Design And Experimental Study Of Non-resonant Piezoelectric Linear Motor With Double-foot

Many high-tech industries have put forward higher requirements for precise positioning technology with the continuous progress of science and technology.It is necessary not only to have high displacement resolution,but also to have enough output force,can be miniaturization and no electromagnetic interference.In this paper,a double-foot non-resonant linear piezoelectric motor is designed based on the characteristics of low voltage driving,large output force and deformation amplitude of the piezoelectric stack,and combined with the double-foot alternating working principle of the double-foot linear piezoelectric motor.This type of motor has the characteristics of wide frequency response,large stroke,high displacement resolution,and little environmental interference.The main research contents are summarized as follows:This paper introduces the research status of linear piezoelectric motors,compares the characteristics of resonant and non-resonant piezoelectric motors,and analyzes the advantages of non-resonant linear piezoelectric motors.The basic characteristics of piezoelectric ceramics are introduced.The hysteresis and creep properties,mechanical properties,electrical properties and application methods of piezoelectric stacks are introduced.It provides reference for the application of piezoelectric stacks.The classification and characteristics of flexible hinges are introduced.The tensile and lateral displacement of three flexure hinges were simulated.The concept of flexibility ratio is used to describe the characteristics of the three kinds of flexible hinges,which provides a basis for the selection of flexible hinges.A parallel S-shaped spring mechanism is proposed to transmit the output force and output displacement of the piezoelectric stack.The simulation design of the mechanism parameters is carried out,and the characteristics and design methods of the mechanism are summarized.The principle of single-foot and double-foot drive is compared,and a double-foot drive type non-resonant linear piezoelectric motor with symmetrical structure is proposed.The double-foot drive enables the motor to work in a lower frequency band.The symmetrical structure enhances the consistency of the forward and reverse speed of the motor.Explained the working process of the motor and its structure is designed in detail.A translation-rotation optimization method for piezoelectric stack is proposed to reduce the rotational and translational deformation of the mounting surface of the piezoelectric stacks,so as to reduce the shear force of the piezoelectric stacks.This method is used to design the stator of the motor.The dynamic simulation of the motor is carried out to verify the operation principle of the motor.The designed motor was made and tested.The operation principle of the motor in alternating step actuation mode,continuous actuation mode and single-foot actuation mode was described.The output characteristics of the motor in three actuation modes were measured,and the characteristics of the motor in each actuation mode were compared.Experiments show that the motor can work in three actuation modes.The motor speed and output force in the alternating step actuation mode are greater than the continuous actuation mode,but it is more stable in continuous actuation mode.The motor speed and output force in the single-foot actuation mode are relatively small,but the resolution is high,which can be used as a supplement to the other two actuation modes.