Three types of planar structure microspring electro-thermal actuators with insulating beam constraints
Three types of planar structure microspring electro-thermal actuators with insulating beam constraints
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三种具有绝缘梁约束的平面结构微弹簧电热执行器
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
W. I. Milne
中科院分区：
文献类型：
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作者：
J. K. Luo;A. Flewitt;S. Spearing;N. Fleck;W. I. Milne
提出了利用电绝缘梁作为约束构造大位移平面类弹簧电热执行器的新概念。在此基础上，介绍了三种具有多人字形结构和约束梁的微弹簧驱动器。这些装置的一种类型（弹簧）中的约束梁水平定位以限制活动臂在x方向上的扩张，并且仅在y方向上产生位移。在其他两种类型的致动器（偏转器和收缩器）中，约束梁平行于主动臂定位。当约束梁位于主动臂的内侧时，致动器在y方向上产生向外偏转。当它们在主动臂的外侧时，致动器产生向内收缩。有限元分析被用来模拟性能。仿真结果表明，这些微弹簧驱动器的位移都成正比的人字形节的数量在串联，从而实现上级替代驱动器的位移。弹簧致动器的位移强烈地依赖于光束角度，并且随着光束角度的增加而减小，偏转器对光束角度不敏感，而收缩器致动器的位移随着光束角度的增加而增加。
A new concept of using an electrically insulating beam as a constraint is proposed to construct planar spring-like electro-thermal actuators with large displacements. On the basis of this concept, three types of microspring actuators with multi-chevron structures and constraint beams are introduced. The constraint beams in one type (the spring) of these devices are horizontally positioned to restrict the expansion of the active arms in the x-direction, and to produce a displacement in the y-direction only. In the other two types of actuators (the deflector and the contractor), the constraint beams are positioned parallel to the active arms. When the constraint beams are on the inner side of the active arms, the actuator produces an outward deflection in the y-direction. When they are on the outside of the active arms, the actuator produces an inward contraction. Finite-element analysis was used to model the performances. The simulation shows that the displacements of these microspring actuators are all proportional to the number of the chevron sections in series, thus achieving superior displacements to alternative actuators. The displacement of a spring actuator strongly depends on the beam angle, and decreases with increasing the beam angle, the deflector is insensitive to the beam angle, while the displacement of a contractor actuator increases with the beam angle.