Optimisation of additional coils of a vibration energy harvester using interior point algorithm

Abstract

The paper aims at applying the interior point algorithm in optimisation of additional coils of a small resonant electromagnetic vibration energy harvester. The system, which consists of a coreless microgenerator is driven by external vibration through a cantilever-beam spring element. Originally, the system contains only one coil mounted centrally between the moving magnets. It was found that the very low induced voltage can be significantly increased by exploitation of leakage flux outside the magnets using additional coils, whose are optimised for maximum voltage.