KR100407897B1 - A Fine Actuator Stage Using Moving Magnet Type Of VCM - Google Patents

Abstract

The present invention relates to a precision actuator stage device using a moving magnet type VCM, comprising a hollow shaft and a coil fixed to a central portion of the hollow shaft, and a starting induction unit fixedly disposed so that both sides are exposed to a penetrating portion of the inner side of the plate. Magnetically coupled to a pair of yokes and the yoke that are symmetrically fitted to the hollow shaft to allow relative linear driving and rotation about the hollow shaft based on the magnetic force of the coil, respectively, and are respectively fitted to both ends of the hollow shaft to coil Characterized in that consisting of a starting unit consisting of a starting magnet facing each other with different polarity. At this time, it is preferable that the three maneuvering units are arranged on the plate taking a triangular sphere at an angle of 60 ° to each other.

Description

A Fine Actuator Stage Using Moving Magnet Type Of VCM}

The present invention relates to a stage device for an actuator, and more particularly, an actuator is disposed in a triangular sphere on a plate so as to overcome the existing multilayer structure, and by replacing the starting magnet with a coil to which a current is applied, a change in relative magnetic force The relative magnetic levitation of the starting magnet relative to the coil is realized to enable a more smooth linear driving and rotation, and ultimately relates to a precision actuator stage device using a starting magnet type VCM that can realize a precise and quick driving .

Generally, actuators or actuators applied to precision driving range from the most common small electric motors to those using piezoelectric elements and those using electromagnetic induction principles. Among them, the conventional precision actuator using the principle of electromagnetic induction is typically used with a linear motor called VCM.

The VCM (Voice Coil Motor or less VCM) applies the principle of vibration of the speaker to the driver, and the starter reciprocates according to the polarity of the current applied to the coil.

The actuator realized by applying the VCM is largely a starting coil type and a starting magnet type. The starting coil type is a coil reciprocating with respect to a relative magnetic force of a magnet, and the starting magnet type is a relative magnetic force of a coil. The magnet reciprocates.

Among these conventional VCM actuators of the starting coil type, the winding is complicated, and since the coil is driven, there is a problem that the point of action of the force is changed every time.

In addition, although the conventional driving magnet type VCM driver is capable of linear driving, there is a problem that the range of rotational movement around one axis is small.

In addition, since the VCM driver of the starting magnet type needs to have a multi-layer structure in order to be smoothly driven, its weight and volume are relatively large, thereby limiting the scope of the applied field.

Therefore, the present invention has been derived in view of the above-described conventional problems, and a first object of the present invention is to provide a precise actuator stage device using a moving magnet type VCM capable of relatively linear driving and rotation about a point. will be.

A second object of the present invention is to provide a precise actuator stage device using a starting magnet type VCM capable of relatively linear driving and rotation of a starting magnet magnetized by a coil induced current.

Objects of the present invention, the hollow shaft 12 and the hollow shaft 12 is composed of a coil 11 is fixed to the center portion is fixedly disposed so that both sides are exposed to the through portion of the inner side of the plate 20 of a predetermined thickness. Starting guide unit 10; And

A pair of yokes 32 and a yoke 32 and the yoke 32 that are symmetrically fitted to the hollow shaft 12 to enable linear driving and rotation about the hollow shaft 12 based on the magnetic force of the coil 11. It is coupled to each of the magnetic force, and is coupled to each end of the hollow shaft 12, the starting unit 30 consisting of a starting magnet 31 facing each other with different polarities with respect to the coil 11; It is achieved by a precision actuator stage device using a moving magnet type VCM.

Here, it is preferable that the three induction units 10 are arranged on the plate 20 so that the three take triangular spheres at an angle of 60 ° to each other.

In addition, the starting magnet 31 is preferably a permanent magnet capable of generating and maintaining a stable magnetic field without receiving electrical energy from the outside.

In addition, the starting magnet 31 is preferably provided with two pairs, one pair each in the yoke 32 to be symmetrical about the coil (11).

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings.

1 is a front view of a precision actuator stage device using a moving magnet type VCM according to the present invention;

2 is an exploded perspective view of the stage device;

3 is a perspective view of a combined starting guide unit and a starting unit according to the present invention;

4 is a front view of the combined starting guide unit and the starting unit,

5 is a cross-sectional view taken along the line A-A of FIG.

<Description of the code according to the main part of the drawing>

10: starting guide unit 11: coil

12: hollow shaft 20: plate

30: starting unit 31: starting magnet

32: yoke 100: precision actuator stage device

Prior to the description of the precision actuator stage device using the moving magnet type VCM according to the present invention, the VCM (Voice Coil Motor) consistently used in the present invention is a "motor in which the mover reciprocates" and vibrates a general dynamic speaker. It is a kind of linear motor developed by applying the principle. It is used as a driver of a floppy disk drive or a hard disk drive by applying a current to a voice coil located in a magnetic field of a permanent magnet, in which force is generated in a direction perpendicular to the magnetic field and current according to Fleming's left-hand law.

Next, with reference to the accompanying drawings with respect to the precision actuator stage device using a moving magnet type VCM according to the present invention will be described.

1 is a front view of a precision actuator stage apparatus using a moving magnet type VCM according to the present invention, FIG. 2 is an exploded perspective view of the stage apparatus, and FIG. 3 is a perspective view of a combined starting guide unit and a starting unit according to the present invention. 4 is a front view of the combined starting guide unit and the starting unit, and FIG. 5 is a cross-sectional view taken along line AA of FIG. 4.

As shown in FIGS. 1, 2, 3, 4, and 5, the stage apparatus 100 is made according to Lorentz's law, and a coil 11 that generates a magnetic force when a current is applied is generally used. Precise driving principle of magnetic levitation by electromagnetic induction, which allows the driving magnet 31 to be linearly driven or rotated relative to the coil 11 according to the magnetic field between the moving magnets 31 having the characteristics of a permanent magnet. It is to apply to the field.

The stage device 100 includes a hollow shaft 12 and a coil 11 having the hollow shaft 12 positioned on a central portion thereof, and a starting induction unit fixed to expose both sides to a penetrating portion of the inner side of the plate 20 ( 10), a pair of yoke 32 fitted to the hollow shaft 12 and two pairs of moving magnets magnetically coupled to both sides of the coil 11 by magnetic force coupling to the yokes 32, respectively. It consists of a starting unit 30 consisting of (31). Here, the starting induction unit 10 is fixed to the plate 20, agglomerated with a conductor wire wound several times to express a magnetic force with an applied current It consists of a coil 11 functioning like, and a hollow shaft 12 fixed to the center of the coil (11).

In addition, the starting unit 30 is connected to the starting guide unit 10 through the hollow shaft 12, the pair of yoke 32 is fixed to both sides of the hollow shaft 12.

In addition, the movable magnet 31 is attached to the inner side surface of each yoke 32 symmetrically about the hollow shaft 12, and thus, together with the yoke 32, a magnetic force relative to the coil 11 is obtained. To drive.

At this time, the starting magnet 31 has a composition in which the opposite polarities with respect to the coil 11, that is, opposite polarities such as the N pole versus the S pole, replace the coil 11 with the coil 11 therebetween. In addition, the yoke 32 and the hollow shaft 12 may be linearly driven in the horizontal direction (X, Y axis direction).

In addition, the starting magnet 31 is controlled by the polarity and the magnitude of the current applied to the coil 11, the hollow shaft 12 and the yoke 32 with respect to the hollow shaft (12, Z axis) and In addition, it can be rotated by the desired rotation angle θ.

This is due to Lorentz's law that the direction of force is perpendicular to the direction of magnetic flux and current when current flows in the flow of magnetic flux, and the forces pushed by each other by the magnetic force of the starting magnet 31 with respect to the coil 11. In the end, according to Newton's third law of action-reaction, the starting magnet 31 and the yoke 32 are opened at a relatively constant interval relative to the coil 11, which in turn causes a magnetic force. It can be said to be levitation by

On the contrary, it is possible for the coil 11 to be magnetized relative to the starting magnet 31 and the yoke 32, and thus, the coil 11 is caused by the magnetic force between the coil 11 and the starting magnet 31 by the magnetic force. Relative magnetic levitation between 11 and the starting magnet 31 can be realized. At this time, air between the coil 11 and the starting magnet 31 is used for smooth operation of the starting magnet 31. Since it acts as a bearing, no other disturbances that hinder the drive other than the slight friction caused by air occur.

Accordingly, the starting magnet 31 and the yoke 32 are magnetically supported by the air layer existing therebetween with respect to the coil 11 facing each other. At this time, the starting magnet 31 and the yoke ( 32 is fitted to the hollow shaft 12 is capable of integrally horizontal or rotational movement.

On the other hand, the maneuvering induction unit 10 is disposed on the plate 20 so that a total of three take the equilateral triangle composition at an angle of 60 ° to each other, thereby forming a mutually symmetrical arrangement.

In addition, the maneuvering unit 30 connected to the maneuvering induction unit 10 also takes the composition of an equilateral triangle having a mutual angle of 60 ° to achieve symmetry, thereby achieving symmetry.

At this time, when a current is applied to the coils 11 of each of the starting guide units 10, the starting magnet 31 and the yoke 32 are moved together with the hollow shaft 12 to the magnetic force relative to the fixed coil 11. Mutually spaced apart by this, it is possible to drive and rotate linearly. In the precision actuator stage device 100 using the starting magnet type VCM according to the present invention as described above, the starting guide unit 10 is the plate In (20), a total of three forms of equilateral triangular composition, in addition to varying numbers, are two pairs of symmetrical forms, four of which form squares, and five of them form an octagonal composition. Depending on the arrangement, the form can be used in different ways.

According to the precise actuator stage apparatus using the moving magnet type VCM according to the present invention as described above, unlike the conventional actuator type in which the coil is driven to change the point of action of the force, the magnet is started, so the point of action of the force is fixed. It is possible to drive more precisely, and there is a feature that the error due to heat generated by the operation is reduced.

In addition, since the actuator consisting of the starting unit and the starting guide unit has an equilateral triangle structure that maintains an angle of 60 ° (or 120 °) to each other, it is not necessary to arrange them in a multi-layer, so that the weight and volume are relatively small, so that the applications It becomes wider and has an effect of facilitating assembly and fabrication.

In addition, the relative magnetic levitation of the starting magnet and the yoke is possible due to the relative magnetic force of the starting magnet relative to the coil acting as an electromagnet, so that it is possible to smoothly linearly rotate and rotate the hollow shaft together with the hollow shaft. It works.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, various other modifications and variations may be made without departing from the spirit and scope of the invention. Accordingly, it is intended that the appended claims cover such modifications and variations as fall within the true scope of the invention.

Claims (4)

A hollow shaft 12 and a coil 11 fixed to a central portion of the hollow shaft 12 and a starting induction unit 10 fixedly disposed so that both sides are exposed at a penetrating portion of an inner side of a plate 20 of a predetermined thickness; And On a pair of yoke 32 and the yoke 32 that are symmetrically fitted to the hollow shaft 12 to enable linear driving and rotation about the hollow shaft 12 based on the magnetic force of the coil 11. It is coupled to each of the magnetic force, the fitting unit is coupled to both ends of the hollow shaft 12, the starting unit 30 consisting of a starting magnet 31 facing each other with different polarities with respect to the coil 11; Actuator stage device using a moving magnet type VCM. The method of claim 1, The actuating induction unit 10 is a precision actuator stage device using a magnetic magnet type VCM, characterized in that the three are arranged on the plate 20 to take a triangular sphere at an angle of 60 °. The method of claim 1, The starting magnet 31 is a precision actuator stage device using a starting magnet type VCM, characterized in that the permanent magnet that can be generated and maintained without a stable supply of electrical energy from the outside. The method of claim 1, The starting magnet 31 is a precision actuator stage device using a starting magnet type VCM, characterized in that the pair is provided with each pair in the yoke (32) symmetrical about the coil (11).