A linear piezoelectric motor

Abstract

The development of a linear hybrid transducer type piezoelectric motor is shown. This design has the advantages of light weight, macro-and micro-positioning, and large force/velocity output. The motor consists of a longitudinal actuator that provides output displacement and force, and two alternating clamping actuators which provide the holding force. The advantages of this design over other types of piezoelectric motor are shown. Significant design considerations for the development of a piezoelectric motor (including material choices, shear loads on piezoelectric materials, and contact surface interaction) are discussed. A simulation, including a finite element analysis of the system, is used to predict the motor response to various input sets. A prototype motor is built and its characteristics are compared to theoretical predictions.

Force control of a piezoelectric actuator based on a statistical system model and dynamic compensation

“…The second family contains non-resonant motors. A member of this family is the inchworm-motor or piezo-stepper [24] which introduces an alternating clamping-mechanism to convey a drive rod. Models for this motor type are mainly FEM-based [24].…”

“…A member of this family is the inchworm-motor or piezo-stepper [24] which introduces an alternating clamping-mechanism to convey a drive rod. Models for this motor type are mainly FEM-based [24]. The controllers deal with hybrid force-position control of the actual clampingmechanism and regulate the coordinated movement of the parts [25].…”

A Control Methodology for an Inchworm Piezomotor

“…The first class is that of the ultrasonic motors [3][4], which use an elliptical motion, resulting from waves generated by a piezostack attached to a vibrator (stator), that is transmitted through friction to a slider (rotor). The ultrasonic motors are not suitable for low-speed positioning.…”

“…They require high-power electronics and cannot support large loads. The second class is that of the inchworm motors [2][3][4], which usually use two clamping and one longitudinal piezostacks. The three piezostacks are controlled in such a way so as to generate a series of micro-steps each corresponding to one cycle.…”

Micro-positioning of linear piezoelectric motors based on a learning nonlinear PID controller

“…Another type of indirect-drive piezoelectric motor is the ultrasonic motor or the acoustic motor which uses piezoelectric components to generate ultrasonic waves and produce a linear motion [7]- [10]. The characteristics of ultrasonic piezomotors are: high resolution, unlimited travel, wide dynamic range of velocity, hold stability at power off, and a small compact structure.…”