JPH07118900B2 - Linear motor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a linear motor used for transportation and having a curve in a part of a transportation path.

[Conventional technology]

Conventionally, there are the following linear motors of this type, which will be described with reference to FIGS. 5 to 7.

This linear motor includes a stator block A and a mover block B.

First, the stator block A is configured by the guide rails 1, the permanent magnets 2, and the power feeding board 3 as follows.

The guide rail 1 is formed of a metal material such as aluminum into a tubular shape having a substantially rectangular cross section, and has a curved portion in a part in the longitudinal direction.

The permanent magnet 2 is formed in a flat plate shape and is magnetized in the plate thickness direction so that the longitudinal direction is alternately different poles at regular intervals, and one end face of the plate thickness is along the longitudinal direction of the guide rail 1. It is fixed to its inner wall. Here, the length of one set of magnet pieces consisting of N pole and S pole in the longitudinal direction is L.

The power supply board 3 is provided on one side of a flat board as shown in FIG.
As shown in Fig. 3, an insulating part 3a is formed in the central part, and the insulating part 3a meanders vertically at a regular interval.
It is formed to be 3c. Here, the width of the insulating portion 3a in the longitudinal direction is L / 6, and the width of the conductive portions 3b, 3c in the longitudinal direction is L /
3 are formed respectively. And this power supply board 3
Is fixed to the inner wall on one side of the guide rail 1 facing the magnetic pole surface of the permanent magnet 2.

Since the guide rail 1 has a curved portion in a part in the longitudinal direction as described above, the permanent magnet 2 and the power feeding board 3 are provided.
Is also curved according to the curved shape of the curve.

Next, the mover block B is configured by the electromagnet device including the three electromagnets 4 and the brush 5 as follows.

The electromagnet 4 includes a coil 4 on the facing pieces 4b and 4c of a substantially U-shaped iron core 4a.
Each d is formed by winding in reverse.

The brush 5 includes the facing pieces 4b, 4 forming the iron core 4a of each electromagnet 4.
It is fixed to one outer side of c via an insulating plate 5a.

In the mover block B, the three electromagnets 4 are arranged in a row so that the facing pieces 4b and 4c are aligned in a straight line, and are integrally fixed to the fixing member 4e. , And the other end is commonly connected to a three-phase electromagnet device. At this time, the lengths of the electromagnets in the arranging direction are set not to exceed L / 3, and the distance between the brushes 5 is set to L / 3.

In the mover block B, the brush 5 is positioned between the opposing pieces 4b and 4c of the iron core 4a in the plate thickness direction of the permanent magnet 2, and the brush 5 is positioned so as to be in sliding contact with the center of the power supply board 3 so that the stator block A It is housed in. Further, the locking piece 4f extended so as to protrude from the fixing member 4e is provided with a roller 4h for smoothing the movement of the mover block B, and the locking piece 4f is provided with, for example, a curtain or the like. 4g hole for holding the transported object
Is provided.

The operation of this linear motor is configured as described above, so that the brush 5 comes into sliding contact with the power supply board 3 and the three-phase coil 4d
A positive or negative voltage is applied to the coil 4d so that a current always flows in any two of the two phases. For example, in the state of FIG. 7 (b), the moving element block B advances in the direction of the arrow L / 6 in the arrow direction by the propulsive force acting between the electromagnet 4 and the permanent magnet 2 and the state of FIG. 7 (c). Then, after that, L / 6 was advanced 6 times by the same action, and the same figure (b)
Return to the state of. In this way, the mover block B advances in the longitudinal direction of the guide rail 1 which serves as a conveyance path. When moving the mover block B in the opposite direction, the positive and negative voltages of the conductive portions 3b and 3c of the power supply board 3 may be reversed.

[Problems to be Solved by the Invention]

In the above-described conventional linear motor, since the guide rail 1 serving as the transport path has a curved portion in a part in the longitudinal direction, the mover block B in which the three electromagnets 4 are arranged in line is
When the curved portion is moved, if the curved portion has a small degree of bending, it is possible to move with a little effort, but if the degree is relatively large, the curved portion cannot be moved.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a movable element with a curved portion even if the guide rail has a relatively large curved portion in a part of its longitudinal direction. It is to provide a linear motor that allows blocks to move smoothly.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the linear motor of the present invention is magnetized in the plate thickness direction such that a cylindrical guide rail having a curved portion in the longitudinal direction and the longitudinal direction alternately have different poles at regular intervals. Having a flat plate-shaped permanent magnet and a power feeding substrate provided with a positive and negative voltage conductive portion, the stator block having the permanent magnet and the power feeding substrate fixed along the longitudinal direction of the inner wall of the guide rail, and the opposing piece. The coil is connected to the coil with an electromagnet device in which a plurality of electromagnets each having a substantially U-shaped iron core wound in a reverse winding and having a permanent magnet interposed in the plate thickness direction between the opposing pieces are arranged in a row. A brush, and a mover block having a brush, wherein the brush slides on a power supply substrate and positive and negative voltages are alternately applied to the coil to move the mover block. Are integrally molded, each of which Between the opposed surfaces which are column set of magnets are configured, which are connected by a connecting member of the bellows-shaped.

[Action]

According to the linear motor of the present invention, in the mover block, the iron core of the electromagnet and the coil are integrally molded to form a protrusion, and the recess provided in the bellows-shaped connecting member is fitted to the protrusion. Since the facing surfaces of the electromagnets are connected by the bellows-shaped connecting member, even when the guide rail has a relatively large curved portion in a part of the longitudinal direction, the bellows-shaped connecting member bends the curve. Since the mover block moves along the portion while expanding and contracting, the mover block can smoothly move on the guide rail.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. In addition, substantially the same members as those of the conventional example are denoted by the same reference numerals, and only different points from the conventional example, that is, the structure of the mover block B will be described.

The mover block B is configured as follows by an electromagnet device including three electromagnets 4, a brush 5, and a connecting member 6.

As shown in FIG. 3, in the electromagnet 4, the coil 4d is wound in reverse winding on the opposing pieces 4b and 4c of the substantially U-shaped iron core 4a as in the conventional example. As shown in (a), the iron core 4a and the coil 4d are made of an insulating material such as synthetic resin.
Is integrally formed in a U shape. At this time, as shown in FIG. 2 (b), a protrusion 4k having a circular cross section and a slight depression at the base is provided at the center of the U-shaped end surfaces 4i, 4j so as to project in a U-shape. ing.

The brush 5 is fixed to one outer surface of the electromagnet 4 via an insulating plate 5a.

The connecting member 6 is made of synthetic resin such as soft vinyl chloride.
As shown in FIG. 4, it is formed in a bellows shape with a thickness of about 1 mm and a U-shaped cross section, and both end surfaces 4 of the electromagnet 4 are formed at both ends thereof.
Flat plate-shaped collar portions 6a and 6b having the same U shape as i and 4j are provided. And, a recess 6c is formed in the center of the collar 6a, 6b.
Is formed in a U shape. As shown in FIG. 4 (b), the recess 6c has a circular cross section and is formed by slightly projecting the base so that the recess 6c can be fitted into and combined with the projection 4k of the electromagnet 4.

In the mover block B, as shown in FIG. 1, the three electromagnets 4 have their end faces 4i and 4j face each other, and the projections 4k and the recesses 6c of the connecting member 6 are fitted and coupled between the facing faces. As a result, the electromagnets 4 are connected by the connecting member 6. At this time, the length of each electromagnet 4 in the row direction is set not to exceed L / 3, and the distance between each brush 5 is set to L / 3.

When the mover block B is arranged in the stator block A, the three electromagnets 4 are not fixed integrally by the fixing member 4e as in the conventional example, but are fixed to the respective electromagnets 4. By being fixedly provided to the member, the same operation as the conventional example is basically performed.

In such a linear motor, the mover block B is
The iron core 4a and the coil 4d of the electromagnet 4 are integrally molded to form the protrusion 4k, and the recess 6c provided in the bellows-shaped connecting member 6 is formed.
Since the opposing surfaces of the electromagnets 4 are connected by the bellows-shaped connecting member 6 by fitting the protrusions 4k to the protrusions 4k,
Even when the guide rail 1 has a curved portion with a relatively large curvature in a part of the longitudinal direction, the bellows-shaped connecting member 6 moves along the curved portion while expanding and contracting, so that the mover block is fixed to the guide rail. 1 can be moved smoothly. At this time, the bellows-shaped connecting member 6 is expanded and contracted so that the outside of the curved portion expands and the inside contracts, but the expansion and contraction does not impair the length relationship of the electromagnets 4 in the arranging direction. Of course there is.

In this embodiment, the connecting member 6 is connected as a member separate from the electromagnet 4, but it may be integrally formed at the same time when the electromagnet 4 is molded with an insulating material such as synthetic resin. Good.

〔The invention's effect〕

In the linear motor of the present invention, in the mover block, the iron core of the electromagnet and the coil are integrally formed to form a protrusion, and the recess provided in the bellows-shaped connecting member is fitted into the protrusion to allow the electromagnet to move. Since the opposing surfaces are connected by the bellows-shaped connecting member, even when the guide rail has a relatively large curved portion in a part of the longitudinal direction, the bellows-shaped connecting member is formed in the curved portion. Since the mover block moves along with expansion and contraction along the guide rail, the mover block can smoothly move on the guide rail.

[Brief description of drawings]

FIG. 1 is a perspective view showing a mover block of one embodiment of the present invention, FIG. 2 (a) is a perspective view showing an electromagnet of the same, and (b) is a projection provided on the electromagnet of the same. Sectional drawing, FIG. 3 is a perspective view showing a state before integrally molding the electromagnet of the same, FIG. 4 (a) is a perspective view showing a connecting member of the same, and (b) is a connecting member of the same. Sectional drawing which shows the recessed part provided, (c) is sectional drawing of the connection member same as the above, FIG. 5 is a perspective view which shows a prior art example, FIG. 6 is sectional drawing same as the above, FIG. 7 (a) is , A front view of the power feeding board, and (b) and (c) are explanatory views showing an operating state of the mover block. A: Stator block, 1 ... Guide rail, 2 ... Permanent magnet, 3 ... Feeding board, 3b, 3c ... Conductive part, B ... Mover block, 4 ... Electromagnet, 4a ... Iron core , 4b, 4c ……
Opposing piece, 4d ... Coil, 4h, 4i ... Opposing surface, 5 ... Brush, 6 ... Connecting member.

Claims (1)

[Claims] 1. A tubular guide rail having a curved portion in the longitudinal direction, a plate-shaped permanent magnet magnetized in the plate thickness direction so that the longitudinal direction is alternately different poles at regular intervals, and a positive and negative voltage. A power supply board provided with a conductive portion, a stator block having a permanent magnet and a power supply board fixed along the longitudinal direction of the inner wall of the guide rail, and a substantially coil in which the opposite piece is wound with coils in reverse winding. A mover block having an electromagnet device in which a plurality of electromagnets having a V-shaped iron core and having a permanent magnet interposed in the plate thickness direction between the opposing pieces are arranged in a row, and a brush connected to a coil, In a linear motor in which the brush slides on the power supply board and positive and negative voltages are alternately applied to the coils to move the mover block, the iron core of the electromagnet and the coil are integrally formed, and the electromagnets are arranged in rows. Bellows-shaped connecting part between the facing surfaces Linear motor, characterized in that it is connected in.