Design and Evaluation of a Novel Double Torque-Driven Piezoelectric-Electromagnetic Energy Harvester

Abstract

In this paper, a double torque-driven piezoelectric-electromagnetic energy harvester is proposed. Two PEHs (Piezoelectric energy harvester) and EMHs (Electro-magnetic energy harvester) are combined into the prototype. A see-saw structure is cleverly combined with magnetism to achieve a double torque drive action. The effect of the number of rotor cams and the diameter and number of magnets on the experiment were analyzed, the prototype reaches its optimum output when the number of cams was 3 and the pole arrangement was NSNS-NS. The magnetic pole arrangement of the NSNS-NS provides a skillful mating of the magnets, the see-saw structure is subjected to a double torque drive, the prototype has faster response and higher output. Under load, compared with the single-torque harvester, the double-torque driven energy harvester exhibits a 19% and 25% increase in maximum output power and voltage, with maximum power output power at 5.76 mW. The protype can successfully illuminate 60 LEDs, it provides a new viable option for future energy harvesting and efficiency.

Keywords: Piezoelectric-electromagnetic, Double torque, Hybrid harvester, Rotation See-saw