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Mathematical Problems in EngineeringVolume 2013 2013, Article ID 369504, 8 pages

Research ArticleDepartment of Mechanical Engineering, National Yunlin University of Science and Technology, Yunlin 640, Taiwan

Received 9 September 2013; Accepted 10 October 2013

Academic Editor: Teen-Hang Meen

Copyright © 2013 Yi-Chang Wu and Zi-Heng Sun. 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.


The aim of this paper is to present an innovative electromechanical device which integrates a brushless DC BLDC hub motor with a speed-changing wheel hub stored on the rear wheel of an electric bicycle. It combines a power source and a speed-changing mechanism to simultaneously provide functions of power generation and transmission for electric bicycles. As part of the proposed integrated device, the wheel hub consists of a basic planetary gear train providing three forward speeds including a low-speed gear, a direct drive, and a high-speed gear. Each gear is manually controlled by the shift control sleeve to selectively engage or disengage four pawl-and-ratchet clutches based on its clutching sequence table. The number of gear teeth of each gear element of the wheel hub is synthesized. The BLDC hub motor is an exterior-rotor-type permanent-magnet synchronous motor. Two-dimensional finite-element analysis FEA software is employed to facilitate the motor design and performance analysis. An analysis of the power transmission path at each gear is provided to verify the validity of the proposed design. The results of this work are beneficial to the embodiment, design, and development of novel electromechanical devices for the power and transmission systems of electric bicycles.

Author: Yi-Chang Wu and Zi-Heng Sun



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