Linear piezoelectric motor

Abstract

The invention relates to a linear piezoelectric motor. The linear piezoelectric motor includes a drive pre-tensioning mechanism, an output mechanism and a bearing pedestal, wherein the drive pre-tensioning mechanism includes a pair of driving vibrators on the pedestal; the pair of driving vibrators are each provided with a vibrator piezoelectric patch; the output mechanism includes an output rod; the middle part of the output rod is provided with a +-shaped framework in the axial direction; two side bars of the +- shaped framework are vibration plates; and the vibration piezoelectric patches are arranged on the vibration plates. The linear piezoelectric motor controls the bending vibration modal of the vibration plates and the driving vibrators by means of the waveform synthesis principle so as to form coordinate action between the vibration plates and the driving vibrators to realize linear motion, and does not generate sliding friction in theory, thus being less in energy loss and being high in efficiency. The operating frequency of the linear piezoelectric motor is greater than 2000Hz; the linear piezoelectric motor has high output speed and has two operating states; and the linear piezoelectric motor can realize low speed high torque output and high speed low torque output through high and low level coordination of the first and second driving vibrators.

Description

technical field [0001] The invention belongs to the technical field of precision driving and positioning, and in particular relates to a linear piezoelectric motor. Background technique [0002] Piezoelectric motors use the inverse piezoelectric effect of piezoelectric ceramics to convert electrical energy into mechanical energy. Due to its small size, large torque, high precision, good low-speed performance, and no electromagnetic interference, it has broad application prospects in the fields of aerospace, missiles, robots, and precision instruments. The linear piezoelectric motor has the characteristics of direct output of linear motion and self-locking when power is off. It has been used in precision positioning systems, biological injection equipment, mobile phone cameras, and automotive electric remote control mirrors. [0003] At present, linear piezoelectric motors are mainly divided into traveling wave motors, standing wave motors, and quasi-static motors. The trav...

AI Technical Summary

Problems solved by technology

Quasi-static motors mainly include inertial impact motors, inchworm motors, etc. Inertial impact motors have a simple structure, are easy to control, have a large driving force, and have high resolution, but they use asymmetrical waveforms to excite motion, and the friction surface works rough, with sliding friction , fast wear, correspondingly low efficiency and short life

The inchworm motor guides the mover to move in one direction through the cooperation of three sets of piezoelectric elements. It has no sliding friction, high efficiency, and large output force (up to thousands of N). However, its structure and control circuit are relatively complicated, and the operating frequency is low. Its output speed is low

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