JP2008081323A - Feeder system for elevator with a plurality of cars - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a feeder system for an elevator with a plurality of cars, capable of performing stable electric power supply to the cars even if a power supply load to the cars fluctuates. <P>SOLUTION: The feeder system for the elevator with the plurality of cars includes: a feeder body 10 for supplying electric power to each of the first car 1a and the second car 1b lifted along a guide rail 2 inside one hoistway 100; a first power receiving body 5a and a second power receiving body 5b mounted on the first car 1a and the second car 1b respectively to receive electric power from the feeder body 10; a feeder line 11 electrically connected to the feeder body 10; a first pickup 12a and a second pickup 12b provided at the first car 1a and second car 1b and brought close in a non-contact manner to the feeder line 11 to supply electric power to the first power receiving body 5a and second power receiving body 5b by electromagnetic induction; and a dummy pickup 61 for detecting a current flowing through the feeder line 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an elevator including a plurality of cars in one hoistway, and more particularly to a multi-car elevator power supply apparatus that supplies electricity to each car.

  Electrical equipment such as lighting devices, ventilation devices, and air conditioning equipment is attached to the elevator car, and there is a need to supply power to these electrical devices.

FIG. 5A and FIG. 5B are elevator power supply apparatuses described in Patent Document 1, for example.
The elevator power feeder includes a fixed power feeder 3 provided on the upper side of the hoistway 100, an inverter power feeder 10 connected to the fixed power feeder 3, and a moving path from the inverter power feeder 10 to the hoistway 100. A power supply line 11 provided along the power line 5, a power receiving body 5 provided in the car 1 traveling on the hoistway 100, and a power supply to the power receiving body 5 provided in the car 1 without contact with the power supply line 11 in a non-contact manner. And a battery 13 disposed between the pickup 12 and the power receiver 5.

FIG. 6 is a control block diagram of the elevator power supply apparatus having the above-described configuration.
The elevator power supply apparatus includes an inverter power supply body 10, a power supply line 11 connected to the inverter power supply body 10, a pickup 12 that is in close contact with the power supply line 11, and a power receiver that is electrically connected to the pickup 12. And 5.
The power receiver 5 includes a rectifier circuit 31 that rectifies the output received by the pickup 12, a stabilization circuit 32 that stabilizes the rectified output, a smoothing circuit 33 that smoothes the stabilized output, and the smoothing. And a control circuit 34 that performs various controls according to the output.
As shown in FIG. 7A, the inverter power feeder 10 includes a DC drive circuit 40 and a switching circuit 41 that converts a DC voltage of the DC drive circuit 40 into an alternating current, and is converted by the switching circuit 41. The alternating current is output to the feeder line 11.

Incidentally, an example in which the pickup 12 is applied to a plurality of car elevators has not been found. However, as shown in FIG. 7B, the first pickup 12a and the second pickup 12b of each of the plurality of cars 1 are used. Can be considered as a configuration in which the power supply line 11 is connected in series.
In a plurality of car elevators, there is a case where one car is stopped, a case where a cooler is turned on or off in each car, and the load varies in each car. In this example, the first pickup 12a and the second pickup 12b are connected to the feeder line 11 in series and are divided by the respective pickups 12a and 12b. Due to the fluctuation, the voltage applied to the other car 1 changes. Further, the current flowing through the feeder line 11 varies in each car 1 according to the variation in the load.
As described above, the power supplied to each car 1 via the first pickup 12a and the second pickup 12b is not stable.

JP 9-56088 A

  When power is supplied to a plurality of cars in a non-contact manner using the pickups 12a and 12b, the amount of power supplied to the other car 1 is affected and fluctuates due to fluctuations in the power supply load to one car 1. There is a problem that it is difficult to stably supply power to each car 1.

  An object of the present invention is to solve the above-described problems, and a plurality of non-contact types capable of stably supplying power to a car even when a power supply load to the car fluctuates. It aims at providing a car elevator electric power feeder.

  A multi-car elevator power feeder according to the present invention includes a power feeder that supplies power to a plurality of cars that are lifted and lowered along a guide rail in one hoistway, and a power that is attached to each of the cars and that is supplied from the power feeder. A power receiving body that is electrically connected to the power feeding body and provided along the moving path of the hoistway, and is provided for each of the plurality of cages in a non-contact manner. A pickup that supplies power to the power receiver by electromagnetic induction in proximity to each other and a dummy pickup that detects a current flowing through the feeder line are provided.

  According to the multi-car elevator power supply apparatus according to the present invention, even if a power supply load fluctuation to the car occurs, the voltage of the power supply body on the power supply side changes according to the load, and each car has a desired power. Supplied.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the same or corresponding parts as those in the related art will be described with the same reference numerals.
Embodiment 1 FIG.
FIG. 1 (A) is a perspective view showing a schematic configuration of a multi-car elevator power supply apparatus according to Embodiment 1 of the present invention, and FIG. 1 (B) is an enlarged view of the pickup of FIG. 1 (A).
The multi-car elevator power feeder includes a fixed power feeder 3 provided on the upper side of the hoistway 100, an inverter power feeder 10 connected to the fixed power feeder 3, and the movement of the hoistway 100 from the inverter power feeder 10 The feeder 11 provided along the route, the first power receiving body 5a attached to the first car 1a and the second car 1b traveling along the guide rail 2 in the hoistway 100, the second Power receiving body 5b.
The multi-car elevator power supply device is attached to each of the first car 1a and the second car 1b, and is close to the power supply line 11 in a non-contact manner and supplies power to the power receiving bodies 5a and 5b by electromagnetic induction. A first pickup 12a, a second pickup 12b, current control means for controlling the current flowing through the feeder line 11 to be constant, a first pickup 12a, a second pickup 12b, and a first power receiver 5a, The battery 13 is provided between each of the second power receiving bodies 5b. The first pickup 12a and the second pickup 12b are constituted by high-frequency transformers.
The battery 13 is not necessarily required. Further, for example, a non-contact signal transmission body 20 using electromagnetic waves is used for signal transmission to the first car 1a and the second car 1b.

As in the case shown in FIG. 6, the first and second power receiving bodies 5a and 5b include a rectifying circuit 31 that rectifies the output received by the pickups 12a and 12b, and stabilization that stabilizes the rectified output. A circuit 32, a smoothing circuit 33 for smoothing the stabilized output, and a control circuit 34 for performing various controls by the smoothed output are provided.
The inverter feeder 10 includes a DC drive circuit 40 and a switching circuit 41 that converts the DC voltage of the DC drive circuit 40 into alternating current, as shown in FIG. The converted alternating current is output to the feeder line 11.
As shown in FIG. 2, the elevator power supply apparatus includes a dummy pickup 61 (not shown in FIG. 1) that detects a current flowing through the power supply line 11.
The current control means for controlling the current flowing through the feeder line 11 to be constant from the current value detected by the dummy pickup 61 compares the detected current value with the command current value I _ref, and the difference current value Is provided with a control circuit 42 for transmitting a command voltage signal to the PWM circuit 62 so that becomes zero. The PWM circuit 62 generates a PWM signal so that the switching circuit 41 outputs a voltage corresponding to the command voltage signal.

  In the multi-car elevator power supply apparatus configured as described above, the current flowing through the power supply line 11 is detected by the dummy pickup 61. The detected current value is compared with the command current value I by the control circuit 42, and a signal for making the current flowing through the feeder line 11 constant from the difference current value is transmitted to the inverter feeder 10 via the PWM circuit 62. For example, even if the power supply load fluctuation to the first car 1a occurs, the voltage of the inverter power supply body 10 on the power supply side changes according to the load. Therefore, the influence of the load fluctuation of the first car 1a is affected. Without receiving, the first car 1a and the second car 1b are each supplied with desired power.

FIG. 3 is a diagram showing another current control means for making the current flowing through the feeder line 11 constant. In this example, the frequency of the feeding voltage of the inverter feeder 10 is made constant, and the resonance frequency is the same as this frequency. LC filter 43 (current control means) as an LC circuit having
In this configuration, if the frequency on the power supply side is f ₀ , the constants of the inductor L and capacitor C of the constant current circuit are L ₁ and C ₁ ,
f ₀ = 1 / 2π (L ₁ · C ₁ ) ^1/2
The frequency f ₀ is determined so that
If comprised in this way, it will work so that the electric current by the side of an electric power supply may be driven with constant current. Therefore, a necessary current can be taken out according to the request of the pickups 12a and 12b. In particular, in this apparatus, since the frequency on the power supply side is constant, L and C can be set to constants, and the structure can be simplified.

2 requires a high-speed and complicated control circuit 42 that instantaneously controls current according to load fluctuations of the first car 1a and the second car 1b. In the multi-car elevator power supply device of FIG. 3 using the LC filter 43 as a means, there is a constant change due to a temperature change or the like even if the current is kept constant, but a control circuit is not required if such a change is allowed. It is.
Even when the change in the constant is corrected, the response speed does not need to be quick, and a correction circuit (not shown) having a simple configuration may be used.
If the power supply side is a current control means capable of driving at a constant current, the same effect can be obtained with other configurations.

  Further, in the example of FIG. 1, the feeder 11 and the pickups 12a and 12b are provided on the side surfaces of the first car 1a and the second car 1b on the door 70 side (A portion in FIG. 4). The power supply line 11 and the pickups 12a and 12b may be arranged in the gaps of the portions as indicated by a, b, c, d, and e. In particular, since there are gaps occupied by the guide rails 2 on the side surfaces of the cars 1a and 1b to which the guide rails 2 are attached, the feeder lines 11 and the pickups 12a and 12b can be placed without increasing the size of the entire hoistway 100 if arranged there. Can be placed.

1A is a perspective view showing a schematic configuration of a multi-car elevator power supply apparatus according to Embodiment 1 of the present invention, and FIG. 1B is an enlarged view of the pickup of FIG. FIG. 2 is a control block diagram of the multi-car elevator power supply apparatus of FIG. 1. It is another control block diagram of a multi-car elevator power feeder. It is a cross-sectional view of the multi-car elevator power supply device of FIG. FIG. 5A is a schematic perspective view of a conventional non-contact type elevator power supply apparatus, and FIG. 5B is an enlarged view of the pickup of FIG. It is a control block diagram of the elevator electric power feeder of FIG. 7A and 7B are electric circuit diagrams of the inverter power feeder.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1a 1st cage | basket | car, 1b 2nd cage | basket | car, 2 guide rail, 3 fixed side feeder, 5a 1st receiver body, 5b 2nd receiver body, 10 inverter feeder body, 11 feeder line, 12a 1st pickup 12b Second pickup, 43 LC circuit, 50 counter, 61 dummy pickup, 100 hoistway.

Claims (3)

A power feeder for supplying power to a plurality of cages moving up and down along a guide rail in one hoistway;
A power receiver that is attached to each of the cages and receives power from the power feeder;
A power supply line electrically connected to the power supply body and provided along a movement path of the hoistway;
A pickup that is provided for each of the plurality of cars and that is close to the feeder line in a non-contact manner and supplies power to the power receiver by electromagnetic induction; and
A dummy pickup for detecting a current flowing in the feeder line;
Multi-car elevator power feeder with   The multi-car elevator power supply apparatus according to claim 1, further comprising current control means for controlling the current flowing through the power supply line to be constant from the current value detected by the dummy pickup.   The multi-car elevator power supply apparatus according to claim 2, wherein the current control means is an LC circuit having a resonance frequency equal to a frequency of a power supply voltage of the power supply body.

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