An Electromagnetic Micro-Power Generator for Low Frequency Vibrations with Tunable Resonance

2011-09-07
This paper presents an electromagnetic (EM) micro-power generator with tunable resonance frequency which can harvest energy from low frequency environmental vibrations. The reported power generator up-converts low frequency environmental vibrations before mechanical-to-electrical energy conversion by utilizing two diaphragms with different resonance frequencies. Power is generated through electromagnetic induction by a magnet attached to the low frequency diaphragm, and a 50 turn, 2.1 Omega coil, and a magnetic piece on the high frequency diaphragm. Both of the diaphragms are fixed to a common frame via rubber springs, which makes the resonance frequency of each diaphragm tunable. The fabricated prototype generates 5.2 mV and 3.21 mu W RMS power by up-converting 13 Hz, 7.5 mm peak-to-peak vibrations to 200 Hz. Tunability of the resonance frequency is experimentally verified by operating the same device at 2-30 Hz external vibrations.

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Citation Formats
S. Türkyılmaz, A. Muhtaroglu, and H. Külah, “An Electromagnetic Micro-Power Generator for Low Frequency Vibrations with Tunable Resonance,” Athens, GREECE, 2011, vol. 25, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40022.