Double-foot driving non-resonant piezoelectric linear motor and electric excitation method

Abstract

The invention discloses a double-foot driving non-resonant piezoelectric linear motor and an electric excitation method. The motor comprises a stator, a linear guide rail, a ball sliding table, a pre-pressure mechanism and a base, wherein the stator is mainly composed of four rhombic flexible frames and four laminated piezoelectric ceramic groups which are installed in the flexible frames in a one-to-one correspondence mode in the specific direction, the stator is located between the linear guide rail and the pre-pressure mechanism, keeps in contact with the front end face of an upper slidingblock of the linear guide rail under the pre-pressure effect of the pre-pressure mechanism and enables the piezoelectric linear motor to be powered off and self-locked. According to the invention, thestator is of an integrated symmetrical structure, so that it is convenient to process and assemble, the processing error of the stator has little influence on the precision of the motor, a good contact state between double driving feet of the stator and the linear guide rail can be better ensured, and large-stroke actuation is provided while high precision and large thrust are realized. Specificexcitation voltage signals are respectively applied to the four laminated piezoelectric ceramic groups, so that the stator can drive the linear guide rail to perform linear motion.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric precision actuation, and relates to a biped-driven non-resonance piezoelectric linear motor and an electric excitation method. Background technique [0002] Piezoelectric linear motor is a precision actuating device that uses the inverse piezoelectric effect of piezoelectric ceramics to convert electrical energy into mechanical energy and realize the conversion of microscopic vibration into macroscopic motion. Its development has defined many types, including traveling wave type, standing wave type, multi-mode vibration type, inertial drive type and inchworm type, etc. Among them, piezoelectric motors that can output large displacement at low voltage and low frequency by using laminated piezoelectric ceramics are called non-resonant piezoelectric linear motors. [0003] The core mechanism of the existing non-resonant piezoelectric linear motor—the stator is generally complex and loose in co...

AI Technical Summary

Problems solved by technology

[0003] The core mechanism of the existing non-resonant piezoelectric linear motor—the stator is generally complex and loose in configuration, which can easily affect the overall output characteristics of the motor: on the one hand, complex structures are prone to precision errors during processing, resulting in structural The accumulation of errors after the overall assembly affects the accuracy of the motor output movement; on the other hand, the loose configuration puts forward higher requirements for the assembler. If the assembly is not done properly, it is easy to make the stator and the mover unable to fully contact, which will greatly reduce the performance of the motor. Output thrust, and at the same time, it is difficult for each part to maintain the original position during the movement and continue to work stably

[0004] In addition, the existing non-resonant piezoelectric linear motor has the problem of unsustainable quantitative preload output in the design of the preload application and the stator adjustment mechanism.

Images