JPH0421350A - Linear motor - Google Patents

Abstract

PURPOSE:To prevent the tilting of a needle block so as to prevent the weakening of the driving force of a needle block and wearing of a permanent magnet by respectively forming a slidable recessing and projecting sections which ca be engaged with each other along the longitudinal direction of the permanent magnet on the facing surfaces of a coupling body and stator case. CONSTITUTION:Recessed grooves 7f are respectively formed along the full length of a stator case along the longitudinal direction of the case 7 on the base section above the partitions 7d and 7e of the case 7 and, at the same time, projecting lines 10b which can be put in the grooves 7f in a slidable state are provided on the surface of a coupling body 10 facing the grooves 7f. Because of the grooves 7f and lines 10b, a needle block B can be guided in its sliding direction and the deviation of the block B in the lateral and vertical directions can be controlled. In addition, tilting of the block B can be inhibited. Therefore, such problems as weakening of the needle block B driving force and wearing of the permanent magnet 1 due to mutual rubbing of a core 2 and permanent magnet 1 against each other can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a linear motor used for conveyance.

[Prior Art] Recently, the use of linear motors for conveyance has been researched and developed, and this type of linear motor is magnetized with different polarities in the thickness direction and alternately magnetized with different polarities at regular intervals in the longitudinal direction. A stator block has magnetized flat permanent magnets arranged along the longitudinal direction, and a coil is wound in reverse around each side of a roughly U-shaped iron core with permanent magnets interposed between both sides. The so-called moving coil type is composed of a mover block formed by arranging a plurality of wound electromagnets in a row in the longitudinal direction of a permanent magnet, and propels the mover block by selectively passing current through the fill of each electromagnet. There is something like that. Here, the mover block includes a brush to which a fill for each electromagnet is connected, and the electromagnets are arranged in a row on a synthetic resin connecting body, and the stator block includes the permanent magnet and This permanent magnet is placed in sliding contact with the rectangular cylindrical stator case arranged over the entire length of the center of the lower surface of the top plate, and as the movable block moves, positive and negative voltages are alternately applied to the coil through this brush. It consists of a power supply board on which a conductor section for applying voltage is formed.

[Problems to be Solved by the Invention] By the way, in the linear motor described above, the movable block receives the attractive force acting between the iron core and the permanent magnet and the force generated when the brush and the power supply board come into sliding contact. There was a problem with it leaning. However, this type of conventional linear motor does not have any structure to prevent the mover block from tilting, so the iron core and permanent magnets rub against each other, weakening the propulsive force of the mover block, or causing permanent There were problems such as magnets being scratched.

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 that can prevent the movable block from tilting.

[Means for Solving Problem 31] In order to achieve the above object, the present invention forms a concave-convex fitting portion that is slidable along the longitudinal direction of the permanent magnet on the facing surface of the connecting body and the stator case. It is.

1 Effect] By providing the above-described configuration, the present invention guides the mover block in the longitudinal direction of the permanent magnet at the concave-convex fitting portion, thereby preventing the mover block from being tilted.

[Example 1 An embodiment of the present invention is shown in FIGS. 1 to 4.

The linear motor of this embodiment is of a moving coil type, and has a structure in which a movable block B slides along a stator block A.

The stator block A, as shown in FIGS. 1 and 4,
An idle groove 9 is bored in the center of the bottom plate 7C along the longitudinal direction and serves as an idle rail. a rectangular cylindrical stator case 7, which functions as a stator;

The power supply board 5 is attached to the inner surface of one side plate 7b of the child case 7 and supplies power to the coil 3 of the movable element 7B.

The permanent magnet 1 is magnetized alternately with N poles and S poles at a constant pitch in the longitudinal direction, and also with N poles in the thickness direction.
The permanent magnet 1 is magnetized into poles and south poles, and the length of a pair of magnet pieces consisting of the north and south poles in the longitudinal direction of the permanent magnet 1 is L as shown in Figure 4. be.

As shown in FIG. 4, the power supply board 5 has an insulating part 5c formed in the center that meanders vertically at a right angle at a constant interval, and the upper and lower parts separated by the insulating part 5c are connected to a conductor part 5 at S b
Positive and negative voltages are applied from the respective conductor parts 5g and 5b to the coil 3 of the mover block B, which will be described later. Here, the width of the part protruding toward the center of each of the conductor parts 5m and '5b is formed to be L/3, and the width of the insulating part 5c located behind the side conductors fi5a and Sb is formed to be L/6. It is.

The mover block B includes an iron core 2 formed by laminating abbreviated )-shaped yoke, a coil 3 connected to this iron core 2 by IvN,
It is a three-phase system in which three electromagnets 8 each consisting of a brush 4 connected to one end of the filter 3 and in sliding contact with the power supply board 5 are arranged in three rows. Note that 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 is set not to exceed L/3. In other words, the length of the iron core 2 along the longitudinal direction of the stator block A is as shown in Fig. 3! , then J<L/3, and the length of the electromagnet 8 when the coil 3 is wound is also the above L/3.
Make sure not to exceed. The brushes 4 provided for each electromagnet 8 and attached to the mover block B by an insulating plate 20 have an interval of L/3, and these brushes 4 contact the center of the power supply board 4.

The mover block B has the above-mentioned electromagnets 8i to 8c arranged in a row and fixed integrally on a synthetic resin connecting body 10 that connects conveyed objects such as ornaments. The movable block B is housed in the stator case 7 with the protruding connecting piece 10a protruding from the idle groove 9. Note that mover blocks B are provided on both sides of the connecting body 10.
Rollers 11 are provided to make the movement smooth.

Further, the holes 16 formed in the connecting piece 10a are for connecting all the objects to be transported.

The specific structure of the stator case 7 is, as shown in Figure 1, divided into upper and lower storage chambers by a pair of long and short partition walls 7d and 7e protruding from the inner surface of both side plates 7b. It has 1 permanent magnet, 2 iron cores, 3 coils, 4 brushes.
The structure is such that the upper part of the power supply board 5 and the connecting body 10 are stored in the upper weir storage chamber, and the lower part of the connecting body 10 and the roller 11 are stored in the trade-in storage chamber.

In this linear motor, with the above-described structure, a current is constantly passed from the power supply board 5 to any two phases of the three-phase coils 3 & ~ 3C, and the magnetomotive force generated at this time obtains a propulsive force in a fixed direction. The mover block B moves forward. In addition, when moving the movable block B in the opposite direction, the conductor portion 5a of the power supply board 5.

The polarity of the voltage of 5b may be reversed.

By the way, in the linear motor of this embodiment, as shown in FIG. 1, the distance Ml! A concave groove 7 is formed along the entire length of the stator case 7 in the longitudinal direction at the upper base of 7d and 7e.
f respectively, and the above-mentioned [! Projection 1 that slidably fits into Inl7f
0b is provided protrudingly. The protrusions 10b and grooves 7f, which are slidably fitted in this way, are connected to the connecting body 10 and the stator case 7.
When formed, the movable block B can be guided along the moving direction, the movement of the movable block B in the left-right direction and the vertical direction can be restricted, and the movable block B can be prevented from tilting. Therefore, problems such as the iron core 2 and the permanent magnet 51 rubbing against each other, which weakens the propulsive force of the mover block B, and the permanent magnet 1 being scraped, do not occur. Specifically, the groove 7f on the left side in FIG. Although the piece 7h is formed by protruding parallel to the partition wall 7d, the structure is not limited to this. For example, the connecting body 101I may be a circular part and the stator case 71II may be a protruding part. What is necessary is to form a concavo-convex fitting portion that is slidable along the moving direction of the movable block B on the facing surfaces of the connecting body 10 and the stator case 7.

[Effects of the Invention 1] As described above, the present invention has a concave-convex fitting portion that is slidable along the longitudinal direction of the permanent magnet on the facing surfaces of the connecting body and the stator case, so that the concave-convex fitting portion is formed on the facing surface of the connecting body and the stator case. By guiding the mover block in the longitudinal direction of the permanent magnet at the section, it is possible to restrict the wobbling of the permanent magnet of the mover block in the width direction and thickness direction, and it is possible to prevent the mover block from tilting. Therefore, problems such as the iron core and the permanent magnet rubbing against each other, which weakens the propulsive force of the mover block, and the permanent magnet being scraped, do not occur.

[Brief explanation of the drawing]

Fig. 1 is a front view of one embodiment of the present invention, and Fig. 2 is a stator case of the same as above. FIG. 3 is a perspective view of the mover block, and FIG. 4 is a partially cutaway perspective view showing the schematic structure of the linear motor. 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 connecting body, 10
b is a protrusion. Agent Patent Attorney Ishi 1) Ai Voluntary action to write 7 amendments June 29, 1990'; 3. Relationship with the case of the person making the amendment Patent application address 1048 Kadoma, Kadoma City, Osaka Prefecture Name (58
3) Matsushita Electric Works Co., Ltd. Representative: Toshio Miyoshi 4, Agent postal code: 530 Address: IT 12-17-5, Umeda, Kita-ku, Osaka City, Date of amendment order: 6, Number of claims increased by amendment: None 7 , Subject of amendment Specification

Claims (1)

[Claims] (1) Fixed plate-shaped permanent magnets, which are magnetized with different polarities in the thickness direction and alternately magnetized with different polarities at regular intervals in the longitudinal direction, are arranged along the longitudinal direction in a cylindrical stator case. An electromagnet with a coil wound in reverse around each side of a substantially U-shaped iron core with a child block and a permanent magnet interposed between both sides, is placed on a synthetic resin connecting body along the length of the permanent magnet. A brush is provided on the mover block to which a coil for each of the electromagnets is connected. In a linear motor in which a stator block is provided with a power supply board on which conductor parts are formed that apply positive and negative voltages alternately to the coils via brushes, a permanent magnet is attached in the longitudinal direction on the facing surface of the above-mentioned coupling body and the stator case. What is claimed is: 1. A linear motor comprising a concave-convex fitting portion that is slidable along the concave-convex fitting portion.