KR20150116714A - Y-type stator and ultrasonic motor thereof - Google Patents

Y-type stator and ultrasonic motor thereof Download PDF

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Publication number
KR20150116714A
KR20150116714A KR1020140042009A KR20140042009A KR20150116714A KR 20150116714 A KR20150116714 A KR 20150116714A KR 1020140042009 A KR1020140042009 A KR 1020140042009A KR 20140042009 A KR20140042009 A KR 20140042009A KR 20150116714 A KR20150116714 A KR 20150116714A
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South Korea
Prior art keywords
axes
rotor
phase
vibrator
shaped
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KR1020140042009A
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Korean (ko)
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정성수
박태곤
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창원대학교 산학협력단
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Priority to KR1020140042009A priority Critical patent/KR20150116714A/en
Publication of KR20150116714A publication Critical patent/KR20150116714A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/10—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/10—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors
    • H02N2/12—Constructional details

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  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)

Abstract

The present invention provides an ultrasonic motor with a simple and small structure, which can stably operate a rotor by three contact points provided for a Y-type stator in the shape of a thin film, and can control the rotating direction of the rotor by changing two phases of applied three-phase AC power supply.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an ultrasonic motor,

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a wavy vibrator and an ultrasonic motor using the wavy vibrator, and more particularly to a wavy vibrator that drives a rotor by three contact points of a wavy vibrator applying three- .

The motor is a key component of the related technology as the driving source of almost all equipment.

With the rapid development of the industry in recent years, the paradigm of modern industrial society has been restructured around high value-added knowledge-based industries such as IT (Information Technology) and NT (Nano Technology) and high-tech manufacturing industries requiring high precision. It is essential to develop a motor incorporating a new principle and a method that can maximize high integration, productivity, and high efficiency.

Conventional electronic motors can not be expected to advance remarkably due to limitations of magnetic and conductive materials, and therefore, there is a desperate need to develop actuators incorporating new principles and methods.

An ultrasonic motor has been proposed to solve the problem due to the limitation of the electromagnetic motor.

However, conventional ultrasonic motors are complicated in structure and difficult to miniaturize in size, and therefore have a high production cost and are not suitable for mass production.

Korean Patent Publication No. 10-2010-0049248 (May 12, 2010)

SUMMARY OF THE INVENTION The present invention has been made to overcome the problems of the prior art described above, and it is an object of the present invention to provide a wye-shaped vibrator having a simple structure by driving a rotor with three contact points provided in a thin- There is a purpose.

It is another object of the present invention to provide a wye-type vibrator capable of controlling the rotational direction of the rotor by using a three-phase power source having a phase difference of 120 占 and an ultrasonic motor using the same.

In order to achieve the above object, according to the present invention, there is provided an ultrasonic diagnostic apparatus comprising: a wye-shaped elastic body having first to third axes with an alphabetical letter Y on the basis of an inner center point thereof, A piezoelectric element attached to an upper surface and a lower surface of the shaft, respectively; And a control unit.

Further, the wi-shaped elastic body is characterized by being a thin thin film.

In addition, each of the first to third axes may include a fixed portion located between the two vibrating portions and the vibrating portion; And a control unit.

The two vibrating portions of the respective shafts are divided into a first vibrating portion and a second vibrating portion. The polarization directions of the piezoelectric elements attached to the upper and lower portions of the first vibrating portion and the polarization directions of the piezoelectric elements attached to the upper and lower portions of the second vibrating portion are opposite .

Further, the piezoelectric element is characterized by being a thin thin film which is long in the longitudinal direction.

Further, in the first to third axes, the angle between the axes is 120 DEG.

In addition, the first to third axes are provided in the shape of an English letter Y with reference to the inner center point, and are attached to the upper and lower surfaces of the first to third axes, respectively, to a wye-shaped elastic body having the same wedge- A wobbler including a piezoelectric element, a rotor located at a center of a hollow formed inside the wobbler and rotating due to contact with the wobbler; And a control unit.

Further, the contact point between the wob-shaped vibrator and the rotor is three.

Also, a three-phase AC power source having a phase difference of 120 ° is applied to each of the piezoelectric elements, and the phase of two phases of the three-phase AC power source is changed to change the direction of rotation of the rotor.

In addition, the three contact points sequentially generate elliptical displacement when three-phase AC power is applied.

The wye-shaped vibrator according to the present invention and the ultrasonic motor using the wye-shaped vibrator according to the present invention can be miniaturized in size and simple in structure, thereby reducing the production cost and being suitable for mass production.

In addition, there is an effect that the rotation direction of the rotor can be freely controlled by changing the phase of two phases among three-phase power supplies.

1 is a view showing an ultrasonic motor according to the present invention.
2 is a view showing a wye-shaped elastic body of the wavy vibrator according to the present invention.
3 is a view showing a wye-shaped vibrator with a piezoelectric element according to the present invention.
4 is a view for explaining the polarization direction of the piezoelectric element.
FIG. 5 is a view showing an elliptical deformation of a contact point and a three-phase AC power source applied to a wye-shaped vibrator according to the present invention.
6 is a view showing a rotating operation of the rotor.

The present invention may have various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing an ultrasonic motor according to the present invention.

As shown in FIG. 1, the ultrasonic motor according to the present invention includes a Y-shaped (hereinafter referred to as a "wye") vibrator 100 for generating vibration upon application of AC power, and an elliptical displacement And a rotor (300) rotated by the rotor (300).

Here, the wye-shaped vibrator 100 includes a wye-shaped elastic body 110 and piezoelectric elements 200 to 250, which will be described later.

The wye-shaped vibrator 100 according to the present invention will be described with reference to Figs. 2 and 3. Fig.

2 is a view showing a wye-shaped elastic body of the wavy vibrator according to the present invention.

The wye-shaped elastic body 110 is composed of a first axis A, a second axis B and a third axis C and shows a wye shape at a constant angle between the axes A to C, Preferably, the angle between the axes A to C is 120 °.

In the inside of the wye-shaped elastic body 110, a hollow 140 of the same wye shape is formed so that the rotor 300 can be driven by three contact points.

Accordingly, the first axis A has a "C" shape including the first vibration portion 111, the second vibration portion 112, and the first fixing portion 117. The second axis B comprises a third vibration section 113, a fourth vibration section 114 and a second fixing section 118. The third axis C is composed of a fifth vibration section 115, Quot; C " shape comprising the sixth vibration portion 116 and the third fixing portion 119. [

Each of the vibration units 111 to 116 generates vibration by deformation of a piezoelectric element to be described later. The fixing units 117 to 119 are fixed to a separate bracket or the like not shown, 116).

The wi-shaped elastic body 110 may be made of iron, copper, brass or aluminum as a material of the wye-shaped elastic body 110. The wye-shaped elastic body 110 may be a thin- Can easily be released.

Next, Fig. 3 will be described to explain the piezoelectric elements 200 to 250. Fig.

3 is a view showing a wye-shaped vibrator with a piezoelectric element according to the present invention.

The piezoelectric elements 200 to 250 are formed in a thin plate shape long in the longitudinal direction. These piezoelectric elements 200 to 250 are formed of a pair of the upper plate and the lower plate and attached to the upper and lower surfaces of the first to sixth vibration units 111 to 116, respectively. Here, the upper plate and the lower plate of the piezoelectric elements 200 to 250 need not be constant in size, but it is preferable that piezoelectric elements of the same size are attached.

More specifically, when piezoelectric elements 210a and 210b are attached to predetermined positions on the upper surface and the lower surface of the first vibrating unit 111 and attached to the upper surface of the piezoelectric vibrating unit 210a, As shown in FIG. Accordingly, since the piezoelectric elements 200 to 250 are attached to the upper and lower surfaces of the first to sixth vibration units 111 to 116, twelve piezoelectric elements are attached to the wye-shaped elastic body 110 as a whole.

Generally, the piezoelectric elements 200 to 250 can be bonded to the wavy elastic body 110 using a bonding agent such as epoxy. In order to compensate for the drawback that the adhesive strength is lowered, it is preferable to use dry bonding in a heating furnace.

In order to allow the contact points (a, b, c) of the wavy elastic body 110 for rotating the rotor 300 to move smoothly in the elliptic shape in the bonding, The elements 200 to 250 should not touch each other (the contact points will be described later).

If the piezoelectric elements 200 to 250 are partially overlapped with the fixed portions 117 to 119 of the wye-shaped elastic body 110, the fixing portion may be damaged or the fixing may be lost due to vibration such as twisting, a, b, and c, it may affect the driving of rotating the rotor by deforming the elliptical displacement of the contact points (a, b, c).

Therefore, the piezoelectric elements 200 to 250 do not overlap with the fixed portions 117 to 119 and are spaced apart from each other by a predetermined distance so as not to be adjacent to the contact points a, b and c, And should be attached to the upper and lower surfaces of the vibration units 111 to 116 so that the piezoelectric elements 200 to 250 do not touch each other.

The wye-shaped vibrator 100 according to the present invention rotates the rotor 300 by three contact points.

3, an a contact point between the first vibrating section 111 and the sixth vibrating section 116, a b contact point between the fifth vibrating section 115 and the fourth vibrating section 114, There is a c-contact point between the east portion 113 and the second vibration portion 112, and the rotor 300 is rotated by the frictional force according to the elliptical displacement of the three contact points. The elliptical displacement of the contact point will be described in detail later in the operating characteristics.

The structure of the wye-shaped vibrator 100 and the ultrasonic motor using the wye-shaped vibrator 100 according to the present invention has been described above, and the operation characteristics will be described below.

4 is a view for explaining the polarization direction of the piezoelectric element.

Since the piezoelectric elements 200 to 250 generate electricity proportional thereto when mechanical pressure or external force is applied to the piezoelectric elements 200 to 250, vibrations that are periodically deformed are generated inversely when the AC power is applied to the piezoelectric elements 200 to 250 Principles.

4, when the S phase AC power is applied to the piezoelectric elements 200 and 210 attached to the upper and lower surfaces of the first and second vibration parts 111 and 112, And when the polarization direction is periodically changed according to the alternating current power, the piezoelectric elements 200 and 210 are periodically deformed to cause the first and second vibration parts 111 and 112 to vibrate.

Similarly, when the AC power of T phase is applied to the piezoelectric elements 240 and 250 attached to the upper and lower surfaces of the third and fourth vibration units 113 and 114, the piezoelectric elements 240 and 250 are periodically deformed, 3 and the fourth vibrating sections 113 and 114 are vibrated.

When the R-phase AC power is applied to the piezoelectric elements 230 and 220 attached to the upper and lower surfaces of the fifth and sixth vibration units 115 and 116, the piezoelectric elements 220 and 230 are periodically deformed, 5 and the sixth vibrating sections 113, 114 are vibrated.

When the first to sixth vibration units 111 to 116 are vibrated by applying AC power to the piezoelectric elements 200 to 250 as described above, the three contact points of the wavy vibrator according to the present invention deform in an elliptical shape.

FIG. 5 is a view showing an elliptical deformation of a contact point and a three-phase AC power source applied to a wye-shaped vibrator according to the present invention.

The alternating current power applied to the piezoelectric elements 200 to 250 has a phase difference of 120 degrees and a resonance frequency in a frequency band of 20 kHz or more. As described above, when the AC power source is applied, each of the vibration units 111 to 116 periodically deforms, so that each contact point a, b, and c generates an elliptical displacement.

Referring to Fig. 5, at any time t0, the position of the a contact point rotates in the clockwise direction as time elapses from t1 to t3 to form an elliptical displacement.

Likewise, the contact points b and c also form an elliptical displacement with the position of the contact point rotating clockwise from any time t0 to t3.

In addition, the a to c contact points sequentially form an elliptical displacement, and the rotor 300 is rotated by friction with each contact point.

Since the three-phase AC power is applied to the piezoelectric elements 200 to 250, when the phases of two phases of the three-phase power supply are changed, the a to c contact points are sequentially rotated in the counterclockwise direction, . Therefore, the rotational direction of the rotor 300 can be freely controlled.

For example, if the R phase power source is the primary power source and the T phase power source is 120 degrees faster and the S phase power source is 120 degrees slower, if the rotor 300 rotates clockwise, On the other hand, when the T phase power source is 120 degrees slower and the S phase power source is 120 degrees faster, the rotor 300 rotates counterclockwise.

Refer to FIG. 6 for concretely explaining the rotation operation of the rotor 300. FIG.

6 is a view showing a rotating operation of the rotor.

At any time t0, the rotor 300 is in contact with the a contact point. Therefore, when the a contact point forms an elliptical displacement in the clockwise direction (see the arrow direction in the drawing), the rotor 300 rotates in the counterclockwise direction due to the frictional force.

At any time t1, the b contact point forms an elliptical displacement in the clockwise direction, and the frictional force causes the rotor 300 to rotate in the counterclockwise direction.

At time t2, the contact points b and c simultaneously contact the rotor 300, causing the rotor 300 to rotate in a counterclockwise direction.

Similarly, even at time t3, the c-contact point forms an elliptical displacement in the clockwise direction, so that the rotor 300 rotates counterclockwise.

As described above, when the phases of two phases of the three phase power sources to be applied are changed, the contact points a to c generate an elliptical displacement in a counterclockwise direction, thereby controlling the rotor 300 to rotate in a clockwise direction.

As described above, the wavy vibrator according to the present invention and the ultrasonic motor using the wavy vibrator can be miniaturized in size using a thin film type wye vibrator, and the structure is simple, and the phase of two phases of the three- There is an effect that the direction of rotation of the electron can be freely controlled.

The embodiments of the present invention described in the present specification and the configurations shown in the drawings relate to the most preferred embodiments of the present invention and are not intended to encompass all of the technical ideas of the present invention so that various equivalents It should be understood that water and variations may be present. Therefore, it is to be understood that the present invention is not limited to the above-described embodiments, and that various modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. , Such changes shall be within the scope of the claims set forth in the claims.

100: wye-shaped vibrator
110: wye-shaped elastic body
300: rotor

Claims (10)

A wye-shaped elastic body having first to third axes in the shape of an alphabet letter Y with respect to an inner center point and having the same wedge-shaped hollow therein; And
A piezoelectric element attached to upper and lower surfaces of the first to third axes, respectively;
Shaped vibrator. The method according to claim 1,
Wherein the wavy elastic body is in the form of a thin film. The method according to claim 1,
Wherein each of the first to third axes comprises:
Two vibrating parts; And
A fixing part located between the vibrating parts;
Shaped vibrator. The method of claim 3,
The two vibrating parts of each axis are divided into a first vibrating part and a second vibrating part,
Wherein the polarization direction of the piezoelectric element attached on the upper and lower sides of the first vibration section and the polarization direction of the piezoelectric element attached on the upper and lower sides of the second vibration section are opposite to each other. The method according to claim 1,
Wherein the piezoelectric element has a thin thin film shape that is long in the longitudinal direction. The method according to claim 1,
Wherein an angle between each of the first to third axes is 120 °. The first to third axes are arranged in the shape of an alphabet letter Y with respect to an inner center point of the first and second axes and the first and second axes are connected to the upper and lower surfaces of the first to third axes, A wobbling type oscillator including: And
And a rotor located at a hollow center portion formed in the wavy vibrator and rotating due to contact with the wavy vibrator. 8. The method of claim 7,
And the contact point between the wob-shaped vibrator and the rotor is three. 8. The method of claim 7,
Wherein a three-phase AC power source having a phase difference of 120 degrees is applied to each of the piezoelectric elements, and a phase of two phases of the three-phase AC power source is changed to change the direction of rotation of the rotor. 9. The method of claim 8,
Wherein the three contact points sequentially generate elliptical displacement when three-phase alternating current power is applied.
KR1020140042009A 2014-04-08 2014-04-08 Y-type stator and ultrasonic motor thereof KR20150116714A (en)

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