KR100381819B1 - Linear motor with electromagnetic clamper - Google Patents

Abstract

An object of the present invention is to provide a linear motor using an electromagnet clamper in a linear motor moving linearly and precisely.

According to the present invention, in a linear motor that moves linearly according to the displacement of the piezoelectric body, the wire 25 is wound in the form of a coil a plurality of times in the middle portion of the piezoelectric member, and the current 92 is applied through the wire 25. On both ends of the plurality of electromagnet clampers 20, which are ferromagnetic materials that change the direction of the magnetic field in accordance with the flow direction, the piezoelectric member 50 which stretches and connects the plurality of electromagnet clampers 20, and the plurality of electromagnet clampers 20, respectively. And a guide block 30 which is a ferromagnetic material that is in contact with and guides the movement of the electromagnet clampers 20. The magnetic field loop 95 which is generated in accordance with the direction of the current 92 applied to the wire 25 is It is formed to pass through the electromagnet clamper 20 and the guide block 30, the attraction force between the electromagnet clamper 20 and the guide block 30, or the magnetic field loop 96 is the electromagnet clamper 20 Outside) Is formed with a linear motor using a magnet clamper that can slide the magnet clamper 20 and the guide block 30 is relatively free to be provided.

Description

Linear motor with electromagnetic clamper

The present invention relates to a motor moving linearly, and more particularly, to a precision linear motor capable of generating very small displacement by using an electromagnet clamper and a piezoelectric body.

Currently used linear motor can be classified into precision servo motor, VCM (Voice Coil Motor) and piezoelectric motor. Precision servo motor is a device that can perform linear motion by attaching lead screw to the precision servo motor which rotates. . Such a precision servomotor has the advantage of a fast feed speed and a wide range of movement, but the precision is limited due to the backlash of the lead screw.

On the other hand, Figure 1 is a conceptual diagram showing a linear motor of the VCM method according to the prior art, Figure 2 is a conceptual diagram showing the displacement of the inertial drive method using a piezoelectric body according to the prior art, Figure 3 according to the prior art It is a conceptual diagram showing the displacement of the inch worm type using a piezoelectric body.

As shown in FIG. 1, in the VCM method, when a current flows in the coil 1, the coil 1 moves up and down by a magnetic field generated by the coil 1 and a magnetic field caused by the surrounding permanent magnets 2a and 2b. Done. Such VCM motor has the advantage of high precision and low price, but has a disadvantage that the moving range is limited to several mm.

As shown in Figures 2 and 3, there are two types of linear motor using such a piezoelectric material, an inertial drive method and an inchworm method.

FIG. 2 is a view showing an inertial driving method, which includes a stationary mass 5, an inertial mass 3, and a piezoelectric body 4. When the piezoelectric body 4 contracts at a slow speed and suddenly expands, the inertial mass 3 The stationary mass (5) moves because of the inertia force. If this process is repeated to accumulate displacement, the theoretically long moving range is obtained. Such inertial driving method has high precision and wide moving range, but has a disadvantage of slow moving speed.

In addition, as shown in Figure 3, Inchworm method (Inchworm) is the first and second piezoelectric body (8a, 8b) is located in the direction perpendicular to the longitudinal direction of the moving rod (9), such first, second The third piezoelectric body 8c connects the piezoelectric bodies 8a and 8b. Thus, the third piezoelectric body 8c is parallel to the moving rod 9.

In the first step, as shown in FIG. 3A, a voltage is applied to the first piezoelectric material 8a so that the first piezoelectric material 8a clamps the moving rod 9. At this time, no voltage is applied to the second and third piezoelectric bodies 8b and 8c.

In the next step, as shown in FIG. 3B, a voltage is applied to the third piezoelectric body 8c to displace the third piezoelectric body 8c in the longitudinal direction. At this time, the voltage is continuously applied to the first piezoelectric material 8a, and the voltage is not applied to the second piezoelectric material 8b. Therefore, the moving rod 9 clamped by the first piezoelectric body 8a moves by the displacement of the third piezoelectric body 8c.

In the next step, as shown in FIG. 3C, the voltage applied to the first piezoelectric body 8a is cut off and the voltage is applied to the second piezoelectric body 8b. Then, the moving rod 9 is clamped by the second piezoelectric body 8b.

In the next step, as shown in FIG. 3D, the voltage applied to the third piezoelectric material 8c is cut off. At this time, a voltage is continuously applied to the second piezoelectric material 8b to clamp the moving rod 9. As the four steps of (a), (b), (c), and (d) of FIG. 3 are performed, the movable rod 9 moves by one pitch P, that is, by the displacement of the third piezoelectric body 8c. .

The inch worm method requires at least three piezoelectric bodies 8a, 8b, and 8c, and has a disadvantage in that sliding may occur during clamping of the movable rod 9.

The present invention is provided to solve the problems of the prior art as described above, to provide a linear motor using an electromagnet clamper that can be clamped to the floor with a large force by using an electromagnetic force, and can be driven at a high frequency. There is this.

1 is a conceptual diagram showing a linear motor of the VCM method according to the prior art,

2 is a conceptual diagram showing the displacement of the inertial drive method using a piezoelectric body according to the prior art,

3 is a conceptual diagram showing a displacement displacement of the inch worm method using a piezoelectric body according to the prior art,

4 is a conceptual diagram illustrating a linear motor using an electromagnet clamper according to an embodiment of the present invention,

FIG. 5 is a conceptual diagram illustrating an operating principle of the electromagnet clamper shown in FIG. 4;

FIG. 6 is a conceptual diagram illustrating a movement mode according to a displacement of the piezoelectric body illustrated in FIG. 4.

♠ Explanation of symbols on the main parts of the drawing ♠

1: coil 4, 8a, 8b, 8c, 50: piezoelectric body

9: moving rod 20: electromagnet clamper

21: contact 23: core

25: wire 30: V block

32: V groove 40: permanent magnet

95, 96: magnetic field loop 95a, 96a: magnetic field generated in the core

According to the present invention for achieving the object as described above, in the linear motor that moves linearly according to the displacement of the piezoelectric body, the wire is wound a plurality of times in the form of a coil in the middle portion, the current of the current applied through the wire A plurality of electromagnet clampers which are ferromagnetic bodies whose direction of the magnetic field is changed in accordance with the flow direction, a piezoelectric body which is stretched by connecting the plurality of electromagnet clampers, and a ferromagnetic body which is in contact with both ends of the plurality of electromagnet clampers and guides the movement of the plurality of electromagnet clampers And a guide block, and a magnetic field loop generated according to the direction of the current applied to the wire passes through the electromagnet clamper and the guide block so that an attraction force acts between the electromagnet clamper and the guide block, or A magnetic field loop is formed outward through the electromagnet clamper For example, a linear motor using an electromagnet clamper in which the electromagnet clamper and the guide block slide relatively freely is provided.

In addition, according to the present invention, the electromagnet clamper is connected to the two contact portions of the triangular prism shape located at both ends, the one square surface of the two contact portion parallel to each other and the core wrapped around the wire, and the upper portion of the contact portion It includes a permanent magnet fixed to the square face toward, the square face toward the bottom of the contact portion is in contact with the guide block.

Further, according to the present invention, the guide block is formed with a V-shaped groove in the longitudinal direction of the piezoelectric body, the inclined surface of the groove is equal to the inclination angle of the square surface toward the lower portion of the contact portion.

According to the present invention, an electromagnet clamper of the plurality of electromagnet clampers is attached to the guide block, and the other electromagnet clamper is applied to each electromagnet clamper so as to be free to move. A linear motor using an electromagnet clamper in which a freely movable electromagnet clamper moves by the displacement of the piezoelectric body is provided.

In the following, with reference to the accompanying drawings a preferred embodiment of a linear motor using an electromagnet clamper according to the present invention will be described in detail.

4 is a conceptual diagram illustrating a linear motor using an electromagnet clamper according to an embodiment of the present invention, FIG. 5 is a conceptual diagram showing an operating principle of the electromagnet clamper shown in FIG. 4, and FIG. 6 is shown in FIG. 4. It is a conceptual diagram which shows the movement mode according to the displacement of the piezoelectric body.

As shown in FIG. 4, the V block 30 having the V groove 32 formed in the displacement movement direction of the piezoelectric body 50 is positioned. Then, the electromagnet clamper 20 is positioned to be in contact with both of the inclined surfaces of the V-groove 32 of the V-block 30. The electromagnet clamper 20 includes a triangular prism contact portion 21 and a core 23 connecting the two contact portions 21 at both ends, and the inclined surface and the contact portion of the V groove 32 of the V block 30 ( 21) are in contact with each other having a corresponding inclination angle. At this time, when looking at the shape of the two contact portion 21, one of the three quadrangular surface having a triangular prism is located so as to be symmetrical facing each other, the other two rectangular surfaces are positioned to face up and down. The core 23 connects the middle portions of the two contact portions 21 facing each other with the quadrangles.

These two electromagnet clampers 20 are located in the V groove 32 of the V block 30, and the piezoelectric member 50 connects each core 23 of the electromagnet clamper 20 to each other. On the other hand, the electromagnet clamper 20 and the V block 30 is a ferromagnetic material.

The wire 25 is wound around the core 23 of each electromagnet clamper 20 in the form of a solenoid coil. Therefore, the direction of the magnetic field generated in the electromagnet clamper 20 is determined according to the flow direction of the current flowing along the wire 25. According to the flow direction of the current 92, the contact portion 21 of the electromagnet clamper 20 is fixed to the inside of the V-groove 32 of the V-block 30 by the inclined surface and the attraction force, or is seated to move freely State, which will be described in detail in the operating relationship below.

On the other hand, the square surface facing the lower portion of the contact portion 21 having a triangular prism form is in contact with the inclined surface of the V groove 32, the permanent magnet 40 is fixed to the square surface facing upward. Thus, the position of the permanent magnet 40 is located on both sides of the opening of the V groove 32.

The operation relationship of the linear motor using the electromagnet clamper configured as described above will be described in detail.

As shown in FIGS. 5A and 5B, the directions of the magnetic fields 95a and 96a formed in the core 23 of the electromagnet clamper 20 change depending on the flow direction of the current 92.

In FIG. 5A, the magnetic fields 96b and 96c of the permanent magnet 40 and the magnetic field 96a generated in the core 23 do not pass through the V block 30, but on one side of the electromagnet clamper 20. A magnetic field loop 96 is formed which exits from the end and exits back to the other end. Therefore, since the magnetic field loop 96 does not pass through the V block 30, an extremely small attraction force acts between the electromagnet clamper 20 and the V block 30, but it is in a state that can freely slide.

In FIG. 5B, the magnetic field 41 of the permanent magnet 40 and the magnetic field 95a generated in the core 23 are added to the V block 30 through one end of the electromagnet clamper 20. The magnetic field 95b exits through the V block 30 and enters the other end of the electromagnet clamper 20 again (95c). Therefore, the magnetic field loop 95 is formed through the electromagnet clamper 20 and the V block 30, and the magnetic field flows through the loop 95 while attracting force between the electromagnet clamper 20 and the V block 30. Occurs.

Therefore, as shown in FIGS. 5A and 5B, the electromagnet clamper 20 is attached to the V-groove 32 of the V-block 30 or the V-block according to the flow direction of the current 92. It is located in the V groove 32 of the free state (30).

On the other hand, with reference to Figure 6 will be described the movement mode according to the displacement of the piezoelectric body.

First, when the flow direction of the current applied to the wire 25 is defined, the flow of the current when the electromagnet clamper 20 is attached to the V block 30 is called 'forward direction', and the electromagnet clamper 20 is V The flow of current when it is free inside the V-groove 32 of the block 30 is defined as 'reverse direction'. The left electromagnet clamper (hereinafter, referred to as a 'left clamper') 20L among the two electromagnet clampers 20 shown in FIG. 6 is a movable body.

FIG. 6A illustrates that the right clamper 20R is attached to the V block 30 by applying a forward current to the right electromagnet clamper (referred to as a 'right clamper') 20R. At this time, a reverse direction current is applied to the left clamper 20L, and the left clamper 20L is seated in the V-groove 32 of the V block 30 in a free state.

In FIG. 6B, a voltage is applied to the piezoelectric member 50 so that the piezoelectric member 50 is extended by the displacement. Then, the left clamper 20L fixed to the piezoelectric body 50 moves by the displacement of the piezoelectric body 50.

6C, the flow direction of the current 92 is switched so that the current 92 in the forward direction flows through the left clamper 20L. Then, the left clamper 20L is attached to the V block 30 in the state of advancing by the displacement of the piezoelectric body 50. At the same time, the flow direction of the current is switched so that the reverse current flows so that the right clamper 20R is free.

In this state, as shown in FIG. 6D, when the voltage applied to the piezoelectric body 50 is removed, the piezoelectric body 50 contracts. Then, the right clamper 20R in the free state is advanced by the movement displacement generated by the expansion and contraction of the piezoelectric body 50. When the processes of FIGS. 6 (a), 6 (b), 6 (c) and 6 (d) are repeatedly performed, the moving body of the left clamper 20L linearly advances by the displacement of the piezoelectric body 50.

In addition, when the left and right clampers 20L and 20R are attached to the V block 30, the respective magnetic forces generated in the permanent magnet 40 and the coil are attached to the V block 30 with the combined force of the left and right clampers 20L. , 20R is strongly attached to the V block 30 and does not slip.

As described in detail above, the linear motor using the electromagnet clamper of the present invention has an advantage that the linear motor has high reliability because no sliding occurs due to the displacement of the piezoelectric body due to the strong electromagnet clamper.

In addition, the strong electromagnet clamper has the advantage that the movement of the piezoelectric can be achieved quickly, the moving speed is fast.

The technical idea of the linear motor using the electromagnet clamper of the present invention has been described above with the accompanying drawings, but this is only illustrative of the best embodiment of the present invention and is not intended to limit the present invention. In addition, it is obvious that any person having ordinary skill in the art can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

Claims (4)

In a linear motor moving linearly according to the displacement of the piezoelectric body, A guide block formed with a linear groove, A plurality of electromagnet clampers positioned inside the grooves of the guide block and moving along the length of the grooves; A piezoelectric member which connects the plurality of electromagnet clampers and stretches in the longitudinal direction of the groove, The electromagnet clamper includes two contact portions positioned in contact with inner surfaces facing each other in the groove of the guide block, a core fixed at both ends to the two contact portions, respectively, wrapped in a coil, and an opening portion of the groove at the contact portion. Linear motor using an electromagnet clamper, characterized in that it has a magnet fixed to the portion facing toward. The method of claim 1, The groove of the guide block is a linear motor using an electromagnet clamper, characterized in that the inner surface is inclined V groove. The method according to claim 1 or 2, The contact portion has a shape of a triangular prism, the magnet is fixed to one surface of the three rectangular surfaces, the other surface is in contact with the inner surface of the groove of the guide block, the other surface is characterized in that one end of the core is fixed Linear motor using electromagnet clamper. delete