Low-frequency driven energy harvester with multi-pole magnetic structure

This paper describes the vibration energy harvester using the electromagnetic energy conversion method. To operate at low-frequency with high efficiency, we have suggested a new spring mass system in addition to a thin flame-resistant (FR)-4 spring and multi-pole neodymium iron boron (NdFeB) permanent magnetic structure. FR-4 spring with spiral structure and multi-pole magnetic structure is a suitable design for low-frequency operation and power efficiency. ANSYS finite element method was used to explore the mechanical properties of the device. The experimental results showed that the proposed energy harvester can generate a maximum output power of 490 mu W with a resonance frequency of 12 Hz and an acceleration of 0.2 g (g = 9.81 m/s(2)). In addition, it is attached to an automobile engine producing an output voltage of 231 mV, showing promising potential applications.