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A Nonlinear Suspended Energy Harvester for a Tire Pressure Monitoring System
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Micromachines 2015, 6(3), 375-389; doi:10.3390/mi6030375

Design of a Weighted-Rotor Energy Harvester Based on Dynamic Analysis and Optimization of Circular Halbach Array Magnetic Disk

1
Department of Mechanical and Electromechanical Engineering, National Sun Yat-sen University, No. 70 Lienhai Rd., Kaohsiung 80424, Taiwan
2
Nuvoton Technology Corporation, No. 4, Creation Rd., Hsinchu Science Park 30077, Taiwan
3
Department of Mechanical Engineering, National Taipei University of Technology, No. 1, Sec. 3, Zhongxiao E. Rd., Taipei 10608, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Paul Ronney
Received: 26 December 2014 / Revised: 15 March 2015 / Accepted: 18 March 2015 / Published: 23 March 2015
(This article belongs to the Special Issue Power MEMS)
View Full-Text   |   Download PDF [2625 KB, uploaded 23 March 2015]   |  

Abstract

This paper proposes the design of a weighted-rotor energy harvester (WREH) in which the oscillation is caused by the periodic change of the tangential component of gravity, to harvest kinetic energy from a rotating wheel. When a WREH is designed with a suitable characteristic length, the rotor’s natural frequency changes according to the wheel rotation speed and the rotor oscillates at a wide angle and high angular velocity to generate a large amount of power. The magnetic disk is designed according to an optimized circular Halbach array. The optimized circular Halbach array magnetic disk provides the largest induced EMF for different sector-angle ratios for the same magnetic disk volume. This study examined the output voltage and power by considering the constant and accelerating plate-rotation speeds, respectively. This paper discusses the effects of the angular acceleration speed of a rotating wheel corresponding to the dynamic behaviors of a weighted rotor. The average output power is 399 to 535 microwatts at plate-rotation speeds from 300 to 500 rpm, enabling the WREH to be a suitable power source for a tire-pressure monitoring system. View Full-Text
Keywords: weighted-rotor energy harvester; natural frequency; optimization of Halbach array; tire-pressure monitoring system weighted-rotor energy harvester; natural frequency; optimization of Halbach array; tire-pressure monitoring system
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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MDPI and ACS Style

Wang, Y.-J.; Hao, Y.-T.; Lin, H.-Y. Design of a Weighted-Rotor Energy Harvester Based on Dynamic Analysis and Optimization of Circular Halbach Array Magnetic Disk. Micromachines 2015, 6, 375-389.

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