Development of Novel Magnetostrictive Energy Harvester
In this paper, a novel vibration-based harvester using machineable magnetostrictive materials (MSM), Galfenol, is presented. Galfenol, an alloy of iron and gallium, is able to convert stress to magnetic field. Galfenol is malleable, strong with high magnetic permeability. The presented setup exploits a 50 mm length and 10 mm diameter Galfenol rod which is clamped in the middle of a cantilever beam. With the provided setup, the beam only has vertical adjustable vibrations. The output signal of 1500 turns pickup coil shows 250 mV for 27 Hz (natural frequency of cantilever beam with Galfenol) which is an acceptable result for a harvester. The results of the experiments show the capability of Galfenol to be used in harvesters.