Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 51, Issue 11, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2015.2437892
Keywords
Dual Halbach arrays; electromagnetic; vibration energy harvester
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In this paper, an electromagnetic vibration energy harvester (EVEH) with dual Halbach arrays is presented based on the Faraday's law of electromagnetic induction. A Halbach array is a specific arrangement of permanent magnets which could concentrate the magnetic field on one side while reducing the field to almost zero on the opposite side. This array could increase the magnetic field intensity and improve the electromagnetic coupling. The experimental results show that the output performance of the presented harvester is optimal when the height of the coil equals to the sum thickness of two adjacent magnets in the array. An optimal output power density is 1.39 mW/cm(3) at a resonant frequency of 11.20 Hz with an acceleration of 0.5 g (with g = 9.8 m/s(2)) across a 20 mm-high and 1600-turn coil. When other conditions are kept constant, the output power density is proportional to the length of the cantilever. The EVEH based on dual Halbach arrays can increase the output power density and minimize the overall volume, which is beneficial for improving the practical application.
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