Shape memory alloys have recently gained attention for applications in motor driving components. The most expressive advantage of shape memory alloy components in that type of application is the high torque to motor weight ratio. Considering the importance of these studies, this article presents the design, manufacture, and theoretical and experimental analyses of a rotary motor driven by Ni–Ti shape memory alloy mini springs. The adopted motion mechanism allows the motor to run in continuous and bidirectional rotation mode, where speed and torque are determined by a drive sequence. A simplified analytical model was implemented, considering the thermomechanical characteristics of the shape memory alloy springs. Experimental tests with and without electrical drives were performed using properly designed electronic measurement instrumentation. The principal scientific contribution of this work is the demonstration of the motor’s functionality and torque generation. An energy density index of 1.41 × 10−3 Nmm/mm3 was attained, which is higher to those of other similarly constructed motors in the literature.

中文翻译：

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由形状记忆合金迷你弹簧驱动的紧凑型旋转电机

形状记忆合金最近在电机驱动部件中的应用受到关注。形状记忆合金部件在此类应用中最具表现力的优势是高扭矩与电机重量比。考虑到这些研究的重要性，本文介绍了由 Ni-Ti 形状记忆合金微型弹簧驱动的旋转电机的设计、制造以及理论和实验分析。采用的运动机构允许电机以连续和双向旋转模式运行，其中速度和扭矩由驱动顺序决定。考虑到形状记忆合金弹簧的热机械特性，实现了一个简化的分析模型。使用正确设计的电子测量仪器进行有和没有电力驱动的实验测试。这项工作的主要科学贡献是演示电机的功能和扭矩生成。获得了 1.41 × 10−3 Nmm/mm3 的能量密度指数，高于文献中其他类似构造的电机。