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PERFORMANCE ENHANCEMENT OF VIBRATION-BASED ELECTROMAGNETIC ENERGY HARVESTER DUE TO REDUCED AIR DAMPING
This work presents on the performance enhancement of vibration-based electromagnetic energy harvesters (EMEHs)due to reduced air damping. Fabrication and characterization of Copper foil-type EMEH-l and polydimethylsiloxane(PDMS) membrane type EMEH-2 under vacuum and without vacuum pressures are reported. The harvesters aresubjected to harmonic excitation with constant acceleration frequency-sweeps. In the developed energy harvesters,the air damping is decreased by generating vacuum pressure in the cavity where the magnets are oscillating. Undera pressure of 93 kPa and when excited at an acceleration of 13.5 g and resonant frequency of 371 Hz, in EMEH-l,the load voltage and load power delivered to a load resistance of 1000 increases from 46.3 to 79.4 mV and from10.9 to 24.1 fJ-W respectively. However, at optimum load condition (7.5 0) and at resonant frequency, 48.6 % and122 % improvement in load voltage and load power respectively is obtained. With and without vacuum pressures,EMEH-2 exhibits nonlinear behaviour at 3 g acceleration level. When connected to 1000 load and excited at 3 gacceleration, under vacuum pressure the EMEH-2 produces 37.6 mVmore load voltage and 39 fJ-W more load power.Moreover, at optimum load condition (10.1 0) and under vacuum pressure, the harvester produces a maximum loadvoltage of 68 mV and load power of 231 fJ- w: The reduced air damping provides a maximum improvement of 124 %and 107.6 % in power densities for EMEH-l and EMEH-2 respectively.
PERFORMANCE ENHANCEMENT OF VIBRATION-BASED ELECTROMAGNETIC ENERGY HARVESTER DUE TO REDUCED AIR DAMPING
This work presents on the performance enhancement of vibration-based electromagnetic energy harvesters (EMEHs)due to reduced air damping. Fabrication and characterization of Copper foil-type EMEH-l and polydimethylsiloxane(PDMS) membrane type EMEH-2 under vacuum and without vacuum pressures are reported. The harvesters aresubjected to harmonic excitation with constant acceleration frequency-sweeps. In the developed energy harvesters,the air damping is decreased by generating vacuum pressure in the cavity where the magnets are oscillating. Undera pressure of 93 kPa and when excited at an acceleration of 13.5 g and resonant frequency of 371 Hz, in EMEH-l,the load voltage and load power delivered to a load resistance of 1000 increases from 46.3 to 79.4 mV and from10.9 to 24.1 fJ-W respectively. However, at optimum load condition (7.5 0) and at resonant frequency, 48.6 % and122 % improvement in load voltage and load power respectively is obtained. With and without vacuum pressures,EMEH-2 exhibits nonlinear behaviour at 3 g acceleration level. When connected to 1000 load and excited at 3 gacceleration, under vacuum pressure the EMEH-2 produces 37.6 mVmore load voltage and 39 fJ-W more load power.Moreover, at optimum load condition (10.1 0) and under vacuum pressure, the harvester produces a maximum loadvoltage of 68 mV and load power of 231 fJ- w: The reduced air damping provides a maximum improvement of 124 %and 107.6 % in power densities for EMEH-l and EMEH-2 respectively.
PERFORMANCE ENHANCEMENT OF VIBRATION-BASED ELECTROMAGNETIC ENERGY HARVESTER DUE TO REDUCED AIR DAMPING
Khan, Farid Ullah (author)
2014-06-30
JOURNAL OF ENGINEERING AND APPLIED SCIENCES; Vol 33 No 1 (2014): Journal of Engineering and Applied Sciences (JEAS); 45-54 ; 2518-4571 ; 1023-862X ; 10.25211/jeas.v33i1
Article (Journal)
Electronic Resource
English
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