JPH05316711A - Linear motor - Google Patents

Abstract

PURPOSE:To facilitate electric connection between a feedthrough capacitor and a power supply board and to enhance its reliability. CONSTITUTION:A power supply member 14 is composed of a feed-in plate 16 fixedly supporting a feedthrough capacitor 15, and a terminal strip holder 18 for mounting a terminal strip 17 having a holder part 17b, a spring part 17c, a connector part 17d, and a contact part 17e. When it is mounted at an end of a stator case, the part 17e of the strip is brought into pressure contact with a conductive part of a power supply board by a spring force of the part 17c.

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 conveyance, and more particularly to a linear motor having improved power supply means.

[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 that kind, a stator block having permanent magnets and a power supply board in a stator case elongated in a cylindrical shape, a mover block movably supported by the stator block, and a stator having a feedthrough capacitor are provided. There is a power supply member that is attached to an end of a case and has one end of a feedthrough capacitor connected to a power supply and the other end connected to a conductive portion of a power supply board, which is a power supply member.

As shown in FIG. 9, the power supply member A has a feedthrough capacitor C penetratingly fixed to a conductive plate B having a U-shaped cross section and attached to an end of a stator case D. One end is connected to the power supply via the connector E, and the other end of the feedthrough capacitor C is connected to the conductive part H of the power supply board G via the lead wire F.
Respectively connected to. In this case, both ends of the lead wire F are soldered, and the conductive plate B is in electrical contact with the stator case D made of a conductive material. J is a cap that covers the charged part.

[0004]

In the linear motor having the above-mentioned power supply means, the connection of the lead wire between the feedthrough capacitor and the power supply board is troublesome, and especially the work at the site is particularly troublesome and the reliability is ensured. There is also a problem.

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 in which electrical connection between a feedthrough capacitor and a power supply board can be performed easily and with high reliability.

[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 in each of them, and a power supply board disposed on the stator case by providing conductive portions of positive and negative voltages sandwiching an insulating portion meandering up and down. 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. Attached to the end of the stator case that has a mover block that has a roller that is movably guided by a roller guide and a feedthrough capacitor. One end of the feedthrough capacitor is connected to the power supply and the other end is fed. substrate In a linear motor including a power supply member connected to a conductive portion, the power supply member is provided with a terminal plate that is connected to a feedthrough capacitor at one end and is displaceable in a thickness direction of a power supply board, and is fixed. When the terminal plate is attached to the end of the child case, the terminal plate is pressed against the conductive portion of the power feeding board.

[0007]

According to this structure, when the power supply member is mechanically attached to the end portion of the stator case, the terminal plate is pressed against the conductive portion of the power feeding board to make electrical connection. No need for soldering work.

[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 mainly includes the stator block 1, the mover block 7, and the power supply member 14.

The stator block 1 is a cylindrical stator case having upper and lower walls 2a, 2b and both side walls 2c, 2d and having a fixed length.
2 and a permanent magnet 3 with different poles alternately present in the longitudinal direction 3
In addition, the power supply board 4 provided with the conductive parts 5 and 6 of positive and negative voltages is housed and arranged.

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 for arranging the permanent magnet 3 on the inner surface thereof, and has an approximately L-shaped support portion 2h, 2h for arranging the feeding substrate 4 on the inner surface of one side wall 2c. Further, the outer surface of the upper wall 2a has attachment protrusions 2j, 2j for attaching a power supply member described later. The attachment protrusions 2j, 2j 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 and a brush 13.

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 tip ends of the facing pieces 11a, 11a of the yoke 11 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
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, a power supply member which should be called an essential part of the present invention will be described with reference to FIGS. 1 to 4. In addition,
In FIG. 4, the mover block is omitted. This power supply member 14 includes two feedthrough capacitors 15 and 15 and terminal plates 17 and 17.
Is an essential member.

The feedthrough capacitors 15 and 15 are fixed through the feed-in plate 16. As shown in FIG. 1, the feed-in plate 16 of this embodiment is formed by bending a conductive metal plate material such as iron. Ie feedthrough capacitor 1
It has upper and lower pieces 16b and 16c bent in opposite directions with respect to a base portion 16a through which 5 and 15 are fixed, and both side pieces 16d and 16d bent in the same direction as the upper piece 16b. The upper piece 16b is the side piece 16
longer than d, 16d, and its width is the protrusion for attaching the stator case 2.
It can be fitted between 2j and 2j, and its end is drawn so as to project upward, and a screw hole 16e is formed in the center thereof. The lower piece 16c is also provided with a screw hole 16f, and the base portion 16a is provided with an insertion hole (not shown) through which the fixing screw 19 is inserted.

The terminal plates 17, 17 are bent and formed of a copper-based spring plate material, and mounted on the terminal plate holder 18. This terminal board 17
As shown in FIG. 2, a base portion 17a extending in the longitudinal direction is held by a holding portion 17b held by a terminal plate holding body 18, a spring portion 17c capable of bending in the thickness direction, and a connecting portion 17d for connecting lead wires. Then, a contact portion 17e, which is bent from the spring portion 17c and whose end face is in contact with the conductive portion of the power feeding substrate 4, is provided in series. These terminal boards 17, 17 are attached to the terminal board holder 18, and the power supply member 14 is completed.
The length of the contact portion 17e or the terminal plate holder 18 described later is designed so that the end surface of the contact portion 17e comes into contact with the power supply board 4 at a predetermined pressure when attached.

The terminal plate holder 18 of this embodiment is made of a plastic material. That is, when it is attached to the stator case 2, it has an abutting portion 18a that abuts on its end surface and is located outward, and a fitting portion 18b that fits into the abutment portion 18a and is located inside. More specifically, the contact portion 18a has a planar shape on the side of the fitting portion 18b that corresponds to the upper piece 2a of the stator case 2 and a part of both side pieces 2c, 2d.
L-shaped support protrusions 18c, 18c into which the upper piece 16b is fitted
And support recesses 18d, 18d into which both side pieces 16d, 16e are fitted are formed on both side surfaces. Also stator case 2
Mounted on the terminal board 1 at the position corresponding to the power supply board 4.
Two holding holes (not shown) are provided to press-fit and hold 7,17. A screw hole (not shown) is engraved at a position corresponding to the insertion hole of the feed-in plate 16 on the end surface on the side opposite to the fitting portion 18b, and is recessed except for the periphery thereof.

The fitting portion 18b is at least the stator case 2
When the holding parts 17b of the terminal plates 17 and 17 are pressed into the holding holes of the contact parts 18a, the spring parts 17c are fitted in the plate thickness direction. It has an outer shape that can be sufficiently bent (in the direction of the arrow in FIG. 4).

The power supply member 14 is assembled as follows. First, the feedthrough capacitors 15 and 15 are fixed through the feed-in plate 16, and the terminal plates 17 and 17 are fixed to the terminal plate holder.
Press-fit and hold to 18. Next, one end of the feedthrough capacitors 15 and 15 and the connecting portion 17d of the terminal plates 17 and 17 are connected by the lead wires 20 and 20. Further, the electric wires 21, 21 leading to the connector 22 are connected to the other ends of the feedthrough capacitors 15, 15. Next, the upper piece 16b of the feed-in plate 16 is attached to the support projections 18c, 1 of the terminal board holder 18.
Insert between 8c. At this time, feed-in plate 1
Both side pieces 16d, 16d of 6 are also supporting recesses 18d, 18d of the terminal board holding body 18.
Is fitted into. Next, the fixing screw 19 is inserted through the insertion hole of the feed-in plate 16 and screwed into the screw hole of the terminal plate holder 18 to make the feed-in plate 16 and the terminal plate holder 18
Are integrated, and the assembly is completed.

In the power supply member 14 as described above, the upper piece 16b of the feed-in plate 16 is a projection for attaching the stator case 2.
The fitting portion 18b of the terminal plate holder 18 is fitted into the inside of the stator case 2 between 2j and 2j. From the middle of the operation, the contact portions 17e of the terminal plates 17, 17 start to contact the end portions of the contact portions 17e of the power supply board 4 with the conductive portions 5, 6 of the power supply board 4 with the spring portion 17c being slightly bent. Then, the mounting screw 23 is screwed into the screw hole 16e of the upper piece 16b of the feed-in plate 16 in a state where the contact portion 18a of the terminal plate holder 18 is in contact with the end surface of the stator case 2.
The attachment screw 23 pulls up the upper piece 16b of the feed-in plate 16 and presses it against the attachment protrusions 2j, 2j, whereby the power supply member 14 is attached to the stator case 2. As a result, the contact portions 17e of the terminal plates 17 and 17 come into contact with the conductive portions 5 and 6 of the power supply board 4 at their end faces under a predetermined contact pressure, and electrical connection can be established between them.

Reference numeral 24 denotes a cap for covering the charging portion, which is fixed to the power supply member 14 with a screw 25 in a state of being covered.

This linear motor includes 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.

The specific structures of the feed-in plate 16 and the terminal plate holder 18 which constitute the power supply member 14 can be appropriately changed in design.

[0028]

In the linear motor of the present invention, when the power supply member is mechanically attached to the end of the stator case, the terminal plate of the linear motor is brought into pressure contact with the conductive portion of the power supply board for electrical connection. Therefore, at that time, the soldering work is not required, and the electrical connection between the feedthrough capacitor and the power supply board can be easily performed with high reliability.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a main part of an embodiment of the present invention.

FIG. 2 is a perspective view of the terminal board.

FIG. 3 is a partially cutaway side view showing a state in which the power supply member is attached to a stator case.

FIG. 4 is a front view with a part cut away when the mover block is omitted.

FIG. 5 is a 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 a cross-sectional view showing a state in which a conventional power supply member is attached to a stator case.

[Explanation of symbols]

 1 Stator block 2 Stator case 2a Stator case upper wall 2j Stator case attachment protrusion 3 Permanent magnet 4 Power supply board 5,6 Conductive part of power supply board 7 Mover block 8 Movable base 9 Roller 10 Transport object support Body 11 Yoke 12 Coil 13 Brush 14 Power supply member 15 Feedthrough capacitor of power supply member 16 Feed-in plate of power supply member 17 Terminal plate of power supply member 17b Terminal plate holder 17c Terminal plate spring 17d Connection of terminal plate 17e Terminal board contact area 18 Power supply member terminal board holder

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Keisho Hamamoto 1048, Kadoma, Kadoma-shi, Osaka 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 including a power supply board provided in a stator case with a positive and negative voltage conductive portion sandwiching a meandering insulating portion, 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. And a power supply member having a feedthrough capacitor attached to the end of the stator case, one end of the feedthrough capacitor being connected to the power supply, and the other end being connected to the conductive portion of the power supply board. The power supply member is provided with a terminal plate having one end connected to the feedthrough capacitor and the other end displaceable in the thickness direction of the power supply board, and when the terminal board is attached to the end portion of the stator case, the terminal board is provided. A linear motor configured to be in pressure contact with the conductive portion of the.