A Compact Impact Rotary Motor Based on a Piezoelectric Tube Actuator with Helical Interdigitated Electrodes

Abstract

This paper presents a novel impact rotary motor based on a piezoelectric tube actuator with helical interdigitated electrodes which has a compact structure and high resolution. The assembled prototype motor has a maximum diameter of 15 mm and a length of 65 mm and works under a saw-shaped driving voltage. The LuGre friction model is adopted to analyze the rotary motion process of the motor in the dynamic simulations. From the experimental tests, the first torsional resonant frequency of the piezoelectric tube is 59.289 kHz with a free boundary condition. A series of experiments about the stepping characteristics of different driving voltages, duty cycles, and working frequencies are carried out by a laser Doppler vibrometer based on a fabricated prototype motor. The experimental results show that the prototype rotary motor can produce a maximum torsional angle of about 0.03° using a driving voltage of 480 Vp-p (peak-to-peak driving voltage) with a duty ratio of 0% under a small friction force of about 0.1 N. The motor can produce a maximum average angle of about 2.55 rad/s and a stall torque of 0.4 mN∙m at 8 kHz using a driving voltage of 640 Vp-p with a duty ratio of 0% under a large friction force of about 3.6 N. The prototype can be driven in forward and backward motion and is working in stick-slip mode at low frequencies and slip-slip mode at high frequencies.

A Novel Impact Rotary–Linear Motor Based on Decomposed Screw-Type Motion of Piezoelectric Actuator

“…The PA is excited by a saw-shaped driving voltage signal. The working cycle of the piezoelectric motor can be divided into two steps and three states [30]. The piezoelectric motor can realize The piezoelectric motor is driven by a saw-shaped voltage signal.…”

“…The PA is excited by a saw-shaped driving voltage signal. The working cycle of the piezoelectric motor can be divided into two steps and three states [30]. The piezoelectric motor can realize independent rotary and linear motions by the appropriate snap ring and appropriate position of spring through the main two different friction interfaces.…”

Simulation of Motion Interactions of a 2-DOF Linear Piezoelectric Impact Drive Mechanism with a Single Friction Interface

“…With these simulation parameters, the simulation blocks were established (Figure 4) according to the abovementioned kinematics equations [36]. The whole simulation block used a subsystem module, which included a relay module, a saturation module, and a logical operator module.…”

Finite Element Analysis and Polarization Test of IDEs Piezoelectric Actuator

“…Typical composite structures are THUNDER [18], RAINBOW [19], honeycomb [20], moonietype [21], cymbal-type [22] and hinge-type [23,24], etc. In order to improve the displacement of the piezoelectric sheet, a macro displacement piezoelectric actuator with interdigitated electrodes (IDEs) [25][26][27][28][29][30] is proposed in this paper. The electrode structure and polarization, which affect the displacement of the actuator, are studied.…”