CN107124119A - A kind of pair of butterfly stator piezoelectricity straight line driver - Google Patents

Abstract

The invention discloses a kind of pair of butterfly stator piezoelectricity straight line driver, belong to precision actuation technical field.Including butterfly stator 1 (1), butterfly stator 2 (2), mover (3), pedestal (4), wherein butterfly stator 1 (1) and butterfly stator 2 (2) specular are placed on mover (3) both sides, with mover (3) Elastic Contact, while being fixedly mounted on pedestal (4).Butterfly stator 1 (1) is identical with butterfly stator 2 (2) structure；Apply the sinusoidal drive electric signal of half period more delayed than butterfly stator 1 (1) to butterfly stator 2 (2), butterfly stator 1 (1) and butterfly stator 2 (2) alternately stepping, mover (3) motion is driven, effectively overcomes mover (3) to retract.The method have the advantages that simple and compact for structure, stroke is big, precision is high, load is big, effectively suppress to retract, available for fields such as micro-nano technology, space flight and aviation, precision optics.

Description

A Piezoelectric Linear Actuator with Double Butterfly Stators

technical field

The invention discloses a double-butterfly stator piezoelectric linear driver, which belongs to the technical field of precision driving.

Background technique

In recent years, with the development of machinery, the existing driving devices can no longer meet people's needs. All kinds of mechanical equipment tend to be miniaturized, and there is an urgent need for ultra-precision micro-drive mechanisms. Piezoelectric ceramics have the advantages of stable output displacement with micro-nanometer precision, good linearity of displacement, convenient control, and high resolution. Small drivers with piezoelectric ceramics as the core are gradually being applied. Most of the piezoelectric drive mechanisms currently on the market have disadvantages such as complex devices, small strokes, low precision, and small loads.

Contents of the invention

In order to realize the combination of large stroke, high precision, large load and restraining the retraction of movers, the invention discloses a piezoelectric linear driver with double butterfly stators.

The present invention is realized through the following technical solutions:

A double-butterfly stator piezoelectric linear drive, characterized in that it includes a butterfly stator 1, a butterfly stator 2, a mover, and a base, wherein the butterfly stator 1 and the butterfly stator 2 are mirror-symmetrically placed on both sides of the mover , in elastic contact with the mover, and fixedly installed on the base at the same time; the butterfly stator 1 includes a rigid fixed seat and a butterfly vibrator, and the four ends of the butterfly wings of the butterfly vibrator are fixedly installed on the rigid fixed seat; the described The butterfly vibrator includes a piezoelectric bimorph 1, a piezoelectric bimorph 2, a butterfly-shaped elastic substrate, and an arc-shaped driving foot. The piezoelectric bimorph 1 and piezoelectric bimorph 2 are symmetrically bonded on both sides of the butterfly-shaped elastic substrate ; The coefficient of friction of the left arc-shaped driving foot set by the arc-shaped driving foot is greater than the right arc-shaped driving foot; Stator 2 applies a driving signal that is half a period (T/2) behind butterfly stator 1, and the arc-shaped driving foot produces left and right reciprocating deformation, and the friction force generated by the left arc-shaped driving foot is greater than that of the right arc-shaped driving foot. Stator 1 and butterfly stator 2 move alternately; butterfly stator 1 deforms to the left, and its right arc-shaped driving foot produces frictional resistance; butterfly-shaped stator 2 deforms to the right, and its left arc-shaped driving foot produces frictional driving force , the friction driving force is greater than the friction resistance, and the mover is driven to move to the right; the butterfly stator 1 deforms to the right, and its left arc-shaped driving foot generates friction driving force, and the butterfly stator 2 deforms to the left, and its right arc drives The foot generates frictional resistance, and the frictional driving force is greater than the frictional resistance, driving the mover to move to the right; the butterfly stator 1 and the butterfly stator 2 step alternately so that the mover always moves to the right.

The friction coefficient of the left arc-shaped driving foot arranged on both sides of the arc-shaped driving foot is higher than that of the right arc-shaped driving foot; two sinusoidal driving electrical signals with a phase difference of T/2 are applied to the piezoelectric bimorph 1 and the piezoelectric bimorph 2, The piezoelectric bimorph 1 and the piezoelectric bimorph 2 alternately vibrate up and down, so that the contact point between the arc-shaped driving foot and the mover swings back and forth left and right, driving the mover to move to the right.

The beneficial effects of the invention are: simple and compact structure, large stroke, load direction perpendicular to driving force, large load, and can effectively overcome retreat.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of butterfly stator of the present invention;

Fig. 3 is a structural schematic diagram of a butterfly vibrator of the present invention;

Fig. 4 is the working state diagram of the stator of the present invention;

Fig. 5 is a working principle diagram of the present invention;

Fig. 6 is a schematic diagram of the drive electrical signal waveform of the butterfly stator 1 of the present invention;

FIG. 7 is a schematic diagram of the electric signal waveform for driving the butterfly stator 2 of the present invention.

Among them: 1: butterfly stator 1; 1-1: rigid fixed seat; 1-2: butterfly vibrator; 1-2-1: piezoelectric bimorph 1; 1-2-2: piezoelectric bimorph 2; 1 -2-3: Butterfly elastic base plate; 1-2-4: Arc driving foot; 1-2-4-1: Left arc driving foot; 1-2-4-2: Right arc driving foot; 2 : butterfly stator 2; 3-mover; 4: base.

detailed description

The accompanying drawings described here are used to provide a further understanding of the present invention, and constitute a part of the application. The schematic examples and descriptions of the present invention are used to explain the present invention, and do not constitute improper limitations to the present invention.

Referring to Figures 1 to 7, this embodiment provides a piezoelectric linear actuator with double butterfly stators, which is characterized in that it includes a butterfly stator 1 (1), a butterfly stator 2 (2), a mover (3 ), the base (4), in which the butterfly stator 1 (1) and the butterfly stator 2 (2) are mirror-symmetrically placed on both sides of the mover (3), elastically contacting the mover (3), and fixedly installed on the base On the seat (4); the butterfly stator 1 (1) includes a rigid fixed seat (1-1), a butterfly vibrator (1-2), and the four ends of the butterfly wings of the butterfly vibrator (1-2) are fixedly installed On the rigid mount (1-1); the butterfly vibrator (1-2) includes a piezoelectric bimorph 1 (1-2-1), a piezoelectric bimorph 2 (1-2-2), a butterfly shaped elastic substrate (1-2-3), arc-shaped driving foot (1-2-4), the piezoelectric bimorph 1 (1-2-1) and piezoelectric bimorph 2 (1-2-2 ) are symmetrically bonded to both sides of the butterfly-shaped elastic substrate (1-2-3); The coefficient of friction is greater than that of the right arc-shaped driving foot (1-2-4-2); the butterfly stator 1 (1) and the butterfly stator 2 (2) have the same structure; apply a driving electric signal to the butterfly stator 1 (1), and the Butterfly stator 2 (2) applies a driving electrical signal that is half a cycle (T/2) behind butterfly stator 1 (1), and the arc-shaped driving feet (1-2-4) produce left and right reciprocating deformation, and the left arc The friction generated by the drive foot (1-2-4-1) is greater than that of the right arc drive foot (1-2-4-2), and the butterfly stator 1 (1) and the butterfly stator 2 (2) alternate stepping motion ; Butterfly stator 1 (1) deforms to the left, its right arc-shaped driving foot (1-2-4-2) produces frictional resistance, butterfly-shaped stator 2 (2) deforms to the right, and its left arc-shaped driving foot (1-2-4-1) generates a frictional driving force, which is greater than the frictional resistance, driving the mover (3) to move to the right; the butterfly stator 1 (1) is deformed to the right, and its left arc-shaped driving foot (1-2-4-1) generates friction driving force, the butterfly stator 2 (2) deforms to the left, and its right arc-shaped driving foot (1-2-4-2) generates friction resistance, and the friction driving force is greater than the friction The resistance drives the mover (3) to move to the right; the butterfly stator 1 (1) and the butterfly stator 2 (2) step alternately so that the mover (3) always moves to the right.

The friction coefficient of the left arc-shaped driving foot (1-2-4-1) arranged on both sides of the arc-shaped driving foot (1-2-4) is higher than that of the right arc-shaped driving foot (1-2-4-2); Piezoelectric bimorph 1 (1-2-1) and piezoelectric bimorph 2 (1-2-2) apply two sinusoidal drive electrical signals with a phase difference of T/2, and piezoelectric bimorph 1 (1-2-1 ) and the piezoelectric bimorph 2 (1-2-2) vibrate alternately up and down, so that the contact point between the arc-shaped driving foot (1-2-4) and the mover (3) reciprocates left and right, driving the mover (3) to right movement.

Claims (2)

1. a kind of pair of butterfly stator piezoelectricity straight line driver, it is characterised in that：Including butterfly stator 1 (1), butterfly stator 2 (2), Mover (3), pedestal (4), wherein butterfly stator 1 (1) and butterfly stator 2 (2) specular are placed on mover (3) both sides, with moving Sub (3) Elastic Contact, while being fixedly mounted on pedestal (4)；Described butterfly stator 1 (1) include rigidly fix seat (1-1), Butterfly oscillator (1-2), the end of butterfly wing four of butterfly oscillator (1-2), which is fixedly mounted on, to be rigidly fixed on seat (1-1)；Described butterfly is shaken Sub (1-2) includes piezoelectric bimorph 1 (1-2-1), piezoelectric bimorph 2 (1-2-2), butterfly elastic base plate (1-2-3), arc driving Foot (1-2-4), described piezoelectric bimorph 1 (1-2-1) and piezoelectric bimorph 2 (1-2-2) are symmetrically bonded in butterfly elastic base plate (1-2-3) both sides；The coefficient of friction for the left arc driving foot (1-2-4-1) that described arc driving foot (1-2-4) is set is more than Right arc driving foot (1-2-4-2)；Butterfly stator 1 (1) is identical with butterfly stator 2 (2) structure；Apply to butterfly stator 1 (1) and drive Dynamic electric signal, applies the driving electric signal of half period (T/2) more delayed than butterfly stator 1 (1) to butterfly stator 2 (2), and arc drives Action spot (1-2-4) produces bilateral reciprocation deformation, and the frictional force that left arc driving foot (1-2-4-1) produces is driven more than right arc Action spot (1-2-4-2), butterfly stator 1 (1) and butterfly stator 2 (2) alternating step motion；Butterfly stator 1 (1) deformation to the left, Its right arc driving foot (1-2-4-2) produces frictional resistance, butterfly stator 2 (2) deformation to the right, its left arc driving foot (1- Friction drive 2-4-1) is produced, friction drive is more than frictional resistance, drives mover (3) lateral movement to the right；Butterfly stator 1 (1) deformation to the right, its left arc driving foot (1-2-4-1) generation friction drive, butterfly stator 2 (2) deformation to the left, its Right arc driving foot (1-2-4-2) produces frictional resistance, and friction drive is more than frictional resistance, and driving mover (3) is transported to the right It is dynamic；Alternately stepping makes mover (3) lateral movement to the right all the time for butterfly stator 1 (1) and butterfly stator 2 (2).

2. a kind of pair of butterfly stator piezoelectricity straight line driver according to claim 1, it is characterised in that：Arc driving foot The coefficient of friction for the left arc driving foot (1-2-4-1) that (1-2-4) both sides are set is higher than right arc driving foot (1-2-4-2)；Give Piezoelectric bimorph 1 (1-2-1) and piezoelectric bimorph 2 (1-2-2) apply two phase difference T/2 sinusoidal drive electric signal, piezoelectricity Twin lamella 1 (1-2-1) and piezoelectric bimorph 2 (1-2-2) vibrate alternatively up and down, make arc driving foot (1-2-4) and mover (3) Contact point or so reciprocally swinging, driving mover (3) is moved right.