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Practical Test of Contactless Rotational Piezoelectric Generator for Low Speed Application

Piezoelectric has drawn significant attention as the smart and straightforward generator as energy harvester for decades. The principle of this theology is to transform the vibration from itself blending become electricity through the piezoelectric effect phenomenal. Piezoelectric has been used to generate electricity through the cantilever form. However, it still hard to apply with the rotational movement. This research represents the practical optimization test of the rotational piezoelectric generator for a low-speed application such as application in ocean wave or wearable device under the speed between 10 to 100 RPM. The design was applied a pushing force of two permanent magnets which, attached at the far end of the piezoelectric cantilever in stator and the rotational disk in rotor. When the application load drives the rotor, the magnetic field from each permanent magnet will repulse each other and generate AC electricity. The experimental result shows the possibility to harvest energy in the range of 5.92 and 234.47 microwatts at 10 RPM (0.167 Hz) and 100 RPM (1.667 Hz) in order.