Abstract
A numerical and experimental investigation of a flat, cross-shaped piezoelectric rotary motor is presented. The design and configuration of the motor allow it to be mounted directly to the printed circuit board or integrated into the other system where mounting space is limited. The design of the motor is based on the cross-shaped stator with 16 piezo ceramic plates, which are glued on it. The rotor is placed at the center of the stator and consists of two hemispheres, a shaft, and a preloading spring. Special clamping of the stator was developed as well. It consists of four V-shaped beam structures that allow it to rigidly clamp the stator with reduced damping effect to vibrations. The operation principle of the motor is based on the first in-plane bending mode of the cross-shaped stator. The motor excitation is performed through four harmonic signals, which have a phase difference of π/2. A numerical investigation of the motor was conducted to optimize the geometrical parameters of the stator and to analyze the displacement characteristics of the contacting point. The prototype of the motor was made, and the electrical, as well as rotation speed characteristics of the motor, were measured. The results of the experimental investigation showed that the motor is able to provide a maximum rotation speed of 972.62 RPM at 200 Vp-p when the preload force of 22.65 mN was applied.
Highlights
Nowadays, piezoelectric motors are widely used in industrial and scientific areas, including microbiology, nano-imaging systems, vibrometry, laser focusing systems, etc
Experimental investigations of the motor showed that maximum rotation speed reached 1800 RPM at an excitation voltage of 14 Vp-p when a preload of
The motor occupies an area of 169 mm2 and is suitable for mounting on a printed circuit board or can be integrated into other devices where mounting space is limited
Summary
Piezoelectric motors are widely used in industrial and scientific areas, including microbiology, nano-imaging systems, vibrometry, laser focusing systems, etc. The piezoelectric rotary motors are based on traveling wave vibrations of ring-shaped stators [6,7,8,9,10]. The proposed design of the motor was based on 8 thin cantilevers composed of the cross-shaped stator, 16 piezo ceramic plates, and a double conical rotor placed at the center of the stator. The design of the motor was based on three cantilever oscillators, which form a cross-shaped stator. The motor operation was based on longitudinal and flexural vibrations of cantilever-based oscillators Synchronization of these vibrations allows one to obtain an elliptical motion of contact points. Experimental investigations of the motor showed that maximum rotation speed reached 1800 RPM at an excitation voltage of 14 Vp-p when a preload of. The proposed piezoelectric motor can be mounted directly to the printed circuit board or in the systems where mounting volume and surface are critical parameters
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