4.6 Article

A Compact Piezo-Inertia Actuator Utilizing the Double-Rocker Flexure Hinge Mechanism

Journal

MICROMACHINES
Volume 14, Issue 6, Pages -

Publisher

MDPI
DOI: 10.3390/mi14061117

Keywords

piezo-inertia actuator; stick-slip; slip-slip; flexure hinge

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This paper presents a compact piezo-inertia actuator with a double rocker-type flexure hinge mechanism, aiming to achieve high speed, high resolution, and low deviation between positive and reverse velocities. The experimental results demonstrate that the designed actuator has a minor speed deviation and good output characteristics.
With a simple structure and control method, the piezo-inertia actuator is a preferred embodiment in the field of microprecision industry. However, most of the previously reported actuators are unable to achieve a high speed, high resolution, and low deviation between positive and reverse velocities at the same time. To achieve a high speed, high resolution, and low deviation, in this paper we present a compact piezo-inertia actuator with a double rocker-type flexure hinge mechanism. The structure and operating principle are discussed in detail. To study the load capacity, voltage characteristics, and frequency characteristics of the actuator, we made a prototype and conducted a series of experiment. The results indicate good linearity in both positive and negative output displacements. The maximum positive and negative velocities are about 10.63 mm/s and 10.12 mm/s, respectively, and the corresponding speed deviation is 4.9%. The positive and negative positioning resolutions are 42.5 nm and 52.5 nm, respectively. In addition, the maximum output force is 220 g. These results show that the designed actuator has a minor speed deviation and good output characteristics.

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