Simulation and Experimental Study of Oscillator for Permanent Magnet Vibration-to-Electrical Power Generator

This paper presents the simulation and testing of Vibration-to-Electrical Power Generators (VEPG) with different kinds of permanent magnet oscillators for scavenging ambient vibrations. The finite element method is used for magnetic fields calculation. Firstly, single permanent magnet type oscillators are simulated under the sinusoidal vibration. The calculation results show that the permanent magnet oscillator with diameter 20 mm and height 5 mm will realize 4 V peak-peak voltage. Secondly, multiple permanent magnets type oscillators are simulated under the same vibration and comparative studied with the single permanent magnet type. The results show that multiple permanent magnets oscillator with suitable structure will dramatically improve the power density of VEPG. By the end, prototypes with different kinds of oscillators are tested on the condition of sinusoidal vibration. And the experimental results agree well with the simulation ones.