Open AccessA Compact Electromagnetic Vibration Energy Harvester with High Output Voltage
Author(s) -
Xingchang Wang,
XiaoTing He,
Kankan Li,
Senlin Jiang
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1407/1/012111
Subject(s) - vibration , voltage , materials science , resistor , power density , acoustics , magnet , excitation , electrical engineering , nuclear magnetic resonance , power (physics) , physics , engineering , quantum mechanics
Non-resonant vibration energy harvesters (VEHs) attract much attention for the excellent performance in scavenging ambient low-frequency and broadband vibrations. In this paper, effects of the mild steel sheets, thicknesses of the magnets and coils, wire diameter of coils, and inner dimension of the coils on the outputs of a non-resonant electromagnetic vibration energy harvester (EMVEH) were simulated and the optimized geometries was obtained. Numerical simulations show that the mild steel sheets can enlarge the magnetic flux density about 25.0%, agreeing well with the experimental result that the output voltage increased about 29.3%. Under a base excitation of 0.3 g (where 1g = 9.8 m s −2 ) at 8.3 Hz, the RMS voltage across a 10.4 kΩ resistor of an EMVEH prototype, with the inner volume of 76.26 cm 3 , is about 15.53 V. The power density is about 304 µW cm −3 , about 18.7% higher than the previous device.