CN202565197U

CN202565197U - Asymmetric piezoelectric inertial driver

Info

Publication number: CN202565197U
Application number: CN2012202309389U
Authority: CN
Inventors: 黄妍; 温建明; 郑兴; 陶李祥; 沈燚青; 梁夏峰; 张海峰; 傅骏翔
Original assignee: Zhejiang Normal University CJNU
Current assignee: Zhejiang Normal University CJNU
Priority date: 2012-05-13
Filing date: 2012-05-13
Publication date: 2012-11-28
Anticipated expiration: 2022-05-13

Abstract

The utility model relates to an asymmetric piezoelectric inertial driver. The driver comprises a V type guide rail support seat, a V type block, a translation body, substrates, piezoelectric wafers, a mass block and a rotary body. The V type block is pasted on the translation body. Both sides of the substrate fixed on the translation body are bonded with piezoelectric wafers with different lengths. When symmetric electrical signals are imposed on the piezoelectric wafers, the piezoelectric wafers with different lengths drives the substrate to generate asymmetric bending deformation and to further generate asymmetric inertial force, cooperating with friction to realize the directional movement of the translation mechanism. The substrate fixed on the rotary body is bonded with piezoelectric wafers with different lengths. When the excitation of symmetric electrical signals is imposed, asymmetric torque is generated, cooperating with friction torque to realize the directional movement of the rotary body. The asymmetric piezoelectric inertial driver provided by the utility model has the advantages of simple structure, easy drive control, high positioning accuracy and large travel.

Description

A kind of asymmetric piezoelectric inertia driver

Technical field

The utility model belongs to the accurate Driving technique of piezoelectricity field, particularly a kind of asymmetric piezoelectric inertia driver.

Background technology

The piezoelectric inertia driver is that the inertia force and the frictional force acting in conjunction that utilize piezoelectric element to produce realize driving.Have compact conformation, response characteristic is good, and no electromagnetic interference is easy to characteristics such as control, is suitable for the workplace of high-resolution, big stroke, has widely in fields such as optical engineering, ultraprecise processing, fine operations and uses.

The piezoelectric inertia driver can be divided into two types at present, and the one, piezoelectric inertia impact formula driver, its principle is that asymmetric signal of telecommunication excitation piezoelectric bimorph vibration produces different inertial impact forces (inertial impact force is poor), forms the driver directed movement; The 2nd, piezoelectric inertia friction-type driver (claiming sticking gliding style again); Its principle is the slowly contraction of elongation fast of asymmetric signal of telecommunication excitation piezoelectric ceramic; Fast during elongation because the effect of inertia brake pad keeps motionless, and brake pad directed movement under the stiction effect when slowly shortening.Owing to adopted the asymmetrical signals excitation,, do not utilized microminiature integrated so driving control system is complicated.

In view of the present existing problem of piezoelectric inertia driver; The utility model proposes a kind of symmetry signal excitation piezoelectric chip that utilizes and forms different inertial impact forces through asymmetric fixture; And the frictional force acting in conjunction between the contact-making surface realizes the driver directed movement, has that drive system is simple, a compact conformation, big, the positioning accuracy advantages of higher of stroke.

Summary of the invention

The purpose of the utility model is generally to adopt the asymmetric waveform signal of telecommunication as drive signal to existing piezoelectric inertia driver; Problems such as driving control system complicacy; And a kind of asymmetric piezoelectric inertia driver is proposed, have characteristics such as simple in structure, control is convenient, stroke is big, resolution height.

The technical scheme of the utility model employing is following to achieve these goals:

A kind of asymmetric piezoelectric inertia driver, described driver comprises V-type rail supporting seat 1, supporting seat is provided with V-block 2; V-block 2 is fixed together through screw and pan body 3, and beryllium-bronze substrate 5 is fixed on both sides, pan body front and back, and the substrate both sides are provided with piezoelectric chip 6; Two ends connect lumped mass piece 4, have bellmouth 8 on the pan body, cooperate with rotary body 7 upper conical posts; Have rectangular through-hole 9 in the middle of the rotary body, substrate is inserted in the through hole, fixes with screw; Both sides are stained with the piezoelectric chip that is uneven in length on the substrate, and rotary body both sides piezoelectric chip antisymmetry arranges that the substrate two ends are connected with the lumped mass piece.

A kind of execution mode of the utility model is: realize that straight-line structure is, two piezoelectric chips that substrate 501 1 sides are pasted are uneven in length, and form asymmetric piezoelectric bimorph; The piezoelectric chip that the substrate opposite side is pasted and it is along pan body 3 center symmetric arrangement; The intrinsic lumped mass piece in substrate two ends.

The another kind of execution mode of the utility model is: realize that the structure that rotatablely moves is, two piezoelectric chips that substrate 503 1 sides are pasted are uneven in length, and form asymmetric piezoelectric bimorph; The piezoelectric chip that the substrate opposite side is pasted and its are arranged along rotary body 9 center antisymmetry; The intrinsic lumped mass piece in substrate two ends.

The utility model utilizes the piezoelectric chip of unequal length to be bonded in and makes up asymmetric piezoelectric inertia driver on the substrate; This driver is under the excitation of symmetry waveform signal driving voltages such as sine wave; Substrate drives lumped mass piece reciprocally swinging; Because piezoelectric chip length is different, therefore produce two-way different inertial impact force, cooperate the frictional force of contact-making surface to form unidirectional moving or rotating.

The characteristic and the advantage of the utility model are: utilize the piezoelectric chip of unequal length to form the asymmetric of structure; Under the symmetry signal excitation, produce asymmetric inertia force; Realize straight line and rotatablely move that driving control system is simple, compact conformation, stroke are big with friction fit.

Description of drawings

Fig. 1 is the utility model two degrees of freedom driver tomograph;

Fig. 2 is the utility model olinear motion part tomograph;

Fig. 3 is the utility model moving body vertical view and main pseudosection;

Fig. 4 is that the utility model linear drives is arranged sketch map figure with piezoelectric chip;

Fig. 5 is the utility model rotating part tomograph;

Fig. 6 is that the utility model rotary body master looks and top plan view;

Fig. 7 is that the utility model rotation driving is arranged sketch map with piezoelectric chip;

The practical implementation method

Further specify implementation method below in conjunction with accompanying drawing:

Embodiment 1

Like Fig. 1, shown in Figure 2, pan body 3 is connected on the vee-block 2 through screw, and both sides are fixed with two beryllium-bronze substrates 501,502 before and after the pan body, and the substrate two ends are connected with the lumped mass piece.

As shown in Figure 3, have bellmouth 8 on the pan body 3.

As shown in Figure 4, symmetry is pasted with two groups of piezoelectric chips on the substrate 501, and every group of bimorph is uneven in length.

During the utility model work, four groups of bimorph swings forward or backward simultaneously under the excitation of the symmetrical wave signal of telecommunication on two substrates.When bimorph is swung forward, produce inertial impact force backward, mechanism moves backward and moves a step; When bimorph is swung at the same time backward, produce inertial impact force forward, mechanism moves forward a step.Because every group of two pairs of piezoelectric chips are uneven in length, the deflection during the bimorph swing is different, and the inertial impact force of generation is also different, and mechanism's distance with motion backward forward is different, and both differences are exactly the moving step length of a pulse excitation.Under the excitation of consecutive pulses, will realize continuous rectilinear motion on mechanism's macroscopic view.

Embodiment 2

As shown in Figure 5, rotary body 7 is placed on the pan body 3, has rectangular opening 9 on the said rotary body, utilizes screw that substrate 503 is fixed on the rotary body, is pasted with piezoelectric chip on the substrate, and two ends are connected with the lumped mass piece.

As shown in Figure 6, rotary body 7 lower ends are bullet, cooperate with the taper hole 8 of pan body, have rectangular opening 9 and screwed hole 10 on the rotary body.

As shown in Figure 7, antisymmetry is pasted with two groups of piezoelectric chips on the substrate 503, and every group of bimorph is uneven in length.

During the utility model work; Two groups of bimorphs are in the opposite direction at the excitation lower swing of the symmetrical wave signal of telecommunication, produce rightabout inertial impact force, to being formed centrally torque in the rotary body; Because piezoelectric chip is uneven in length; The torque of both direction is different, and the angular displacement that rotary body rotates is different, and both differences are exactly the rotation step-length of one-period.Under continuous signal excitation, will rotatablely move continuously on mechanism's macroscopic view.

Claims

1. an asymmetric piezoelectric inertia driver is characterized in that V-block and pan body link together; Be fixed with substrate on the pan body; The substrate two ends are connected with the lumped mass piece, and the piezoelectric chip of unequal length is bonded on the substrate, pan body both sides piezoelectric chip symmetric arrangement; Have bellmouth on the pan body, cooperate with rotary body lower end cone, connected mode is identical with pan body between rotary body, substrate, piezoelectric chip, the mass, and difference is the piezoelectric chip antisymmetry layout of rotary body two-side adhesive on substrate.

2. according to claim 1 described asymmetric piezoelectric inertia driver, it is characterized in that the piezoelectric chip of said substrate both sides is uneven in length.

3. according to claim 1 described asymmetric piezoelectric inertia driver, it is characterized in that, pass through cone match between said pan body and the rotary body.

4. according to claim 1 described asymmetric piezoelectric inertia driver, it is characterized in that said driver pumping signal is the symmetry waveform signal.