Development of Bipolar-charged Electret Rotatory Power Generator and Application in Self-powered Intelligent Thrust Bearing

Tao, Kai, Zhao, Zhe, Yang, Yang, Wu, Jin, Yunjia, Li, Kangqi, Fan, Fu, Yongqing, Chang, Honglong and Yuan, Weizheng (2021) Development of Bipolar-charged Electret Rotatory Power Generator and Application in Self-powered Intelligent Thrust Bearing. Nano Energy. ISSN 2211-2855 (In Press)

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Abstract

Inspired by an electromagnetic hydropower station that contains a reverse polarized magnet, we proposed a new design methodology of electret rotatory energy harvester (e-REH) with bipolar-charged electrets for boosting its output performance. A selectively localized corona discharging method is invented to have both positive and negative ultra-high-resolution charges implanted into a single electret thin film. A generalized theoretical model of bipolar charged e REHs with free-standing (Fe-REH) and sliding (Se-REH) operation modes is derived to evaluate their performance. The key features affecting their performance are the initial and parasitic capacitances with different connection schemes. Experimental results show that: the output power of the bipolar charged e-REH is increased to 392.2 compared to those of the positive alone and negative alone configurations, which fully agree with those obtained from the theoretical model. For the first time, an intelligent thrust ball bearing is designed and fabricated with its self-powered and self-sensing capabilities based on the bipolar-charged e-REH. The rotation speed of the bearing is characterized by the response frequencies of the output voltage by Fast Fourier Transform instead of the output voltage amplitudes, exhibiting an ultra-high frequency sensitivity of 15.0 rpm/Hz and a good linearity R2 (coefficient of determination) of 99.9. The developed e-REH has potential applications for high-precision and self-powered intelligent rotation-speed sensing.

Item Type: Article
Uncontrolled Keywords: Electret power generator, Energy harvesting, Intelligent thrust bearing, Bipolar electrets, Self-powered sensing
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 06 Sep 2021 09:16
Last Modified: 06 Sep 2021 09:30
URI: http://nrl.northumbria.ac.uk/id/eprint/47072

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