JP2586707B2 - Linear motor - Google Patents

Description

The present invention relates to a DC three-phase linear motor used for conveyance.

[Conventional technology]

Conventionally, there are the following linear motors of this type.

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

The stator block is provided with a cylindrical guide rail, a plate-shaped permanent magnet magnetized in the thickness direction so that the lengthwise direction is alternately different in polarity at regular intervals, and a conductive part for positive and negative voltages on the same substrate surface. A power supply substrate. One end face of the thickness of the permanent magnet and the power supply board are fixed to two orthogonal surfaces of the inner wall of the guide rail along its longitudinal direction.

The mover block is composed of a substantially U-shaped iron core in which a coil is wound around the opposing piece in the reverse direction and the thickness direction of the permanent magnet is interposed between the opposing pieces, and three are arranged in the longitudinal direction of the permanent magnet. It is formed to include a three-phase electromagnet and a brush connected to the coil and fixed to one side of the opposing piece of the electromagnet.

Then, the brush slides while being pressed against the power supply substrate, and positive and negative voltages are alternately applied to the coil, so that the mover block moves in the longitudinal direction of the cylindrical guide rail.

[Problems to be solved by the invention]

In the above-described conventional DC three-phase linear motor, one power supply board is fixed to one surface along the longitudinal direction of the inner wall of the guide rail, and one of the opposing pieces of the electromagnet is attached to the power supply board. The brush fixed to the side slides while being pressurized and alternately applies positive and negative voltages to the coil, so that the mover block moves in the longitudinal direction of the cylindrical guide rail. Therefore, the mover block, in the direction orthogonal to the longitudinal direction of the guide rail,
While moving in an unstable state slightly inclined to one side,
The magnetic force acting between the opposing pieces of the permanent magnet and the electromagnet is also different, which makes it difficult to move smoothly. In addition, since the power supply substrate is provided with conductive portions of positive and negative voltages on the same substrate surface, there is a possibility that metal powder or the like may adhere between the conductive portions and cause a short circuit.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent a movable block from tilting in a direction orthogonal to the longitudinal direction of a guide rail and to conduct a positive / negative voltage provided on a power supply board. It is an object of the present invention to provide a DC three-phase linear motor that can move smoothly in the longitudinal direction of a guide rail without causing a short circuit in the section.

[Means for solving the problem]

In order to solve the above-described problems, the linear motor of the present invention includes a cylindrical guide rail and a plate-shaped permanent magnet that is magnetized in the thickness direction so that the longitudinal direction is alternately and alternately at different intervals. A power supply board provided with a conductive portion for positive and negative voltages, a stator block to which a permanent magnet and a power supply board are fixed along the longitudinal direction of the inner wall of the guide rail; A three-phase electromagnet made of a substantially U-shaped iron core in which the thickness direction of the mounted permanent magnet is interposed between the opposing pieces and arranged in three rows in the longitudinal direction of the permanent magnet; and a brush connected to the coil. A direct current three-phase linear motor in which a brush slides on the power supply substrate and positive and negative voltages are alternately applied to the coil to move the mover block. Central part on one side of flat substrate The remaining portion of the insulating portion, which is meandering vertically at regular intervals along the longitudinal direction at regular intervals, is separated into two conductive portions each having a positive and negative voltage, and the N pole of the permanent magnet in the longitudinal direction. Assuming that the length of a set of magnet pieces consisting of a magnetic pole and an S pole is L, the widths of the insulating portion and the conductive portion in the longitudinal direction are 2L / 3 and L / 3, respectively, and both pole faces of the permanent magnet are provided. Are fixed to both inner walls of the guide rail facing each other in a state of being shifted by L / 6 from each other.

[Action]

According to the linear motor of the present invention, the mover block composed of the three-phase electromagnets is provided on the outer side of the opposing piece of the iron core, respectively.
A pair of fixed brushes is slid in contact with the central part of the power supply board separated into two pieces while applying pressure, so that the current is continuously fed in any of two phases out of three phases in L / 6 steps. The positive and negative voltages can be switched and applied to the coil so that the current flows, and the pair of brushes can be moved substantially equally in both directions in a direction orthogonal to the longitudinal direction without receiving a force from both sides without tilting. Since the positive and negative voltage conductive portions are separated from each other by the two power supply boards, there is no short circuit caused by adhesion of metal powder or the like between the positive and negative voltage conductive portions.

〔Example〕

One embodiment of the present invention will be described below with reference to FIGS.

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

First, the stator block A is composed of a guide rail 1, a permanent magnet 2, and two power supply boards 3A and 3B as follows.

The guide rail 1 is made of a metal material such as aluminum.
As shown in the figure, the cross section is formed in a substantially rectangular cylindrical shape, a guide groove 1a is provided in the center of one piece, and an iron core 4a to be described later is formed on the inner wall of the guide rail 1 located on the opposite side to the guide groove 1a. Slip plate 1b with small coefficient of friction provided for easy sliding contact
Is provided. In addition, in the perspective view of the guide rail 1 in FIG. 1, the slip plate 1b is omitted.

The permanent magnet 2 is formed in a flat plate shape, and one end surface of the thickness is embedded in the slip plate 1b and fixed along the longitudinal direction of the inner wall of the guide rail 1, and as shown in FIG. It is magnetized in the thickness direction so as to alternately have different poles at regular intervals. Here, the length of one set of magnet pieces including the N pole and the S pole in the longitudinal direction is L.

The two power supply boards 3A and 3B are provided on one side of a flat board.
As shown in FIG. 3 (a), an insulating portion 3a meandering vertically and at right angles along the longitudinal direction at regular intervals is formed at a central portion, and the remaining portion formed by the insulating portion 3a is a power supply substrate 3A. The conductive portion 3b has a positive voltage, and the conductive portion 3c has a negative voltage on the power supply board 3B. Here, the width of the insulating portion 3a is 2L / 3 in the longitudinal direction.
In addition, the width of the conductive portions 3b and 3c is formed to be L / 3, respectively.
The power supply substrates 3A and 3B are fixed along the longitudinal direction of both inner walls of the guide rail 1 on which both magnetic pole surfaces of the permanent magnet 2 face, and the portions of the conductive portions 3b and 3c having the width of L / 3 are fixed. , L / 6
They are arranged offset from each other.

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

The electromagnet 4 is formed by winding coils 4d around opposite pieces 4b and 4c of a substantially U-shaped iron core 4a in reverse winding.

The brush 5 is formed by fixing a contact at the center of the outside of a curved leaf spring, and is fixed one by one to the outside of the opposing pieces 4b and 4c of the iron core 4a, and a pair thereof is connected.

In the mover block B, the three electromagnets 4 are arranged in a row so that the opposing pieces 4b and 4c are arranged in a straight line, and are integrally fixed to a coupling body 4e having a T-shaped cross section. ,
One end is connected to each brush 5 and the other end is commonly connected.
It consists of phase electromagnets. At this time, the length of each electromagnet in the row direction is set not to exceed L / 3, and the interval between the brushes 5 is set to L / 3.

The mover block B has the permanent magnet 2 interposed between the opposing pieces 4b and 4c of the iron core 4a in the 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 substrate 3; The piece is housed in the stator block A so as to protrude from the guide groove 1a of the guide rail 1. This T-shaped cross-section body
4e is a connecting piece 4f in which a vertical piece is connected to a hole 4g provided with a transferred object such as a curtain at the front end, and a horizontal piece smoothens the movement of the mover block B at both ends. Roller 4h is provided for this.

By operating the linear motor as described above, the pair of brushes 5, 5 slidably contact with the power supply substrates 3A, 3B while applying pressure by their own spring force to the one of the three-phase coils 4d. Positive and negative voltages are applied to the coil 4d so that current always flows in the phase. For example, when the two electromagnets at both ends are in the state shown in FIG. The mover block B advances in the direction of the arrow by L / 6 due to the propulsive force acting between the magnetic poles of the magnet 2 and the state shown in FIG. 3C in which two electromagnets are excited at the rear end. Subsequently, the same action further advances by L / 6. After that, it progresses continuously by L / 6, and L / 6 is 6
And the state returns to the state shown in FIG. In this way,
The mover block B smoothly advances in the longitudinal direction of the stator block A. When moving the mover block B in the reverse direction, the conductive portions 3b,
What is necessary is just to reverse the polarity of the voltage of 3c.

In such a linear motor, as described above,
The mover block B composed of the phase electromagnets 4 has a pair of brushes 5, 5 fixed one by one on the outside of the opposing pieces 4b, 4c of the iron core 4a, respectively. By pressing and sliding against the center of the coil 4d, the positive and negative voltages can be switched and applied to the coil 4d so that the current always flows in any two phases out of the three phases in L / 6 steps at a time. A pair of brushes 5, 5 can be moved substantially equally in both directions in a direction perpendicular to the longitudinal direction thereof without being inclined by receiving a force from both sides, and between the conductive parts of the positive and negative voltages separated into two power supply boards 3A, 3B. No short-circuit occurs due to the adhesion of metal powder and the like to the DC rail, and a DC three-phase linear motor that moves smoothly and continuously in the longitudinal direction of the guide rail 1 can be realized.

Further, a pair of brushes 5,
In the case where each of the power supply substrates 5 is displaced from a predetermined position and is fixed, since the power supply substrate is separated into two power supply substrates 3A and 3B, when the power supply substrates 3A and 3B are fixed to the guide rail 1, Can be adjusted to each other by the amount of the deviation so as to be at a predetermined position.

〔The invention's effect〕

In the linear motor according to the present invention, the power supply board is formed such that the remaining portions of the insulating portion, which are formed in a central portion on one side of the flat substrate at regular intervals vertically and vertically meanderingly along the longitudinal direction, have positive and negative voltages, respectively. And separated into two conductive parts,
Assuming that the length of one set of magnet pieces composed of the N pole and the S pole of the permanent magnet in the longitudinal direction is L, the widths of the insulating part and the conductive part in the longitudinal direction are 2L / 3 and L / 3, respectively. Since each of the permanent magnets is fixed to both inner walls of the guide rail facing both magnetic pole faces in a state shifted by L / 6 from each other, the mover block composed of the three-phase electromagnets is made of iron. A pair of brushes, one each fixed to the outside of the opposing piece of the core, slides in contact with the central part of the two power supply boards while pressing each of them.
A positive and negative voltage can be switched and applied to the coil so that a current always flows in any two of the phases in a forward direction, and a pair of brushes receives forces from both sides in a direction orthogonal to the longitudinal direction thereof substantially uniformly. It can move without tilting, and there is no short circuit due to adhesion of metal powder etc. between the conductive parts of positive and negative voltage separated on the two power supply boards, and it moves smoothly continuously in the longitudinal direction of the guide rail DC three-phase linear motor can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention, FIG. 2 is a sectional view of the same, FIG. 3 (a) is a front view of two power supply boards of the same, FIG. (C) is an explanatory view showing the operation state of the mover block. A: stator block, 1: guide rail, 2: permanent magnet, 3A, 3B: two power supply boards, 3a: insulating part, 3b, 3c: conductive part, B: movable block 4, electromagnet, 4a, iron core, 4b, 4c, opposing piece, 4d
Coil, 5 ... brush.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-277164 (JP, A) JP-A-2-46157 (JP, A) JP-A-1-103385 (JP, U) JP-A-61-2 52492 (JP, U) Actually open Sho 64-6782 (JP, U)

Claims (1)

(57) [Claims] 1. A power supply board provided with a cylindrical guide rail, a plate-shaped permanent magnet magnetized in the thickness direction such that the longitudinal direction alternately has a different polarity at regular intervals, and a conductive part for positive and negative voltages. ,
And a stator block to which a permanent magnet and a power supply board are fixed along the longitudinal direction of the inner wall of the guide rail, and a coil wound around the opposite piece in a reverse winding, and the thickness direction of the permanent magnet is interposed between the opposite pieces. A movable block having a three-phase electromagnet made of a substantially U-shaped iron core mounted in the longitudinal direction of the permanent magnet and having three brushes connected to a coil; In a DC three-phase linear motor in which a mover block moves by applying a positive or negative voltage to a coil alternately while being in contact with a substrate, the power supply substrate is provided at a central portion on one side of a flat substrate at regular intervals. The remaining portion of the insulating portion formed to meander vertically along the longitudinal direction at right angles is separated into two portions each of which is a conductive portion for positive and negative voltages, and the N pole and the S pole of the permanent magnet in the longitudinal direction. A set of magnet pieces Assuming that the length is L, the widths of the insulating portion and the conductive portion in the longitudinal direction are 2L / 3 and L / 3, respectively. A linear motor wherein the sheets are fixed while being shifted from each other by L / 6.