JP3528686B2 - Linear motor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power feeder which supplies power to a mover coil via a power supply brush via a power supply wire.
The present invention relates to a linear motor in which two movers are moved symmetrically with respect to two stators. 2. Description of the Related Art In a linear motor used for opening and closing a double curtain, it is necessary to symmetrically move two movers in an outer rail. For this reason, conventionally, two sets of linear motors were incorporated in the outer rail and two movers were separately driven, but the cost was high because two sets of linear motors were required. By the way, a stator in which permanent magnets having alternately different poles are alternately arranged at a constant magnetic pole pitch in the longitudinal direction and a power supply wire having a positive and negative conductor pattern are arranged in the outer rail, and the stator moves in the outer rail. A mover coil that is freely guided is provided with a mover that is connected to a power supply brush that is in sliding contact with the power supply wire, and the power supply wire and the power supply brush move the power supply brush relative to the permanent magnet. In a linear motor that supplies power to the mover coil such that a thrust in a certain direction is generated in the mover coil in response to the mover, two movers are symmetrically moved with respect to one stator. The following method is conceivable. First, on the stator side, (1) the arrangement of the permanent magnets is not changed, and the conductor pattern of the power supply wire is changed so that the thrust is reversed by half on one side from the center. (2) The arrangement of the permanent magnets is changed so that the thrust is reversed by one half from the center, without changing the conductor pattern of the power supply wire. Next, on the mover side, (3) the winding directions of the coils of the two movers are reversed. [0003] However, the above (1)
According to (2) , in the case of a linear motor in which the assembling reference is at the center and the length is set in several steps, the assemblability is poor and the manufacturing cost is high. Further, according to the above (3) , there is a risk of erroneous assembly. Furthermore, the above (1) to
In any of (3) , when power is supplied to the power supply overhead line from one end of the power supply overhead line, a voltage drop causes a difference in thrust of the two movers, and the movement of the two movers is unbalanced. is there. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In addition to being able to move two movers symmetrically with respect to one stator, the present invention has excellent assemblability, is inexpensive, and has a low power supply. It is an object of the present invention to provide a linear motor in which there is no difference in thrust between two movers even when power is supplied from one end of an overhead wire to a power supply overhead wire. In order to achieve the above object, a linear motor according to the present invention is provided with a permanent magnet in an outer rail which alternately has different magnetic poles at a constant magnetic pole pitch in a longitudinal direction thereof. A power supply brush, which is slidably contacted with the power supply wire, is connected to a stator having a power supply wire having positive and negative conductor patterns and a mover coil movably guided in the outer rail. A linear motor that includes a mover and supplies power to the mover coil such that a thrust in a fixed direction is generated in the mover coil according to a relative position to the permanent magnet by the power supply wire and the power supply brush. In the first, the first rail is disposed over the entire length of the outer rail.
A second power supply overhead wire having the same conductor pattern as the first power supply overhead wire is provided on one side half of the power supply overhead wire from the center, and the conductor pattern of the permanent magnet is different from the conductor pattern of the first power supply overhead wire. The first and second power supply lines are connected to each other at the center of the first power supply line, and the positive and negative sides of the first and second power supply lines are connected to each other so as to be shifted by the pitch. , Two movers having the same configuration are provided. [0005] The linear motor having the above-described structure, when power is supplied to the first power supply overhead line from one end of the first power supply overhead line on which the second power supply overhead line is overlapped, the first power supply overhead line. Power is also supplied to the second power supply overhead line at the center of the overhead line. And a movable element to which power is supplied from the first power supply wire, because the conductor pattern of the second power supply wire is shifted from the conductor pattern of the first power supply wire by the magnetic pole pitch of the permanent magnet of the stator; With the mover to which power is supplied from the second power supply wire, the direction of current supply to the coil is reversed, and the direction of thrust is opposite to each other. The mover directly supplied with power from the first power supply wire and the mover supplied with power via the second power supply wire are respectively symmetrical in the longitudinal direction with reference to the connection portion of the first and second power supply wires. Since they are arranged at positions, the lengths of the power supply paths to the respective movers are equal. Accordingly, the voltage drops are equal, and there is no difference between the thrusts of the two movers, so that the movement of the two movers is maintained smoothly and the two movers move smoothly. [0006] Also, the power supply overhead line is provided with a second power supply overhead line having the same conductor pattern as the first power supply overhead line on one side half from the center of the first power supply overhead line, and the conductor pattern is the first power supply overhead line. The conductor pattern is arranged so as to be shifted by the magnetic pole pitch of the permanent magnet, and the positive and negative sides of the first and second power supply overhead lines are connected at the center of the first power supply overhead line. Therefore, it can be manufactured at a lower cost as compared with a power supply overhead line in which the conductor pattern is changed so that the thrust is reversed in only one half from the center, and the assemblability to linear motors having different lengths is good. Embodiments of the present invention will be described with reference to the accompanying drawings. 1 is a cross-sectional view of a linear motor 1 for opening and closing a double-opening curtain, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, FIG. 3 is a perspective view of a mover 11, and FIG.
FIG. 5 is an exploded front view of a main part showing the 1 and the permanent magnet 6, and FIG. Linear motor 1
Outer rail 2 is an extruded product of aluminum material,
The outer shape is substantially cylindrical, and a groove 3 is formed on the lower surface. Further, inner rails 4 and 4 which are continuous in the longitudinal direction are formed inside the inner side. The inner rails 4 and 4 are provided with yokes 5 and 5 and permanent magnets 6 and 6 having alternate poles alternately at a constant magnetic pole pitch P in the longitudinal direction. The facing permanent magnets 6, 6 have mutually different polarities. In addition, a power supply wire mounting portion 7 is formed on a ceiling portion of the outer rail 2, and a power supply wire 21 described later is mounted thereon. The linear motor 1 has two movers 11, 1
1 are arranged at positions where the distance from the center is equal. As shown in FIG. 3, the mover 11 is formed by arranging three mover coils 13 each having a coil wound around a coil core 12 and integrally forming a traveling support portion 14 on an upper part. And three pairs of power supply brushes 15a and 15b connected to the lead wires of the power supply. Each of the movers 11, 11 is inserted between the inner rails 4, 4 of the outer rail 2 to support the upper traveling support portion 14 so as to be able to travel on the upper surfaces of the inner rails 4, 4, and to supply the power supply wire 21 with power. The brushes 15a, 15b are rubbed, and the hooks 16 for pulling the curtain runner attached to the lower surfaces of the movers 11, 11 project from the grooves 3 on the lower surface of the outer rail 2. The power supply terminal 2 is connected to the end of the first power supply wire 22 on the side where the second power supply wire 23 described later is superimposed.
9 and the first power supply wire 22 through the power supply terminal 29.
Power. As shown in FIG. 4 and FIG.
The first and second power supply wires 22 and 23 are formed by joining a positive conductor pattern 26a and a negative conductor pattern 26b made of copper foil to an insulating base film 24, respectively. The conductor pattern 26a on the positive side and the conductor pattern 26b on the negative side are so arranged that the direction of energization to the mover coil 13 is switched for each magnetic pole pitch P of the permanent magnet 6, that is, at a position relative to the permanent magnet 6. The conductor patterns 26a and 26b are formed in a fixed pattern in which the conductor patterns 26a and 26b are intricate with each other so that a constant thrust is generated in the mover coil 13 in response. [0010] The power supply wire 21 is provided on the second half of one side from the center of the first power supply wire 22 disposed over the entire length of the outer rail.
The power supply wire 23 is connected to the conductor patterns 26a and 26b.
Are the conductor patterns 26a and 26b of the first power supply wire 22
Are overlapped with each other so as to be shifted by the magnetic pole pitch P of the permanent magnet 6. Then, at the center of the first power supply wire 22, the positive conductor patterns 26 a of the first power supply wire 22 and the second power supply wire 23 and the negative conductor pattern 26 b are connected.
The two are connected by soldering 27 so that power can be supplied. Further, an insulating material 28 is interposed between the positive conductor pattern 26a of the first power supply overhead wire 22 and the negative conductor pattern 26b of the second power supply overhead wire that overlap between the two connection portions to provide insulation. Insulation material 2
As 8, a double-sided adhesive tape is used. In the linear motor 1 having the above structure, power is supplied to each of the movable elements 11 by the power supply wire 21 and the power supply brushes 15 a and 15 b rubbing the power supply wire 21, and the linear motor 1 is movable at every magnetic pole pitch P of the permanent magnet 6. The direction of energization of the secondary coil 13 is switched to change the magnetic pole generated in the coil core 12, and the permanent magnet 6
The movable elements 11 and 11 are moved in a certain direction by generating an attractive force or a repulsive force between the movable elements 11 and 11. The first power supply wire 22 and the second power supply wire 23 constituting the power supply wire 21 are respectively provided with the conductor patterns 26a and 26b.
Are shifted by the magnetic pole pitch P, so that the first
In the mover 11 that is supplied with power from the movable member 2 and the mover 11 that is supplied with power through the second power supply wire 23, the direction of current supply to each of the mover coils 13 is opposite, and thus each of the movers 11 is symmetrical in the opposite direction. To open and close the double curtain. The mover 11 to which power is supplied from the first power supply wire 22 and the mover 11 to which power is supplied from the second power supply wire 23 are located at the center of the linear motor 1, that is, the first and second power supply wires. Since they are arranged at positions equidistant from the connecting portions of the overhead wires 22 and 23, each movable element 11 and
The lengths of the power supply paths up to 11 are equal. Accordingly, the voltage drop of the power supply voltage to each of the movers 11, 11 becomes equal, and there is no difference in the thrust of each of the movers 11, 11. Therefore, the movement of each of the movers 11, 11 is maintained and the movement is smooth. I do. The power supply wire 21 has a second power supply wire 23 having the same conductor pattern as that of the first power supply wire 22 and a half of one side from the center of the first power supply wire 22. The first power supply wire 22 and the second power supply wire 22 are arranged at the center of the first power supply wire 22 so as to be shifted from the conductor pattern of the power supply wire 22 by the magnetic pole pitch P of the permanent magnet 6 of the stator. Since the positive side conductor pattern 26a and the negative side conductor pattern 26b of the 23 are connected so as to be able to supply power by soldering 27, a conductor such that the thrust is reversed by half of one side from the center as a power supply overhead line. It can be manufactured at a lower cost than the one in which the pattern is changed, and has good assemblability to linear motors having different lengths. Instead of connecting the conductor patterns 26a on the positive side and the conductor patterns 26b on the negative side of the first power supply wire 22 and the second power supply wire 23 at the center, instead of soldering 27 to connect them so that power can be supplied. , As shown in FIG.
The member 31 provided with 0 may be fixedly connected to the outer rail 2.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a linear motor according to the present invention. FIG. 2 is a sectional view taken along line AA in FIG. FIG. 3 is a perspective view of a mover. FIG. 4 is an exploded front view of a main part showing a power supply wire and a permanent magnet. FIG. 5 is a front view of a central portion of the power supply overhead line. FIG. 6 is an explanatory diagram showing another connection mode of the positive and negative conductor patterns. [Description of Signs] 1 ... Linear motor 2 ... Outer rail 6 ... Permanent magnet 11 ... Mover 13 ... Mover coils 15a and 15b ... Power supply brush 21 ... Power supply Overhead wire 22 ... First power supply wire 23 ... Second power supply wire 26a ... Positive conductor pattern 26b ... Negative conductor pattern P ... Pole pitch

Continuation of front page (56) References JP-A-11-42158 (JP, A) JP-A-9-312985 (JP, A) JP-A-5-328699 (JP, A) JP-A-5-3664 (JP) , A) JP-A-4-61486 (JP, U) JP-A-2-38987 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02K 41/00 A47H 5/02

Claims (1)

(57) [Claims 1] A permanent magnet having alternately different poles at a constant magnetic pole pitch in a longitudinal direction thereof and a power supply wire having a positive and negative conductor pattern are disposed in the outer rail. And a movable element formed by connecting a power supply brush slidingly contacting the power supply overhead wire to a movable coil guided movably in the outer rail, wherein the power supply overhead wire and the power supply A linear motor that supplies power to the mover coil such that a thrust in a fixed direction is generated in the mover coil in accordance with a relative position with respect to the permanent magnet by a brush, wherein the linear motor is disposed over the entire length of the outer rail. A second power supply overhead wire having the same conductor pattern as the first power supply overhead wire is provided on one side half from the center of the first power supply overhead wire, and the conductor pattern is fixed to the conductor pattern of the first power supply overhead wire. Magnet The first and second power supply wires are connected at the center of the first and second power supply wires at the center of the first power supply wire and are symmetrical in the longitudinal direction with respect to the connection portion. A linear motor in which two movers having the same configuration are disposed at positions.