Kalel Sudarshan, Wang Wei-Chih
Institute of Nanoengineering and Microsystems, National Tsinghua University, Hsinchu City 300, Taiwan.
Department of Power Mechanical Engineering, National Tsinghua University, Hsinchu City 300, Taiwan.
Polymers (Basel). 2021 Jan 28;13(3):415. doi: 10.3390/polym13030415.
Heat generation in active/passive layer-based piezoelectric actuators is unavoidable due to the mechanical, dielectric, and resistive losses in the material. In this work, a polyvinylidene fluoride (PVDF)-based unimorph cantilever actuator is developed with simulation and experimental studies on the effect of DC high voltages on heat production in the PVDF layer. A layer of one-way shape memory polymers (1W-SMPs) is integrated in the actuator to exploit the heat produced to increase the bending angle. The length and mounting location of the SMP layer impacts the bending of the actuator; by using an SMP layer with a length equal to half of the PVDF layer at the center of the unimorph actuator, the absolute bending angle is increased to 40° compared to the base piezo bending angle of 4° at 20 V/µm.
由于材料中的机械、介电和电阻损耗，基于主动/被动层的压电致动器中产生热量是不可避免的。在这项工作中，开发了一种基于聚偏二氟乙烯（PVDF）的单压电片悬臂致动器，并对直流高压对PVDF层中产热的影响进行了模拟和实验研究。在致动器中集成了一层单向形状记忆聚合物（1W-SMPs），以利用产生的热量来增加弯曲角度。SMP层的长度和安装位置会影响致动器的弯曲；通过在单压电片致动器中心使用长度等于PVDF层一半的SMP层，在20 V/µm的电压下，绝对弯曲角度从基础压电弯曲角度4°增加到了40°。
