Design and construction of high efficiency magnetostrictive energy harvester for huge and short-time impact vibration systems

This paper presents the design and construction of a vibration energy harvester based on magnetostrictive material which consists of one coil-wound Terfenol-D rod with a PM and air-gap in each magnetic circuit. Relation of magnetic field in Terfenol-D rod with different principal design parameters is derived, its uniformity and intensity are analyzed, and the magnetic circuit configuration is optimized. The magnetostrictive-based vibration energy harvester can generate V/W magnitude induced voltage and power generation larger than conventional smart harvester. The system can be safely used in transient impact up to 20-30 MPa.