JPH05236729A - Linear motor - Google Patents

Abstract

PURPOSE:To see that the fixation to a guide rail of a permanent magnet easily and certainly. CONSTITUTION:A guide rail 1 and a permanent magnet 2 are provided with a projection la and a projection 2a, respectively, in longitudinal direction. An engaging member 21 is molded in nearly plate shape out of resin material, and recesses 21a are provided in longitudinal direction on both sides in board thickness direction. Accordingly, the permanent magnet 2 is provided with a projection 2a not with a recess, so even if a magnetic field is added for magnetization while it is in soft condition immediately after extrusion molding, it is never deformed, and also if the projection 1a of the guide rail 1 is set to the other recess 21a, in the condition that the projection 2a of the permanent magnet 2 is set to one side of the recesses 21a of the engaging member 21, the permanent magnet 2 can be fixed easily and besides certainly to the guide rail 1.

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 opening and closing curtains and conveying articles.

[0002]

2. Description of the Related Art Conventionally, as a linear motor of this type, there is the following one having a stator block A and a mover block B, which will be described with reference to FIG.

The stator block A is magnetized in the plate thickness direction so that the longitudinal direction of the stator block A and the cylindrical guide rail 1 provided with the ridges 1a are alternately different poles at regular intervals. Along with the longitudinal direction of the inner wall of the guide rail 1, a substantially flat plate-shaped permanent magnet 2 having a concave strip 2a fitted in the convex strip 1a of the guide rail 1 in the longitudinal direction and a conductive part of positive and negative voltage on one surface are provided. The power supply board 3 is fixedly attached.

Since the permanent magnets 2 have the same length in every cross section, they are processed by extrusion molding, and their magnetization is performed by applying a magnetic field in the plate thickness direction immediately after extrusion molding. .

The mover block B has substantially U-shaped iron cores 4a in which coils 4d are wound in opposite directions on opposing pieces 4b, 4c via coil frames, and the iron cores 4a face each other. Piece 4b, 4
An electromagnet device in which three electromagnets 4 each having a permanent magnet 2 interposed in the plate thickness direction are provided between c and a coil fixed to the outer side of one facing piece 4b of the iron core 4a via an insulating member 5a. And a brush 5 connected to 4d.

The operation is performed by the brush 5 slidingly contacting one surface of the power supply board 3 and positive and negative voltages are alternately applied to the coil 4d to move the mover block B in the longitudinal direction of the guide rail 1. The curtains connected to the child block B are opened and closed and articles are transported.

[0007]

In the conventional linear motor described above, the permanent magnet 2 is formed by extrusion molding, and the recess 2a to be fitted to the projection 1a of the guide rail 1 is provided in the longitudinal direction. As it is formed, its magnetization is performed by applying a magnetic field in the plate thickness direction immediately after it is extruded, but when this magnetic field is applied, it is just after extrusion and is still in a soft state. As shown in FIG. 6, the groove 2a is deformed inward by the magnetic field. Therefore, the groove 2a of this permanent magnet 2 should be attached to the guide rail 1
When the ridge 1a is to be fitted to the ridge 1a, the ridge 1a is provided along the longitudinal direction of the inner wall of the tubular guide rail 1, so that the deformed ridge 2a can be fitted to the ridge 1a with ease. Difficult to do, and even if it fits well, guide rails 1
It may not be installed parallel to and perpendicular to the inner wall of the.

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 which can easily and reliably fix a permanent magnet to a guide rail. is there.

[0009]

In order to solve the above-mentioned problems, the linear motor of the present invention has a cylindrical guide rail provided with a ridge along the longitudinal direction of the inner wall and a constant interval in the longitudinal direction. A substantially flat plate-shaped permanent magnet magnetized in the plate thickness direction so as to alternately have different polarities, and a power supply board fixed along the longitudinal direction of the inner wall of the guide rail by providing a conductive portion of positive and negative voltages on one surface. And a stator block having a substantially U-shaped iron core in which coils are wound on the facing pieces in mutually opposite directions, and the plate thickness direction of the permanent magnet is interposed between the facing pieces of the iron core. A mover block including an electromagnet device in which a plurality of mounted electromagnets are arranged in a row, and a brush connected to a coil,
A linear motor in which the brush is slidably in contact with one surface of the power supply board and positive and negative voltages are alternately applied to the coil to move the mover block in the longitudinal direction of the guide rail. Is provided in the longitudinal direction of each surface and is provided with a fitting member made of a resin material having a recess along the longitudinal direction of each surface, and a projection is provided on the permanent magnet, and each recess of the fitting member is provided. The permanent magnets and the convex strips of the guide rails are fitted to each other.

[0010]

According to the linear motor of the present invention, since the permanent magnet is provided with the convex strip instead of the concave strip as in the conventional example, the permanent magnet is still in a soft state immediately after extrusion molding. Even if a magnetic field is applied to magnetize the magnets, the guide rails will not be deformed along the longitudinal direction of the cylindrical inner wall when the permanent magnets are fixed to the guide rails. Even if it is provided, the convex strip of the permanent magnet is fitted into one of the concave strips provided along the longitudinal direction of the two planes of the fitting member made of a resin material so as to be integrated with the other of the fitting strips. By fitting the convex strips of the guide rails into the concave strips, it becomes possible to easily and surely fix them.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The same members as those in the conventional example are designated by the same reference numerals.

This linear motor comprises a stator block A and a mover block B and is constructed as follows.

First, the stator block A is a guide rail.
It consists of 1, a permanent magnet 2 and a power supply board 3.

The guide rail 1 is made of a metal material such as aluminum and is formed into a tubular shape with both ends open and a substantially rectangular cross section. As shown in FIG. 1, the width of the guide rail 1 is wider at the center of the inner wall of the upper side. The ridge 1a is provided with a guide groove 1b at the center of the lower side along the longitudinal direction. Further, the inside of the rectangle is divided into upper and lower two-stage spaces by a partition wall 1c having an opening in part.

The permanent magnet 2 is formed by extrusion molding into a substantially flat plate shape by providing a ridge 2a having the same shape as the ridge 1a of the guide rail 1 along the longitudinal direction at the center of one end face of the plate thickness. Immediately after the extrusion molding, a magnetic field is applied in the plate thickness direction so that the longitudinal direction is alternately magnetized in the plate thickness direction at regular intervals as shown in FIG. Here, the length of one set of magnet pieces consisting of N poles and S poles in the longitudinal direction is L. And the permanent magnet 2 is
The fitting member 21 fixes the guide rail 1 in the following manner.

The fitting member 21 is formed of a resin material into a substantially flat plate shape having the same width as the permanent magnet 2 and extending in the longitudinal direction.
On both sides in the plate thickness direction, dovetail-shaped recessed ridges 21a to which the ridges 1a of the guide rail 1 and the ridges 2a of the permanent magnet 2 can be fitted are provided along the longitudinal direction. And the permanent magnet 2
As shown in FIG. 2, the ridge 2a is fitted to one concave ridge 21a of the fitting member 21 and is post-bonded to be fixed to the fitting member 21, and then, as shown in FIG. The ridge 1a of the guide rail 1 is fitted into the other recess 21a of the fitting member 21 and post-bonded to fix the permanent magnet 2 to the guide rail 1.

As shown in FIG. 4, the power supply board 3 has a positive voltage conductive part 3b and a negative voltage conductive part 3c on one surface of the flat board at right angles in the vertical direction at a constant interval. It is made of copper foil so as to be separated into upper and lower parts by the meandering insulating part 3a. Here, the width of the insulating portion 3a in the longitudinal direction is L
/ 6, the widths of the conductive portions 3b and 3c in the longitudinal direction are formed to be L / 3, respectively. The power supply board 3 is fixed to the inner wall on one side of the guide rail 1.

Next, the mover block B is composed of three electromagnets.
It consists of an electromagnet device consisting of 4 and a brush 5.

The electromagnet 4 is a facing piece 4 of a substantially U-shaped iron core 4a.
Coils 4d are formed on b and 4c by winding them in opposite directions via a coil frame.

The brush 5 is fixed to the outside of the one facing piece 4b of each electromagnet 4 via an insulating plate 5a.

The mover block B includes three electromagnets.
4 is fixed to the row body 4e so that the facing pieces 4b and 4c are lined up in a straight line, and each coil 4d is connected to each brush 5 at one end and commonly connected at the other end. Three
It is configured as a phase electromagnet device. At this time, the lengths of the electromagnets 4 in the arranging direction are set not to exceed L / 3, and the intervals between the brushes 5 are set to L / 3.

The mover block B is a guide rail 1
In the upper space, the permanent magnet 2 is interposed between the facing pieces 4b and 4c of the iron core 4a in the plate thickness direction, and the brush 5 is attached to the power feeding board 3
It is housed in the stator block A so that the substantially central portion of one surface is in sliding contact. On the other hand, in the lower space of the guide rail 1, the conveying piece 4f is provided with the opening of the partition wall 1c and the guide groove.
The transfer piece 4f is extended from the row body 4e so as to project to the outside through the 1b, and a roller 4g that rolls the inner wall of the lower side of the guide rail 1 in the longitudinal direction is provided on the transport piece 4f. For example, a connection hole 4h to which a conveyed object such as a curtain is connected is provided.

Next, the operation of this linear motor will be described. When the brush 5 is brought into sliding contact with one surface of the power supply board 3, 3
Positive and negative voltages are applied to the coil 4d so that current always flows in any two phases of the phase coils 4d. For example, when the two electromagnets 4 at both ends are excited and in the state of FIG. 4, the opposing pieces 4b, 4c of the iron core 4a which are the magnetic poles of the electromagnet 4
The mover block B is moved in the direction of the arrow L / 6 by the propulsive force due to the attraction and repulsion between the magnet and the magnetic pole surface of the permanent magnet 2.
Progresses. Then, this time, the sliding contact position of the brush 5 with respect to the power supply substrate 3 is changed, the two electromagnets 4 at the rear end are excited, and subsequently the same action further advances by L / 6. After that, proceed continuously in L / 6 increments until L / 6 reaches 6
It progresses once and returns to the state of FIG. In this way, the mover block B advances in the longitudinal direction of the guide rail 1. When moving the mover block B in the reverse direction, the positive and negative voltages of the conductive portions 3b and 3c of the power supply board 3 may be reversed. If the mover blocks B are connected in integral multiples, the carrying force increases substantially in proportion to the number of connections.

In such a linear motor, the permanent magnet
In the case of 2, the ridges 2a are provided instead of the ridges as in the conventional example.Therefore, even if a magnetic field is applied for magnetization while still in a soft state immediately after extrusion, it can be deformed. In addition, when the permanent magnet 2 is fixed to the guide rail 1, even if the ridge 1a of the guide rail 1 is provided along the longitudinal direction of the cylindrical inner wall, it is formed of a resin material in a substantially flat plate shape. In the state where the convex strips 2a of the permanent magnet 2 are fitted and integrated into one of the concave strips 21a provided on both sides of the fitting member 21 in the plate thickness direction, the guide rail 1 is fitted to the other concave strip 21a of the fitting member 21. By fitting the convex ridges 1a, the ridges 1a can be easily fixed, and moreover, the ridges 1a can be securely fixed parallel to the inner wall of the guide rail 1 and vertically.

In the present embodiment, the permanent magnet 2 and the fitting member 21 are formed by the concave stripes 21a provided on both sides of the fitting member 21 in the plate thickness direction.
The ridge 2a of the permanent magnet 2 is fitted on one side and fixed by post-adhesion, but both may be integrally formed by extrusion so as to have the same shape as the fixed state. In this case, the fitting member 21 has the groove 21a, but since it is made of a resin material, even if a magnetic field is applied in a still soft state immediately after extrusion molding, the permanent magnet having the groove of the conventional example. There is no deformation like.

Further, although the fitting member 21 is formed in a substantially flat plate shape in the present embodiment, the present invention is not limited to this, and the guide rail is not limited thereto.
1 and at least two planes on which the two ridges 2a of the permanent magnet 2 can be provided may be used.

[0027]

Since the linear motor of the present invention is constructed as described above, since the permanent magnet is provided with a convex strip rather than a concave strip as in the conventional example, it is still in a soft state immediately after extrusion molding. Even if a magnetic field is applied to magnetize the magnets, the guide rails will not be deformed along the longitudinal direction of the cylindrical inner wall when the permanent magnets are fixed to the guide rails. Even if it is provided, the convex strip of the permanent magnet is fitted into one of the concave strips provided along the longitudinal direction of the two planes of the fitting member made of a resin material so as to be integrated with the other of the fitting strips. By fitting the convex strips of the guide rails into the concave strips, it becomes possible to easily and surely fix them.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a partial perspective view showing a state in which the above permanent magnet is fitted to a fitting member.

FIG. 3 is a partially cutaway perspective view of the above.

FIG. 4 is an explanatory diagram showing an operation state of the above.

FIG. 5 is a cross-sectional view showing a conventional example.

FIG. 6 is a partial cross-sectional view showing a modification of the above permanent magnet.

[Explanation of symbols]

 A Stator block 1 Guide rail 1a Convex ridge 2 Permanent magnet 2a Convex ridge 21 Fitting member 21a Recessed ridge 3 Power supply board 3b Positive voltage conductive part 3c Negative voltage conductive part B Mover block 4 Electromagnet 4a Iron core 4b Opposite piece 4c Opposite piece 4d Coil 5 Brush

Claims (1)

[Claims] 1. A tubular guide rail provided with a convex strip along the longitudinal direction of the inner wall and a substantially flat permanent plate magnetized in the plate thickness direction so that the longitudinal direction is alternately different poles at regular intervals. A stator block including a magnet and a power supply board provided with a positive and negative voltage conductive portion on one surface and fixed along the longitudinal direction of the inner wall of the guide rail, and a coil on the opposite piece in opposite directions. An electromagnet device in which a plurality of electromagnets each having a wound U-shaped iron core and having a permanent magnet interposed in the plate thickness direction between the opposing pieces of the iron core are arranged in a row, and a brush connected to a coil And a mover block including, and a brush is slidably brought into contact with one surface of the power supply substrate while being positively and negatively applied to the coil while the brush is biased to one surface of the power supply board. In a linear motor that moves in the longitudinal direction, at least 2 A resin-made fitting member that has a surface and extends in the longitudinal direction and that has a recess along the longitudinal direction of each surface is provided. A linear motor characterized in that a permanent magnet and a ridge of a guide rail are fitted to the ridge.