JPH05236731A - Linear motor - Google Patents

Abstract

PURPOSE:To provide a linear motor, wherein the aspect of assembling work or strength is improved when coupling stator blocks. CONSTITUTION:A coupling recess 2, where a power supply board 4 is exposed, is made at the end face on the coupling side of a stator case 2, and a screw insertion hole 4c is made in the power supply board 4, and the coupling member 14 is composed of a member body 15 made of an insulating material, where an screw insertion hole 15c is made, two pieces of conductive plates 16, which are ones corresponding to each conductive part 5 and 6 of the power supply board 4 and in which screw holes 16c are made, and four pieces of screws 17, and both power supply boards 4 and 4 are caught with the member body 15 and the two pieces of conductive plates 16 and 16 are screwed with screws 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elongated linear motor used for transportation, and more particularly to a linear motor having an improved connecting member for connecting between stator blocks.

[0002]

2. Description of the Related Art In recent years, long linear motors have been used to convey curtains and the like. A linear motor of that type has a stator block in which a permanent magnet and a power supply board are housed and arranged in a stator case that extends long in a tubular shape, but if the overall length becomes considerably long, connect the stator blocks. They are connected via members.

The conventional connecting member A is, as shown in FIG.
Rectangular base Ba and two mounting bases facing each other
Bb, Bb are integrally formed of synthetic resin, and two mounting bases
Conductive springs C and C, which are bent and formed on Bb and Bb, are fixed. This mounting base Bb, Bb is the stator case D and the power supply board.
It has a height approximately equal to the sum of the thicknesses of E, and has a distance between both Bb and Bb that allows the brush of the mover block (not shown) to pass through. Further, the conductive springs C, C have their sliding contact portions close to the base portion Ba so as to come into contact with the power supply board E with a constant pressure. On the other hand, a stator case D extending in a cylindrical shape accommodates and arranges a power supply board E having conductive parts F and G of positive and negative voltages on one side surface thereof, and a connecting member A is attached to the end surface on the coupling side. Stand B
Connection recesses H and H together with the power supply board E so that b and Bb can be inserted.
Is formed.

Therefore, when the stator case D and the connection recesses H of the power supply board E are fitted to the mounting bases Bb and Bb of the connection member A from both sides in the longitudinal direction, as shown in FIG. Both end surfaces of D and the power supply board E are in contact with each other, and each conductive spring C,
C electrically connects both conductive parts F and G, respectively. The positions of the stator case D and the power supply board E are determined by the spring force of the conductive springs C and C, and the brush is placed between the mounting bases Bb and Bb.
That is, it can pass between the conductive springs C, C.

[0005]

In the linear motor described above, when the stator blocks are connected to each other, the spring force of the conductive spring of the connecting member is used, so that the design, manufacture, or assembly of the conductive spring is performed. Attention must be paid to the handling at the time, especially if the conductive spring is deformed, reliable connection cannot be achieved, and there is a problem in terms of assembly work and strength.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a linear motor which is improved in assembly work and strength when connecting stator blocks. is there.

[0007]

In order to solve such a problem, a linear motor according to the present invention has a stator case elongated in a cylindrical shape and permanent magnets having different poles alternately in the longitudinal direction and a positive and negative voltage. , A stator block accommodating and arranging a power supply board provided with a conductive part, and a plurality of yokes arranged in the longitudinal direction to wind a coil around a movable base that is movably guided by the stator case. A linear motor comprising a mover block having brushes that are installed and arranged, and are in sliding contact with a conductive portion of a power supply board to supply power to each coil, and that connects a plurality of stator blocks in a longitudinal direction via a connecting member. Forming a connection recess on the connection side end surface of the stator case where the power supply board is exposed, and forming a plurality of screw insertion holes on the power supply board at positions facing the connection recess and not obstructing brush passage. You Along with the connecting member, a member main body made of an insulating material, which has a U-shape into which the power feeding board is fitted and has a screw insertion hole formed at a position corresponding to the screw insertion hole of the power feeding board, and each conductive portion of the power feeding board. Which is abutted to the power supply board and has at least four screws and two conductive plates having screw holes formed at positions corresponding to the screw insertion holes of the power supply board. It is configured to be sandwiched between conductive plates and screwed.

[0008]

According to this structure, the electrically conductive spring, which has a problem in terms of assembly work and strength, is not used, and the two electrically conductive plates of the structurally solid connecting member are used for electrical connection. At the same time, since the member main body and the two conductive plates securely fix both power supply boards, the step between the power supply boards becomes extremely small.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. This linear motor is a stator block
1 and the mover block 7 and the connecting member 14 are basic constituent members.

The stator block 1 is provided with a stator case 2 elongated in a cylindrical shape, a permanent magnet 3 having different poles alternately in the longitudinal direction thereof, and power supply portions 5 and 6 for positive and negative voltages. The substrate 4 is accommodated and arranged.

The stator case 2 is formed by extrusion molding of aluminum or the like, the upper part thereof is a yoke accommodating part of the mover block, and the lower part thereof is a roller accommodating part of the mover block.
At the center of the lower surface, there is an opening 2a through which the transported object support penetrates, and on both sides thereof are roller guides 2b, 2b. Also,
The upper surface has an I-shaped supporting portion 2c on which the permanent magnet 3 is arranged, and the one side surface has L-shaped supporting portions 2d and 2d on which the power feeding board 4 is arranged.

The permanent magnet 3 is a support portion 2c of the stator case 2.
, And the opposite poles are alternately present at a constant pitch in the longitudinal direction. Since the permanent magnet 3 is magnetized in the direction orthogonal to the longitudinal direction, that is, in the thickness direction, it is in a state viewed from one side with the above-mentioned alternate different poles. now,
One pitch consisting of the N pole and the S pole is L.

The power supply substrate 4 is preferably made of a flexible insulating substrate, and as shown in FIG. 3, there is an insulating portion 4a meandering vertically at regular intervals in the central portion, that is, the insulating portion 4a. Conductive part of positive and negative voltage up and down in the state of being separated by
There are 5 and 6. The brush of the mover block, which will be described later, slides the center of the power supply board 4 in the order of positive conductive portion 5 → insulating portion 4a → negative conductive portion 6 → insulating portion 4a → positive conductive portion 5. The dimensions are such that the positive and negative conductive parts 5 and 6 are L / 3 and the insulating part is L / 6.

The mover block 7 has a movable base 8 in which a roller 9 and a transported object support 10 are substantially integrated, a yoke 11, a coil 12 and a brush 13.

The movable table 8 has a size such that a main part thereof has a plurality of yokes 11 and coils 12 (three in the embodiment) arranged side by side in the longitudinal direction, and is arranged above the stator case 2. A connecting portion 8a located in the storage portion extends from the main portion to the roller storage portion and is coupled to the conveyed object support body 10 that locks the curtain or the like.
A roller shaft 9a penetrates through the conveyed product support 10, and the rollers 9 and 9 are rotatably supported by the roller shaft 9a so as to sandwich the conveyed product support 10. Therefore, the movable base 8 is movably guided by the stator case 2.

The yoke 11 includes opposing pieces 11a, 11a and a connecting piece 11b.
The U-shaped laminated core forms a U-shape, and the facing piece 11
The connecting piece 11b is fitted and fixed to the movable table 8 so that the a and 11a face the permanent magnet 3 with a predetermined gap. Facing piece 11a,
It is desirable to cover the tip portion of 11a with a resin cap 11c having a small friction resistance for the purpose of mechanical protection. The coil 12 is wound around the coil frame 12a mounted on the facing pieces 11a, 11a. Such a yoke 11 and a coil 12
Will form an electromagnet together with the permanent magnet 3.
That is, three electromagnets are arranged side by side in the longitudinal direction. In this case, one of the terminals of the three coils 12 is commonly connected. When the length of the yoke 11 in the longitudinal direction is l1, l1 <L / 3.

The brush 13 has a base end portion provided on an insulating plate 13a provided for each electromagnet so that a tip end portion thereof comes into sliding contact with the power supply substrate 4, and is electrically connected to the other end of the three coils 12. .. The tip of the brush 13 is located at an interval of L / 3 in the longitudinal direction.

This linear motor has a configuration shown in FIG. 4 in principle, and a constant current is constantly applied to any two (two-phase) coils (12, 12) of three (three-phase) via brush 13. The moving element block 7 advances as a result of a flow of force and a magnetomotive force generated at that time to obtain a propulsive force in a fixed direction. When moving the mover block 7 in the opposite direction, the positive / negative relationship of the voltages supplied to the conductive portions 5 and 6 of the power feeding substrate 4 is reversed.

Next, the essential part of the present invention will be described. In the stator case 2 described above, the connecting recesses 2f, 2f having a wider width are formed so that the power feeding board 4 is exposed at the end face on the connecting side, and the power feeding board 4 described above is located at the position facing the connecting recesses 2f, 2f. A plurality of (two in this embodiment) screw insertion holes 4c, 4c are formed at positions where the passage of the brush is not hindered. The connecting member 14 is a member main body 15 made of an insulating material such as synthetic resin,
Two conductive plates 16,16 and at least four screws 17,17,1
It is composed of 7,17.

Specifically, the member main body 15 is a stator case.
The opposing pieces 15a, 15a and the connecting piece 15b, which have substantially the same thickness as 2, are U-shaped. The width between the outer surfaces of the facing pieces 15a, 15a is approximately equal to the width of the connecting recesses 2f, 2f, and the space between the inner surfaces is the power supply board 4
Is approximately equal to the width of the power supply board 4a.
And the thickness of the conductive plate 16 is made substantially equal. Therefore, the power supply board 4 can be fitted between the opposing pieces 15a, 15a. Further, the connecting piece 15b is formed with screw insertion holes 15c, 15c at positions corresponding to the screw insertion holes 4c, 4c of the power supply board 4. The two conductive plates 16 and 16 are relatively thick so as to increase rigidity so as to contact the conductive portions 5 and 6 of the power supply board 4, and are relatively narrow so as not to obstruct the passage of the brush 13. It has a long plate shape,
Screw holes at the positions corresponding to the screw insertion holes 4c, 4c of the power supply board 4.
16c, 16c are formed. The four screws 17,17,17,17 are
The length under the neck is longer than the sum of the thicknesses of the connecting piece 15b of the member main body 15, the power feeding board 4, and the conductive plate 16.

With this connecting member 14, two stator cases 2,
In order to connect the two, as shown in FIG. 1, with both end faces abutted, both power supply boards 4, 4 are sandwiched between the member main body 15 and the two conductive plates 16, 16 and the screw 17 , 17,17,17 are screwed on. As a result, the member main body 15 and the two conductive plates 1
6,16 firmly presses the power supply boards 4,4, so that the two conductive plates 16,16 and the conductive parts 5,6 of the power supply boards 4,4 are in a reliable electrical contact state, and The step between 4 and 4 is also extremely small.

[0022]

EFFECT OF THE INVENTION The linear motor of the present invention does not use a conductive spring, which has a problem in terms of assembly work and strength, but uses two conductive plates of a structurally solid connecting member to electrically perform the operation. Since the connection is performed, the assembly work surface and the strength surface can be improved,
Moreover, since the step between the power supply boards is extremely small, the brush can be slid smoothly.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts showing an embodiment of the present invention.

FIG. 2 is a sectional view thereof.

FIG. 3 is a partial plan view of the power supply board.

FIG. 4 is an explanatory diagram of its operation principle.

FIG. 5 is an exploded perspective view of essential parts showing a conventional example.

FIG. 6 is a perspective view of an essential part thereof.

[Explanation of symbols]

 1 Stator block 2 Stator case 2f Stator case connection recess 3 Permanent magnet 4 Power supply board 4c Power supply board screw insertion hole 5,6 Conductive part of power supply board 7 Mover block 8 Movable stand 9 Roller 10 Transport object support Body 11 Yoke 12 Coil 13 Brush 14 Coupling member 15 Coupling member body 15c Coupling member body screw insertion hole 16 Coupling member conductive plate 16c Coupling member conductive plate screw hole 17 Coupling member screw

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norihi Shiraiwa 1048, Kadoma, Kadoma-shi, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (1)

[Claims] 1. A stator block, which accommodates and arranges a permanent magnet having different poles alternately present in a longitudinal direction in a cylindrically extending stator case, and a power feeding board provided with conductive portions of positive and negative voltages. A coil is wound around a movable base that is movably guided by a stator case, and a plurality of yokes facing the permanent magnet are arranged side by side in the longitudinal direction. In a linear motor that is composed of a mover block having a brush that supplies power to a plurality of stator blocks and that connects a plurality of stator blocks in a longitudinal direction via a connecting member, a connection recess in which a power supply board is exposed at a connection-side end surface of the stator case. And forming a plurality of screw insertion holes at a position facing the connection recess in the power supply board and not obstructing the passage of the brush, the connecting member is formed into a U-shape for fitting the power supply board. With eggplant A member body made of an insulating material, in which a screw insertion hole is formed at a position corresponding to the screw insertion hole of the power supply board,
The power supply board is configured to have two conductive plates that come into contact with the conductive parts of the power supply board and have screw holes at positions corresponding to the screw insertion holes of the power supply board, and at least four screws. A linear motor in which a screw is screwed while being sandwiched between a member main body and two conductive plates.