Modeling of Strain-Magneticcharacteristic of Magnetic Shape Memory Alloy in Energy Harvester

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Pakdin, Mahdi | 2017

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 50292 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Sayyadi, Hassan
Abstract:
Harvesting energy from renewable sources in nature, such as wind energy, solar energy, water energy and vibrations has always attracted researchers. There exist different ways to harvest energy from environmental vibrations. In this thesis, energy harvesting via Magnetic Shape Memory Alloys (MSMAs) has been taken into account due to important advantages of these alloys, such as their long fatigue life and good performance at high amplitudes and low frequencies.In this system, applying strain on alloy changes the magnetization and this change generates voltage in the pick-up coil around the MSMA. On the other hand, since the strain-magnetization relation is nonlinear and hysteresis, determining a relation to describe magnetization change versus applied strain is a major challenge.To this end, a model for Ni-Mn-Ga is developed using modified generalized Prandtl-Ishlinskii due to its simplicity and accuracy and then according to Faraday’s law of induction the generated voltage is calculated. Finally, for different strain inputs, the effect of input type on energy harvesting is studied
Keywords:
Magnetic Shape Memory Alloys (MSMA) ; Energy Harvesting ; Magnetization ; Prandtl-Ishlinskii Model ; Faraday's Induction Law

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