A Miniature Energy Harvesting Device Using Martensite Variant Reorientation

Abstract:

This paper presents a miniature energy harvesting device that makes use of stress-induced cyclic martensite variant reorientation in a Ni-Mn-Ga single crystal of 0.3x2x2 mm³ size. The stress- and magnetic field-induced reorientation is investigated for single crystalline Ni_50.2Mn_28.4Ga_21.4 specimens of 0.3 mm thickness that are cut along the (100) direction and subjected to uniaxial compressive loading. A demonstrator is presented consisting of a FSMA specimen placed in the gap of a magnetic circuit to guide and enhance the field of biasing permanent magnets. The cyclic motion of a piezoelectric bimorph actuator is used to mechanically load the FSMA specimen. The corresponding change of magnetic flux induces an electrical voltage in a pick-up coil (N=2000 turns). The effects of biasing magnetic field, strain amplitude and strain velocity are investigated. An optimum magnetic field of 0.4 T exists, where the output voltage reaches 120 mV at a strain velocity of 0.006 ms^-1.

• Periodical: Materials Science Forum (Volumes 738-739)
• Pages: 411-415
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.738-739.411
• Online since: January 2013
• Authors: Manfred Kohl, Rui Zhi Yin, Viktor Pinneker, Yossi Ezer, Alexei Sozinov
• Keywords: Energy Harvesting, Ferromagnetic Shape Memory Alloys (FSMAs), Magneto Strain, Villari Effect

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