JP2000341929A - Linear motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce normal force and blooming that are generated when a linear motor is driven. SOLUTION: This device is constituted of a plurality of coil units 1, 1a, a fixed plate 3 whose lower end is set up on a fixing part 2 with the coil units 1, 1a arranged on both sides, and a back iron 5 that is formed in such a way as to cover the top part of the fixed plate 3 and provided with magnets 4, 4a that are arranged on its inside so as to face the coil units 1, 1a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motor, and more particularly, to driving a linear motor.
The present invention relates to a linear motor capable of reducing generated vertical force and cogging.

[0002]

2. Description of the Related Art As shown in FIGS. 8 and 9, a conventional linear motor generally comprises a magnetic field back iron 50 and a plurality of coil units disposed on an upper surface of the back iron 50. As shown in FIG. A plurality of magnets 54 attached to the armature back iron 53, the stator 52 having a stator 52, the armature back iron 53 and the coil unit 51, which are positioned above the coil unit 51 and are slid and separated by a predetermined distance.
And a mover 55 composed of As shown in FIG. 9, the coil unit 51 is configured by winding a coil 58 around a predetermined number of turns around a core 57 made of a magnetic material.

In the conventional linear motor configured as described above, when a current is applied to the coil 58 of the coil unit 51, a magnetic field is generated from the coil 58 and the magnet mounted on the mover 56 A magnetic field is generated from 54. As a result, a thrust is generated, and the mover 56 moves. Here, in order for the magnetic field generated by the coil unit 51 and the magnet 54 to form a closed circuit, the field and the armature back irons 50 and 53 must be made of a magnetic material. That is, the magnetic field generated from the coil unit 51 and the magnet 54 is generated by the field and the armature back iron 5.
That is, it is possible to form a magnetic field closed circuit via 0,53.

[0004]

However, as described above, if the field and the armature back iron are formed of a magnetic material and are maintained in a state of facing each other, the field and the armature back iron 50, There is a problem that a normal force is generated between them. Since a vertical force is generated between the field and the armature back irons 50 and 53, when the mover 56 moves, the control precision for controlling the vertical force is reduced. If the vertical force is large, another control device for limiting the vertical position of the mover 56 is required. Further, in order to configure the stator 52, a large number of relatively small parts such as the core 57 and the coil 58 should be attached to the field back iron 50. This makes it difficult to assemble the linear motor. There is a problem that becomes a serious job.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described conventional problems and the like, and does not limit a magnetic field closed circuit generated by a coil unit and a magnet.
An object of the present invention is to provide a linear motor configured so that a vertical force generated between a field and an armature back iron does not reach an external linear motion guide (not shown). Still another object of the present invention is to provide a linear motor capable of improving the efficiency of assembling a stator.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a fixing plate in which a plurality of coil units and a lower part thereof are installed on a fixing part, and the coil units are arranged on both sides thereof. And a back iron which is formed so as to cover the fixing plate at the upper part and has a magnet provided inside thereof so as to face the coil unit, thereby constituting a linear motor.

[0007] In order to achieve the above-mentioned object, the present invention provides a coil part, a connecting means electrically connected to the coil part, and molding the coil part with an epoxy resin to be integrated with a fixed part. A linear motor is constituted by a fixed plate formed so as to cover the fixed plate, and a back iron provided with a magnet provided inside the fixed plate so as to face the coil unit.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In the linear motor according to the first embodiment of the present invention, as shown in FIGS. 1 to 3, an “I” shaped fixing plate 3 is installed on a fixing portion 2, On both sides, the coil units 1, 1a are installed vertically. The fixing plate 3 is made of a non-magnetic material such as aluminum. And, the fixing plate 3
It is configured in a “∩” shape, and is configured to be covered with the back iron 5 that is a magnetic material. In the internal measurement of the back iron 5, a large number of magnets 4, 4a are sequentially arranged close to the coil units 1, 1a.

Further, a position detecting circuit (a switching circuit including a Hall element or the like) 6
A position detection magnet 7 is attached to the bottom surface of the back iron 5 so that the position detection circuit 6 detects the position of the back iron 5 as an armature so as to face the position detection circuit 6. I have. In addition, the position detection circuit 6 and the position detection magnet 7 are configured so that current can be applied to the coil units 1 and 1a only in the portion where the armature is located.

As shown in FIG. 2, each of the coil units 1 and 1a includes a core 8, which is a nonmagnetic material, and a coil 9 having a predetermined number of turns wound around the core 8. That is, FIG.
As shown in FIG. 3, the back iron 5 forms a magnetic field circuit with the fixing plate 3 made of a non-magnetic material interposed therebetween at the portion "A".

When a current is applied to the coil 9, a magnetic field is generated in the coil 9 and a thrust is generated between the coil 9 and the magnets 4 and 4a. When a current is applied to the coil 9 and a magnetic field is generated, the magnetic field formed by the coil units 1 and 1a on both sides becomes a magnetic field closed circuit D (see FIG. 3) because the fixed plate 3 is a non-magnetic material. ).
That is, since a vertical force is generated only when a repulsive force / suction force is generated between the back iron 5 and the fixed plate 3, the fixed plate 3 is formed of a non-magnetic material, and the back iron 5 is formed of a magnetic material. Once configured, no repulsion / suction will be generated. Furthermore, if the core 8 is made of a non-magnetic material, no repulsive / attracting force is generated between the core 8 and the back iron 5 that covers the upper surface of the coil unit 1.

As described above, if no repulsion / attractive force is generated between the fixed plate 3 and the core 8 and the back iron 5, the mover (the armature) formed by the back iron 5 and the magnets 4 and 4a. The precision of the movement control of ()) can be controlled with higher precision. Further, by preventing the vertical force from being generated between the fixed plate 3 and the back iron 5, another external device for limiting the vertical position of the mover is not required. By the position detection circuit 6 and the position detection magnet 7, a control device (not shown) supplies a current to only the coil units 1, 1a located inside the back iron 5, which is an armature, to excite the unit.

The linear motor according to the second embodiment of the present invention has a fixed portion 2 as shown in FIGS.
Then, the coil portion 10 is molded with the epoxy resin 11 to form the fixing plate 3. A connecting means 12 is provided on one side of the fixed part 2 so that a current can be applied to the coil part 10. The fixing plate 3 is formed in a “∩” shape as in the first embodiment described above, and is configured to be covered with a back iron 5 made of a magnetic material.

As shown in FIG. 4, a number of magnets 4, 4a are sequentially arranged inside the back iron 5 at a predetermined interval from the coil unit 10. The coil portion 10 is integrally molded with an insulator such as an epoxy resin 11 (having enough strength to support the coil unit vertically).

On the other hand, on the upper surface of the fixed part 2, a position detecting circuit (switching circuit comprising a Hall element or the like) 6 is installed, and the position detecting circuit 6 detects the position of the back iron 5 as an armature. To this end, a position detecting magnet 7 is attached to the bottom surface of the back iron 5 so as to face the position detecting circuit 6.

In the linear motor according to the second embodiment of the present invention, when the current is applied to the coil unit 10 located at the outermost side of the coil unit 10, the connecting means A current is supplied to a number of coil units 10 via 12.

If current is supplied to a large number of coil units 10,
A magnetic field is generated while current is supplied to each of the coil portions 10 formed integrally with the coil portion 10, and a thrust is generated between the coil portion 10 and the magnet 4 by a repulsive force. When a current is applied to the respective coil units 10 to generate a magnetic field, the coil unit 10 does not have a magnetic material that can function as a back iron, and has only the epoxy 11, so the magnetic field is generated by the epoxy resin 11. After passing through, the magnetic field closed circuit D (see FIG. 5) is formed with the back iron 5 to which the magnet 4 is attached. When a closed magnetic field circuit is formed between the back iron 5 and the magnets 4 and 4a and the coil unit 10 facing each other, the normal force does not affect the linear motion guide (not shown). . And the coil section
If the core 8 constituting 10 is made of a non-magnetic material, it becomes possible to reduce cogging.

As described above, the coil section 10 and the back iron
If a vertical force is not generated between the armature and the back iron 5, the movement control precision of the mover (armature) including the back iron 5 and the magnet 4 can be further improved. Also, between the coil portion 10 and the back iron 5,
That is, by preventing a vertical force from being generated between the mover and the stator, another external device for limiting the vertical position of the mover is not required. By the position detection circuit 6 and the position detection magnet 7, a control device (not shown) supplies a current to only the coil unit 10 located inside the back iron 5, which is an armature, to excite it.

Further, the linear motor according to the third embodiment of the present invention has a fixed portion 2 as shown in FIGS.
On one side, an "L" shaped fixing plate 3 is installed, and on one side of the fixing plate 3, a coil unit 1 made of a non-magnetic material such as aluminum is vertically attached. ing. In addition, a back iron 5 formed in a “∩” shape is installed so as to cover the fixing plate 3 at an upper portion, and a number of magnets 4 are provided inside the back iron 5 so as to be close to the coil unit 1. They are arranged sequentially.

On the upper surface of the fixed part 2, a position detecting circuit (switching circuit composed of a hall element or the like) 6 is installed in the same manner as in the above-described embodiments and the like. A position detecting magnet 7 is attached to the bottom surface of the back iron 5 so as to detect the position of the iron 5 so as to face the position detecting circuit 6.

The operation relationship of the linear motor according to the third embodiment of the present invention configured as described above is similar to that of the above-described embodiments and the like, and will not be described in detail.

[0022]

As described above, in the linear motor of the present invention, the coil units are sequentially arranged on the fixed plate which is a non-magnetic material, the stator is formed, and one back iron is formed so as to cover the stator. Since the magnet is attached and a magnet is attached to the back iron to form a mover, there is an advantage that the position control of the mover is performed more precisely.

Also, by forming the coil portion with a nonmagnetic epoxy resin and connecting the coil portions by connecting means to form a stator, there is an advantage that the assembly of the linear motor becomes very simple. In addition, since no vertical force is generated between the epoxy resin and the back iron to which the magnet is attached, there is an advantage that the position of the mover can be controlled more precisely.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a linear motor according to a first embodiment of the present invention.

FIG. 2 is a side view of the linear motor of FIG.

FIG. 3 is a plan sectional view of the linear motor of FIG. 1;

FIG. 4 is a sectional view showing a linear motor according to a second embodiment of the present invention.

FIG. 5 is a plan sectional view of the linear motor of FIG. 4;

FIG. 6 is a sectional view showing a linear motor according to a third embodiment of the present invention.

FIG. 7 is a plan sectional view of the linear motor of FIG. 6;

FIG. 8 is a sectional view showing a conventional one-side linear motor.

FIG. 9 is a perspective view showing a coil unit of the linear motor of FIG. 8;

[Explanation of symbols]

 1,1a: Coil unit, 2: Fixed part, 3: Fixed plate, 4,4a: Magnet, 5: Back iron, 6: Position detection circuit, 7: Position detection magnet, 8: Core, 9: Coil, 10: Coil part, 11: epoxy resin, 12: connecting means.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor De Hyun Kim South Korea, Kyunkid, Uiwan-shi, Nyson-Dong 624, Jaw-Con Apartment 120-402 (72) Inventor Jang Sung Chung South Korea , Seoul, Sumbuk, Donam-Dong, Dongseomun Hanjin Apartment 202-811

Claims (9)

[Claims] 1. A plurality of coil units, a lower part of which is installed on a fixed part, a fixed plate in which the coil units are arranged on both sides thereof, and an upper part which is formed to cover the fixed plate, And a back iron having a magnet installed so as to face the coil unit. 2. The linear motor according to claim 1, wherein a position detecting circuit is provided on one side of the fixing plate. 3. The linear motor according to claim 1, wherein a position detecting magnet is provided on a bottom surface of the back iron so as to face a predetermined position detecting circuit. 4. A coil unit; connecting means electrically connected to the coil unit; a fixing plate formed by molding the coil unit with an epoxy resin so as to be integrally formed with the coil unit; And a back iron having a magnet provided inside thereof so as to face a predetermined coil unit. 5. The linear motor according to claim 4, wherein a position detection circuit is provided on one side of the fixing plate. 6. The linear motor according to claim 4, wherein a position detecting magnet is provided on a bottom surface of the back iron so as to face a predetermined position detecting circuit. 7. A coil unit, a lower part of which is installed on a fixing part, a fixing plate in which the coil unit is arranged on one side of the side, and a fixing plate which is formed so as to cover the fixing plate on an upper part, and is formed inside the fixing unit. And a back iron having a magnet installed to face the coil unit. 8. The linear motor according to claim 7, wherein a position detecting circuit is provided on one side of the fixing plate. 9. The linear motor according to claim 7, wherein a position detecting magnet is provided on a bottom surface of the back iron so as to face a predetermined position detecting circuit.