KR20030020787A - A Fine Actuator Stage Using Moving Magnet Type Of VCM - Google Patents

Abstract

PURPOSE: A precise actuator stage device is provided to achieve improved accuracy of drive operation and reduce errors caused due to heat, while reducing the weight and volume of the voice coil motor actuator. CONSTITUTION: A precise actuator stage device(100) comprises a start induction unit(10) including a hollow shaft(12) and a coil(11) having a central portion where the hollow shaft is disposed, wherein the start induction unit is fixed at the penetrating portion of the interior of a plate(20) having a predetermined thickness in such a manner that both sides of the start induction unit are exposed; and a starting unit(30) including a pair of yokes and starting magnets. The pair of yokes are arranged to be symmetrical to the hollow shaft in such a manner that the yokes rotate or move in a linear way centering from the hollow shaft by the magnetic force of the coil. The starting magnets are coupled to the yokes, respectively, through the magnetic force and opposed to the coil in different polarities.

Description

A Fine Actuator Stage Using Moving Magnet Type Of VCM}

The present invention relates to a stage device for an actuator. More specifically, the actuator is disposed in a triangular sphere on a plate so as to overcome the existing multi-layered structure, and by replacing the starting magnet with a coil to which a current is applied, a change in relative magnetic force The magnetic levitation of the starting magnet 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 be realized precisely and quickly.

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 precision actuator stage device using a moving magnet type VCM capable of linear driving and rotation about a point. .

A second object of the present invention is to provide a precise actuator stage device using a starting magnet type VCM capable of linearly driving and rotating 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. To a magnetic force coupled to the coil 11 facing each other with different polarities, the starting unit 30 consisting of a starting magnet 31; and a precision actuator stage device using a starting magnet type VCM, characterized in that Is achieved.

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 based on Lorentz's law, and a coil 11 and a general magnetic force that generate magnetic force when a current is applied. It is to apply the principle of magnetic levitation by the electromagnetic induction which allows the driving magnet 31 to be linearly driven or rotated according to the magnetic field between the movable magnets 31 having the characteristics of permanent magnets.

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) and a pair of yokes 32 and yokes 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 and the yoke. And a starting unit 30 composed of two pairs of starting magnets 31 facing each other with different polarities to the coil 11 to which a current is applied to the coil 11.

Here, the start-up induction unit 10 is fixed to the plate 20, the coil 11 to function as an electromagnet by forming a lump with a wire wound several times to express a magnetic force with the applied current, and the coil 11 It consists of a hollow shaft 12 fixed to the center of the.

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 a relative flux flow of the coil 11 and the starting magnet 31 This is to ensure a smooth connection.

In addition, a pair of the magnets 31 are attached to each yoke 32 so as to be symmetric about the hollow shaft 12, and a total of two pairs are provided, one pair each with the coil 11 interposed therebetween. Is driven by a magnetic force relative to the coil 11 is applied.

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. And, it can be linearly driven in the horizontal direction (X, Y axis direction) with a predetermined distance between the hollow shaft 12 as the drive distance.

In addition, the starting magnet 31 may be rotated by a desired rotation angle θ about the hollow shaft 12 and the Z axis by controlling the polarity and the magnitude of the current applied to the coil 11. have.

This is due to Lorentz's law that a magnetic field is generated in a direction in which an induced current interferes with the change of magnetic flux, and a mutual pushing force is generated by the magnetic force of the starting magnet 31 with respect to the coil 11. As a result, the maneuver magnet 31 and the yoke 32 are supported according to Newton's third law of action-reaction.

At this time, since the air between the coil 11 and the starting magnet 31 acts as a bearing for smooth driving of the starting magnet 31, any air that interferes with driving except for minute friction caused by air. No other disturbances occur.

Accordingly, the starting magnet 31 and the yoke 32 are magnetically floated with respect to the coil 11 facing each other, and the yoke 32 is fixed by the hollow shaft 12, but the starting magnet 31 is fixed. Since there is a predetermined interval with respect to the hollow shaft 12 can be smoothly driven or rotated about the hollow shaft 12 by the interval.

On the other hand, the maneuvering induction unit 10 is arranged in the plate 20 so that a total of three take the equilateral triangle composition at an angle of 60 ° to each other to form an overall symmetry.

Accordingly, the maneuvering unit 30 connected to the maneuvering unit 10 also takes the composition of an equilateral triangle having a mutual angle of 60 ° to achieve symmetry, thereby enabling precise driving.

In the precision actuator stage device 100 using the moving magnet type VCM according to the present invention as described above, the starting guide unit 10, in addition to the form of taking the equilateral triangle with a total of three in the plate 20, the number By differently, the two may be symmetrically in pairs, the four may take the shape of a square, and the five may take the shape of an octagon, and the arrangement may be arbitrarily used as needed.

According to the precise actuator stage device using the moving magnet type VCM according to the present invention as described above, unlike the conventional actuator type in which the coil 11 is driven to change the point of action of the force, the magnet is started, so the point of action of the force The fixed and more precise driving is possible, and the error caused by 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 magnetic force of the starting magnet is possible due to the relative magnetic force of the starting magnet with respect to the coil functioning as an electromagnet, so that the linear driving and the direct rotation can be performed smoothly about the hollow shaft.

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. Precise actuator stage device using a starting magnet type VCM, characterized in that consisting of; a starting unit (30) consisting of a starting magnet (31) facing each other with different polarities with respect to the coil (11) coupled to a magnetic force. 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).