Abstract
Nowadays, piezoelectric linear actuators draw wide attention of researchers around world as its advantages of simple structure, high precision and rapid response. To improve the performance of the non-resonant piezoelectric motor, a symmetric piezoelectric linear motor driven by double-foot is studied in the paper. The vibration model of the stator is established based on the structure and the working mechanism of motor. Then guide mechanism and preload device is designed and a prototype is fabricated to verify the feasibility of structure. The performances of motor under different driving signal are tested in experiment. By applying three-phase square-triangular waves signal and four-phase sine waves signal of peak to peak value 100 V with 50 V offset and frequency of 100 Hz, the speed of prototype reaches 733 μm/s and 667 μm/s and the maximum thrust is 8.34 N and 6.31 N respectively.
Highlights
Piezoelectric linear motors are widely used in the various application fields as its advantages of simple structure, high precision and rapid response [1,2,3,4,5,6,7,8]
The existing piezoelectric linear motors can be classified into resonant type and non-resonant type
To summarize the advantages and disadvantages of stators in traditional motors, a novel symmetric stator which has the merits of simple structure, convenient assembly and high thrust is designed in the paper
Summary
Piezoelectric linear motors are widely used in the various application fields as its advantages of simple structure, high precision and rapid response [1,2,3,4,5,6,7,8]. In order to generate linear motion, vibration at ultrasonic frequency range on an oscillating element is transferred to a moving element through frictional coupling [12,13,14,15] These motors are greatly affected by the change of temperature and structure parameter. Inchworm motor utilizes alternating motion of clamping mechanism and driving mechanism to make the mover do linear motion continuously It has high positioning accuracy and strong carrying capacity, but its structure is complex and its performance is obviously affected by the processing precision and assembly situation. Inertial piezoelectric linear motor utilizes the rapid deformation of piezoelectric element to produce large inertial impact in the moving element. It will be driving the mechanism with the advantages of high thrust and large stroke.
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