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World Electric Vehicle Journal is published by MDPI from Volume 9 issue 1 (2018). Articles in this Issue were published by The World Electric Vehicle Association (WEVA) and its member the European Association for e-Mobility (AVERE), the Electric Drive Transportation Association (EDTA), and the Electric Vehicle Association of Asia Pacific (EVAAP). They are hosted by MDPI on as a courtesy and upon agreement with AVERE.
Open AccessArticle

Weight Reduction Design of In-Wheel type Motor For Power density Improvement

Department of Automotive Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Korea
Author to whom correspondence should be addressed.
World Electr. Veh. J. 2012, 5(2), 550-555;
Published: 29 June 2012
PDF [2849 KB, uploaded 17 May 2018]


This paper deals with the weight reduction design of In-Wheel type motor for high power density. Accordingly, characteristic and weight of the motor caused by modifying reduction gear ratio are examined. Weight of motor is minimized by modulating the ratio of stack length and external diameter of stator. Then, In-Wheel motor geometry based on the prototype is optimized to get the determined parameters using response surface methodology (RSM) and Finite Element Method (FEM). Optimal design of core usage in rotor is conducted for minimizing weight of motor which has identical characteristic to the prototype. Characteristic analysis is conducted by using equivalent circuit analysis of PM type motor. Through the presented weight of In-Wheel type motor, total weight is reduced to 25%, and power density is improved to 57% from the prototype motor.
Keywords: IPMSM, in-wheel; weight reduction; gear ratio; power density IPMSM, in-wheel; weight reduction; gear ratio; power density
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 (CC BY 4.0).

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Chai, S.-H.; Lee, B.-H.; Hong, J.-P. Weight Reduction Design of In-Wheel type Motor For Power density Improvement. World Electr. Veh. J. 2012, 5, 550-555.

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