JPH04365778A - Elevator device - Google Patents

Abstract

PURPOSE:To provide an elevator device whose cage can run very quietly and stably not making contact with a guide rail or the like at all. CONSTITUTION:Secondary conductors 20 of a linear motor are arranged in both right/left side surface of a cage 2 to provided concurrently propelling primary coils 10 and longitudinal directional guiding guide coils 30 in a lift path side of a position opposed to the secondary conductor. Further, the primary coils in both right/left sides are connected to nullflux, and the guide coil is formed in 8-shape, by connecting two loop-shaped coil sides 31, 32 crossed, and arranged so as to negate mutually voltage induced in each coil side, when the cage runs in a center position in the longitudinal direction.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator driven by a linear motor.

[Prior Art] In conventional elevators, a rope with a car at one end and a counterweight suspended at the other end is wound around a sheave of a hoist, and the friction between the rope and sheave is used to raise and lower the car. Traction systems are common, but recently various elevators using linear motors as drive sources have been proposed.

[0002] As an example of this, for example, Japanese Patent Application Laid-Open No. 2-261
There is one such as shown in Publication No. 789. Linear motors are formed on both the left and right sides of the car, and the car is driven by the linear motors and is moved up and down while being guided on guide rails by guide rollers attached to the top and bottom of the car. There is.

FIG. 7 shows the arrangement of the primary coil and secondary conductor of this conventional linear motor. Figure 7(a)
is a diagram showing a horizontal cross-section of the hoistway. In the figure, 1 is the hoistway, 2 is the car, 3 is the car door, 20 is the secondary conductor of the linear motor arranged on both sides of the car, and 10 is the secondary conductor. conductor 20
This is the primary coil of the linear motor installed on the hoistway side, facing the Figure 7(b) is A of Figure 7(a).
- As shown in the A-line arrow view, the primary coil 10 is attached to the hoistway throughout the entire lifting stroke (partially not shown), and like a normal linear synchronous motor, a power converter (not shown) is attached to the hoistway throughout the lifting stroke. (omitted) supplies power to this primary coil, and controls the thrust between the primary coil and the secondary conductor to drive the car.

0004

[Problems to be Solved by the Invention] However, in this configuration where linear motors are provided only on both left and right sides of the car,
Even if the car shifts in the front-rear direction while it is running, the linear motor cannot provide the restoring force against it, so if there is no guide device such as a guide roller, the car will run very unstable. Therefore, with this configuration, it is necessary to always run while maintaining contact between the guide device and the guide rail, and as a result, it is absolutely necessary to avoid contact noise and sliding noise between the guide device and the guide rail that occur during running. However, there was a problem in that the noise generated became louder, especially when driving at high speeds.

[0005] Furthermore, when this guide device is applied, it is necessary to accurately install the guide rail in order to suppress sliding noise and car vibration, but this task becomes more difficult as the lifting distance becomes longer. In the case of super high-rise buildings and super high-rise buildings, the lateral sway and distortion of the building become large, so it is extremely difficult to ensure accuracy during and after installing the guide rail.

The present invention has been made in view of the above-mentioned problems, and it is possible to run the car stably without providing a guide device, or even if a guide device is provided for safety, it does not require a guide device. The gap between the guide rails can be made large, so the car does not come into contact with the guide rails, etc. while running, so the car can run extremely quietly, and the installation accuracy of the guide rails does not have to be kept that high. The purpose is to provide an elevator system without

[0007]

[Means for Solving the Problems] In order to solve the above problems, in the present invention, secondary conductors of the linear motor are arranged on both left and right sides of the car, and on the hoistway side facing the secondary conductors, A primary coil for propulsion and a guide coil for guiding the car in the front and rear directions are installed throughout the entire lifting stroke.

Furthermore, when the car runs at the center position in the left-right direction, the primary coils on both the left and right sides are connected to a null flux so that the voltages induced in the primary coils cancel each other out, and the guide coil is connected to two loop-shaped coils. The sides are connected crosswise to form a figure 8 shape, and the coils are arranged so that when the car runs at the center position in the front-rear direction, the voltages induced on each coil side cancel each other out.

[0009]

[Function] If the car shifts in the left-right direction while running, the primary coil is connected to the null flux, so a repulsive force is generated on the side where the primary coil and secondary conductor are close to each other. A suction force is generated on the opposite side. When the car shifts in the front-rear direction while running, a repulsive force is generated on one side of the guide coil, and an attractive force is generated on the other side of the guide coil. That is, while the car is running, no matter which direction the car shifts, a restoring force always acts between the secondary conductor and the primary coil, or between the secondary conductor and the guide coil.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the arrangement of a linear motor and a guide coil in the present invention, and is a diagram corresponding to FIG. 7, and the same parts as in FIG. 7 are designated by the same symbols (the same applies to FIGS. 2 and below).
. In FIG. 1(a), reference numeral 30 denotes a guide coil for guiding the car 2 in the front-rear direction, and like the primary coil 10, it is provided on the hoistway side at a position facing the secondary conductor 20. FIG. 1(b) is a view taken along line B-B in FIG. 1(a).
As shown in the figure, the guide coil 30 has two coil sides 31 and 32 connected across each other to form a figure 8 shape, and is attached to the hoistway throughout almost the entire lifting stroke (partially not shown).

FIG. 2 is a diagram showing the connection between the left and right primary coils and how the induced voltage is generated when the car runs at the left and right center positions. In FIG. 2, 4 is the primary coil 1
This is a VVVF (Variable Voltage Variable Frequency) control device that supplies propulsion current for driving the car to the main coil 10, and only a portion of the primary coil 10 is shown. In addition, the secondary conductor 2 of the linear motor
0, for example, a superconducting coil (superconducting magnet), a normal conducting coil, a permanent magnet, etc. can be used.

In a linear synchronous motor as shown in FIG. 2, when the cage moves, that is, the secondary conductor 20 moves in the traveling direction, and the magnetic flux from the secondary conductor 20 is sequentially transferred to the primary coil 1.
When the voltage crosses 0, an induced voltage is generated in the primary coil 10. This induced voltage is maximum at the location where the change in the magnetic flux generated by the secondary conductor 20 is greatest, that is, at the primary coil 10 at the position shown in FIG. 2.

As shown in FIG. 2, when the car is running at the center position in the left-right direction, that is, the gap L1 between the left primary coil and the secondary conductor 20 and the right primary coil 1
When the gap L2 between 0 and the secondary conductor 20 is equal, the induced voltage V1 generated in the left primary coil 10 and
Since the induced voltage V2 generated in the right primary coil 10 is equal in magnitude and opposite in direction, when the left and right primary coils are connected to a null flux as shown in the figure, the induced voltages V1 and V2 cancel each other out, Therefore, no induced current due to this induced voltage flows through the primary coil, so no lateral guiding force is generated.

However, as shown in FIG. 3, for example, if the car shifts to the right while traveling, that is, the left gap L1
is larger than the gap L2 on the right side, the induced voltage generated in the primary coil is V1 < V2
Due to the difference, an induced current flows in the left and right primary coils. FIG. 4 shows how this induced current flows.

As shown in FIG. 4, an induced current as shown by the broken line arrow flows in each of the left and right primary coils due to the difference in induced voltage, but this induced current has a phase difference with respect to the induced voltage due to the inductance of the coil. is delayed. For this reason, Figure 3
The induced current lags a little behind the induced voltage shown in FIG. 4, and flows at a position where the car position is slightly higher than that shown in FIG. 3, as shown in FIG. Note that this lag phase increases as the frequency of the interlinking magnetic flux increases, that is, as the moving speed of the secondary conductor increases, and as the resistance of the coil decreases.

This induced current is in the same direction as the induced voltage in the right primary coil, and a repulsive force is created between the secondary conductor and the right primary coil due to the magnetic flux generated by this induced current and the magnetic flux of the secondary conductor. However, in the left primary coil, an induced current flows in the opposite direction to the induced voltage, and due to the magnetic flux generated by this induced current and the magnetic flux of the secondary conductor, an attractive force is created between the secondary conductor and the left primary coil. acts. In other words, by connecting the left and right primary coils to a null flux, no matter which direction the car shifts to the left or right, a repulsive force will always act on the side where the gap between the primary coil and the secondary conductor is smaller, and vice versa. Since a suction force always acts on the side where the gap is large, a restoring force always acts in the left and right directions, making it possible to obtain a stable guiding force.

Next, the function of the guide coil will be explained. FIG. 5 is a diagram showing the arrangement relationship between the guide coil and the secondary conductor, and when the car runs at the center position in the front-rear direction, the center line of the secondary conductor 20 in the front-rear direction and the center of the guide coil 30 in the front-rear direction. The lines are placed so that they match.

As with the primary coil, the secondary conductor 20
When the secondary conductor 20 moves in the traveling direction and the magnetic flux from the secondary conductor 20 crosses the guide coil 30 one after another, an induced voltage is generated on each coil side 31 and 32 of the guide coil 30. As in the case of the primary coil, this induced voltage reaches its maximum at the point where the change in the magnetic flux generated by the secondary conductor is greatest, and the phase of the induced current lags slightly behind the induced voltage, so the cage is in the position shown in Figure 5. When this point is reached, the induced current flowing through the illustrated guide coil 30 becomes maximum.

However, as shown in FIG. 5, when the car is running at the center position in the longitudinal direction, the induced voltage generated on the coil side 31 and the induced voltage generated on the coil side 32 are different in direction and magnitude. Since the coil sides 31 and 32 are connected equally and across each other, the induced voltages V1 and V2 cancel each other out, and therefore no induced current (loop current) flows in the guide coil 30, so that the guide coil 30 cannot be guided in the front-back direction. No force is generated.

However, as shown in FIG. 6, if the car shifts forward while running, the front coil side 3
The induced voltage at the first coil side 32 is larger than the induced voltage at the rear coil side 32, and due to the difference, an induced current as shown by the broken line arrow flows through the guide coil 30. As a result, the magnetic flux generated by the induced current is in opposite directions between the front coil side 31 and the rear coil side 32, and this magnetic flux and the secondary conductor 2
Due to the magnetic flux of 0, a repulsive force acts between the secondary conductor 20 and the front coil side 31, and the secondary conductor 20 and the rear coil side 3
An attractive force acts between the two.

[0021] In this way, when the car shifts forward, a restoring force acts in the backward direction due to the induced current in the guide coil as described above, and conversely, when the car shifts backward, Since the restoring force acts in the front direction, the restoring force always acts in the front-back direction, and a stable guiding force in the front-back direction can be obtained.

[0022]

[Effects of the Invention] As described above, according to the present invention, on the inside of the tower at a position facing the secondary conductors arranged on both the left and right sides of the car,
Since a primary coil for propulsion and a guide coil for guiding the car in the longitudinal direction are installed in each case, even if the car shifts in either the longitudinal direction or the left/right direction while the car is running, a restoring force acts and the car can provide extremely stable running performance. Therefore, while the car is running, the gap between the guide device and the guide rail can be made large so that there is no contact, so extremely quiet running performance can be achieved, and the higher the building, the greater the effect.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating an embodiment of the present invention, and is a diagram illustrating the arrangement of a linear motor and a guide coil.

FIG. 2 is a diagram showing the connection of the primary coil and how induced voltage is generated when the car runs at the center position in the left-right direction.

FIG. 3 is a diagram showing the connection of the primary coil and how an induced voltage is generated when the car position shifts to the right while the car is running.

FIG. 4 is a diagram showing the connection of the primary coil and how an induced current is generated when the car position shifts to the right while the car is running.

FIG. 5 is a diagram showing the arrangement relationship between a guide coil and a secondary conductor.

FIG. 6 is a diagram showing how an induced current is generated in a guide coil when the car position shifts forward during running.

FIG. 7 is a diagram showing the arrangement of a primary coil and a secondary conductor of a linear motor in the prior art.

[Explanation of symbols]

1 Hoistway 2 Basket 3 Car door 4 VVVF control device 10 Primary coil 20 Secondary conductor 30 Guide coil V1, V2 Induced voltage

Claims (3)

[Claims] Claim 1: In an elevator device in which a car is driven by a linear motor, a secondary conductor of the linear motor is arranged on both left and right sides of the car, and a secondary conductor of the linear motor is arranged on the hoistway side at a position facing the secondary conductor, and a conductor is provided throughout the entire lifting stroke. An elevator system characterized by having a primary coil for propulsion and a guide coil for guiding the car in the front and back direction. Claim 2: When the size of the gap between the primary coil and the secondary conductor is equal on both the left and right sides of the car, the gap between the left and right sides is set so that the voltages induced in the primary coil by movement of the secondary conductor cancel each other out. 2. The elevator system according to claim 1, wherein the primary coil is connected to a null flux. [Claim 3] The guide coil has two loop-shaped coil pieces connected crosswise to form a figure-eight shape, and the voltage induced in each coil piece by the movement of the secondary conductor is the same as that of the car in the front-back direction. 3. The elevator system according to claim 1, wherein the elevators are arranged so that they cancel each other out when traveling in the center position.