A multidirectional vibration energy harvester with a ball-bowl structure

Harvesting mechanical energy from low-frequency, multidirectional daily vibrations have been considered as an excellent candidate to replace the conventional batteries in many fields. In order to achieve effectively harvesting the energy in these vibrations, this paper designs a piezoelectric vibration energy harvester with a ball-bowl structure. Benefiting from the structural characteristics, the proposed scheme can capture vibrations in different directions, and the working frequencies show a good consistency and are close to the frequency of daily vibrations. The captured energy is transmitted to the piezoelectric beam by magnetic interaction and converted into electrical energy. The analysis and experimental results have demonstrated that the designed scheme has a good performance in harvesting multidirectional vibration energy.