JPH061548A - Ropeless linear motor elevator - Google Patents

Abstract

PURPOSE:To enhance safety by preventing passengers from being uncomfortably shocked at the time of emergency suspension, and also preventing the passengers from tumbling down. CONSTITUTION:An uninterceptive power supply supplying electric power at least until a car is suspended if the power should fail, is provided for a control section to gradually decelerate the car at the time of emergency suspension with a linear motor controlled by the control section 25, and the car is so devised as to be kept in a suspended condition with a braking means 8 actuated by the control section 25 after the suspension of the car has been detected by a speed detection section 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low press linear motor elevator for raising and lowering a car by using the propulsive force of a linear motor without using a rope.

[0002]

2. Description of the Related Art FIG. 2 shows, for example, Japanese Utility Model Laid-Open No. 62-136476.
It is a block diagram which shows the conventional low press linear motor elevator similar to what was shown by the gazette etc. In the figure, 1 is a hoistway, 2 is a primary coil arranged side by side on both side walls of the hoistway 1, 3 is provided on both side walls of the hoistway 1, and a pair of vertically extending guide rails 4 is a hoistway. It is a car that is provided in the road 1 and moves up and down along the guide rails 3.

A plurality of secondary permanent magnets 5 are attached to the car 4 so as to face the primary coil 2,
The permanent magnet 5 and the primary side coil 2 constitute a linear synchronous motor. The primary side coil 2 is a variable voltage variable frequency control device (not shown) (hereinafter referred to as VVVF).
It is abbreviated as a device. ), A linear synchronous motor is driven through this VVVF device, and the generated propulsive force causes the car 4 to move up and down between the floors 6 in the hoistway 1.
A VVVF device is disclosed in, for example, Japanese Patent Laid-Open No. 61-1.
No. 70287, for example.

Reference numeral 7 is a guide roller which is provided at the center of the upper and lower ends of both side walls of the car 4 and which rolls along the guide rails 3, and 8 is a braking device which is provided below the car 4.

FIG. 3 is a configuration diagram specifically showing the braking device 8 of FIG. In the figure, 9 is a braking shoe that is fixed to the tip of a pair of levers 10 and holds the guide rail 3 from both sides, and each lever 10 is rotatably attached about a pin 11. Reference numeral 12 denotes a spring provided between the other ends of the levers 10, and the pressing force of the spring 12 presses each braking shoe 9 against the guide rail 3.

Reference numeral 13 denotes a rod connected to the other end of each lever 10. The rod 13 faces the electromagnet device 14, and when the electromagnet device 14 is excited, the rod 13 is attracted, As a result, each lever 10 is rotated against the spring 12, and each braking shoe 9 is separated from the guide rail 3.

Next, the operation will be described. When the signal of the start command is input, the electromagnet device 14 is excited and the braking device 8 is opened. The VVVF device generates an AC voltage having a predetermined voltage and frequency according to a predetermined speed command signal and applies the AC voltage to the primary coil 2. As a result, the primary coil 2 is excited and a propulsive force is generated in the linear synchronous motor, and the propulsive force causes the car 4 to move up and down in the hoistway 1.
After that, when the car 4 arrives at the target floor, the braking device 8 holds the car 4 in a stopped state to stop it, and
The VF device cuts off the excitation of the primary coil 2.

Thus, the braking device 8 holds the stopped state of the car 4 every time the car 4 stops at the destination floor. Also, during an emergency stop using the emergency stop button, etc., VVV
The F device acts to stop the excitation of the primary coil 2 and immediately actuate the braking device 8 to stop the car 4.

By the way, in the conventional low-press linear motor elevator as described above, when an emergency stop occurs while the vehicle is traveling in the downward direction at the rated load W _F , a braking device is provided so as to decelerate and stop at a predetermined deceleration α _F. The braking force F _{B of} 8 is F _B =
It is set by (W _C + W _F ) × (1 + α _F / g). However, W _C is the weight of the car 4, and g is the acceleration of gravity.

On the other hand, the deceleration α _N of the car 4 in the case of an emergency stop due to the above braking force F _B while traveling upward with no load is α _N
= (W _C + F _B ) × g / W _C = g + (1 + W _F / W _C ) ×
It is represented by (g + α _F ). Here, since normally W _C = W _F , the deceleration α _N = 3g + 2α _F.

When an emergency stop occurs during upward traveling at the rated load W _F , α _N = 2g + 2α _F , and the deceleration of the car 4 becomes at least 2 g or more. On the other hand, since the deceleration of passengers in the car 4 is 1 g, in the conventional low press elevator, if an emergency stop occurs while traveling upward, the passengers will float in the car 4 and in the worst case , There is a danger that passengers will crash into the ceiling of the car 4.

Therefore, the inventor of the present invention has previously proposed a low press linear motor elevator (Japanese Patent Application No. 2-330).
No. 489), in case of emergency stop while traveling upward,
First, the excitation of the primary coil 2 is cut off, and after the car speed reaches 0, the braking device 8 is activated to prevent the passenger from rising. Further, when the emergency stop occurs during traveling in the downward direction, the braking device 8 is activated immediately.

[0013]

However, in such a conventional low press linear motor elevator,
If an emergency stop is made while the vehicle is traveling in the upward direction, it is possible to prevent the passengers from floating in the car 4, but there is a problem in that the passengers feel a considerably uncomfortable shock. That is, when the excitation of the primary coil 2 is suddenly cut off during constant traveling with the car deceleration 0, the car deceleration immediately becomes 1 g, and the passengers suddenly feel as if they are floating, Further, when the braking device 8 is operated, the deceleration inside the car becomes 0, and the passenger feels the force corresponding to his / her weight.

Next, consider a case where an emergency stop is made by the braking force F _B during traveling in the downward direction. First, in-car deceleration alpha _N in the case of emergency stop and under no _{load, α N = (W C -F} B) × g / W C =
A _{-W F / W C × g- (} 1 + W F / W C) × α F. Here, normally, since W _C = W _F , α _N = − (g + 2α _F )
Becomes In case of emergency stop at rated load, α _N =-
It becomes α _F. As described above, the deceleration greatly differs depending on the load, but at least in the state where the inside of the car 4 is almost no load, the deceleration exceeds -1 g, so that the passenger feels a great shock and the worst risk of falling. There was a problem.

The present invention has been made to solve the above problems, and it is possible to prevent unpleasant shocks to passengers at the time of emergency stop, and to improve safety. The purpose is to obtain a low-press linear motor elevator that can

[0016]

In the low-press linear motor elevator according to the invention of claim 1, when the car is stopped, the control unit controls the linear motor to gradually decelerate the car so that the speed detection unit operates. The braking device is activated after the detected speed falls below a predetermined value.

In addition to the invention of claim 1, the low-press linear motor elevator according to the invention of claim 2 is further provided with an uninterruptible power supply for supplying electric power to the control unit at least until the car is stopped at the time of power failure. It is a thing.

[0018]

According to the present invention, the car is decelerated by the linear motor and then the braking device is operated to reduce the shock to passengers due to the operation of the braking device.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a control system of a low-press linear motor elevator according to an embodiment of the invention of claims 1 and 2, and the primary side coil 2 and the braking device 8 are the same as those of FIGS. 2 and 3. Is.

In the figure, 21 is a commercial power source and 22 is a commercial power source.
It is a well-known uninterruptible power supply connected to 21, and this uninterruptible power supply 22 may have a capacity for decelerating the car 4, and may be a relatively small one. Reference numeral 23 denotes an operation control device connected to the commercial power supply 21 via the uninterruptible power supply device 22, and the operation control device 23 supplies VVVF device 24, VVVF device 24 and braking device for supplying voltage to the primary side coil 2. It has a control unit 25 for controlling 8 and an emergency stop command generator 26. Further, the emergency stop command generator 26,
An emergency stop command signal is output to the control unit 25 in response to signals from an emergency stop button (not shown), a power failure detector, or the like.

Reference numeral 27 denotes a speed detecting section for detecting the speed of the car 4 (FIG. 2), which is connected to the control section 25. As the speed detecting unit 27, for example, a unit having an encoder for detecting the rotation of the guide roller 7 (FIG. 2), a so-called linear encoder using a laser, or the like can be used.

Next, the operation will be described. For example, when the emergency stop button is pressed, it is necessary to immediately stop the operation of the elevator in the event of a power failure, an earthquake, or the like, and the emergency stop command generator 26 outputs an emergency stop command signal. The control unit 25 receiving this stop command has a deceleration (about 0.07 g) greater than the deceleration (about 0.07 g) in the case of the normal deceleration command, and the shock received by the passenger is within the allowable range (about 0. A speed command of about 2 g or less) is generated, and the VVVF device 24 is controlled based on this speed command.

As a result, the car 4 gradually decelerates and stops. When the speed detector 27 detects the stop of the car 4, the speed detector 27 outputs a stop detection signal to the controller 25, which causes the controller 25 to operate the braking device 8. As a result, the stopped state of the car 4 is mechanically maintained by the braking device 8.

In the case of an emergency stop due to a power failure, the uninterruptible power supply 22 continues to supply power to the operation controller 23, so that the car 4 is stopped in the same order as above.

In such a low-press linear motor elevator, since the car 4 is gradually decelerated at a deceleration within the allowable range for passengers and then stopped, no unpleasant shock is given to passengers during an emergency stop. In addition, the fall of passengers is prevented and safety is improved.

In the above embodiment, the car 4 is stopped completely (0 m / min) before the braking device 8 is activated. However, if the speed is safe for passengers (for example, 1 to 2 m / min), The braking device 8 may be activated before the car 4 completely stops.

[0027]

As described above, in the low press linear motor elevator according to the first aspect of the invention, the linear motor is controlled to gradually decelerate the car so that the speed detected by the speed detecting unit becomes equal to or lower than a predetermined value. Since the braking device is activated after the emergency stop, it is possible to prevent unpleasant shocks to passengers at the time of emergency stop, and to prevent the passengers from falling, thereby improving safety. There is an effect that can be.

Further, in addition to the invention of claim 1, the low-press linear motor elevator of the invention of claim 2 is provided with an uninterruptible power supply for supplying electric power to the control unit at least until the car is stopped at the time of power failure. Therefore, in addition to the same effect as the invention of claim 1, it is possible to prevent unpleasant shocks to passengers even at the time of an emergency stop due to a power outage, and to improve safety. Play.

[Brief description of drawings]

FIG. 1 is a block diagram showing a control system of a low-press linear motor elevator according to an embodiment of the inventions of claims 1 and 2.

FIG. 2 is a configuration diagram showing an example of a conventional low-press linear motor elevator.

3 is a configuration diagram showing the braking device of FIG. 2. FIG.

[Explanation of symbols]

 4 car 8 braking device 22 uninterruptible power supply device 25 control unit 27 speed detection unit

Claims (2)

[Claims] 1. A braking device which is provided in a car and mechanically stops the car, a linear motor for raising and lowering the car, and a control unit which controls the braking device, and which is connected to the control unit. A speed detection unit for detecting the speed of the car is provided, and the control unit controls the linear motor to gradually decelerate the car when the car is in an emergency stop, and the speed detected by the speed detection unit is a predetermined value. A low-press linear motor elevator characterized in that the above-mentioned braking device is activated after the following. 2. A braking device which is provided in a car and mechanically stops the car, a linear motor for raising and lowering the car, and a control unit which controls the braking device, and which is connected to the control unit, A speed detection unit that detects the speed of the car, and an uninterruptible power supply device that supplies power to the control unit at least until the car is stopped at the time of a power failure, the control unit, when the car emergency stop, A low press linear motor elevator, characterized in that the linear motor is controlled to gradually reduce the speed of the car, and the braking device is activated after the speed detected by the speed detecting unit becomes a predetermined value or less. .