Design and Simulation of a Magnetic Shape Memory (MSM) Alloy Energy Harvester

Niskanen, Antti J.; Laitinen, Ilkka
January 2013
Advances in Science & Technology;2013, Vol. 78, p58
Academic Journal
We present the simulation and development of a vibration energy harvester based on an active element made of Ni-Mn-Ga Magnetic Shape Memory (MSM) alloy. As the MSM element is subjected to mechanical stress within an external magnetic field, its magnetization changes in proportion to its length, facilitating energy generation in a pick-up coil. Whereas conventional piezo and magnetostrictive devices operate with small (sub-millimeter) stroke at high frequencies (kHz range), the MSM harvester is best suited to longer (millimeter range) stroke at a low frequency (100 Hz or below). Power output of 20 mW has been demonstrated with the prototype device operating at 45 Hz.


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