Modelling and development of a robust hybrid rotary-translational vibration energy harvester

In this article, a new hybrid rotary-translational vibration energy harvester design is investigated. The design employs two coils which increase the peak output power by ~34% compared with a previous single-coil design. Peak power is shown to increase from 167 to 223 mW under a root-mean-square host acceleration of 5.4 Hz and 500 milli- g (where g = 9.81 m/s ² ). The measured peak power density of the double-coil device is 7 mW/cm ³ , compared to 5.5 mW/cm ³ for the original single-coil variant. The average power increased from 35 to 39.7 mW. Further to this, the device is made more robust through the inclusion of low loss wear resistant elastomer, and the effects of the wear-mitigation measures are examined.