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A Novel Electromagnetic Actuator Based on Displacement Amplification Mechanism

机译：基于位移放大机构的新型电磁执行器

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This paper introduces a new type of linear actuator using the electromagnetic attractive force, which enables a submillimeter stroke. In general, actuation by the electromagnetic attractive force causes a tradeoff problem between the thrust force and the stroke because the thrust force depends on the gap between the electromagnet and the armature; an increase in the gap (stroke) drastically degrades the thrust force. To realize a submillimeter stroke while retaining a high thrust force, a structure that adopts a displacement amplification mechanism is proposed, which is often used to expand the stroke of a piezoelectric actuator. First, the electromagnetic attractive force is theoretically examined with and without displacement amplification. We verify that displacement amplification could create a higher thrust force and energy efficiency over a certain displacement. On the basis of this examination, a prototype actuator is designed, and the driving principle is illustrated. Further, an analytical model of the proposed actuator is developed for control and performance estimation. Several fundamental experiments with a developed actuator are performed in order to reveal the potential of the proposed actuator. The performance evaluations show that the maximum stroke is approximately 450 m and a bandwidth greater than 300 Hz can be realized, and more a time constant is approximately 2 ms for a stroke of 450 m. In addition, the experimental results were compared with the simulation results calculated from the analytical model to verify whether the prototype drives predictably according to the proposed concept under a dynamic situation. These results demonstrate that the proposed actuator enables good actuation performance, and it implies that there are tremendous advantages from the viewpoints of manufacturing, assembly, control, etc.
机译：本文介绍一种利用电磁吸引力的新型线性执行器，它可以实现亚毫米行程。通常，由于电磁力的作用取决于电磁体与电枢之间的间隙，因此电磁吸引力的致动会在推力与行程之间产生折衷问题。间隙（行程）的增加会大大降低推力。为了在保持高推力的同时实现亚毫米行程，提出了一种采用位移放大机构的结构，该结构通常用于扩大压电致动器的行程。首先，理论上在有和没有位移放大的情况下检查电磁吸引力。我们验证了位移放大可以在一定位移下产生更高的推力和能量效率。在此检查的基础上，设计了原型执行器，并说明了驱动原理。此外，为控制和性能估计开发了所提出的致动器的分析模型。为了揭示所提出的执行器的潜力，对开发的执行器进行了一些基础实验。性能评估表明，最大冲程约为450 m，可以实现大于300 Hz的带宽，对于450 m的冲程，时间常数约为2 ms。此外，将实验结果与从解析模型计算出的仿真结果进行比较，以验证原型在动态情况下是否能够按照提出的概念可预测地驱动。这些结果表明，所提出的致动器具有良好的致动性能，并且从制造，装配，控制等方面来看，这意味着具有巨大的优势。

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