Numerical analysis of micro electromagnetic energy harvester under random excitation

Micro energy harvester systems are a new technology that replaces batteries and energy storage devices that have limitations. Not needing to replace or recharge them periodically, very small volume and weight, as well as high accuracy are the characteristics of the micro energy scavenger system. This paper investigates the electromagnetic micro energy harvester system under random white noise excitation. The mechanical model considered for the micro energy harvester is in the form of a beam. In this system, the base acceleration is the input of the micro energy recovery and the induced voltage in the coil is the output of the system. The base excitation is assumed to be a weakly stationary Gaussian white noise random process. According to the mechanical motion equation of the system, the frequency response function can be obtained. The aim of this research is to calculate the mean power produced in the electromagnetic micro energy harvester under random excitation. Stress analysis is done using simulation in finite element software and numerical solution, and the results’ correctness is confirmed. Finally, the effect of the electromagnetic micro energy scavenger on the average parameters power produced is investigated.