JPH03244777A - Magnetic levitation self-running type suspension sliding door - Google Patents

Abstract

PURPOSE:To prevent the generation of noise and raising dust by attracting a door body to a yoke rail by means of electromagnets located to the two ends of the upper part of the door body to cause magnetic levitation thereof, and energizing a linear motor coil for travelling movement. CONSTITUTION:A door body 1 is attracted to a yoke rail 3, mounted on a support lever 2, by means of electromagnets 10 and 10 located to the two ends of the upper part thereof to cause magnetic levitation thereof. In this case, control is effected by means of a gap sensor 16 so that a separating distance between the electromagnets 10 and 10 and the yoke rail 3 is always kept at a specified value. A liner motor coil 17 is charged with a control current for travelling movement, and the door body 1 is travelled for movement in a given direction. This constitution suppresses an energizing current to a low value and reduces capacity and a quantity of a control switch.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a magnetically levitated suspension sliding door that can travel along a guide rail without contact.

[Prior Art] Conventional self-propelled sliding doors are freely suspended from suspension rails fixed to the ceiling, etc. via suspension rollers provided at the top of the door body, and are suspended from tension rails, chains, etc. Through means, the door body is driven by an electric motor.

Furthermore, as disclosed in Japanese Utility Model Application Publication No. 1-105180, a permanent magnet may be fixed to the upper end of the door body to attract the door body to the suspension rail, thereby reducing the suspension load applied to the suspension roller. It is publicly known.

[Problems to be Solved by the Invention] Even if a permanent magnet is provided at the upper end of the door body and the door body is attracted to the suspension rail, the rollers that move along the suspension rail will not completely float.

If the permanent magnet is made strong enough to cause the roller to float above the suspension rail, either the permanent magnet or the suspension rail will stick to it.

When the roller rotates while supporting the load of the door body, friction occurs at the roller's rotating shaft and the contact area between the roller and the suspension rail.

Furthermore, in conventional self-propelled sliding doors, vibration and scraping noises are generated from transmission parts such as drive motors, cables, chains, etc., and dust generation from frictional parts cannot be avoided.

Therefore, it has been difficult to use conventional self-propelled sliding doors in places where noise and dust are averse, such as hospitals and clean rooms.

Furthermore, with conventional devices powered by an electric motor, there is a problem that the sliding door cannot be opened or closed unless the electric motor is disconnected from the transmission mechanism in the event of a power outage or the like.

[Means for Solving the Problems] The present invention provides a yoke rail for a linear motor in which a large number of linear motor coils are embedded in the longitudinal direction, a door body that is located below the yoke rail and moves along the yoke rail, A horizontal support rod is fixed to the house structure and supports the yoke rail, and a linear motor is provided at the top of the door body and faces the bottom surface of the rail, working together with the coils of the yoke rail to act as a linear motor. It is installed between a working permanent magnet, a yoke rail or equivalent stationary body, and the door body, and detects the relative position of the yoke rail and the door body, and selects and controls the drive coil of the linear motor coil according to that relative position. a position detection means provided near both ends of the upper part of the door body in the direction of movement, and an electromagnet that attracts the yoke rail; The above-mentioned problem is solved by providing a gap sensor that detects the gap between the two.

[Function] The door body is controlled to have a constant separation distance by a gap sensor using electromagnets installed at both ends of the upper part, and is attracted to the yoke rail and magnetically levitates, and in this magnetically levitated state,
By passing a control current for running movement through the linear motor coil, it can be moved in a desired direction.

When the linear motor section, which is made up of a permanent magnet and a linear motor coil, operates, an attractive force acts between the yoke rail and the permanent magnet, but the magnitude and fluctuations of this attractive force are determined by the gap between the gap-controlled attraction section using the electromagnet and the gap sensor. Reflected in the sensor gap, mutual interference is automatically absorbed.

The two types of magnetic attraction means do not interfere with each other, and the linear motor section and the gap control type attraction section act complementary to each other so as to compensate for the shortcomings of the other.

[Example] (1) is a door body in a sliding door that opens and closes a passageway such as an entrance/exit of a room or a hallway.

(2) is a horizontal support rod with a square cross section that is fixed to a structure (A) such as a hallway or a ceiling of a room above the door body (1).

(3) is a yoke rail for a linear motor fixed to the lower surface (4) of the support rod (2). (5) is a pair of cross-sectional left and right suspension rails that suspend and support the door body (1) when the magnetic levitation of the door body (1) is stopped; Center piece (6) of rod (2)
is fixed to the side of the

A horizontal bar (8) having a length approximately equal to the width of the door is fixed to the upper end of the door body (1), and a pair of permanent magnets (9) ( 9) are installed at the required intervals.

Electromagnets (1
0) is fixed.

On the outside of each electromagnet (10), the upper surface of the horizontal beam (8) is configured to ride on the upper end of an upward convex portion (11) formed at the tip of the horizontal piece of the suspension rail (5). The lower end of the support piece (13) that supports the roller (12) at the upper end is fixed.

In addition, at both ends of the horizontal bar (8), electromagnets (10
) upper surface (14) and lower surface (15) of the yoke rail (3)
A gap sensor (16) is provided to control the gap between the two.

Gap sensor (16) and yoke rail (3)
so that the gap between the bottom surface (15) and the bottom surface (15) is always kept constant.
The currents of the electromagnets (10) corresponding to the left and right ends are controlled, and in this controlled state, the roller (10)
2), the upward convex portion (11) of the suspension rail (5) is removed upwardly, and the door body (1) floats in a non-contact state.

Each permanent magnet (9) and the yoke rail (
3) Linear motor coil (17) embedded in the bottom surface
A linear motor is constructed by these.

The linear motor coil (17) has a pitch (P) between magnetic poles of a permanent magnet (9) polarized in the moving direction of the door body (1).
In between, the required number (N) of coils (17) are connected to P/
(2N) groove width, one coil (17) forming one loop is inserted into two slots (18) with P/2 pitch between each other.
8), and between one pitch (P) between magnetic poles, N coils (17) are embedded by sequentially extending one pitch (P/2N) of slots (18).

This embedding of the linear motor coil (17) is repeated in the same structure for each magnetic pole pitch (P).

A pair of permanent magnets (9) that cooperate with the linear motor coil (17) are provided at intervals of an integral multiple of P/2, which is half the pitch (P) between magnetic poles.

The number of permanent magnets (9) may be one as long as the driving force in the running direction is sufficient, or three if the driving force is insufficient.
or more.

The moving direction of the door body (1) and the door position detection means (19)
) A current is sequentially applied to each slot (18) of the linear motor coil (17) depending on the position of the door body (1) obtained by the method.

The operating principle of the yoke rail (3) in which a permanent magnet (9) and a linear motor coil (17) are embedded is the same as that of a conventional linear motor.

The door position detection means (19) is composed of a non-contact linear encoder, such as Magnescale (registered trademark), provided between the structure (A) such as the ceiling and the door body (1). Note that (20) is a magnetic scale on the fixed side, and (21) is a head on the fixed side.

The door body (1) has electromagnets (1) installed at both ends of its upper part.
0) According to (10), the separation distance is controlled to be constant by the gap sensor (16), and the object is attracted to the yoke rail (3) fixed to the structure (A) such as the ceiling and magnetically levitates.

When a control current is applied to the linear motor coil (17) in this magnetically levitated state, the door body (1) is moved in a desired direction.

When the linear motor unit consisting of the permanent magnet (9) and the linear motor coil (17) operates, an attractive force is exerted between the yoke rail (3) and the permanent magnet (9), and the magnitude and fluctuation of this action are determined by the electromagnet ( 10) and the gap sensor (16) of the gap control type suction section by the gap sensor (16), and mutual interference is automatically absorbed.

Therefore, although two types of magnetic attraction means are used in the present invention, they do not interfere with each other and their operation is stable.

Furthermore, the linear motor section and the gap-controlled suction section act in a complementary manner so as to compensate for the shortcomings of the other.

For example, each linear motor coil (17
) is controlled on/off by a large number of switching elements.

Therefore, according to the present invention, if the linear motor section generates an attractive force sufficient to magnetically levitate the door body (1), the coil current becomes large, causing problems with the capacity of the control switch, and Due to the large number of
The problem is that many large-capacity and expensive switches are required, which increases the price.Also, with only a gap-controlled suction unit, it is easy to generate the suction force that magnetically levitates the door body (1), but it moves the door body (1) in the left and right direction. The problem of not being able to exert force will be solved at the same time.

[Effect] The door body moves from side to side while magnetically levitated.
Does not generate noise such as vibration or scraping noise.

Since there are no mechanical abrasions due to the movement of the door body, no dust is generated.

When there is no power such as a power outage, it can be easily opened and closed manually as a normal roller-type suspension sliding door.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing an embodiment of the present invention, Fig. 2 is a front view of main parts of the embodiment of Fig. 1, and Fig. 3 is a view taken along the line ■-■ in Fig. 2. FIG. 4 shows IV- in FIG.
FIG. 5 is an enlarged longitudinal sectional view of the V section in FIG. 2. (13) Roller support (14) Top surface (15) Bottom surface
(16) Gap sensor (17) Coil
(18) Slot (19) Door position detection means (2
0) Magnetic scale (21) Head (1) Door body (3) Yoke rail (5) Suspension rail (7) Vertical piece (9) Permanent magnet (11) Convex part (2) Support rod (4) Bottom surface (6) Center piece (8) Horizontal bar (10) Electromagnet (12) Roller Figure 4

Claims (1)

[Claims] A yoke rail for a linear motor in which a large number of linear motor coils are embedded in the longitudinal direction, a door body located below the yoke rail and moving along the yoke rail, and a door body fixed to a house structure. , a horizontal support rod that supports the yoke rail, a permanent magnet that is provided at the top of the door body and faces the bottom surface of the linear motor rail and works as a linear motor in cooperation with the coil of the yoke rail, and a yoke rail. or a position detecting means provided between a stationary body equivalent thereto and the door body, detecting the relative position of the yoke rail and the door body, and selectively controlling the drive coil of the linear motor coil according to the relative position; Electromagnets are installed near both ends of the upper part of the door body in the moving direction to attract the yoke rail, and gap sensors are installed near both ends of the upper part of the door body in the moving direction to detect the gap between the yoke rail and the electromagnet. A magnetic levitation self-propelled suspended sliding door characterized by comprising: