JP2006254581A - Open/close driving method of sliding door and open/close unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear motor mechanism suitable for performing open/close driving of a sliding door 10 electromagnetically. <P>SOLUTION: An air core coil array is arranged alternately with first phase air-core coils 5a, 5b, 5c and second phase air-core coils 6a, 6b, 6c at pitch P while being shifted by P/2 and located at a lintel (not shown). On the other hand, a pole array 4 is arranged with poles (N, S) alternately at pitch P and secured to a sliding door (not shown). Movement of the sliding door is detected by means of a photosensor 8 or a magnetic sensor 9. An automatic control circuit 22 switches conducting direction of the air-core coil array depending on the movement of the sliding door. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technique for electrically opening and closing a sliding door, which is a fitting, and is improved particularly so as to be small and light and yet exhibit a driving force sufficient for practical use.

Various devices are known as this type of electric door drive device, but all of them are complicated and have large and heavy equipment. In particular, since a coil in which an insulated wire is wound around an iron core is used, the iron core increases the weight.
Special table 2003-529303 gazette Japanese Patent Laid-Open No. 2003-244928 JP-A-8-42249

  The present invention has been made in view of the circumstances described above, and an object of the present invention is to provide an electric technique for a sliding door that does not use an iron core coil and is small, light, and simple in structure.

The present invention uses a newly created linear motor as a drive source. FIG. 1 is a schematic plan view for explaining the operating principle.
For convenience of explanation, orthogonal three axes X, Y, and Z are assumed. The sliding door (10) is located below the magnetic pole row 4 and is coupled to the magnetic pole row 4. The sliding door is supported in parallel with the XZ plane and is opened and closed in the X-axis direction. Therefore, the electromagnetic driving force is generated in the X-axis direction.
As shown in FIG. 1A, a first-phase air-core coil 5a is provided above the magnetic pole row 4 and is fixed to a building (for example, Kamoi).

When a current Ca is applied to the first phase air-core coil 5a to generate magnetism as indicated by the supplementary notes S and N, an attractive force and a repulsive force act as indicated by “pull” and “push”, and the magnetic pole array 4 is moved to the left in the figure.
When the magnetic pole row 4 moves to the right by a half pitch (p / 2) and enters the state shown in FIG. 1B, no force in the X-axis direction acts on the magnetic pole row 4.
Therefore, as shown in FIG. 1 (C), the second phase air-core coil 6a is provided by being shifted from the first phase air-core coil 5a by a half pitch (p / 2), and the attractive force (attraction force) indicated in FIG. 1 (C) is provided. ), Repulsive force (push) is applied.

FIG. 1A shows two first-phase air-core coils 5a and 5b. In short, a plurality of first-phase air-core coils are arranged at a pitch p (or an integer multiple thereof) of the magnetic pole array. ) Is one of the requirements for achieving the object of the present invention.
As described above, arranging the first phase air-core coils 5a and 5b and the second phase air-core coils 6a and 6b at a half pitch apart is one of the requirements for achieving the object.

Further, when the state in which the magnetic pole row 4 moves to the right side of the figure and becomes as shown in FIG. 1D is compared with the above-mentioned figure (A),
It is similar that the first phase air-core coil 5a is located on the boundary between the N magnetic pole and the S magnetic pole.
However, the polarities of the opposing magnetic poles are opposite.
Therefore, energization is performed in the direction (Cc) opposite to the energization direction (Ca) in (A) to generate magnetism in the N and S directions indicated in (D), and the attractive force (attraction) indicated in (D), A repulsive force (push) must be applied. Thus, alternately reversing the energization direction is one of the requirements for achieving the object.

The inventive method according to claim 1 as a specific configuration based on the principle described above with reference to FIG.
(See FIG. 1) In the method of opening and closing the sliding door (10) electrically,
Assuming orthogonal three axes X, Y, and Z with the opening / closing direction of the sliding door as the X axis, the thickness direction of the sliding door as the Z axis, and the vertical direction as the Z axis,
A magnetic pole array (4) in which N poles and S poles are alternately arranged at a constant pitch p is installed in the X-axis direction on the sliding door,
On the other hand, a plurality of first-phase air-core coils (5a, 5b) are arranged in the X-axis direction with a spacing dimension p or an integer multiple thereof, and a plurality of second-phase air-core coils (6a, 6b) are spaced with a spacing dimension p. Or an integer multiple of them arranged in the X-axis direction, and the first-phase air-core coil and the second-phase air-core coil are biased by p / 2 in the X-axis direction to form a coil array,
(See FIG. 4) The coil array (13) is attached to a building (for example, Kamoi 19) so as to face the magnetic pole array (4),
(Refer to FIGS. 1 (A) and 1 (D)) While alternately reversing the DC energization direction to the first phase air-core coils (5a, 5b),
The direction of direct current application to the second phase air-core coils (6a, 6b) is alternately reversed with a phase difference of 1/4 cycle as compared with the first phase air-core coil.

The configuration of the inventive method according to claim 2 is in addition to the constituent features of the inventive method of claim 1 (see FIG. 2).
The timing of reversing the energization direction of the first phase air-core coils (5a, 5b, 5c) and the second phase air-core coils (6a, 6b, 6c)
Based on the detection signal obtained by reading the optical measure (7) attached to the sliding door with the optical sensor (8),
Alternatively, the magnetic pole row (4) is moved based on a detection signal read by the magnetic sensor (9).

The configuration of the inventive device according to claim 3 is as follows:
(See FIG. 3) In a device for electrically opening and closing the sliding door (10),
Assuming orthogonal three axes X, Y, Z with the opening / closing direction of the sliding door as the X axis, the thickness direction of the sliding door as the Y axis, and the vertical direction as the Z axis,
(See FIG. 1 and FIG. 2) A magnetic pole row (4) in which N poles and S poles are alternately arranged in the X-axis direction at a constant pitch p is installed in the sliding door,
A plurality of first phase air-core coils (5a, 5b) are arranged in the X-axis direction with a spacing dimension p or an integer multiple thereof, and a plurality of second-phase air core coils (6a, 6b) are spaced with a spacing dimension p or A coil array (reference numeral 13 in FIG. 3), which is an integer multiple and arranged in the X-axis direction, and the first-phase air-core coil and the second-phase air-core coil are offset by p / 2 in the X-axis direction, It is attached to the building and faces the magnetic pole row (4),
In addition, the direction of direct current flow to the first phase air-core coil is alternately reversed, and the direction of direct current flow to the second phase air-core coil is set to ¼ that of the first phase air-core coil. An automatic control circuit (22) for alternately inverting with a cycle phase difference is provided.

The configuration of the inventive device according to claim 4 is in addition to the configuration requirements of the inventive device of claim 3,
(See FIG. 2) An optical measure (7) that is attached to the sliding door and moves in the X-axis direction together with the magnetic pole row (4), and an optical sensor that reads the measure and detects the position of the magnetic pole row ( 8) and
Or a magnetic sensor (9) for detecting the position of the magnetic pole row in response to the magnetism of the magnetic pole row (4),
And the detection signal of the said optical sensor or the detection signal of the said magnetic sensor is input into an automatic control circuit (22), It is characterized by the above-mentioned.

The configuration of the inventive device according to claim 5 is in addition to the configuration requirements of the inventive device of claim 3 or claim 4,
(See FIG. 3) The magnetic pole array (4) and the door wheel (11) are connected by a connecting shaft (18) in the X-axis direction, and the electromagnetic driving force generated in the magnetic pole array is mainly transmitted through the connecting shaft. It is characterized by being given to the doorcar.

The configuration of the inventive device according to claim 6 is as follows:
(See FIG. 3) In a device for electrically opening and closing the sliding door (10),
A rail (12) and a doorwheel (11);
A magnetic pole array (4) in which N poles and S poles are alternately arranged in the X-axis direction at a constant pitch p;
A plurality of first-phase air-core coils are arranged at a spacing dimension p, a plurality of second-phase air-core coils are arranged at a spacing dimension p, and the first-phase air-core coil and the second-phase air-core coil are a coil array (13) biased by p / 2,
An existing construction is combined with an automatic control circuit (reference numeral 22 in FIG. 2) having a function of reversing the energizing directions of the first phase air core coil and the second phase air core coil in accordance with the movement of the magnetic pole row. It is characterized in that it constitutes an assembly part that can be attached to an object and / or joinery.

The configuration of the inventive device according to claim 7 is in addition to the configuration requirements of the inventive device of claim 6,
(See FIG. 2) The optical sensor (8) that reads the movement of the measure (7) assembled to the magnetic pole row and outputs an electrical signal to the assembled component (b), or (b) A magnetic sensor (9) that is sensitive to magnetism, reads the movement of the magnetic pole row, and outputs an electrical signal is added.

According to the first aspect of the invention, the sliding door can be driven to open and close using a small, light and simple member.
In addition, since high-precision control is not required, an inexpensive control means is sufficient, and there is no possibility of causing a trouble due to a control error, and the operation reliability is high.
Furthermore, since it is not necessary to energize the movable member, the wiring mechanism is simple, and there is no possibility of causing electrical accidents such as poor contact or electric leakage, which is safe.
Moreover, since it can be applied to existing buildings and joinery, the range of application is wide.

  According to the second aspect of the invention, the movement of the movable part can be detected by the optical sensor or the magnetic sensor, and the energization of the air-core coil can be switched and controlled. There is no need to use mechanically actuated electrical contacts. For this reason, there is no possibility that troubles such as contact burnout and contact failure occur, and the operation reliability is high.

When the invention device of claim 3 is applied, the member that generates the opening / closing driving force by the electromagnetic force is small and lightweight, and particularly thin and narrow, and therefore, it is suitable for installation between a building and a fitting.
Moreover, the structure is simple. Due to the simple structure, not only is the manufacturing easy and the manufacturing cost is low, but the operation is reliable and the durability is excellent.
Further, the portion that needs to be energized is composed of a fixed member, and the movable member does not need to be energized. For this reason, the energization mechanism is simple, and there is no possibility of causing troubles in electrical parts such as poor contact and burnout.
In addition, since the electrical control is simple and does not require high accuracy, the operation reliability is high and maintenance is free.

According to the fourth aspect of the present invention, since the movement of the magnetic pole array fixed to the sliding door is detected by the optical sensor or the magnetic sensor, it is not necessary to provide a mechanically operated contact switch or the like, and an error in the mechanically operated part is detected. Troubles such as operation and wear do not occur, and operation noise is not generated.
Furthermore, there is no hysteresis (error between the ON point and the OFF point) peculiar to the limit switch provided with the electrical contact.

According to the fifth aspect of the invention, since the magnetic pole row and the door wheel are connected via the connecting shaft, the driving force in the X-axis direction generated in the magnetic pole row is transmitted to the door wheel. For this reason, an excessive force is not applied to the attachment part of the magnetic pole row and the sliding door, and a smooth opening / closing operation can be performed.
Since it is the above structures, when carrying out the invention of claim 5, the sliding door and the door cart use commercially available off-the-shelf products, and the magnetic pole row is attached to the door wheel via the connecting shaft according to the present invention. Thus, the device of the present invention can be manufactured quickly and easily.

The invention apparatus of claim 6 is effective for industrialization and widespread use of the present invention since the structural members necessary for carrying out the method of the present invention are assembled as an assembly.
That is, from the viewpoint of the producer, the business can be expanded and developed by mass-producing and supplying the parts indispensable for the implementation of the present invention with high quality and low cost.
From the user's perspective, the benefits of the present invention can be enjoyed by purchasing a high-performance opening / closing drive device at a low cost and mounting it at a desired location.
As discussed above, the versatility of the present invention is remarkably expanded by applying the present claim 6 and supplying the components necessary for carrying out the method of the present invention as an assembly.
The device of the present invention was created for driving a sliding door, but the application range is not limited to words. That is, even if applied to other than sliding doors, it belongs to the technical scope of the present invention.

According to the seventh aspect of the present invention, it is possible to control the energization of the air-core coil by mounting a sensor device that outputs an electrical signal to a stationary member (for example, a stationary member such as a duck).
That is, since it is not necessary to provide a sensor on a movable member (for example, a driven member such as a sliding door), signal wiring is simple and easy. The simple and easy wiring not only lowers the operating cost, but also increases the operational reliability.
In addition, since the sensor used in the configuration of claim 7 operates optically or electromagnetically and does not have mechanically operated electrical contacts, there is a risk of causing problems such as contact failure or contact burnout. There is no.

FIG. 3 is a schematic front view of an embodiment in which the present invention is applied to opening and closing of a sliding door.
For convenience of explanation, coordinate axes X, Y, and Z are assumed as illustrated. The Z axis is the vertical direction, the X axis is the sliding door opening / closing operation direction, and the Y axis is orthogonal to the paper surface.
The rail 12 is fixed to a building such as Kamoi in the X-axis direction. A sliding door 10 has a door 11 attached thereto, which is guided by a rail and travels in the X-axis direction.
A slider 17 is attached to the sliding door 10, and the magnetic pole row 4 is installed in the X-axis direction on the slider. This magnetic pole row will be described in detail later with reference to FIG. A coil array 13 is fixed to the rail 12 and faces the magnetic pole array 4. The structure of this coil array will also be described in detail later with reference to FIGS.
In the present example, the sliding door is configured to open and close, but the application target of the present invention is not limited to the sliding door, and may be configured to drive an object other than the sliding door. The pair of the magnetic pole array and the coil array is an essential component of the present invention, and if the magnetic pole array and the coil array having the configuration according to the present invention are provided, the present invention is not necessarily required without using a sliding door or a door wheel. It is equivalent to the invention.

FIG. 1 is a schematic diagram for explaining the principle of the present invention. The first permanent magnet Ma, the second permanent magnet Mb, the third permanent magnet Mc, the fourth permanent magnet Md... Are arranged in the X-axis direction to form the magnetic pole row 4.
The plurality of permanent magnets Ma to Md are arranged at a constant pitch p, and adjacent permanent magnets are alternately reversed in polarity.
The coil array 13 described above with reference to FIG. 3 includes first phase air-core coils 5a, 5b... And second phase air-core coils 6a, b. The configuration and operation of these air-core coils will be sequentially described below with reference to FIGS. 1 (A) to 1 (D).

1A: The first phase air-core coils 5a and 5b are stationary members, and the magnetic pole row 4 moves in the X-axis direction. Consider the state where the boundary between the permanent magnet Ma and the permanent magnet Mb faces the first phase air-core coil 5a as shown in FIG.
When a current (arrow Ca) is energized to the first phase air-core coil 5a to generate magnetism as indicated by N and S,
The permanent magnet Ma is pulled diagonally to the right as shown by the arrow “pull”, and the permanent magnet Mc is pushed diagonally to the right as shown by the arrow “push”. Driven towards.

When the magnetic pole row 4 fixed to the sliding door 10 moves to the right and the permanent magnet Mb comes directly under the first phase air-core coil 5a as shown in FIG. The repulsive force (in this case, attractive force) works, and the driving force in the X-axis direction disappears.
As understood by comparing FIGS. 1A and 1B, if the air-core coil is not positioned on the boundary between the two permanent magnets, the driving force in the X-axis direction is not generated.
Therefore, a second phase air-core coil 6a is provided at a half pitch (p / 2) from the first phase air-core coil 5a as shown in FIG. By generating a repulsive force, the magnetic pole row 4 is further driven rightward.

As can be understood by comparing FIGS. 1A and 1B described above, energization to the first phase air-core coil 5a (arrow Ca) and energization to the second-phase air-core coil 6a (arrow Cb). ) Is given a time difference. This time difference is a half pitch (p / 2) when converted to a distance in the X-axis direction. Further, as will be described later with reference to FIG.
(C) From the state shown in the figure, when the magnetic pole row 4 is moved to the right by p / 2 by the action of the second phase air-core coil 6a, as shown in FIG. (D), the second-phase air-core coil 6a The driving force disappears.
At this time, since the first phase air-core coil 5a is located above the magnetic pole boundary, the drive of the magnetic pole row 4 is continued by energizing the first phase air-core coil 5a.
However, as is clear by comparing FIGS. 1A and 1D, the polarity of the magnetic pole boundary where the first-phase air-core coil 5a faces is changed. For this reason, in the state of (D) figure, it has to energize in the direction of arrow Cc contrary to the figure in (A) figure.

Two permanent magnets (for example, Mb and Mc) are arranged apart by a pitch p. Therefore, the energization direction for the air-core coil is reversed every time the magnetic pole row moves by the dimension p.
That is, the pitch dimension p corresponds to a half cycle of rectangular wave alternating current. That is, one cycle corresponds to two pitches.
See FIG. 1A: The two first-phase air-core coils 5a and 5b are arranged at a pitch of 2 in this example.
Although it is possible to arrange them one pitch apart, it is a necessary condition that the interval dimension is an integral multiple of the magnetic pole pitch dimension (p).

In the same manner that the plurality of first phase air-core coils 5a, 5b,... Are arranged with a spacing dimension p or an integer multiple thereof, the plurality of second phase air-core coils 6a, 6b. Arranged.
The first phase air-core coils 5a and 5b and the plurality of second phase air-core coils 6a and 6b are arranged so as to be shifted from each other by a half pitch (p / 2).
The plurality of first phase air-core coils 5a and 5b reverse the energization direction in accordance with the movement of the magnetic pole row 4, and the plurality of second phase air-core coils 6a and 6b with a phase difference of 1/4 cycle. Reverse the energizing direction.

As described above, in order to switch the energization of the air-core coil in accordance with the movement of the magnetic pole row 4, the movement of the magnetic pole row must be detected.
FIG. 2 is a schematic system diagram for explaining a mechanism for detecting the position of the magnetic pole row.
The magnetic pole row 4 is fixed to the sliding door (not shown) as described above. An optical measure 7 is fixedly attached to the sliding door. Mechanically, the position of the optical measure 7 is fixed with respect to the magnetic pole row 4. When the magnetic pole row moves with the sliding door, the measure 7 moves with it. That is, the measure is a member on the moving side.
The optical sensor 8 is installed on a fixed member (for example, a rail that is a stationary member, or a building or stationary fixture such as a duck, etc.) facing the measure 7.

As can be easily understood from the structural function described above with reference to FIG. 1, the timing of switching the energization of the air-core coil in the present invention does not require such high accuracy as to compete for microseconds. For this reason, the resolution of the optical sensor 8 does not require precision in micron units. Therefore, a relatively inexpensive device is sufficient.
As an embodiment different from the above, it is also recommended to provide a magnetic sensor (for example, a Hall element) 9 facing the magnetic pole row 4. In this case, it is not necessary to provide an optical measure, and the magnetic sensor 9 senses the magnetic flux of the magnetic pole row 4 and outputs an electrical signal indicating the position of the magnetic pole row.

The output signal of the optical sensor 8 or the output signal of the magnetic sensor 9 is input to the automatic control circuit 22. The automatic control circuit calculates the position of the magnetic pole row 4 and energizes the first phase air-core coils 5a, 5b, 5c and the second phase air-core coils 6a, 6b, 6c based on the command of the operation switch 23. And the magnetic pole row 4 is driven to reciprocate in the X-axis direction.
In the example of FIG. 2, the scale of the optical measure 7 is 6 per pitch. However, when the present invention is implemented, the scale size of the measure 7 can be arbitrarily set. In this embodiment, the pitch dimension is 30 millimeters and the scale is 5 millimeters. In any case, it is one of the advantages of the present invention that such a relatively rough control accuracy is sufficient.

4A and 4B are schematic views showing a substantial structure. FIG. 4A corresponds to the AA cross section of FIG. 3, and FIG. 4B corresponds to the BB cross section of FIG.
In the cross section of (A), a door wheel 11 is attached to the upper edge of the sliding door 10, and the door wheel is supported and guided by a rail 12.
The rail is fixed to the Kamoi 19.
In the cross section of (B), the magnetic pole row 4 is installed via the slider 17 with respect to the sliding door 10. Reference numeral 21 denotes a back yoke. Providing the back yoke increases the magnetic flux density of the magnetic pole row 4 and increases the driving force.

  In the cross section of (B), air-core coils 5 and 6 are fixed to the ceiling wall of the rail 12 via the coil plate 20. The coil plate can be made of a non-magnetic material such as a synthetic resin, or can be made of a ferromagnetic material such as an electric iron plate.

Among the components shown in FIG. 4, the head 19 can be replaced with another stationary member, and the sliding door 10 can be replaced with another movable member.
Among the components shown in FIG. 4, members other than Kamoi 19 and sliding door 10, that is, rail 12, air-core coils 5 and 6, magnetic pole array 4, slider 17, and door pulley 11 are used as an assembly (assembled part). Once produced and supplied, the user can quickly and easily put the present invention into practical use by purchasing this assembly and mounting it on the desired furniture and fittings (the user in this case is the end user) Including all contractors). Such an embodiment corresponds to claim 6 of the present invention. In this case, the technical scope of the present invention should not be interpreted in a limited manner by the phrase “sliding door”.

Schematic diagram for explaining the principle of the present invention Control system diagram in one embodiment of the present invention Schematic XZ sectional view in one embodiment of the present invention Schematic YZ sectional view in one embodiment of the present invention

Explanation of symbols

4 ... Magnetic pole array 5 ... First phase air-core coil 6 ... Second phase air-core coil 7 ... Major 8 ... Optical sensor 9 ... Magnetic sensor 10 ... Sliding door 12 ... Rail
13 ... Coil array
17 ... Connecting shaft
18 ... Connecting shaft
19 ... Kamoi
20 ... Coil plate
21 ... Back yoke
22 ... Automatic control circuit
23 ... Operation switch

Claims (7)

In the method of opening and closing the sliding doors electrically,
Assuming orthogonal three axes X, Y, and Z with the opening / closing direction of the sliding door as the X axis, the thickness direction of the sliding door as the Z axis, and the vertical direction as the Z axis,
In the above sliding door, a magnetic pole array in which N poles and S poles are alternately arranged at a constant pitch p is installed in the X-axis direction,
On the other hand, a plurality of first-phase air-core coils are arranged in the X-axis direction with a spacing dimension p or an integer multiple thereof, and a plurality of second-phase air-core coils are arranged in the X-axis direction with a spacing dimension p or an integer multiple thereof. And the first phase air-core coil and the second phase air-core coil are biased by p / 2 in the X-axis direction to form a coil array,
Attach the above coil row to the building, facing the magnetic pole row,
Alternately reversing the direction of direct current to the first phase air-core coil,
A sliding door opening / closing drive method, wherein the direction of direct current application to the second phase air-core coil is alternately reversed with a phase difference of 1/4 cycle as compared with the first phase air-core coil. The timing for reversing the energization direction of the first phase air-core coil and the second phase air-core coil is as follows:
Based on the detection signal read by the optical sensor optical measure attached to the sliding door,
2. The sliding door opening / closing driving method according to claim 1, wherein the magnetic pole row is moved based on a detection signal read by a magnetic sensor. In the device that electrically opens and closes the sliding door,
Assuming orthogonal three axes X, Y, Z with the opening / closing direction of the sliding door as the X axis, the thickness direction of the sliding door as the Y axis, and the vertical direction as the Z axis,
A magnetic pole array in which N poles and S poles are alternately arranged in the X-axis direction at a constant pitch p is installed in the sliding door,
A plurality of first-phase air-core coils are arranged in the X-axis direction with a spacing dimension p or an integer multiple thereof, and a plurality of second-phase air-core coils are arranged in the X-axis direction with a spacing dimension p or an integer multiple thereof, A coil array formed by biasing the first-phase air-core coil and the second-phase air-core coil by p / 2 in the X-axis direction is attached to the building and faces the magnetic pole array,
In addition, the direction of direct current flow to the first phase air-core coil is alternately reversed, and the direction of direct current flow to the second phase air-core coil is set to ¼ that of the first phase air-core coil. A sliding door opening / closing drive device, characterized in that an automatic control circuit for alternately inverting the phase with a cycle phase difference is provided. An optical measure attached to the sliding door and moving in the X-axis direction together with the magnetic pole row; and an optical sensor for detecting the position of the magnetic pole row by reading the measure.
Or a magnetic sensor that detects the position of the magnetic pole row in response to the magnetism of the magnetic pole row,
4. The sliding door opening / closing drive device according to claim 3, wherein a detection signal of the optical sensor or a detection signal of the magnetic sensor is input to the automatic control circuit.   The magnetic pole row and the door wheel are connected by a connecting shaft in the X-axis direction, and an electromagnetic driving force generated in the magnetic pole row is mainly applied to the door wheel through the connecting shaft. The sliding door opening and closing drive device according to claim 3 or 4. In the device that electrically opens and closes the sliding door,
With rails and doors,
A magnetic pole array in which N poles and S poles are alternately arranged in the X-axis direction at a constant pitch p;
A plurality of first phase air-core coils are arranged at a spacing dimension p or an integer multiple thereof, and a plurality of second phase air-core coils are arranged at a spacing dimension p or an integer multiple thereof, A coil array formed by biasing the second phase air-core coil by p / 2,
Attached to an existing building and / or joinery in combination with an automatic control circuit having a function of reversing the energizing directions of the first phase air core coil and the second phase air core coil in accordance with the movement of the magnetic pole row A sliding door opening and closing drive device, characterized in that the sliding door is formed of a pair of parts that can be operated.   (B) an optical sensor that reads the movement of a measure assembled to the magnetic pole row and outputs an electrical signal; or (b) the movement of the magnetic pole row in response to the magnetism of the magnetic pole row. 7. A sliding door opening / closing drive device according to claim 6, further comprising a magnetic sensor that reads an electric signal and outputs an electrical signal.

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