JPH08275493A - Linear motor for automatic door - Google Patents

Abstract

PURPOSE: To provide a linear motor which has a smaller-size engine and has no disconnection of a lead due to the movement of a movable member by simplifying the structure of the linear motor and a connection between the linear motor and a door. CONSTITUTION: A movable member block A which is constituted of permanent magnets 1 moves along a stator block B which is constituted of an electromagnet 14. In the movable member block A, the permanent magnets 1 which are magnetized in opposite polarities in the thickness direction are so located at equal intervals in the longitudinal direction that polarities of magnetic pole faces in the same direction may be alternately changed. The stator block B has a stator base 2, an electromagnet 14 which consists of an iron core 3 which is formed by stacking nearly U-shaped yokes and a coil 4 wound around the iron core 3, and a Hall element. In an inner face of a hanger block 7, a controller 11 to supply power to the coil 4 of the stator block B is installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic door linear motor used as a power source for opening and closing an automatic door.

[0002]

2. Description of the Related Art A conventional automatic door engine has a structure in which the door is driven by a rotary motor and a belt.
However, since parts such as a speed reducer and a belt are required, there is a problem that the structure is complicated and miniaturization is difficult. For this reason, recently, a linear motor is used to open and close the door. A moving coil brushless motor (non-commutator motor) is used as this linear motor, and the Hall element detects a change in the magnetic pole on the stator side and switches the energization to the coil on the mover side.

[0003]

However, in the case of a moving coil type brushless motor, power is supplied to the motor through a lead wire connected to the coil.
There is no choice but to have a structure for expanding and contracting the lead wire for power supply when the mover connected to the door is opened and closed. Therefore, there is a problem that the lead wire is broken or the wiring of the lead wire becomes complicated.

The present invention has been made in view of the above circumstances, and an object thereof is to simplify the structure of a linear motor and a connecting portion between a linear motor and a door, downsize an engine portion, and An object of the present invention is to provide a linear motor for an automatic door that does not cause breakage of a lead wire due to operation of a mover.

[0005]

In order to achieve the above-mentioned object, a first aspect of the present invention is to provide permanent magnets magnetized with different poles in the thickness direction in the same direction at regular intervals along the longitudinal direction. Of the movable element block arranged so that their polarities are alternately different from each other, and each side piece of the substantially U-shaped iron core having both side pieces facing the magnetic pole surface of the permanent magnet, the coil is wound in reverse winding on each side piece. Hall element for discriminating the magnetic pole of the mover along with the movement of the electromagnet part and the mover block, which are formed by arranging a plurality of electromagnets in a row in the longitudinal direction so as to face the magnetic pole surface of the permanent magnet, and the hall element. A stator block having a power supply unit for alternately applying positive and negative voltages to the coils of the electromagnets based on the determination result, an engine case for mounting and fixing the stator block downward, and a door. Together with hanging Characterized in that it comprises a hanger blocks sent down suspended freely travel in the longitudinal direction of the engine case is attached upward the slider blocks.

According to a second aspect of the present invention, the mover block includes two permanent magnets arranged, and each permanent magnet has a tip end surface of both side pieces of the iron core of each electromagnet and a magnetized surface on the upper surface of the permanent magnet. And is mounted on the hanger block facing each other. According to a third aspect of the present invention, the engine case integrally has two protrusion-shaped locking portions for locking and fixing both ends of the base portion of the stator block formed of resin, and each of the protrusion-shaped engagement portions. It is characterized in that a taper surface which is inclined upward inward is provided at a tip portion of the stop portion.

According to a fourth aspect of the present invention, a recess is provided in the base portion of the stator block, and the Hall element block is mounted in the recess. A fifth aspect of the present invention is characterized in that the engine case integrally has a protrusion-shaped engaging portion that sandwiches the stator block so as to cover both side surfaces of the stator block.

The invention of claim 6 is characterized in that a pair of protrusions parallel to the longitudinal direction of the hanger block are provided on the upper surface of the hanger block, and the permanent magnet of the mover block is sandwiched between the protrusions.

[0009]

According to the structure of the first aspect of the present invention, since the mover block made of the permanent magnet moves along the stator block made of the electromagnet, the lead wire for supplying power to the mover becomes unnecessary. It is possible to eliminate the disconnection of the lead wire that has occurred due to repeated expansion and contraction of the lead wire.

According to the structure of the second aspect of the present invention, the mover block includes two permanent magnets arranged, and each of the permanent magnets is formed on the tip end surface of both side pieces of the iron core of each electromagnet and the upper surface of the permanent magnet. Since it is attached to the hanger block so as to face the magnetized surface, it is possible to increase the lateral width of each permanent magnet and to suppress the friction between each permanent magnet and the iron core even if there is vibration such as rolling.

According to the structure of the third aspect of the present invention, the engine case integrally has two projecting locking portions for locking both ends of the base portion of the stator block formed of resin, Since a taper surface that slopes inward is provided at the tip of each of the protruding locking portions, the stator block can be pushed into the protruding locking portion of the engine case, and Easy to install.

According to the structure of the invention of claim 4, since the recess is provided in the base portion of the stator block to mount the Hall element block, the Hall element block is accurately positioned and attached to the base portion of the stator block. You can According to the structure of the invention of claim 5, since the engine case integrally has the projecting locking portions for sandwiching and sandwiching the stator block so as to cover both side surfaces of the stator block, the stator block is The separate member for fixing can be reduced. Further, since the mover block part is covered with a part of the engine case, it is possible to prevent iron scraps and dust from adhering to the mover block.

According to the structure of the sixth aspect of the present invention, a pair of protrusions parallel to the longitudinal direction of the hanger block are provided on the upper surface of the hanger block, and the permanent magnet of the mover block is sandwiched between the protrusions. The permanent magnet of the mover block can be attached to the hanger block without using a separate member.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The linear motor of the present embodiment is a movable magnet type, and the structure is such that the mover block A made up of the permanent magnets 1 moves along the stator block B composed of the electromagnet portions in which a plurality of electromagnets 14 are arranged in the longitudinal direction. It has become.

The mover block A is, as shown in FIG.
The hanger block 7 has an inverted L-shaped cross section, and the permanent magnets 1 are arranged in a row over the entire length of the center of the horizontal piece 7a of the hanger block 7. As shown in FIG. 3, the permanent magnet 1 is magnetized to have different poles in the thickness direction (width direction), and the polarities of the magnetic pole surfaces adjacent to each other at regular intervals in the longitudinal direction of the permanent magnet 1 are alternately different. It is arranged as follows. The permanent magnet 1 is formed by adhering and fixing it to the upper surface of the hanger block 7, or by extruding a part of the horizontal piece 7a of the hanger block 7 as shown in FIG. It is fixed to the lateral piece 7a of the hanger block 7 by being press-fitted or crimped between the protrusions 101. It should be noted that the length of each pair of the permanent magnets 1 adjacent to each other in the longitudinal direction of the permanent magnet 1 is shown in FIG.
As shown in FIG. By the way, as shown in FIG. 1, the door 10 is attached to the lower end of the vertical piece 7b of the hanger block 7. Further, a pulley 12 is attached to the vertical piece 7b of the hanger block 7,
The pulley 12 is configured to move along a guide rail 8b formed of a protrusion integrally provided on the bottom of the engine case 8. Therefore, the door 10 is the mover block A.
Since it is interlocked with, it can be opened and closed through the hanger block 7 and the pulley 12.

As shown in FIG. 1, the stator block B has a stator base 2 having an inverted convex structure, an iron core 3 formed by laminating a substantially U-shaped yoke, and both side pieces of the iron core 3. It has an electromagnet 14 composed of a turned coil 4 and a hall element 5, and as shown in FIG. 4, three iron cores 3 (iron cores 3a, 3b, 3c) are combined with a stator base 2 and The coils 4a, 4b, 4c are wound around the iron core, and the coils 4a, 4b,
One basic unit 41 is configured by providing Hall elements 5a, 5b, 5c adjacent to 4c by a method described later. Here, the stator block B
The electromagnets 14 are provided at intervals of length L / 3 in the longitudinal direction as shown in FIG. Further, a controller 11 for supplying power to the coil 4 of the stator block B is attached to the inner surface of the hanger block 7. Here, a voltage source 51 described later is connected to the controller 11.

The stator base 2 is made of resin and is shown in FIG.
As shown in (b), a concave portion 20 and a projecting resin case supporting portion 13b are provided in a part of the stator base 2,
As shown in FIG. 6A, the Hall element 5 is fitted into the recess 20 of the stator base so that the Hall element 5 is sandwiched between the resin case supporting portion 13b and the resin case 13a. The discriminating circuit 52 including the wound coils 4a, 4b, 4c and the Hall elements 5a, 5b, 5c is
They are connected so as to form the circuit block shown in FIG.

As shown in FIG. 4, three Hall elements 5 and three resin cases 13 are installed on the stator base 2 in the basic unit 41, and the electromagnet 14 of the stator block B and the electromagnet 14 in the basic unit 41 are installed. The magnetic pole of the permanent magnet 1 of the mover block A facing each other is determined by the hall element 5.
As shown in FIG. 5, the detection result of the hall element 5 is input to the determination circuit 52, the determination result of the determination circuit 52 is input to the controller 11, and the distribution circuit 53 connected to the controller 11 is supplied with a signal from the controller 11. Permanent magnet 1 among 3 phase coils (4a, 4b, 4c)
The phases to be excited are switched by passing currents through the two-phase coils that are determined according to the magnetic poles.

Further, as shown in FIG. 1, the engine case 8 is integrally provided with a projecting locking portion 9 extending downward from the engine case 8 and extending inward at the lower end side. The stator base 2 is inserted by sliding from the outside in the direction, and both ends of the stator base 2 are locked and fixed. As shown in FIG. 1, the iron core 3 has anti-leg pieces 3-1 and 3-.
It is formed by laminating a substantially U-shaped yoke made of 2 and is fitted and fixed to the stator base 2. Therefore, the pair of leg pieces 3-1 and 3-2 of the iron core 3 are opposed to the magnetic pole surfaces on both sides of the permanent magnet 1 of the mover block A with a predetermined gap.

By adopting the above-described structure in this linear motor, a current is always applied to at least any two-phase coils of the three-phase coils of the stator block B, and the magnetomotive force generated at that time causes a constant current to flow in a certain direction. The propulsion force is obtained and the mover block A is propelled. When the mover block A is propelled in the reverse direction, the positive and negative sides of the power supply to the three-phase coils may be reversed.

The permanent magnet 1 is attached to the vertical piece 7b of the hanger block 7 in conjunction with the movement of the permanent magnet 1 when the permanent magnet 1 of the mover block A is attracted and repelled by the electromagnet 14 of the stator block B. The opened door 10 repeats the opening / closing operation. Further, as shown in FIG. 7 (or FIG. 9), the two permanent magnets 1a and 1b in which the mover block A is arranged are arranged.
The permanent magnets 1a and 1b are provided such that the magnetic poles of the magnetized surfaces facing the tip surfaces of the pair of leg pieces 3-1 and 3-2 of the iron core 3 of the electromagnet 14 of the stator block B are opposite to each other. If so, a magnetic circuit as shown in FIG. 8 is formed. In the configuration shown in FIG. 8, the pair of leg pieces 3-of the iron core 3 of the electromagnet 14
The mover block A is moved by the repulsion and attraction of the tip surfaces of 1 and 3-2 and the magnetic pole surfaces of the upper surfaces of the permanent magnets 1a and 1b. Further, in the configuration of FIG. 7 (or FIG. 8), it is possible to increase the lateral width of the permanent magnet 1 or suppress the friction between the permanent magnet 1 and the iron core 3 even when there is vibration of rolling.

FIG. 10 shows a projecting locking portion 9 for sandwiching and sandwiching the stator block B so as to cover both side surfaces of the stator block B. The locking portion 9 covers the mover block A by a part of the engine case 8, so that iron scraps and dust can be prevented from adhering to the permanent magnet 1. Further, as shown in FIG. 11, the engine case 8 is integrally provided with a tapered surface 9a that is inclined upward at the tip of a projecting locking portion 9 that extends downward from the bottom surface of the upper portion of the engine case 8 and extends inward at the lower end side. Further, by integrally providing a tapered surface 2a that is inclined downward to the outside on one side of the stator base 2, the stator base 2 is pushed up and can be attached to the upper bottom surface of the engine case 8 with one touch.

The operation of the linear motor will be described below. In FIG. 4, for example, when power is supplied to the coil 4a, a current flows through the coil 4a. Here, the coil 4a is wound around the side piece of the iron core 3 by reverse winding. Therefore, when a clockwise current is applied to the winding part of the iron core 3 around the counter leg 3-1 in FIG. 1, a counterclockwise current is applied to the winding part around the other leg 3-2. Flowing. By the way, when a clockwise current is passed through the winding portion, the opposite leg of the iron core 3 around which the winding portion is wound becomes the N pole on the surface facing the side surface of the permanent magnet 1, and the other winding is wound. A counterclockwise electric current flows through the portion, and the surface of the counter leg piece of the iron core 3 around which the winding portion is wound faces the side surface of the permanent magnet 1 becomes the S pole. Each electromagnet 14a, 14b, 14c is shown in FIG.
3 (a), the distribution circuit 53 causes a current to flow through the coils 4a and 4c, and the coils 4a and 4c
The polarities of the opposing surfaces of the pair of leg pieces of the iron core 3 wound with are opposed to the permanent magnet 1 are set to the state shown in FIG. Therefore, a repulsive force is generated between the iron core 3 and the permanent magnet 1 of the mover block A facing the iron core 3, and an attractive force is generated between the iron core 3 and the different pole surface of the adjacent permanent magnet 1.
Propulsive force in the leftward direction in FIG. 13A is generated in the mover block A).

Next, with this propulsion force, the permanent magnet 1 (that is,
When the mover block A) moves to the position shown in FIG. 13B, a current flows in the coils 4b and 4c by the distribution circuit 53, and the iron cores 3b and 3c around which the coils 4b and 4c are wound are wound. The polarities of the opposing faces of the pair of leg pieces to the permanent magnet 1 are set to the state shown in FIG. 13 (b). Therefore, as in the case described above, a repulsive force is generated between the facing surfaces of the iron cores 3b and 3c and the permanent magnet 1, and an attracting force is generated between the heteropolar surface shown on the right side in FIG. Propulsive force in the leftward direction in FIG. 13B is generated in the permanent magnet 1 (that is, the mover block A).

When power is supplied as described above, the polarities of the facing surfaces of the iron cores 3a to 3c are switched to the six states shown in FIG. 13, and in any case, the same principle as in the above case is continued. Will be propelled to the left. That is, the distribution circuit 53 that receives the signal from the controller 11 causes the three-phase coil 4a to
The permanent magnet 1 (that is, the mover block A) advances linearly by constantly passing a current through the two phases 4 c to 4 c. When the permanent magnet 1 (that is, the mover block A) is advanced to the right in FIG. 13, the coils 4a, 4
A voltage of opposite polarity may be applied to b.

[0026]

According to the invention of claim 1, since the mover block made of a permanent magnet moves along the stator block composed of electromagnets, a lead wire for supplying power to the mover becomes unnecessary, and the lead There is an effect that it is possible to eliminate the disconnection of the lead wire caused by the repeated expansion and contraction of the wire.

According to a second aspect of the present invention, the mover block includes two permanent magnets arranged, and each permanent magnet has a tip end surface of both side pieces of the iron core of each electromagnet and a magnetized surface of an upper surface of the permanent magnet. Since they are opposed to each other and are mounted on the hanger block, there is an effect that the lateral width of each permanent magnet can be increased and the friction between each permanent magnet and the iron core can be suppressed even if there is vibration such as rolling.

According to a third aspect of the present invention, the engine case integrally has two protrusion-shaped engaging portions for engaging both ends of the base portion of the stator block formed of resin, and each of the protrusion-shaped engaging portions. A tapered surface that rises inwardly is provided at the tip of the locking part, so the stator block can be pushed into the protruding locking part of the engine case, and the stator block can be easily attached to the engine case. There is an effect that.

According to the fourth aspect of the present invention, since the recess is provided in the base portion of the stator block and the Hall element block is mounted,
The Hall element block can be accurately positioned and attached to the base portion of the stator block. According to a fifth aspect of the present invention, the engine case integrally has projecting locking portions that sandwich and sandwich the stator block so as to cover both side surfaces of the stator block, so that the stator block is fixed. Another member can be reduced. Further, since the mover block part is covered with a part of the engine case, there is an effect that it is possible to prevent iron scraps and dust from adhering to the mover block.

According to the invention of claim 6, a pair of protrusions are provided on the upper surface of the hanger block in parallel with the longitudinal direction of the hanger block, and the permanent magnet of the mover block is sandwiched between the protrusions, so a separate member is used. There is an effect that the permanent magnet of the mover block can be attached to the hanger block without moving.

[Brief description of drawings]

FIG. 1 is a front view of a linear motor according to an embodiment of the present invention.

FIG. 2 is a right side view of the above.

FIG. 3 is a perspective view showing a structure of a main part of the above.

FIG. 4 is a perspective view showing a structure of a main part of the same.

FIG. 5 is an operation explanatory diagram of the above.

FIG. 6 (a) is a side view showing a structure of a main part of the same. (B) It is a perspective view which shows the structure of the principal part same as the above.

FIG. 7 is a front view showing a structure of a main part of the above.

FIG. 8 is a front view showing a structure of a main part of the above.

FIG. 9 is a right side view of the main part of the above.

FIG. 10 is a front view showing a structure of a main part of the above.

FIG. 11 is a front view showing a structure of a main part of the above.

FIG. 12 is a perspective view showing a structure of a main part of the above.

FIG. 13 is an operation explanatory diagram of the above.

[Explanation of symbols]

 1 Permanent Magnet 2 Stator Base 3 Iron Core 3-1 Pair of Legs 3-2 Pair of Legs 4 Coil 5 Hall Element 6 Hall Element Block 7 Hanger Block 8 Engine Case 8b Guide Rail 9 Protruding Locking Part 10 Door 11 Controller 12 Pulley 13a Resin case 14 Electromagnet A Mover block B Stator block

Front page continuation (72) Inventor Koji Matsukawa 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (6)

[Claims] 1. A mover block in which permanent magnets magnetized with different polarities in the thickness direction are arranged so that the polarities of magnetic pole faces in the same direction are alternately different at regular intervals along the longitudinal direction,
An electromagnet is wound around each side piece of a substantially U-shaped iron core having opposite side pieces facing the magnetic pole surface of the permanent magnet in reverse winding to wind a coil, and the both side pieces face the magnetic pole surface of the permanent magnet. A plurality of electromagnets arranged in a row in the column, and Hall elements for discriminating the magnetic poles of the mover along with the movement of the mover block, and the coils of the electromagnets alternately based on the discrimination result of the Hall elements. A stator block having a power supply unit for applying positive and negative voltages, an engine case for mounting and fixing the stator block downward, and a door for hanging and mounting the mover block upward for the engine case. A linear motor for an automatic door, comprising: a hanger block suspended so as to travel in a longitudinal direction. 2. The mover block includes two permanent magnets arranged, and each of the permanent magnets makes the end faces of both side pieces of the iron core of each electromagnet and the magnetized face of the upper surface of the permanent magnet face each other. The linear motor for an automatic door according to claim 1, wherein the linear motor is mounted on a block. 3. The engine case integrally has two projecting locking portions for locking and fixing both ends of a base portion of a stator block formed of resin, and each of the projecting locking portions. 2. The linear motor for an automatic door according to claim 1, wherein a taper surface that is inclined upward inward is provided at a tip portion of the linear motor. 4. The linear motor for an automatic door according to claim 1, wherein a concave portion is provided in the base portion of the stator block, and the hall element block is mounted in the concave portion. 5. The automatic engine according to claim 1, wherein the engine case integrally has a protrusion-like locking portion that sandwiches the stator block so as to cover both side surfaces of the stator block. Linear motor for doors. 6. The automatic machine according to claim 1, wherein a pair of protrusions parallel to the longitudinal direction of the hanger block are provided on the upper surface of the hanger block, and the permanent magnet of the mover block is sandwiched between the protrusions. Linear motor for doors.