Design and Analysis of Electromagnetic Energy Harvester for Improvising Harvester Potential

Abstract

Present work deals with design and analysis of an electromagnetic energy harvesting system by improving the resonance frequency band using nonlinear stiffness and parametric damping effects. A very few research is available on the energy harvesting capacity of the nonlinear system. Initially the effect of parametric damping, nonlinear stiffness on the output current are studied using a lumped-parameter model. Coupled differential equations are solved and the results are interpreted. It was found that nonlinearities present in the system can be effectively used to increase the output power. Also a system with dual objective of vibration attenuation and at the same time harvesting energy is very much required. The work proposes an optimum design of a vibration absorber based harvester to improvise the output electrical power. As a self-energizing sensor application, the EM system is coupled with a vibration absorber to capture the currents from absorbed motions and reduce primary system vibration. Both harmonic and random excitations are considered during the simulations. The energy harvesting dynamic vibration absorber is having a spring, a damper and electromagnetic element is used to harvest the energy.