New Electromechanical Coupling Model and Optimization of an Electromagnetic Energy Harvester

Abstract

This paper presents a new electro-mechanical-magnetic coupling model. The magnetic field distribution was calculated based on the magnetic dipole model. The coupling model was combining the beam bending vibration theory and Faraday's law. The solutions for response amplitude and output power of the harvester were derived. An experimental system was built up to verify numerical simulation. The influences of external load and gap between magnet and coil were analyzed and optimized. It shows that the experimental results are in good accordance with the theoretical analysis. The maximum power output of this device was 5.657 mW at 33 Hz.