A linear actuator controlled by the reversed-phase connection of two piezoelectric bimorphs is proposed in this study to solve the problem of drawback in the existing piezoelectric linear actuators. The actuator is driven by one excitation signal, the two piezoelectric bimorphs will always bend in opposite directions by the reversed-phase connection, so the directions of the force output by the two piezoelectric bimorphs are opposite. Because of the length difference of the clamping blocks, the two forces outputted by each bending is different in magnitude, and always have a resultant force in the same direction to make the actuator move forward two steps in one cycle without drawback. A series of experiments were conducted to evaluate the performance of the actuator provided. The starting voltage is 40 Vp−p\text{V}_{\mathrm {p-p}} , resolution can reach 1.16 μm1.16~\mu \text{m} without load. The load capacity of the actuator is 450 g with a 100 Vp−p\text{V}_{\mathrm {p-p}} voltage, a 2-Hz frequency, and the average step displacement in this case is 0.725 μm0.725~\mu \text{m} . The prototype has high linearity and good repeatability. Experiments have proved that the actuator controlled by reversed-phase connection can eliminate drawback in principle, and can move forward two steps in one cycle. The resolution of the prototype by the reversed-phase connection is much higher than the in-phase connection, and it is a new method to improve the driving performance of piezoelectric actuators.

中文翻译：

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两个双压电晶片反相连接控制的压电线性执行器


本研究提出了一种由两个压电双压电晶片反相连接控制的线性致动器，以解决现有压电线性致动器的缺点问题。致动器由一个激励信号驱动，通过反相连接，两个压电双压电晶片总是向相反方向弯曲，因此两个压电双压电晶片输出的力的方向相反。由于夹紧块的长度不同，每次弯曲时输出的两个力大小不同，但始终有一个相同方向的合力，使执行器在一个周期内向前移动两步而不会出现缺陷。进行了一系列实验来评估所提供的执行器的性能。起始电压为40 Vp−p\text{V}_{\mathrm {pp}}，无负载时分辨率可达1.16 μm1.16~\mu \text{m}。执行器的负载能力为 450 g，电压为 100 Vp−p\text{V}_{\mathrm {pp}}，频率为 2 Hz，此时的平均步进位移为 0.725 μm0.725~ \mu \text{m} 。该样机线性度高，重复性好。实验证明，反相连接控制的执行器在原理上可以消除缺陷，并且可以在一个周期内前进两步。反相连接原型机的分辨率远高于同相连接，是提高压电执行器驱动性能的新方法。