JP2745936B2 - Linear motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In recent years, long linear motors have been used for conveying curtains and the like. This type of linear motor has a stator block that accommodates and arranges a permanent magnet and a power supply board in a stator case that extends long in a cylindrical shape, but when the overall length is considerably long, the stator blocks are connected. They are connected via members.

[0003] As shown in FIG.
A 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, C, which are bent, are fixed to Bb, Bb, respectively. The mounting bases Bb, Bb are
E has a height substantially equal to the sum of the thicknesses thereof, and has a distance between the two Bb, Bb, through which the brush of the mover block (not shown) can pass. The conductive springs C, C have their sliding contact portions close to the base Ba so as to contact the power supply substrate E with a constant pressure. On the other hand, a cylindrically extending stator case D accommodates and arranges a power supply board E provided with conductive portions F and G of positive and negative voltages on one side thereof, and a connection member A is attached to an end surface on the connection side. Stand B
b, Bb so that insertion recesses H, H
Is formed.

Accordingly, when the connecting recesses H, H of the stator case D and the power supply board E are fitted to the mounting bases Bb, Bb of the connecting member A from both sides in the longitudinal direction, as shown in FIG. D and both ends of the power supply board E are in contact with each other, and the conductive springs C,
C electrically connects between both conductive portions 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 located between the mounting bases Bb and Bb.
That is, it can pass between the conductive springs C, C.

[0005]

In the above-described linear motor, since the connection of the stator blocks depends on the spring force of the conductive spring of the connecting member, the conductive spring is designed, manufactured or assembled. Careful attention must be paid to handling at the time. Particularly, when the conductive spring is deformed, reliable connection cannot be performed, and there has been 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 having an improved assembly work surface and improved strength when connecting stator blocks. is there.

[0007]

SUMMARY OF THE INVENTION In order to solve this problem, a linear motor according to the present invention is provided with a permanent magnet having a different polarity in a longitudinally extending stator case and a positive and negative voltage. A stator block accommodating and disposing a power supply board provided with a conductive portion, and a plurality of yokes facing a permanent magnet arranged in a longitudinal direction by winding a coil around a movable base movably guided by a stator case. A linear motor that includes a mover block having a brush for supplying power to each coil by slidingly contacting the conductive portion of the power supply board, and connecting 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 in the power supply board at a position facing the connection recess and not obstructing the passage of the brush. You The connecting member has a U-shape to which the power supply board is fitted, and 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; And two conductive plates having screw holes formed at positions corresponding to the screw insertion holes of the power supply board, and at least four screws. A screw is screwed in a state sandwiched between conductive plates.

[0008]

According to this structure, the electrical connection is made by the two conductive plates of the connecting member which is structurally secure, without using the conductive spring which has a problem in terms of assembly work and strength. In addition, since the member main body and the two conductive plates securely fix both the power supply boards, the step between the power supply boards is extremely small.

[0009]

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

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

The stator case 2 is formed by extruding aluminum or the like, and the upper part is a yoke accommodating part of the movable element block, and the lower part is a roller accommodating part of the movable element 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 support portion 2c on which a permanent magnet 3 is disposed, and the one side surface has L-shaped support portions 2d, 2d on which a power supply board 4 is disposed.

The permanent magnet 3 is supported by a support 2 c of the stator case 2.
And alternate poles are present alternately at a constant pitch in the longitudinal direction. Since the permanent magnet 3 is magnetized in a direction perpendicular to the longitudinal direction, that is, in the thickness direction, the above-mentioned alternate different poles refer to a state viewed from one side. now,
One pitch consisting of the north pole and the south pole is L.

The power supply substrate 4 is preferably made of a flexible insulating substrate. As shown in FIG. 3, there is an insulating portion 4a meandering up and down at regular intervals in the center, that is, the insulating portion 4a. Conductive part of positive and negative voltage up and down separated by
5,6 are provided. The brush of the mover block, which will be described later, slidably contacts the center of the power supply board 4 with the positive conductive portion 5 → the insulating portion 4a → the negative conductive portion 6 → the insulating portion 4a → the positive conductive portion 5. The dimensions are L / 3 for the positive and negative conductive portions 5 and 6, and L / 6 for the insulating portion.

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

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

The yoke 11 has opposing pieces 11a, 11a and connecting pieces 11b.
The U-shaped laminated core has a U-shape, and the opposing piece 11
The connecting piece 11b is fitted into and fixed to the movable base 8 so that the a and 11a face the permanent magnet 3 with a predetermined gap therebetween. Opposing piece 11a,
It is preferable that a resin cap 11c having a small frictional resistance be put on the tip of 11a for mechanical protection. The coil 12 is wound around a coil frame 12a mounted on the opposing pieces 11a. Such a yoke 11 and a coil 12
Will constitute an electromagnet together with the permanent magnet 3,
The three electromagnets are juxtaposed in the longitudinal direction. In this case, one of the terminals of the three coils 12 is connected in common. Further, when the length of the yoke 11 in the longitudinal direction is l1, l1 <L / 3.

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

This linear motor has the configuration shown in FIG. 4 in principle, and constantly supplies a current to any two (two-phase) of three (three-phase) coils 12, 12, 12 via a brush 13. The mover block 7 advances by obtaining a propulsive force in a certain direction by the magnetomotive force generated at that time. When moving the mover block 7 in the reverse direction, the polarity of the voltage supplied to the conductive portions 5 and 6 of the power supply substrate 4 is reversed.

Next, the main part of the present invention will be described. The above-described stator case 2 has connection recesses 2f, 2f wider than the connection side end surface so that the power supply board 4 is exposed, and the above-described power supply board 4 is located at a position facing the connection 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 includes a member main body 15 made of an insulating material such as a synthetic resin,
Two conductive plates 16,16 and at least four screws 17,17,1
It consists of 7,17.

Specifically, the member main body 15 is a stator case.
The opposing pieces 15a, 15a having substantially the same thickness as 2 and the connecting piece 15b form a U-shape. The width between the outer surfaces of the opposing pieces 15a, 15a is substantially equal to the width of the connection recesses 2f, 2f, and the width between the inner surfaces is the power supply board 4
And the height of both opposing pieces 15a, 15a is
And the thickness of the conductive plate 16. Therefore, the power supply board 4 can be fitted between the opposing pieces 15a. Further, screw insertion holes 15c, 15c are formed in the connection piece 15b 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 to increase rigidity so as to abut on the conductive portions 5 and 6 of the power supply substrate 4 and are relatively narrow so as not to hinder the passage of the brush 13. In the shape of a long plate,
Screw holes at positions corresponding to the screw insertion holes 4c, 4c on 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 connection piece 15b of the member main body 15, the power supply board 4, and the conductive plate 16.

With this connecting member 14, two stator cases 2,
1, two power supply boards 4, 4 are sandwiched between a member main body 15 and two conductive plates 16, 16 with their end faces abutting each other, as shown in FIG. , 17,17,17 are screwed. As a result, the member body 15 and the two conductive plates 1
6 and 16 firmly press the power supply boards 4 and 4 against each other, so that the two conductive plates 16 and 16 and the respective conductive portions 5 and 6 of the power supply boards 4 and 4 are in a reliable electrical contact state. The step between 4 and 4 is also very small.

[0022]

The linear motor according to the present invention does not use a conductive spring which is problematic in terms of assembly work and strength, and uses two conductive plates of a structurally solid connecting member to provide an electric connection. Because the connection is made, the assembly work surface and strength aspect can be improved,
In addition, since the step between the power supply substrates is extremely small, the brush can be slid smoothly.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part 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 the operation principle.

FIG. 5 is an exploded perspective view of a main part showing a conventional example.

FIG. 6 is a perspective view of a main part thereof.

[Explanation of symbols]

 1 Stator block 2 Stator case 2f Stator case coupling recess 3 Permanent magnet 4 Power supply board 4c Screw insertion hole of power supply board 5,6 Conductive part of power supply board 7 Mover block 8 Movable table 9 Roller 10 Conveyance support Body 11 Yoke 12 Coil 13 Brush 14 Connecting member 15 Member body of connecting member 15c Screw insertion hole of member body of connecting member 16 Conductive plate of connecting member 16c Screw hole of conductive plate of connecting member 17 Screw of connecting member

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Norihito Shiraiwa, Inventor 1048 Odakadoma, Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. (56) References JP-A-1-162778 (JP, A) JP-A-4-364353 (JP, A) Fully open 1979-41276 (JP, U) Fully open 1979-36500 (JP, U) Fully open 1987-139080 (JP, U)

Claims (1)

(57) [Claims] A stator block accommodating and disposing a power supply board provided with a permanent magnet and a conductive portion having positive and negative voltages alternately arranged in a longitudinal direction in a stator case elongated in a cylindrical shape; 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. A connecting block in which a power supply board is exposed at a connection side end face of the stator case, comprising a movable block having a brush for supplying power to a plurality of stator blocks in a longitudinal direction via a connecting member. Forming a plurality of screw insertion holes at a position facing the connection recess on the power supply board and not obstructing the passage of the brush, and forming the connection member into a U-shape in which the power supply board is fitted. With eggplant A member body made of an insulating material having a screw insertion hole formed at a position corresponding to the screw insertion hole of the power supply board,
The power supply board includes two conductive plates that are in contact with each conductive portion of the power supply board and have screw holes formed 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 in a state sandwiched between a member main body and two conductive plates.