10 April 2013 A magnetic/piezoelectric-based thermal energy harvester
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In this paper, we demonstrate a non-contact magnetic/piezoelectric-based thermal energy harvester utilizing an optimized thermal-convection mechanism to enhance the heat transfer in the energy harvesting/converting process in order to increase the power output. The harvester consists of a CuBe spring, Gadolinium soft magnet, NdFeB hard magnets, frame, and piezoelectric PZT cantilever beams. According to the configuration, the energy harvesting/converting process under a temperature-difference is cyclic. Thus, the piezoelectric beams continuously oscillate and subsequently produce voltage responses due to the piezoelectric effect. The maximum voltage response of the harvester under a temperaturedifference of 25°C is 16.6 mV with a cycling frequency of 0.58 Hz. In addition, we compare the testing result of the harvester utilizing the new thermal-convection mechanism reported in this paper and using previous thermal-convection mechanism reported elsewhere. According to the comparison, the results show the harvester utilizing the new thermal-convection mechanism has a higher cycling frequency resulting in a higher power output than the previous mechanism.
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Tien-Kan Chung, Tien-Kan Chung, Ujjwalu Shukla, Ujjwalu Shukla, Chia-Yuan Tseng, Chia-Yuan Tseng, Chin-Chung Chen, Chin-Chung Chen, Chieh-Min Wang, Chieh-Min Wang, } "A magnetic/piezoelectric-based thermal energy harvester", Proc. SPIE 8688, Active and Passive Smart Structures and Integrated Systems 2013, 86880M (10 April 2013); doi: 10.1117/12.2009434; https://doi.org/10.1117/12.2009434

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