In this paper, a common energy harvester is investigated which uses a specimen of magnetic shape memory alloy (MSMA). The aim of this study is to improve system performance and to evaluate the magneto-mechanical loading on the MSMA material. Since demagnetization effect is not included in the employed original MSMA model, a method to incorporate this effect is proposed which has a good performance for the specific magneto-mechanical loading of this problem. In order to decrease the need for bias magnetic field and increase system efficiency, a new return mechanism for the MSMA specimen is proposed. The results indicate that the maximum harvested power from the improved system is obtained at 0.55 T bias field, with 30% increase in power. Then, input mechanical loading in the system is studied. Firstly, applied strain rate caused by mechanical loading is studied, and a nonlinear relation between the induced RMS voltage and strain rate is observed. Next, 2D applied mechanical loading is investigated, and it is shown that by increasing the phase difference between mechanical loads in two directions, the induced voltage decreases. Moreover, applying dynamic effect to the model shows that for thin MSMA specimens, this effect is minor, but by increasing the thickness and loading frequency, the effect becomes tangible.

在本文中，研究了一种常见的能量收集器，该收集器使用了磁性形状记忆合金（MSMA）的样品。这项研究的目的是改善系统性能并评估MSMA材料上的磁机械负载。由于所使用的原始MSMA模型中不包括退磁效应，因此提出了一种合并该效应的方法，该方法对于此问题的特定磁机械负载具有良好的性能。为了减少对偏置磁场的需求并提高系统效率，提出了一种新的MSMA标本返回机制。结果表明，改进的系统在0.55 T的偏置磁场下获得了最大的收获功率，功率增加了30％。然后，研究系统中的输入机械负载。首先，研究了由机械载荷引起的外加应变率，并观察到感应RMS电压与应变率之间的非线性关系。接下来，研究了二维施加的机械负载，结果表明，通过增大两个方向上的机械负载之间的相位差，感应电压会降低。此外，对模型施加动力效应表明，对于薄的MSMA标本，该效应较小，但是通过增加厚度和加载频率，该效应变得明显。