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Design Optimization and Analysis of an Outer-Rotor Direct-Drive Permanent-Magnet Motor for Medium-Speed Electric Vehicle

1
School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China
2
Great Wall Motor Company Limited, Baoding 071000, China
*
Author to whom correspondence should be addressed.
World Electr. Veh. J. 2019, 10(2), 16; https://doi.org/10.3390/wevj10020016
Received: 18 February 2019 / Revised: 19 March 2019 / Accepted: 20 March 2019 / Published: 4 April 2019

Abstract

At present, it is the conventional inner rotor motor instead of the internal combustion engine that is adopted by most electric cars. However, compared to the traditional centralized driving pattern, cars adopting a distributed direct driving pattern have higher drive efficiency and more stable handling. Given this background, a kind of direct-drive outer rotor motor with 40 poles and 42 slots applied for middle or low speed electric cars was designed. The core of this study included the electromagnetic analysis and structural design of the motor. Firstly, the material and dimension parameters of the stator and rotor were selected and calculated by the traditional method. The air-gap length and pole-arc coefficient were optimized using an RMxprt module, which was developed using the equivalent magnetic circuit method. Then, a two-dimensional finite-element model was established using ANSYS Maxwell. The magnetic field and torque characteristics of the model were then analyzed. Results show that the design of the motor is reasonable. In addition, a method for reducing the torque ripple was proposed and verified by simulation. View Full-Text
Keywords: outer rotor; direct-drive brushless DC motor; structural design; electromagnetic analysis; torque ripple outer rotor; direct-drive brushless DC motor; structural design; electromagnetic analysis; torque ripple
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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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Yuan, Y.; Meng, W.; Sun, X.; Zhang, L. Design Optimization and Analysis of an Outer-Rotor Direct-Drive Permanent-Magnet Motor for Medium-Speed Electric Vehicle. World Electr. Veh. J. 2019, 10, 16.

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