JPH04298475A - Magnetic shielding device for linear motor driven elevator - Google Patents

Abstract

PURPOSE:To carry out magnetic shielding of a cage and realize weight reduction of the cage in a linear motor driven elevator. CONSTITUTION:A primary coil of a linear motor is arranged on an elevator shaft. To a cage, superconductive coils 20 as a secondary conductor are arranged in a position so as not to be on the same plane with a cage 40, that is, above or below the cage 40. Shield coils 41 consisting of superconductive wires are arranged in parallel with the superconductive coils 20. Furthermore, an iron shield member 42 is arranged in the vicinity of the superconductive coils 20 of the cage 40.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a magnetic shielding device for minimizing the influence of magnetism on passengers inside a car in a linear motor-driven elevator in which a secondary conductor that generates a high magnetic field is mounted on the car. It is something.

0002

[Prior Art] Most conventional elevators are rope traction type elevators in which the car and counterweight are connected by a main rope via a hoisting machine, and hydraulic type elevators in which the car is raised and lowered by a hydraulic jack. . However, in recent years, a type of elevator (hereinafter referred to as a linear elevator) has been proposed that uses a linear motor as a drive source and directly raises and lowers the car without interposing a main rope, hydraulic jack, etc. between the car and the hoistway.

Among these linear elevators, those using a ground primary type linear motor with a primary coil on the hoistway side and a secondary conductor on the car side are characterized in that there is no need to supply driving power to the car. be. Therefore, by omitting the traveling cable and sending and receiving signals between the car side and the hoistway side by wireless communication, and by omitting the governor rope and installing another mechanical braking device in place of the governor device, Mechanical inclusions can be eliminated between the shaft and the hoistway.

[0004] If mechanical inclusions were eliminated, the car would be extremely suitable for use in ultra-high-rise and ultra-high-rise buildings with long lifting strokes. It also becomes easier to circulate the cars on the road.

Although there are several types of ground primary type linear motors, linear synchronous motors are considered to be suitable for use in elevators. Some of these linear synchronous motors use superconducting coils, normal conducting coils, or permanent magnets as secondary conductors, but from the viewpoint of efficiency, thrust size, and ensuring a gap between the car and the hoistway, Linear synchronous motors using superconducting coils as secondary conductors are considered optimal. However, no matter which secondary conductor is used, it is necessary to generate a high magnetic field to drive the elevator, and the impact of this high magnetic field on passengers in the car, such as electronic devices, watches, pacemakers, etc. Furthermore, considering the impact on the passengers themselves, some kind of magnetic shielding measures are required.

[0006] General magnetic shielding measures that have been considered in the past include a method of magnetic shielding by laying an iron plate or the like (passive shielding), and a method of magnetic shielding using superconducting wire (active shielding).

[0007]

[Problem to be solved by the invention] In the case of passive shielding, in order to shield the high magnetic field generated by the secondary conductor, it is necessary to lay an iron plate several centimeters thick, which increases the weight considerably, making it impractical. The problem is that there is no. In the case of active shielding, in the case of conventional structures such as maglev trains, a shielding coil is provided between the passenger compartment and the secondary conductor at the bottom of the passenger compartment, resulting in a long distance between the passenger compartment and the secondary conductor. When this structure is applied to an elevator, the distance between the car and the secondary conductor increases, and the cross-sectional area of the car must be increased. In this case, the cross-sectional area of the hoistway must also be widened, and there is a problem that the limited building space cannot be used effectively.

[0008]

[Means for Solving the Problems] The present invention provides an active shield in which the secondary conductor on the car side is installed away from the car compartment in which passengers ride, and a shield coil made of superconducting wire is installed in the immediate vicinity of the secondary conductor. In addition, passive shielding is provided by laying iron plates or the like in areas of the car where sufficient magnetic shielding cannot be achieved with the active shielding alone.

[0009]

[Embodiment] An embodiment of the present invention will be explained with reference to the drawings. Figure 1
2 is an overall schematic view of the linear elevator, FIG. 3 is a detailed view of the main portion of FIG. 2 and is a side view of the car, and FIG. 4 is a plan view of the car.

In the figure, 1 is an annular hoistway, 2a and 2b are top clearances of the hoistway, and 3a and 3b are
is a pit, 4a and 4b are oil buffers, and 5a to 5e are two-story elevator cars, which are operated so as to circulate within the hoistway 1 in the direction of the arrow, that is, clockwise. 6 is a moving car that moves the car 5 (any one of 5a to 5e) from left to right in FIG. 2; 6a is installed inside the moving car 6, and forcibly stops the car 5 inside the moving car 6 7 is a moving vehicle that normally moves the car 5 from right to left in FIG. This is a switch for forcibly stopping the engine within 7 seconds.

8a, 8b are top clearances 2a, 2b
Limit switches installed in pit 3, 9a and 9b
These are limit switches installed at a and 3b, and each is operated by a cam (not shown) of the car 5. 10 is a primary coil of a plurality of linear motors provided in the hoistway 1 etc.; 11 is a control device for controlling each primary coil 10; 12 is a control device for controlling each primary coil 10;
This is a landing provided on the floor where car 5 stops.

A secondary conductor 20 is installed in the car 5 so as to face the primary coil 10 at a predetermined interval (approximately 100 mm), and is composed of an air-core superconducting coil. 2
1 is a car door, 22 is a landing door on each floor, 23 is a rack provided on the car 5 so that it can move forward and backward, and 24 is a rack provided on the hoistway 1. When the car 5 lands on the floor, It is provided at a position facing the car side rack 23. The car side rack 23 is in a backward position while the car 5 is running, and when the car 5 lands on the floor, moves forward and engages with the hoistway side rack 24 to keep the car 5 stopped.

Reference numeral 25 is a safety rail installed over the entire vertical direction of the hoistway 1, and 26 and 27 are safeties provided above and below the car 5 to grasp the safety rail 25 when an abnormality occurs. Reference numeral 28 denotes a limit switch for lifting provided on the car 5. When the car 5 rises too high, it is activated by cams (not shown) provided on the top clearances 2a and 2b, and the safety rail 25 is gripped by the safeties 26 and 27. This is to prevent the car 5 from rising too high. 29 is also a limit switch for lowering,
When the car 5 descends excessively, the cams (not shown) provided in the pits 3a and 3b operate, causing the safeties 26 and 27 to grab the safety rail 25, and the car 5
This prevents an excessive drop in the temperature.

Reference numeral 30 denotes a guide roller that prevents the car 5 from colliding with the wall surface of the hoistway 1, and is provided with a gap of about 30 mm from the top surface of the safety rail 25 under normal conditions. . 31 is also a guide roller, 32
is a roller rail installed across the entire vertical length of the hoistway 1 at a position facing the rollers 31;
Near the position where the car 5 lands on the floor, it protrudes toward the car 5 side and comes in contact with the roller 31, which prevents the car 5 from shifting in the front-rear direction (horizontal direction in FIG. 4) when it lands on the floor, i.e. ,
This prevents fluctuations in the gap between the car 5 and the landing 12. At other locations, the roller 31 is installed so as to maintain a gap of about 30 mm from the roller 31.

Reference numeral 40 indicates a car compartment in which passengers ride, 41 indicates a shield coil made of superconducting wire provided for each superconducting coil 20, and 42 indicates an iron shield material. In this example,
With respect to the superconducting coil 20, the shield coil 41 serves as an active shield, and the shield material 42 serves as a passive shield, thereby reducing the magnetic flux density within the car compartment 40. In FIG. 1, solid arrows indicate superconducting coil current, and broken arrows indicate shield coil current. With the above configuration, the car 5 stops at each landing 12 while
Circulation operation is performed within the hoistway 1. This example will be described in detail below.

In the case of the elevator of this embodiment, the magnetomotive force of the superconducting coil 20 is several hundred KAT, and the magnetic flux density within the car 40 is extremely high, which has a large effect on passengers. Therefore, first, the superconducting coil 20 is placed apart from the car compartment 40. That is, as shown in FIG. 3, the superconducting coil 20 is arranged above or below the car 40 so that the superconducting coil 20 is not on the same plane as the car 40. Since the magnetic flux density attenuates in inverse proportion to the square of the distance, by configuring the superconducting coil 20 to be separated from the car 40 in this way, the magnetic flux density in the car 40 can be lowered.

Next, as shown in FIG.
A shield coil 41 is provided in a loop shape along each side of the superconducting coil 20, and the magnetic flux is canceled out by the induced current accompanying the change in the magnetic flux of the superconducting coil 20. This shield coil 41 is made of superconducting wire and has zero electrical resistance, so it is possible to flow a loop current that completely cancels out the magnetic flux. By setting this, the magnetic flux can always be kept at zero on the shield coil surface.

With this configuration, the magnetic flux density can be considerably reduced near the center of the cage 40 away from the superconducting coil 20. Incidentally, the closer the shield coil 41 is brought to the superconducting coil 20, the more
The shielding effect is improved because the shielding coil current increases and the magnetic flux that cancels out the magnetic flux due to the superconducting coil 20 increases.

However, with only the above configuration, the magnetic flux density does not decrease sufficiently near the superconducting coil 20 at the end of the car 40 due to the influence of leakage magnetic flux. Therefore, in addition to the above configuration, an iron shielding material 42 is provided near the superconducting coil 20 at the end of the car 40 to suppress the magnetic flux density within the entire area of the car 40 to a certain value or less. In the above example, the cage 40 and the superconducting coil 20 above it have been described, but the same applies to the cage 40 and the superconducting coil 20 below it.

As described above, according to this embodiment, the superconducting coil 20 is placed as far away from the car compartment 40 as possible, and the passive shield and active shield are used together, so the amount of shielding material 42 used for the passive shield is reduced. Therefore, the weight of the car room 40 can be reduced.

Next, another embodiment of the present invention will be explained with reference to FIG. In the above embodiment, since each shield coil 41 is provided for each superconducting coil 20, leakage of magnetic flux may occur between each shield coil 41. Therefore, in this embodiment, the shield coils 41 are connected to form a mesh to eliminate leakage of magnetic flux. By doing so, the magnetic flux density within the car room 40 and in the upper part of the car room 40 can be reduced.

[0022] In the case of an elevator, workers go up to the top of the car room 40 to perform maintenance and inspection, so
This embodiment, which reduces the magnetic flux density above 0, is more practical. Of course, a passive shield may be added to the anti-superconducting coil 20 side of the shield coil 41 in order to further reduce the magnetic flux density in the upper part of the cage 40.

Next, still another embodiment of the present invention will be described with reference to FIG. This embodiment is similar to the embodiment of FIG. 1 or 5.
Shield coils 41a and 41b are added. By adding the shield coils 41a and 41b, leakage magnetic flux from the lower end of the superconducting coil 20 to the car chamber 40 can be suppressed.

According to this embodiment, since leakage magnetic flux is smaller than in the case of FIG. 1 or FIG. 5, the amount of shielding material 42 used can be further reduced, and the weight of the cage 40 can be further reduced. .

In the above description, the case where a superconducting coil is used as the secondary conductor is explained, but the same applies to the case where a normal conducting coil or a permanent magnet is used. In addition, although iron is used as a passive shield, metals such as copper and aluminum, or plastic glass that has been subjected to conductive treatment such as conductive plastic glass or conductive surface-treated plastic glass may also be used. .

[0026]

[Effects of the Invention] As explained above, according to the present invention,
In an elevator that uses a ground primary type linear motor that uses a superconducting coil on the car side, it is possible to reduce the weight of the car while keeping the magnetic flux density in the car and the upper part of the car sufficiently small.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a main part of a magnetic shielding section showing an embodiment of the present invention.

FIG. 2 is an overall schematic diagram of a linear elevator according to an embodiment of the present invention.

FIG. 3 is a detailed view of the main part of FIG. 2 and a side view of the cage.

FIG. 4 is a plan view of the cage.

FIG. 5 is a diagram showing another embodiment of the present invention.

FIG. 6 is a diagram showing still another embodiment of the present invention.

[Explanation of symbols]

1 Hoistway 5, 5a to 5e Cars 6, 7 Moving vehicle 10 Primary coil 11 Primary coil control device 12 Landing area 20 Superconducting coil 21 Car door 22 Landing door 40 Car room 41, 41a, 41b Shield coil 42 Shielding material

Claims (4)

[Claims] [Claim 1] In an elevator using a ground primary type linear motor having a primary coil on the hoistway side and a secondary conductor on the car side, the secondary conductor is installed at a position not on the same plane as the car room, A shielding coil made of superconducting wire is provided on the side opposite to the hoistway of the secondary conductor, and a shielding material made of metal or conductive treated plastic glass is provided near the secondary conductor in the car room. Magnetic shielding device for linear motor driven elevators. 2. The magnetic shielding device for a linear motor-driven elevator according to claim 1, wherein a plurality of said secondary conductors are installed, and said shield coil is installed for each said secondary conductor. 3. The magnetic shielding device for a linear motor-driven elevator according to claim 2, wherein the shield coils installed for each of the secondary conductors are connected to form a mesh. 4. The shielding coil according to claim 1, wherein the shield coil is provided not only on the side opposite to the hoistway of the secondary conductor, but also between the secondary conductor and the cab. 3. The magnetic shielding device for a linear motor-driven elevator according to any one of 3.