Bidirectional Active Piezoelectric Actuator Based on Optimized Bridge-Type Amplifier

Abstract

Piezoelectric actuators based on bridge displacement amplifying mechanisms are widely used in precision driving and positioning fields. The classical bridge mechanism relies on structural flexibility to realize the return stroke, which leads to the low positioning accuracy of the actuator. In this paper, a series bridge mechanism is proposed to realize a bidirectional active drive; the return stroke is driven by a piezoelectric stack rather than by the flexibility of the structure. By analyzing the parameter sensitivity of the bridge mechanism, the series actuation of the bridge mechanism is optimized and the static and dynamic solutions are carried out by using the finite element method. Compared with the hysteresis loop of the piezoelectric stack, the displacement curve of the proposed actuator is symmetric, and the maximum nonlinear error is improved. The experimental results show that the maximum driving stroke of the actuator is 129.41 μm, and the maximum nonlinear error is 5.48%.

A novel stick-slip piezoelectric actuator is developed based on a parallelogram flexible drive mechanism to minimize shear force

“…been widely used in various technical fields, including precision manufacturing [1][2][3], aerospace [4][5][6] and bioengineering [7][8][9]. Precision positioning techniques based on piezoelectric materials have garnered significant attention due to their exceptional properties, including fast response time [10] and high resolution [11]. However, the working stroke of a single piezoelectric element is only a few micrometers or tens of micrometers, which is insufficient to meet the demands of practical applications.…”

Advances in applications of piezoelectronic electrons in cell regulation and tissue regeneration

“…37 Piezoelectric semiconductors with wurtzite structures possess the properties of piezoelectricity and semiconducting simultaneously, and are very useful in making piezotronic transistors, in which the electronic transport is controlled by inner-crystal potential. [38][39][40] Based on piezoelectronics, devices such as mechanical sensors, 41,42 ultrasonic transducers, 43,44 energy harvesters, [45][46][47] robots and actuators [48][49][50] have been widely applied in bioelectronics and biomedical fields recently. The effect of piezoelectronic electrons from piezoelectric materials on cells and tissues is similar to that of bioelectricity and an external EF.…”

The Influence of Flexure Variation to Vibration-Assisted Micro-Milling Device by Using Finite Element Analysis

“…During machining, the amplitude displacement output from the piezoelectric actuator ranges between 0-10 micrometres and works based on the actuator material properties 24,25) . Several studies show amplitude displacement can be measured using displacement sensor 26,27) or predicted using Finite Element Analysis (FEA) [28][29][30][31] . The measurement method is more accurate than the prediction ones, but this method requires high investment in the micro displacement sensor and the ultrasonic-assisted micro-milling device prototype.…”