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A Miniature Energy Harvesting Device Using Martensite Variant Reorientation

机译：利用马氏体变取向的微型能量收集装置

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摘要

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 0.3×2×2 mm3 size. The stress- and magnetic field-induced reorientation is investigated for single crystalline Ni_(50.2)Mn_(28.4)Ga_(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 rate are investigated. An optimum magnetic field of 0.4 T exists, where the output voltage reaches 120 mV at a strain rate of 6 s~(-1).
机译：本文提出了一种微型能量收集装置，该装置利用了应力诱导的循环马氏体变体重新定向，尺寸为0.3×2×2 mm3的Ni-Mn-Ga单晶。研究了沿（100）方向切割并承受单轴压缩载荷的0.3 mm厚度的单晶Ni_（50.2）Mn_（28.4）Ga_（21.4）标本的应力和磁场诱导的取向。展示了一个演示器，该演示器由放置在磁路间隙中的FSMA样品组成，以引导和增强偏置永磁体的磁场。压电双压电晶片执行器的循环运动用于机械加载FSMA样品。磁通量的相应变化会在拾波线圈中感应出电压（N = 2000匝）。研究了偏置磁场，应变幅度和应变率的影响。存在0.4 T的最佳磁场，其中输出电压以6 s〜（-1）的应变速率达到120 mV。

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