Performance Improvement of Magnetostrictive Vibrational Power Generator by Narrow Gap Structure

Abstract

　In this paper, we propose a magnetostrictive vibrational generator with a narrow air gap, where the volume of permanent magnets used can be greatly reduced by reducing the reluctance of the air gap. We perform theoretical calculations to verify the feasibility of the proposal. The height of the additional frame teeth is continuously adjusted by finite element analysis to maximize the variation of the magnetic flux density. The results show that the variation of magnetic flux density can be significantly improved when the tooth height is 4 mm or 5 mm, with an average increase of 20%. Finally, control experiments were conducted under the same amplitude conditions, and the results confirmed that the enhanced structure achieved a larger flux density variation, leading to higher voltage generation.