JP3114871B2 - Linear motor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a linear motor used for conveyance.

[Prior art] Recently, research has been conducted on using a linear motor for transport.
As this type of linear motor, a plate-shaped permanent magnet that is magnetized to different poles in the thickness direction and alternately magnetized to different poles at regular intervals in the longitudinal direction is arranged along the longitudinal direction. A stator block and a plurality of electromagnets in which coils are wound in reverse winding around respective side pieces of a substantially U-shaped iron core in which permanent magnets are interposed between both side pieces are arranged in the longitudinal direction of the permanent magnets. There is a so-called movable coil type, which includes a formed mover block, and propulses the mover block by selectively supplying current to the coils of the respective electromagnets. Here, the mover block includes a brush to which a coil for each electromagnet is connected, and is formed by arranging electromagnets on a connecting body made of synthetic resin, and the stator block includes the permanent magnet, The brush is slid in contact with the rectangular stator case in which the permanent magnet is disposed over the entire length of the center of the lower surface of the top plate, and positive and negative voltages are alternately applied to the coil via the brush as the mover block moves. And a power supply substrate on which a conductor portion to be applied is formed.

[Problems to be Solved by the Invention] In the above-described linear motor, the mover block receives the attraction force acting between the iron core and the permanent magnet and the force when the brush and the power supply board slide. There was a problem of tilting. However, this type of conventional linear motor has no structure to prevent the mover block from tilting, so that the iron core and the permanent magnet rub against each other, weakening the propulsive force of the mover block or scraping the permanent magnet. Or other problems.

The present invention has been made in view of the above points, and an object of the present invention is to provide a linear motor capable of preventing the movable block from being tilted.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, both sides of a connecting body in a direction in which a side piece of an iron core and a permanent magnet face each other and one of opposing surfaces of a stator case. A recess is formed on the other side so that the protrusion is formed and the mover block is slidable along the longitudinal direction of the permanent magnet.

[Operation] According to the present invention, since the protrusions and the concave grooves guide the mover block in the longitudinal direction of the permanent magnet by providing the above-described configuration, the mover block does not tilt, and the iron core is provided. The protrusion and the concave groove are fitted in the direction in which the suction force and the repulsion force act between the armature and the side piece, so that the function of preventing vibration caused by the suction force and the repulsion force during traveling of the mover block is provided. high. In addition, since ridges or grooves are formed in the synthetic resin coupling body provided for arranging a plurality of electromagnets, no other members are required as a configuration for guiding the movement of the mover block. Therefore, the number of parts does not increase.

[Embodiment] FIGS. 1 to 4 show an embodiment of the present invention. The linear motor of the present embodiment is of a moving coil type, and has a structure in which a mover block B slides along a stator block A.

As shown in FIGS. 1 and 4, the stator block A has a rectangular groove-shaped stator case 7 in which a guide groove 9 is formed in the center of the bottom plate 7c along the longitudinal direction and functions as a guide rail. A long permanent magnet 1 that is disposed over the entire length of the center of the top plate 7a of the stator case 7 and functions as a stator.
And a power supply board 5 attached to the inner surface of one side plate 7b of the stator case 7 for supplying power to the coil 3 of the mover block B.
It is composed of

The permanent magnet 1 has N poles and S poles at a constant pitch in the longitudinal direction.
The permanent magnet 1 is magnetized alternately with the N pole and the S pole also in the thickness direction, and a set of magnet pieces composed of the N pole and the S pole in the longitudinal direction of the permanent magnet 1. The length of the portion is L as shown in FIG.

As shown in FIG. 4, the power supply substrate 5 has an insulating portion 5c meandering vertically at a certain interval in a central portion at a certain interval, and upper and lower portions separated by the insulating portion 5c are used as conductor portions 5a and 5b. ,
Positive and negative voltages are applied to the coil 3 of the mover block B, which will be described later, from the respective conductors 5a and 5b. Here, each conductor 5
The width of the portion protruding toward the center of a, 5b is formed at L / 3, and the width of the insulating portion 5c located between both conductors 5a, 5b is formed at L / 6.

The mover block B includes an iron core 2 formed by laminating a substantially U-shaped yoke, a coil 3 wound around the iron core 2,
One end of the coil 3 is connected to the power supply board 5 and the brush 4 is slidably contacted with the power supply board 5. The other ends of the coils 3 are commonly connected.
Here, the length of each electromagnet 8 along the longitudinal direction of the stator case 7 does not exceed L / 3. In other words, iron core 2
When the length of the stator block A along the longitudinal direction is l ₁ as shown in FIG. 3, l ₁ <L / 3, and the coil 3
, The length of the electromagnet 8 is not to exceed L / 3. The distance between the brushes 4 provided for each electromagnet 8 and attached to the mover block B by the insulating plate 20 is set to L / 3.
Touch the center position of

The mover block B is, for example, provided on the connecting body 10 made of a synthetic resin for connecting a conveyed object such as a decorative article.
8a to 8c are arranged side by side and fixed integrally. The movable piece B is housed in the stator case 7 by protruding the connecting piece 10a protruding from the connecting body 10 from the guide groove 9. .
Rollers 11 for smooth movement of the mover block B are provided on both sides of the connector 10. Also, connecting piece
The hole 16 formed in 10a is for connecting a transferred object.

Further, as shown in FIG. 1, a specific structure of the stator case 7 is a structure in which a pair of long and short partitions 7d and 7e protruding from the inner surface of both side plates 7b are divided into upper and lower storage chambers. The upper part of the permanent magnet 1, the iron core 2, the coil 3, the brush 4, the power supply board 5 and the connector 10 is housed in the upper storage chamber, and the connector
The lower part of 10 and the roller 11 are structured to be stored in the lower storage room.

In this linear motor, by adopting the above-described structure, a current always flows from the power supply board 5 to any two of the three-phase coils 3a to 3c, and a propulsive force in a certain direction is obtained by the magnetomotive force generated at this time. The mover block B advances. In addition,
When moving the mover block B in the reverse direction, the positive and negative voltages of the conductors 5a and 5b of the power supply board 5 may be reversed.

By the way, in the linear motor of this embodiment, as shown in FIG. 1, a ridge 7g and a fixing piece are provided on the base above the partition walls 7d and 7e of the stator case 7 along the entire length of the stator case 7 in the longitudinal direction. 7h is formed, and a concave groove 7f is formed between the partition walls 7d and 7e, the ridge 7g and the fixing piece 7h. Also, on the surface of the connecting body 10 facing the concave groove 7f, a ridge 10b is provided so as to slidably fit in the concave groove 7f, thereby forming an uneven fitting portion. When the ridge 10b and the concave groove 7f which are slidably fitted in this way are formed in the connecting body 10 and the stator case 7, the mover block B can be guided along the moving direction. Of the movable block B can be prevented from tilting, so that the iron core 2 and the permanent magnet 1 rub against each other, and the propulsive force of the movable block B is reduced. And the problems such as weakening of the permanent magnet 1 and scraping of the permanent magnet 1 do not occur. Note that, specifically, the left groove 7f on the left side in FIG.
7g is formed so as to protrude, and the right groove 7f is formed by protruding a fixing piece 7h for fixing the lower side of the power supply substrate 5 in parallel with the partition wall 7d, but is limited to such a structure. However, for example, the connector 10 side may be a concave portion, and the stator case 7 side may be a projection. In short, the opposing surface of the connector 10 and the stator case 7 is formed along the moving direction of the mover block B. It is only necessary to form a slidable concave / convex fitting portion by sliding.

[Effects of the Invention] As described above, the present invention forms a ridge on one of opposing surfaces of a stator case and both sides of a connector in a direction in which a side piece of an iron core and a permanent magnet oppose each other, and a mover. Since the groove is formed on the other side of the permanent magnet so that the block is slidable along the longitudinal direction of the permanent magnet, the movable block is moved in the longitudinal direction of the permanent magnet by the rib and the groove. To prevent the mover block from moving in the width direction and the thickness direction of the permanent magnet, and prevent the mover block from tilting. Therefore, the iron core and the permanent magnet rub against each other. As a result, problems such as weakening of the propulsive force of the mover block and scraping of the permanent magnet do not occur. In particular, since the ridge and the groove are fitted in the direction in which the suction force and the repulsion force act between the iron core and the side pieces, vibrations caused by the suction force and the repulsion force during traveling of the mover block are prevented. There is an advantage that the ability to perform In addition, since ridges or grooves are formed in the synthetic resin coupling body provided for arranging a plurality of electromagnets, no other members are required as a configuration for guiding the movement of the mover block. This has the advantage that the number of parts does not increase.

[Brief description of the drawings]

1 is a front view of one embodiment of the present invention, FIG. 2 is a front view of a main part of the stator case, FIG. 3 is a perspective view of a mover block, and FIG. 4 is a schematic structure of a linear motor. It is the perspective view which fractured and showed a part. A is a stator block, B is a mover block, 1 is a permanent magnet, 2 is an iron core, 3 is a coil, 4 is a brush, 5 is a power supply board, 7 is a stator case, 7f is a groove, 10 is a coupling body, 10b is a ridge.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Jun Saito, Kazuma, Kazuma, Osaka 1048, Matsushita Electric Works, Ltd. (56) References JP-A-54-131708 (JP, A) JP-A-1-286764 (JP, A) JP-A-2-49376 (JP, U) JP-A-59-159182 (JP, U) 60-119891 (JP, U)

Claims (1)

(57) [Claims] 1. A plate-shaped permanent magnet which is magnetized to have different polarities in the thickness direction and is alternately magnetized to have different polarities at regular intervals in the longitudinal direction is disposed in a cylindrical stator case along the longitudinal direction. A stator block and an electromagnet in which coils are wound around each side piece of a substantially U-shaped iron core in which a permanent magnet is interposed between the two pieces are wound on a single synthetic resin connecting body. A mover block formed by arranging a plurality of permanent magnets in the longitudinal direction, a brush connected to a coil of each electromagnet is provided on the mover block, and the brush slides and moves the mover block. A power supply board on which a conductor for applying positive and negative voltages alternately to the coil is formed via the brush is provided on the stator block, and the connection in the direction in which the side piece of the iron core and the permanent magnet face each other. Both sides of body and stator casing A protrusion is formed on one of the opposing surfaces, and a groove in which the protrusion is fitted is formed on the other such that the mover block is slidable along the longitudinal direction of the permanent magnet. Linear motor.