JPH118967A - Linear motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a linear motor thin, while enhancing the response of a mover by providing a mover where permanent magnets are interposed on the opposite sides of a stator coil. SOLUTION: When a coil is excited on a stator 10 produced by arranging a plurality of coils at a specified pitch and bonding in stripe with an insulating resin, a linear guide 9 mounted on a mover 3 is moved in the linear direction along a guide rail laid on a machine frame 1 through the action between a permanent magnet 6 fixed to a frame 4 of the mover 3 and a permanent magnet 7 fixed to a frame 5. In this case, the flux from the coil acts on the permanent magnet 6 fixed to the frame 4 on one side of the mover 3 and also acts on the permanent magnet 7 fixed to the frame 5 on the other side of the mover 3, thus moving the mover 3 in the linear direction. Since the permanent magnets 6, 7 of the mover 3 are disposed on the opposite sides of the stator 10, a linear motor can be made thin and the mass of the mover 3 can be reduced, while enhancing the response.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motor used for a driving device of a knitting needle in a knitting machine.

[0002]

2. Description of the Related Art A conventional linear motor is configured as shown in FIG. In the figure, reference numeral 20 denotes a U-shaped support frame, and guide rails 21 are provided on the end surfaces of both legs of the support frame 20. Reference numeral 22 denotes a moving body. The lower surface of the moving body 22 is placed on the guide rail 21 so that the moving body 22 can be moved along the guide rail 21. 2
Reference numeral 3 denotes a mover frame which is attached to the moving body 22 and has a rectangular cross section.
4 and 24 are fixed. The coils 24 are spirally wound, and a plurality of the coils 24 are arranged along the moving direction of the mover frame 23. Reference numeral 25 denotes a track plate which is formed in a belt shape and is arranged in the mover frame 23 along the moving direction of the mover frame 23 and has an end fixed to a fixed portion (not shown).
A permanent magnet 26 is attached to both surfaces of the first member so as to face the coil 24. The plurality of permanent magnets 26 are arranged in the moving direction of the mover frame 23. When the coil 24 of the linear motor configured as described above is excited, the moving body 22 moves along the guide rail 21 integrally with the mover frame 23 to which the coil 24 is attached due to the electromagnetic action with the permanent magnet 26 attached to the track plate 25. Move.

However, in the conventional linear motor, permanent magnets 26 are mounted on both surfaces of the track plate 25, and the coil 24 is mounted on the inner surface of the mover frame 23 in opposition to the permanent magnets 26. . For this reason, the thickness of the linear motor is increased, and it cannot be applied to a device in which many linear motors are arranged side by side, such as a driving device of a knitting machine. In addition, the mass of the entire mover becomes heavy, and the responsiveness of the mover has been reduced. Therefore, an object of the present invention is to reduce the thickness of a linear motor and improve the responsiveness of a mover.

[0004]

In order to solve the above problems, the present invention lays a guide rail on a machine frame in the longitudinal direction of the machine frame, and fixes the guide rail in parallel with the guide rail to the machine frame. A linear motor having a movable element mounted thereon and mounted on the guide rail, the movable element facing the stator via an air gap,
The stator is formed by molding a plurality of spiral coils arranged in a flat plate at a predetermined pitch with an insulating resin, and is fixed to a machine frame, and the mover is provided with gaps on both sides of the stator. And a permanent magnet is provided on a surface of the frame facing the stator.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. FIG. 1 is a plan view of a linear motor showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along line BB of FIG. In the figure, reference numeral 1 denotes a machine frame, and a guide rail 2 is laid in the machine frame 1 along the longitudinal direction of the machine frame 1. Reference numeral 3 denotes a mover of a linear motor, a frame body 4 having concave portions 4a and 5a in an intermediate portion,
5, a plurality of permanent magnets 6, 7 are arranged and mounted at predetermined pitches in the recesses 4a, 5a of the frame bodies 4, 5. The spacers 8 are connected to one side of the frames 4 and 5 and the frames 4 and 5 are connected and fixed to the other side via a linear guide 9 to form the mover 3. The linear guide 9 of the mover 3 is engaged with the guide rail 2 so that the mover 3 can move along the guide rail 2. Numeral 10 denotes a stator, in which a plurality of spirally wound coils 11 are arranged at a predetermined pitch and fixed in a belt shape with an insulating resin 12, and both ends are fixed to a support seat 13 of the machine frame 1. A rod 14 drives the knitting needle. Next, the operation of the linear motor configured as described above will be described. When the coil 11 of the linear motor is excited, the electromagnetic action between the permanent magnet 6 attached to the frame 4 of the mover 3 and the permanent magnet 7 attached to the frame 5 causes
A linear guide 9 provided on the mover 3 moves linearly along the guide rail 2. In this case, the magnetic flux from the coil 11 acts on the permanent magnets 6 of the frame 4 on one side of the mover 3 and also acts on the permanent magnets 7 of the frame 5 on the other side to move the mover 3 in a linear direction. I do. Therefore, since the permanent magnets 6 and 7 of the mover 3 are arranged on both surfaces of the stator 10, the thickness of the linear motor can be reduced, and since the permanent magnet is used for the mover, the mass of the mover is reduced. The responsiveness of the mover can be improved.

[0006]

As described above, the present invention has the following effects. (1) Since the mover having permanent magnets disposed on both sides of the coil with the coil interposed is provided, the thickness of the linear motor can be reduced without impairing the driving force. (2) Since the mover is configured by attaching a permanent magnet to the surface of the frame body facing the coil, the mass can be reduced and the responsiveness of the mover can be improved. (3) Since the mover is supported only on one side of the mover,
The length of the mover in the width direction can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a linear motor showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a side sectional view of a conventional linear motor.

[Explanation of symbols]

1 machine frame, 2 guide rail, 3 mover, 4 frame, 4a recess, 5 frame, 5a recess, 6 permanent magnet, 7 permanent magnet, 8 spacer, 9 linear guide, 10 stator, 11 coil, 12 insulation Resin, 13 support seat, 14 rod

Claims (2)

[Claims] 1. A guide rail (2) is laid on a machine frame (1) in the longitudinal direction of the machine frame (1), and a stator (2) is fixed to the machine frame (1) in parallel with the guide rail (2). 10), a linear motor having a mover (3) mounted on the guide rail (2) and facing the stator (10) with a gap therebetween, wherein the stator (10) has a predetermined pitch. A plurality of spiral coils (11) arranged in a flat plate are molded by an insulating resin (12) and fixed to a machine frame (1), and the mover (3) is fixed to the stator Frames (4) and (5) are arranged on both sides of (10) via a gap, and the frames (4) and (5)
Permanent magnets (6) and (7) on the surface facing the stator (10)
A linear motor comprising: 2. The linear motor according to claim 1, wherein a linear guide (9) is provided on the guide rail side of the mover (3) of the linear motor to engage with the guide rail (2). [0001]