experimental and numerical analysis of electromagnetic energy harvester based on a vertical magnetic cantilever beam

In this paper, an energy harvesting system is studied, which is modeled as a vertical cantilever beam with a harmonic base and includes magnetic springs, some magnets, and coils converting the mechanical vibrations into electrical energy, and a resistive load that consumes the harvested energy. the governing equations of motion and the induced current flowing in the resistive load are derived based on the lagrange equations. the model is validated using a manufactured prototype with three different resistive loads to show the effect of viscous damping on the harvested energy. it is proven that the increase of the external resistance leads to the reduction of both the current flowing in the coil and the electromagnetic damping coefficient. therefore, system dissipations are reduced and output power is increased. also, for any resistive load, the experiments are repeated for different locations of the magnetic springs, which shows that the proper adjustment of the location of the magnetic springs makes it possible to harvest maximum energy. from experimental results, the output power is finally obtained in the range of , which is good for low-power applications.