JPH05328699A - Linear motor - Google Patents

Abstract

PURPOSE:To obtain a predetermined position signal of a movable element block when a conducting member mounted on the block touches a position detecting contact piece by previously electrically connecting the piece to a signal circuit, and arranging a position detecting member at a predetermined Position. CONSTITUTION:A linear motor comprises a stator block, a movable element block 7, a position detecting member 14 and a conducting Member 18 as main component members. The member 14 has a signal board 15, a contact piece holder 16, and two position detecting contact pieces 17, 17. The holder 16 is so arranged fixedly in 8 stator case 2 that the pieces 17, 17 are located at desired positions, thereby bringing outer contact parts 17b, 17b into contact with conducting parts 15a, 15b under predetermined pressure. When the block 7 approaches an end and a conducting piece 18b of the member 18 is brought into contact with both contact parts 17c, 17c of the pieces 17, 17, a signal circuit is operated to sense the block 7 to obtain a predetermined position signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motor used for carrying curtains and the like.

[0002]

2. Description of the Related Art In recent years, long linear motors have been used to convey curtains and the like. As a linear motor of this type, there is a linear motor that is composed of a stator block that is provided with a permanent magnet and a power supply board in a stator case that extends long in a tubular shape, and a mover block that is movably supported by the stator block.

When such a linear motor is used to open and close the curtain, for example, when the curtain reaches a predetermined position by detecting that the curtain has moved near the end and turning off the lighting equipment, It is desired to emit a signal. In response to such a request, generally, as shown in FIG. 12, the stator case of the stator block is
Attach a limit switch B, which is inserted and connected to a signal circuit (not shown) at an appropriate position on A, and the carrier support C of the mover block pushes its lever Ba to limit switch B.
Is designed to operate in reverse. D is a cap put on the end of the stator case A.

[0004]

In the above-described linear motor, the limit switch is externally attached to obtain the predetermined position signal of the curtain, that is, the mover block, and therefore the space for the limit switch and its wiring is provided. It becomes necessary, and installation and wiring work become troublesome,
Furthermore, it is not preferable in terms of appearance.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a linear motor capable of obtaining a predetermined position signal of a mover block without externally attaching a limit switch. To provide.

[0006]

In order to solve such a problem, a linear motor according to the present invention is provided with a stator case which extends in a cylindrical shape and has a roller guide in its lower portion, and a stator case which alternates in the longitudinal direction of the stator case. A plurality of permanent magnets disposed on the stator case so that different poles are present, and a power supply board disposed on the stator case with conductive portions of positive and negative voltages provided so as to sandwich a vertically meandering insulating portion. Of the stator block, a movable table having a coil wound around it and having a yoke facing the permanent magnet, and a brush for slidingly contacting the conductive portion of the power supply board to supply power to the coil, and substantially integrated with the movable table. And a stator block having a roller that is rotatably guided by a roller guide.
A position detecting member having a position detecting contact piece is provided,
A conducting member having a conducting piece for conducting the two position detecting contact pieces is attached to the movable table.

[0007]

According to this structure, if the position detecting contact piece is electrically connected to the signal circuit in advance, the position detecting member is arranged at a predetermined position, so that the conducting member attached to the mover block. When the position detecting contact piece is brought into conduction, a predetermined position signal of the mover block is obtained, and it is not necessary to attach a limit switch externally.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The linear motor of the present invention has the stator block 1, the mover block 7, the position detection member 14, and the conduction member 18 as main constituent members.

The stator block 1 is a stator case having a fixed length and a cylindrical shape having upper and lower walls 2a and 2b and both side walls 2c and 2d.
2 and a permanent magnet 3 with different poles alternately present in the longitudinal direction 3
The power supply board 4 having the positive and negative voltage conductive parts 5 and 6 and the position detection member 14 are housed.

The stator case 2 is formed by extrusion molding of aluminum or the like. As shown in FIG. 5, the upper inside is a yoke accommodating portion of the mover block, and the lower inside is a roller accommodating portion of the mover block. A straight opening 2e is formed in the center of the wall 2b, and roller guides 2f, 2f are provided on both sides of the straight opening 2e. Further, the upper wall 2a has an I-shaped support portion 2g on which the permanent magnets 3 are arranged, one side wall 2c has substantially L-shaped support portions 2h and 2h on which the power supply board 4 is arranged, and the other side wall 2d inner surface. The L-shaped support portion 2 on which the signal board 15 constituting the position detection member 14 is arranged
j, 2j. Furthermore, the outer surface of the upper wall 2a has attachment projections 2k, 2k for attaching the power supply member.
The attachment protrusions 2k, 2k are T-shaped and arranged in parallel at a predetermined interval.

The permanent magnet 3 is a support portion 2g of the stator case 2
As shown in FIG. 6, different poles are alternately present in the longitudinal direction at a constant pitch. 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, let 1 pitch consisting of N pole and S pole be L.

As shown in FIG. 7, the power supply board 4 has an insulating part 4a which meanders vertically at a constant interval in the central part on one surface of a long insulating board with which a brush of a mover block, which will be described later, is in sliding contact.
Exist, that is, in a state of being separated by the insulating portion 4a, in other words, the conductive portions 5 and 6 (thickness about 70 μm) of positive and negative voltages are provided above and below so as to sandwich the insulating portion 4a. In this case, the length W1 of both conductive portions 5 and 6 and the length W2 of the insulating portion 4a at the position where the brush slides are set to W1 ≧ L / 3 and W2 ≦ L / 6, and the supporting portion 2h of the stator case 2 is set. Fixed at 2h.

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, a brush 13, and a conducting member 18.

Since the movable table 8 is for three phases, as shown in FIG. 8, there are three movable tables for each electromagnet, and these are rotatably connected. As shown in FIG. 5, each movable table 8 has a PB.
It is formed of a synthetic resin such as T (polybutylene terephthalate), and its main portion 8a is large enough to accommodate the yoke 11 and the coil 12 and is located in the upper housing portion of the stator case 2. A hook 8b is attached to the main part 8a,
Its tip extends to the roller accommodating portion and is coupled to the locking hole of the conveyed object support body 10 for locking the curtain or the like. The carrier support 10 has a substantially rectangular parallelepiped shape, and a roller shaft 9a is provided above the carrier support 10.
And the rollers 9, 9 are rotatably supported by the roller shaft 9a so as to sandwich the conveyed object supporter 10. Also,
A mounting hole 10a for mounting a conveyed product is provided below.
Therefore, the movable table 8 is movable with respect to the stator case 2 by the rollers 9 and 9 being guided by the roller guides 2f and 2f, and the conveyed object support 10 has a part thereof projected from the linear opening 2e. To do. If the mover block is dedicated to linear drive, a single movable table may be provided with a plurality of yokes and coils.

The yoke 11 includes opposing leg pieces 11a, 11a and a connecting piece 11a.
A laminated iron core having a U-shape at b forms a U-shape, and its connecting piece 11b is fitted and fixed to the movable table 8. Therefore, the facing leg pieces 11a, 11a of the yoke 11 face the permanent magnet 3 with a predetermined gap. It is desirable to cover the tips of the opposing pieces 11a, 11a of the yoke 11 with a resin cap 11c having a small frictional 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
The coil 12 and the permanent magnet 3 constitute an electromagnet, and 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 rectangular parallelepiped shape, and a base end portion thereof is 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 board 4, and the other end of the three coils 12 is electrically connected. Connected to each other. The tip of the brush 13 is located at an interval of L / 3 in the longitudinal direction.

Next, the position detecting member 14 which is an essential part of the present invention.
The conduction member 18 will be described. The position detection member 14 is
It comprises the signal board 15, the contact piece holder 16 and the two position detecting contact pieces 17, 17 described above. As shown in FIG. 3, the signal board 15 is provided with two parallel conductive parts 15a and 15b on one surface of a long insulating board 15c. It is fixed to the supports 2j, 2j.

The contact piece holder 16 is formed of an insulating material such as plastic into a generally L shape having a substrate facing portion 16a and a substrate orthogonal portion 16b. The board facing portion 16a and the board orthogonal portion 16b are wider than the signal board 15 and are
a has a predetermined positional relationship with the signal board 15, and is appropriately disposed and fixed to the stator case 2. Two position detection contact pieces 1
7 and 17 are both formed of a conductive spring plate material and have a central base portion 17a and contact portions 17b and 17c extending on both sides thereof, and the contact portions 17b and 17c sandwich the substrate facing surface portion 16a so as to sandwich the end face thereof. The central base portions 17a are fixed to each other in an insulating state. In this case, the outer contact parts 17b, 17b are connected to the conductive parts 15a, 15b.
Corresponding to b, contact piece holder 16 is stator case
When it is mounted and fixed at 2, the conductive parts 15a and 15b come into contact with each other with a required pressure. Further, the inner contact portions 17c, 17c are positioned parallel to each other.

The conducting member 18 has a base portion 18a which is made of a conductive plate material and is parallel to the main portion 8a of the movable table 8 and conducting pieces 18b, 18b formed by bending from both sides thereof. This base portion 18a is a connecting member.
In order to attach to the movable table 8 via 19, the attachment fitting hole 18c and the screw insertion holes 18d and 18d at one end, and the connecting member
Bending pieces 18e, 18e for holding the outer shell of 19 are provided. Further, the conductive pieces 18b, 18b have a length from the base portion 18a that is equal to that of the contact portions 17c,
17c can be polymerized, and the other end side is curved inward. The tip of both contact parts 17c, 17c mentioned above is
It is designed to slightly exceed the extension of the non-curved portion of the conducting piece 18b. The connecting member 19 has a fitting shaft 19c corresponding to the attachment fitting hole 18c, screw holes 19d and 19d corresponding to the screw insertion holes 18d and 18d, and a screw insertion hole 19e for connection with the movable table 8. .. The conductive piece on the side away from the contact portions 17c, 17c may be functionally omitted.

In this way, the contact piece holder 16 is arranged and fixed to the stator case 2 so that the position detecting contact pieces 17, 17 are at the desired positions (usually near the ends as in this embodiment), and The outer contact portions 17b, 17b come into contact with the conductive portions 15a, 15b with a required pressure. Further, for the conduction member 18, the fitting shaft 19c is fitted into the attachment fitting hole 18c, and the screws 20 and 20 are screwed into the screw holes 19d and 19d through the screw insertion holes 18d and 18d to attach the connecting member 19. Then, the connecting member 19 is connected to the movable base 8 by the screws 21, and the conducting member 18 is attached to the movable base 8.

Further, the signal circuit 22 is, as shown in FIG.
For example, DC 5V signal power supply 23, + side output terminal 24, -side output terminal 25, signal load connected between both output terminals 24, 25
(Not shown) etc. Then, between the + terminal and the + side output terminal 24 of the signal power source 22, specifically, the + terminal is connected to the conductive portion 15a of the signal substrate 15, and the + side output terminal 24 is connected to the conductive portion 15b.

This linear motor has two coils (two phases) of the three coils (three phases) 12, 12, 12 of the mover block 7.
A current is constantly passed through the brush 13 to generate a propulsive force in a certain direction by the magnetomotive force generated at that time, thereby moving the mover block 7. In this case, when the mover block 7 approaches the end and the conductive piece 18b of the conductive member 18 contacts both contact portions 17c, 17c of the position detection contact pieces 17, 17, the signal circuit 22 operates and the mover block 7 moves. A predetermined position signal, which means that the arrival at the predetermined position is detected, is obtained.

In this embodiment, the mover block 7
Moves after the conducting piece 18b contacts both contact portions 17c, 17c, and stops in a state of contacting the contact piece holder 16. Therefore, the signal circuit 22 operates while the mover block 7 exists within a predetermined range from the end.

Next, another embodiment of the present invention will be described with reference to FIGS.
It will be explained based on. This is for example when opening and closing two curtains, that is, one stator case 2
The two mover blocks 7 and 7 are attached to each other so that they move in opposite directions, and the mover block 2 with the curtain closed is attached.
The predetermined position signal of is obtained. It should be noted that description of members substantially similar to those of the previous embodiment is omitted, and only different members will be described.

The contact piece holder 26 of this embodiment is formed in a generally T-shape having a substrate facing portion 26a and a substrate orthogonal portion 26b. That is, the substrate facing portion 26a has a length approximately twice that of the previous embodiment. Then, the stator case 2 is fixed at the approximate center in the longitudinal direction.

The two position detecting contact pieces 27 are provided on the board facing portion 26.
One pair is fixed to both end faces of a. On the other hand, the position detecting contact pieces constituting a pair are 27A on the central base 27 as in the previous embodiment.
a and the outer and inner contact portions 27b and 27c, but the other 27B
Has a shape having only the inner contact portion 27c. Also,
When attaching to both end faces of the board facing part 26a,
On the other hand, the vertical direction of 27B is reversed. And the other 27
Lead wire 26 connects between B and 27B.

The conducting members 28, 28 are the same as those in the previous embodiment and have a shape line-symmetrical thereto, and therefore have bases 28a, 28a and conducting pieces 28b, 28b. In order to attach to the movable table 8 via the connecting member 19, the attachment fitting hole 28c and the screw insertion holes 28d, 28d, and the connecting member.
Bending pieces 28e, 28e for holding the outer shell of 19 are provided.

Thus, the contact piece holder 26 is arranged and fixed on the stator case 2 so that the position detecting contact pieces 27, 27 are at the desired positions (in the present embodiment, substantially in the longitudinal direction of the stator case 2). The outer contact parts 27b and 27b are
Contact 15a and 15b with required pressure. Also a conducting member
28, 28 attach the connecting members 19, 19 as in the previous embodiment, and connect the connecting members 19, 19 to the movable bases 8, 8, whereby the conducting members 28, 28 are connected to the movable base 8. Be attached.

Further, the signal circuit 22 is, as shown in FIG.
It is composed of a signal power supply 23, a + side output terminal 24, a − side output terminal 25, a signal load (not shown) connected between both output terminals 24 and 25, and the like. The conductive portion 15 of the signal board 15 is provided between the + terminal and the + output terminal 24 of the signal power source 22, specifically, the + terminal.
The conductive portions 15b are connected to the a and + side output terminals 24, respectively.

This linear motor includes movable element blocks 7, 7
Comes closer to the center, and the conducting pieces 28b, 28b of the conducting members 28, 28 are connected to the contact portions 27c, 27c and 27 of the position detecting contact pieces 27A, 27B, 27A, 27B.
When the c and 27c are contacted, the signal circuit 22 is activated to obtain a predetermined position signal which is a detection that the mover blocks 7 and 7 have reached a predetermined position.

In this embodiment, the mover blocks 7 and 7 move even after the conducting pieces 28b and 28b come into contact with the contact portions 27c and 27c, and stop in the state of coming into contact with the contact piece holder 26. Therefore, the signal circuit 22 operates while the mover blocks 7 and 7 are present within a predetermined range from the center end.

If the position detecting member provided in the stator case has two position detecting contact pieces,
The design of the signal board and the contact piece holder can be changed appropriately. Further, the structure of the conducting member attached to the movable table can be appropriately changed as long as it has a conducting piece for conducting the two position detecting contact pieces.

[0034]

According to the linear motor of the present invention, if the position detecting contact piece is electrically connected to the signal circuit in advance, the position detecting member is arranged at a predetermined position to be attached to the mover block. The predetermined position signal of the mover block is obtained when the contact member for conducting the position detecting contact piece conducts, and it is not necessary to attach a limit switch externally, and it is not necessary to secure an extra space. It is also preferable.

[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 plan view of an essential part thereof.

FIG. 3 is a plan view of the signal board.

FIG. 4 is a circuit diagram of a main part of the signal circuit.

FIG. 5 is an overall front view thereof.

FIG. 6 is a perspective view of the permanent magnet.

FIG. 7 is a plan view of the power supply board.

FIG. 8 is a perspective view of the mover block.

FIG. 9 is an exploded perspective view of essential parts showing another embodiment of the present invention.

FIG. 10 is an exploded perspective view of the position detection contact piece.

FIG. 11 is a main part circuit diagram of the signal circuit.

FIG. 12 is a perspective view of a main part showing a conventional example.

[Explanation of symbols]

 1 Stator block 2 Stator case 3 Permanent magnet 4 Power supply board 5,6 Conductive part of power supply board 7 Mover block 8 Movable base 9 Roller 10 Transported object support 11 Yoke 12 Coil 13 Brush 14 Position detection member 15 Position detection member Signal board 16 Contact piece holder of position detection member 17,17 Position detection contact piece of position detection member 17a Center base of position detection contact piece 17b Outer contact part of position detection contact piece 17c Inner contact of position detection contact piece Part 18 Conducting member 18a Conducting member base 18b Conducting member conducting piece 19 Connecting member 20,21 Screw 22 Signal circuit

 ─────────────────────────────────────────────────── ─── 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 case, which extends in a cylindrical shape and has a roller guide at its lower portion, permanent magnets arranged so that different poles are alternately present in the longitudinal direction of the stator case, and upper and lower parts. A plurality of stator blocks each having a power supply board provided in a stator case with conductive parts of positive and negative voltages sandwiching a meandering insulating part, and a yoke wound with a coil and facing a permanent magnet. And a movable block having a brush for slidingly contacting the conductive portion of the power supply board and supplying power to the coil, and a mover block having a roller substantially integrated with the movable table and movably guided by a roller guide. A linear motor comprising: a position detecting member having two position detecting contact pieces arranged in the stator case; and a conductive piece for electrically connecting the two position detecting contact pieces to the movable table. Conducting part with A linear motor characterized by having attached materials.