JP2000004574A - Linear motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear motor with its strength ensured, in the structure of a linear motor, by forming thickness in the layering direction so as to be smaller. SOLUTION: Linear motors 19a, 19b which are layered and adjacent to each other involve a corresponding mover 20a or 20b respectively, and have stators 21a, 21b or 21c, 21d. The stator iron core 21b' of the stator 21b and the stator iron core 21c' of the stator 21c are integrally formed, and are used each other by the linear motors 19a, 19b, thus it is possible to eliminate a motor frame, thereby attaining a linear motor thinner in the laminating direction of the linear motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motor used for driving a heald frame of a loom or the like.

[0002]

2. Description of the Related Art Conventionally, a plurality of heald frames (heald frames) into which a large number of warps (warp yarns) are inserted are alternately moved up and down to open a shed, and a weft (weft) is wound around the opening. There is a loom in which a weft is inserted between warps opened by driving a shed, and the inserted weft is beaten to a weaving opening (front end) by a reed to create a fabric.

[0003] In order to drive the heald frame up and down as described above, use of a linear motor has been proposed today. FIG. 6 is a view showing the structure of a linear motor used for the above-mentioned applications. FIG. 2 shows a cross section when two linear motors are stacked.

The reason why two (or two or more) linear motors are stacked and used in this manner is that a large number of heald frames are used and a plurality of heald frames are efficiently driven. is there.

Here, the linear motors have the same configuration. For example, the linear motor 1 is composed of a movable element 2 mounted on the above-mentioned heald frame and a stator 3 for driving the movable element 2. The stator 2 includes a mover frame 2a and a mover magnet 2b built therein, and the stator 3 includes a stator core 3
The coil 3b is wound around a.

The linear motor 4 has exactly the same configuration, and includes a mover 5 mounted on a heald frame (not shown) and a stator 6 for driving the mover 5, and the mover 5 is a mover. The stator 5 is configured by incorporating a coil 6b around a stator core 6a. The linear motors 1 and 4 are covered with motor frames 7 and 8 as housings, and the above-described coil 3b is fixed to the motor frame 7,
The above-mentioned coil 6b is fixed to the motor frame 8.

In the above configuration, the movable element 2 is moved in the direction of arrow A in FIG. 1 by flowing, for example, a three-phase current through the stator core 3a, and is moved by flowing a three-phase current through the stator core 6a. The child 5 is moved in the direction of arrow B.

FIG. 7 shows a linear motor having another configuration. Unlike the configuration of the linear motors 1 and 4, the stator for driving the mover is provided only near the top surface of the mover. That is, the stator 11 is disposed only on the upper surface of the mover 10 of the linear motor 9. Also, the linear motor 12 has a movable member 13 of the linear motor
Are arranged. The configuration itself of the movers 10 and 13 is the same as that shown in FIG. 6, and the mover frames are constructed by incorporating mover magnets, and the configurations of the stators 11 and 14 are also the same. It is configured by winding a coil.

In the above-described configuration, the linear motors 9 and 12 shown in FIG.
The movable element 13 is moved in the direction of arrow D by flowing a three-phase current through the coil of the stator 14. Note that the linear motors 9 and 12 are covered with motor frames 15 and 16 as a casing, similarly to the linear motor of FIG.

[0010]

The following problems occur in the linear motor having the above-described structure. First, in the structure of the linear motor described with reference to FIGS. 6 and 7, by stacking a plurality of linear motors, a large size and a large space are required. That is, since a plurality of linear motors are stacked, the thickness becomes large in the stacking direction and a large space is required. Therefore, in the case of the above-described loom, since a large number of linear motors are used in a stacked manner to drive a large number of heald frames, the driving device has a structure that is thick in the stacking direction of the linear motors, and the loom itself becomes large.

In the linear motor having the structure shown in FIG. 7, the number of stators for driving each of the linear motors 9 and 12 is one, which can be narrowed in the laminating direction of the linear motors. Becomes smaller. Accordingly, in view of the drive output of the linear motor having the structure shown in FIG. 6, the structure becomes thick in the laminating direction in order to obtain the same output.

In order to solve the above-mentioned problems, the present invention provides a linear motor which has a structure of a linear motor which is thin in a laminating direction and which has a sufficient strength.

[0013]

According to the first aspect of the present invention, an object is provided near one surface of a first movable element comprising a permanent magnet, and is wound around an iron core. A first linear motor having a first stator formed of a coil, a second stator provided near the opposite surface of the first mover and having an iron core and a coil wound around the iron core; A third stator integrated with an iron core of the second stator and provided near one surface of a second mover made of a permanent magnet; and a third stator provided near an opposite surface of the second mover. , A fourth stator having an iron core and a coil wound around the iron core.
This can be achieved by providing a linear motor comprising:

That is, the first linear motor comprises a first mover made of a permanent magnet, and first and second stators provided near both surfaces of the first mover. Each stator has an iron core and an iron core. The second linear motor is also composed of a second mover composed of a permanent magnet and third and fourth stators provided near both surfaces thereof, each of the stators being an iron core. And a coil wound around the iron core.

In such a configuration, the iron core of one of the stators (the second stator) constituting a part of the first linear motor is connected to the stator (the second stator) constituting the part of the second linear motor. (3) The invention is to be integrated with the iron core of the stator).
With this configuration, the thickness of the first and second linear motors in the stacking direction can be reduced without using a motor frame.

According to the second aspect of the present invention, a permanent magnet and first and second magnets provided on both surfaces of the permanent magnet are provided.
A first linear motor having a first mover including a second frame, a stator provided near one surface of the first mover, and including a core and a coil wound around the core;
A second movable element including a permanent magnet and third and fourth frames provided on both surfaces of the permanent magnet; and a second movable element provided near one surface of the second movable element, the second movable element being close to the second frame. A second core comprising a core provided and a coil wound around the core;
And a second linear motor having the above stator.

According to the present invention, there is provided:
The configuration of each linear motor (first and second linear motors) is different, and a stator winding for driving the mover of each linear motor is formed only on one surface side of the mover to move the mover. Other configurations are basically the same as those in claim 1
It is the same as the invention of the above.

Therefore, a stator (stator core) constituting a part of the second linear motor is provided near one frame of the first mover constituting a part of the first linear motor. This eliminates the motor frame between the first and second linear motors, which has conventionally existed, and makes it possible to reduce the thickness of the first and second linear motors in the stacking direction.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. <First Embodiment> FIG. 2 is a schematic view of a loom using a linear motor for explaining a first embodiment of the present invention.

In the figure, a heald frame (heald frame)
Each of the heald frames 17 is held by a guide (not shown), and is driven up and down along a guide frame 18. The vertical drive is performed by a linear motor 19 disposed between each heald frame 17 and the guide frame 18.

In the operation of the above-described loom, a plurality of heald frames into which a large number of warps (warp yarns) are inserted are alternately moved up and down to open a shed (not shown), and a weft (weft) is inserted into the opening. A weft is inserted between the opened warp yarns by driving the wound shuttle, and the inserted weft yarn is beaten to a weaving opening (front end) by a reed to form a fabric.

The linear motor 19 includes a mover 20 and a stator 2
The movable element 20 is attached to the above-mentioned heald frame (heald frame) 17, and the stator 21 is provided with a guide frame 18. The left and right linear motors 19 have the same laminated structure.

FIG. 3 is a perspective view of the above-described linear motor 19, showing one layer of the linear motors stacked for driving a plurality of heald frames (heald frames) 17. The linear motor 19 of the present embodiment is of a so-called magnet mover type, and the mover 20 has magnets 22 having different magnetic poles (N pole, S pole) alternately.
Are arranged. The above-described magnets 22 provided on the mover 20 are, for example, permanent magnets, and are alternately provided in the up-down direction of the mover 20.

FIG. 4 is a diagram showing only the structure of the mover 20. One surface of the mover 20 facing the stator 21 and the opposite surface are covered with non-magnetic frames 23a and 23b.
Actually, the frames 23a and 23b face the corresponding stator 21. Note that, in FIG.
a and 23b are omitted. The gap between the mover 20 and the stator 21 (the frame 23a or 23b) is small, for example, about 1 mm.

In the above configuration, a coil is wound around an iron core, which will be described later, on the stator 21, and an alternating magnetic field is generated by flowing, for example, a three-phase current through the coil, thereby driving the mover 20 up and down. For example, the mover 20 is driven downward by generating an alternating magnetic field that moves downward in FIG.
The movable element 20 is driven upward by generating an alternating magnetic field that moves upward, and the heald frame (heald frame) 17 attached to the movable element 20 is driven up and down.

FIG. 1 is a sectional view showing a laminated structure of the linear motor of this embodiment. As shown in FIG.
Are arranged in a stack, and in FIG.
a, 19b,...

For example, a linear motor 19a as a first linear motor includes a mover 20a as a first mover made of a permanent magnet and fixed as first and second stators provided near both surfaces thereof. It is composed of children 21a and 21b. As shown in FIG. 4, the non-magnetic frames 23a and 23b are formed on both sides of the mover 20a, and magnets 22 having different magnetic poles are alternately provided inside. Further, the stator 21a includes a stator core 21a 'and a stator core 21a'.
And a stator 21b
Consists of a stator core 21b 'and a coil 21b "wound around the stator core 21b'.

On the other hand, a linear motor 19b as a second linear motor includes a mover 20b as a second mover similarly formed of a permanent magnet, and third and fourth stators provided near both surfaces thereof. As the stators 21c and 21d. Also in this case, the mover 20a has the configuration shown in FIG. 4 described above, and the frame is coated with magnets 22 having different magnetic poles alternately. The stator 21c includes a stator core 21c 'and a coil 21c "wound around the stator core 21c', and the stator 21d includes a stator core 21c '.
coil 21 wound around d ′ and stator core 21db ′
d ".

With this configuration, the iron core 21 of the one stator (second stator) of the linear motor 19a is formed.
b ′ is formed integrally with the iron core 21c ′ of one of the stators (third stator) of the linear motor 19b, and can have a thin structure in the laminating direction of the linear motors 19a and 19b. That is, the stator cores 21b ′ and 21b are integrally formed without using the motor frame conventionally used.
The two linear motors 19a and 19b are laminated by c ′,
The structure can be thin.

Incidentally, the laminated structure of the next linear motor 19c and the above-described linear motor 19b can be similarly constructed and made thin. The linear motors 19a, 19b,... Configured as described above can be individually driven. For example, when driving the linear motor 19a, for example, a three-phase current is applied to the coils 21a "and 21b" to generate an alternating magnetic field to drive the mover 20a up and down, and to drive the linear motor 19b. , Coil 2
A three-phase current flows through 1c ″ and 21d ″, and the mover 20b can be driven up and down. <Second Embodiment> Next, a second embodiment of the present invention will be described.

FIG. 5 is a view showing a structure of a linear motor for explaining a second embodiment of the present invention. It should be noted that also in this example, the mover constituting the linear motor is of the magnet mover type shown in FIG. 4 described above, and the mover is provided with magnets alternately.

FIG. 5 is a sectional view showing a laminated structure of the linear motor of this embodiment. As shown in the figure, a plurality of linear motors 25 are stacked and arranged, and are shown as linear motors 25a, 25b,.

Also in this embodiment, the linear motor 25a as the first linear motor includes a mover 26a and a stator 28a.
As shown in FIG. 4, the mover 26a is composed of the magnet 22 and frames 27a and 27b as first and second frames coated on the magnet 22. Further, the stator 28a includes a stator core 28a 'and a coil 28a "wound around the stator core 28a'. Therefore, unlike the above-described embodiment, in this embodiment, the stator 28a is a surface of the mover 26a. Is arranged only in the vicinity of.

On the other hand, a linear motor 25b as a second linear motor is composed of a mover 26b and a stator 28b, and the mover 26b has the same structure as that of FIG. Further, the stator 28b includes a stator core 28b ′ and a stator core 2b.
The linear motor 25b is also provided with the stator 28b only near one surface of the mover 26b.

In such a configuration, for example, when driving the linear motor 25a, a three-phase current is passed through the coil 28a to generate an alternating magnetic field to drive the mover 25a up and down. In the case of driving, a three-phase current is applied to the coil 28b "to drive the mover 26b up and down.

Therefore, as described above, also in this embodiment, the linear motors 25a, 25b, etc. can be sequentially laminated without using the motor frame conventionally used, and a thin structure can be obtained.

Also, since no motor frame is interposed between the linear motors 25a and 25b,
The stator 28b of (b) can be used as a back yoke (part of a magnetic circuit) of the linear motor 25a, and the leakage magnetic flux can be reduced and the output can be increased.

[0038]

As described above in detail, according to the present invention, since one stator core is shared by two linear motors, it is possible to make the structure thin in the stacking direction of a plurality of linear motors. In addition, the structure of a plurality of stacked linear motors can be reduced in size.

Further, since the thickness of the shared stator core is the same as that of the conventional case where two stator cores are stacked, the strength does not decrease even if the thickness is reduced in the stacking direction.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the structure of a linear motor according to a first embodiment.

FIG. 2 is an overall configuration diagram of a loom using the linear motor of the present example.

FIG. 3 is a perspective view of a linear motor.

FIG. 4 is a perspective view of a mover.

FIG. 5 is a diagram illustrating the structure of a linear motor according to a second embodiment.

FIG. 6 is a diagram illustrating the structure of a conventional linear motor.

FIG. 7 is a diagram illustrating the structure of a conventional linear motor.

[Explanation of symbols]

19, 19a, 19b, 19c Linear motor 20, 20a, 20b Mover 21, 21a, 21b, 21c, 21d Fixed stator 20a, 20b, 23a, 23b Frame 21c ', 21d' Stator core 21c ", 21c" Coil 25, 25a, 25b Linear motor 26, 26a, 26b Mover 28, 28a, 28b Stator 20a, 20b, 23a, 23b, 27a, 27b Frame 21c ', 21d', 28a ', 28b' Stator core 21c ", 21c ", 28a", 28b "coil

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoichi Saito 2-1-1 Toyota-cho, Kariya-shi, Aichi Prefecture Inside Toyota Industries Corporation (72) Inventor Yoshiji Matsumoto 2-1-1 Toyota-cho, Kariya-shi, Aichi Prefecture F-term in Toyota Industries Corporation (reference) 5H641 BB06 BB16 BB19 GG02 GG04 HH03 HH07 HH10 HH12 HH14

Claims (2)

[Claims] 1. A first stator, which is provided near one surface of a first mover made of a permanent magnet and includes an iron core and a coil wound around the iron core, and near an opposite surface of the first mover. A first linear motor having an iron core and a second stator formed of a coil wound around the iron core; and the first linear motor being used as a part of a magnetic circuit of the first linear motor. A third movable member, which is integral with the iron core of the second stator and is provided near one surface of a second movable member made of a permanent magnet,
, And provided near the opposite surface of the second mover,
A second linear motor having an iron core and a fourth stator formed of a coil wound on the iron core. 2. A first mover comprising a permanent magnet and first and second frames provided on both surfaces of the permanent magnet, an iron core provided near one surface of the first mover, and an iron core and the iron core. A first linear motor having a stator formed of a coil wound around a first movable motor; a second movable element including a permanent magnet and third and fourth frames provided on both surfaces of the permanent magnet; A second core, which is provided in the vicinity of one surface of the second mover and is provided close to the second frame; and a second core comprising a coil wound around the core.
A second linear motor having a stator and a linear motor.