JP2745935B2 - 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] A conventional connecting member A is, 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 into 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. A connecting recess for exposing a power supply board is formed at a connection side end face of the stator case, and the connecting member has a step contact surface for contacting an outer surface of the stator case and an outer surface of the power supply board. And a connecting portion symmetrically connected from the base portion in an L-shape with the base piece and the tip piece, formed of synthetic resin, and formed on the inner surface of each tip piece. A conductive plate is provided, and the conductive plate is elastically pressed against both power supply boards by the elastic force of the base and the continuous portion.

[0008]

According to this construction, the conductive plate provided on the inner surface of the distal end side piece of the connecting member which is structurally solid is used without using the conductive spring which is problematic in terms of assembly work and strength. Since the electrical connection is made and the stator blocks on the both sides in the longitudinal direction are connected and supported by the entire connecting member, an assembly work surface and a strength surface can be improved.

[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. 4, 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 a configuration as shown in FIG. 5 in principle, and a constant current is applied to any two (two-phase) coils 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 power supply board 4 exposed at the connection side end face, and the connection member 14 is formed in an L-shape with the base 14a. The part 14b is integrally formed with a synthetic resin having good heat resistance such as PBT.

More specifically, as shown in FIG. 2, the base portion 14a has a planar shape larger than the width of the connecting recesses 2f, 2f, and is a portion outside the connecting recesses 2f, 2f, and It has contact surfaces 14c, 14c that contact the outer surface of the case 2 and a contact surface 14d that is thick with a width that fits into the connection recesses 2f, 2f and that contacts the outer surface of the power supply board 4. Therefore, both contact surfaces 14c and 14d are stepped. The connecting portions 14b, 14b are connected to the proximal end piece 14e.
And the tip side piece 14f to form an L-shape, and the contact surface 14 of the base 14a
It is symmetrically connected from d and 14d. Opposing proximal piece 14
The dimension between the inner surfaces of e and 14e is approximately equal to the width of the power supply board 4,
The dimension between the contact surface 14d and the tip piece 14f is substantially equal to the thickness of the power supply board 4, and the gap between the tip end faces of the tip pieces 14f, 14f is large enough to allow the brush 13 to pass through.

Reference numerals 15 and 15 denote flat conductive plates made of a copper plate, which are fixed to the inner surfaces of the distal end pieces 14f and 14f of the connecting member 14. Therefore, the conductive plates 15 and 15 are connected to the conductive portions 5 and
It is located corresponding to 6. Also, the conductive parts 15, 15 and the contact surface 14
The dimension between d and d is slightly smaller than the thickness of the power supply board 4.

The connecting members 14 having the conductive plates 15 and 15 fixed thereto
In order to connect the two stator cases 2, 2, as shown in FIG. 1, the connecting recesses of the stator case 2 are formed while the conductive portions 15, 15 and the contact surface 14d sandwich one power supply board 4 therebetween. 2f, and then connect the other power supply board 4 with the conductive portions 15, 15 and the contact surface 14
d, and bring both stator cases 2 and 2 into contact. Thereby, the base 14a of the connecting member 14 and the connecting portion 14
The elastic force b is generated, and the conductive plates 15, 15 are pressed against the power supply substrate 4.

When connecting the stator blocks 1 and 1, such a linear motor does not use a conductive spring which is problematic in terms of assembly work and strength, and thus has a structurally strong distal end of a connecting member. The electrical connection can be performed by the conductive plate provided on the inner surface of the side piece, and the stator blocks on both sides in the longitudinal direction can be connected and supported by the entire connecting member.

[0024]

According to the linear motor of the present invention, the conductive motor provided on the inner surface of the tip side piece of the connecting member which is structurally solid does not use a conductive spring which is problematic in terms of assembly work and strength. Electrical connection is performed by the plate, and the stator blocks on both sides in the longitudinal direction are connected and supported by the entire connecting member, so that an assembly work surface and a strength surface can be improved.

[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 perspective view of the connecting member.

FIG. 3 is a sectional view of the same.

FIG. 4 is a partial plan view of the power supply board.

FIG. 5 is an explanatory diagram of the operation principle.

FIG. 6 is an exploded perspective view of a main part showing a conventional example.

FIG. 7 is a perspective view of the main part.

[Explanation of symbols]

 1 Stator block 2 Stator case 2f Stator case coupling recess 3 Permanent magnet 4 Power supply board 5,6 Conductive part of power supply board 7 Mover block 8 Movable platform 9 Roller 10 Carrier 11 Yoke 12 Coil 13 Brush 14 Connecting member 14a Base of connecting member 14b Connecting portion of connecting member 14c Abutting surface of base of connecting member abutting on stator case 14d Abutting surface of base of connecting member abutting on power supply board 14e Connecting of connecting member Base piece 14f End piece of connecting part of connecting member 15 Conductive plate

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Norihito Shiraiwa, Inventor 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. Inside (56) References JP-A-62-279147 (JP, A) Jpn. (JP, U) JP-A 62-137829 (JP, U) JP-A 1-162778 (JP, U) Jiko 53-8959 (JP, Y1)

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 movably guided by a stator case, and a plurality of yokes facing the permanent magnet are arranged in parallel 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. And the connecting member is formed into an L-shape by a base having a step contact surface that abuts an outer surface of the stator case and an outer surface of the power supply board, and a base piece and a tip piece. Symmetrically from the base And a conductive plate is provided on the inner surface of each tip side piece, and the conductive plate is elastically attached to both power supply boards by the elastic force of the base and the continuous portion. A linear motor characterized by being pressed.