A Novel Electromagnetic Actuator Based on Displacement Amplification Mechanism
A Novel Electromagnetic Actuator Based on Displacement Amplification Mechanism
复制标题
DOI：
10.1109/tmech.2014.2360316
复制
发表时间：
2015-08
期刊：
影响因子：
--
通讯作者：
Hiroyuki Nabae;T. Higuchi
中科院分区：
文献类型：
--
作者：
Hiroyuki Nabae;T. Higuchi
介绍了一种利用电磁引力实现亚毫米级行程的新型直线驱动器。通常，由于推力取决于电磁体和电枢之间的差距，因此通过电磁吸引力的致动引起推力和冲程之间的折衷问题;差距（冲程）的增加急剧地降低推力。为了在保持高推力的同时实现亚毫米行程，提出了采用位移放大机构的结构，该位移放大机构经常用于扩展压电致动器的行程。首先，电磁吸引力的理论研究和没有位移放大。我们验证了位移放大可以在一定的位移范围内产生更高的推力和能量效率。在此基础上，设计了一个原型驱动器，并说明了驱动原理。此外，所提出的致动器的分析模型开发的控制和性能估计。几个基本的实验与开发的致动器进行，以揭示所提出的致动器的潜力。性能评估表明，最大行程约为450 μm，可以实现大于300 Hz的带宽，并且对于450 μm的行程，时间常数约为2 ms。此外，实验结果与从分析模型计算的仿真结果进行了比较，以验证原型驱动器是否可预测根据所提出的概念下的动态情况。这些结果表明，所提出的致动器，使良好的致动性能，它意味着有巨大的优势，从制造，装配，控制等的观点。
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 μm and a bandwidth greater than 300 Hz can be realized, and more a time constant is approximately 2 ms for a stroke of 450 μm. 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.