Non-contact magnetic cantilever-type piezoelectric energy harvester for rotational mechanism

Abstract

In this work, a piezoelectric energy harvester excited by the magnetic force was proposed and developed for the rotational mechanism applications. The non-contact magnetic force was employed for exciting the piezoelectric cantilever vibration and avoiding power frictional loss. The different directions and configurations of magnetic force, attractive force and repulsive force, were designed and optimized for the piezoelectric energy harvesting system. The different exciting frequencies and duty ratios were carried out by the rotational mechanism for achieving the high power generation. When the exciting frequency approaches the natural frequency of piezoelectric cantilever beam and the duty ratio is larger, the highest power 1.23mW was achieved by the alternate attractive and repulsive magnetic forces.