Development of micromotors using the backflow effect of liquid crystals
Development of micromotors using the backflow effect of liquid crystals
复制标题
利用液晶回流效应开发微电机
DOI：
10.1016/j.sna.2020.112386
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Chono Shigeomi
中科院分区：
文献类型：
--
作者：
Tsuji Tomohiro;Chono Shigeomi
我们开发了利用回流效应的液晶微电机。电机由同心玻璃圆柱体组成，差距填充有液晶。平面取向层涂覆内圆柱体的外表面，而垂面层涂覆外圆柱体的内表面，导致圆柱体之间的混合取向分布。在实验中研究了电机尺寸、频率和外加电场电压对内筒旋转速度的影响。对于圆柱之间的固定间隙，旋转速度随着所施加的电压的增加和随着圆柱内径的减小而增加。此外，速度取决于所施加电压的频率。当脉冲电压为10 V，占空比为5%，频率为1000 Hz时，对直径为70 μm和80 μm的一对圆柱体，获得的最大转速约为20 rpm。增大差距会导致旋转速度降低，因为电场强度降低。液晶马达的基本原理不是通常的旋转运动，而是“沿圆周沿着平移运动”，类似于线性致动器。
We developed liquid crystal micromotors that exploit the backflow effect. The motors are composed of concentric glass cylinders, the gap being filled with a liquid crystal. A planar orientation layer coats the outer surface of the inner cylinder, whereas a homeotropic layer coats the inner surface of the outer cylinder, resulting in a hybrid orientation profile between the cylinders. The effects of motor size, frequency, and voltage of the applied electric field on the speed of rotation of the inner cylinder were studied in experiments. For a fixed gap between cylinders, the speed of rotation increases with increasing applied voltage and with decreasing inner cylinder diameter. Furthermore, the speed depends on the frequency of the applied voltage. The maximum speed of rotation obtained was approximately 20rpm for a pair of cylinders of 70 μm and 80 μm in diameter and a pulsed voltage of 10 V, duty ratio of 5%, and frequency of 1000 Hz. Increasing the gap results in a decrease in the speed of rotation because the strength of the electric field decreases. The principle underlying liquid crystal motors is not the usual rotational motion but a “translational motion along the circumference”, analogous to a linear actuator.