor; oil-cooling system; radiator; thermal performance
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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.

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