Power supplying device for plural car elevator

Details Power supplying device for plural car elevator Power supplying device for plural car elevator

2000-10-24

2001-12-25

Patel, Rajnikant D. (Department: 2838)

Electric power conversion systems

Current conversion

Using semiconductor-type converter

C187S295000

Reexamination Certificate

active

06333865

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an elevator having a plurality of cars within one hoistway, and particularly to a power supplying device for a plural car elevator, the power supplying device supplying electricity to each of the cars.
2. Description of the Related Art
An elevator car is provided with electrical appliances such as lighting equipment, a ventilator, and an air-conditioner, and these electrical appliances need to be supplied with power.
FIG. 7
is a perspective view showing a power supplying device for an elevator which is now widely used.
FIG. 8
is a transverse sectional view corresponding to FIG.
7
.
This power supplying device for an elevator comprises a fixed-side power supplying member
3
(including a signal transmission function) disposed at the top of a hoistway
100
; a power receiving member
5
disposed on a car
1
traveling within the hoistway
100
along guide rails
2
, and a cable
4
for supplying power, the cables being lowered from the fixed-side power supplying member
3
toward the car
1
, being fixed on the bottom surface of the car
1
via a upwardly-folded portion
80
, and being electrically connected with the power receiving member
5
.
The fixed-side power supplying member
3
is disposed in a machine house together with a winding machine driving the car
1
, a control member, power source equipment, and the like, and transmits power or signals to the car
1
through the cable
4
. Here, reference numeral
50
denotes a counter.
Since the folded portion
80
of the cable
4
is subjected to repeated deformations by successive up and down movements for a long time period (for example, 20 years), it requires a curvature to some extent in order to withstand the repeated deformations. Therefore, to pass through the narrow gap between the car
1
and the wall
101
of the hoistway
100
, and to secure a curvature to some extent, the cable
4
is generally fixed on the bottom of the car
1
.
However, as shown in FIG.
9
and
FIG. 10A
, when applying this system to a plural car elevator having first and second cars
1
a
and
1
b
within one hoistway
100
, a problem arises that, once the cars
1
a
and
1
b
approach each other, the folded portion
80
a
of the first cable
4
a
of the first car
1
a
can make contact with the upper portion of the second car, so that the folded portion
80
a
can be caught on the second car
1
b
, resulting in a reduction in the lifetime.
As one solution to this problem, there is a suggestion that, as shown in
FIG. 10B
, for example, the installation positions of the first and second cables
4
a
and
4
b
are set to the sides of the first and second cars
1
a
and
1
b
, respectively. In this case, however, in order to obtain a bending curvature required for each of the cables
4
a
and
4
b
, it is necessary to secure a large space between the cars
1
a
and
1
b
, and the wall
101
of the hoistway
100
. This also creates a problem that the cross sectional area of the hoistway
100
increases, leading to a reduction in space efficiency.
FIGS. 11A and 11B
show the power supplying device for an elevator disclosed in Japanese Unexamined Patent Application Publication No. 9-56088.
This power supplying device for an elevator comprises a fixed-side power supplying member
3
disposed at the top of a hoistway
100
; an inverter power supplying member
10
connected to the fixed-side power supplying member
3
; a power feeding line
11
disposed along the travel path in the hoistway
100
from the inverter power supplying member
10
; a power receiving member
5
disposed on a car
1
traveling within the hoistway
100
; a pickup
12
comprising a high-frequency transformer which supplies power to the power receiving member
5
by electromagnetic induction, while being brought close to the power feeding line
11
in a noncontact state; a battery
13
disposed between the pickup
12
and the power receiving member
5
.
FIG. 12
is a control block diagram of the power supplying device for an elevator, having the above-described features.
The power supplying device for an elevator comprises a inverter power supplying member
10
, a power feeding line
11
connected to the inverter power supplying member
10
, a pickup
12
approaching the power feeding line
11
in a noncontact state, and a power receiving member
5
electrically connected with the pickup
12
.
The power receiving member
5
comprises a rectifying circuit
31
for rectifying the outputs received by the pickup
12
, a stabilization circuit
32
for stabilizing the rectified outputs, a smoothing circuit
33
for smoothing the stabilized outputs, and a control circuit
34
for exercising various controls by the smoothed outputs.
As shown in
FIG. 13A
, the inverter power supplying member
10
has a DC driving circuit
40
, and a switching circuit
41
for converting the DC voltage of the DC driving circuit
40
into AC voltage. The inverter power supplying member
10
outputs the AC voltage converted by the switching circuit
41
to the power feeding line
11
.
Meanwhile, no example has been found in which the above-described pickup
12
is applied to a plural car elevator. As shown in
FIG. 13B
, however, a construction is suggested in which the first and second pickups
12
a
and
12
b
of the respective plural cars
1
a
and
1
b
enter in series in the power feeding line
11
.
In a plural car elevator, one of the cars may be out of operation, and a cooler is turned on or turned off depending on a car, or the like. That is, there are variations in the load between cars. In this case, since the first and second pickups
12
a
and
12
b
enter in series in the power feeding line
11
, and the voltage is divided between the pickups
12
a
and
12
b
, the load causes a fluctuation in of one of the cars
1
a
fluctuates the voltage applied to the other car
1
b
. Also, in each of the cars
1
a
and
1
b
, the current flowing through the power feeding line
11
fluctuates in accordance with the load fluctuation.
Thus the power supplied to each of the cars
1
a
and
1
b
via the first and second pickups
12
a
and
12
b
is not stable.
As described above, in the power supplying device for a plural car elevator, having the above-described features shown in
FIG. 9
, when supplying power to the cars
1
a
and
1
b
using the cables
4
a
and
4
b
, there is a problem that, once the car
1
a
and
1
b
approach each other, the folded portion
80
a
of the first cable
4
a
of the first car
1
a
can make contact with the upper portion of the second car, so that the folded portion
80
a
of the first car can be caught on the second car, resulting in a reduction in the lifetime. Furthermore, for example, in order to obtain a bending curvature required for the cables
4
a
and
4
b
, it is necessary to secure a large space between the cars
1
a
and
1
b
, and the wall
101
of the hoistway
100
. This also raises a problem that the cross sectional area of the hoistway
100
increases, leading to a reduction in the space efficiency.
Moreover, when supplying power to plural car by the noncontact system using the pickups
12
a
and
12
b
, there is a problem that under the influence of the fluctuation of the power supply load to one of the cars, the amount of the power applied to the other car
1
b
fluctuates, thereby making it difficult to stably supply power to each of the cars.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to solve the above-described problems, and to provide a power supplying device for a plural car elevator, capable of preventing the cable of one car thereof from making contact with the other car, without increasing the size of a hoistway.
It is another object of the present invention to provide a noncontact-type power supplying device for a plural car elevator, capable of stably supplying power to each of the cars even if power supply load to each of the cars fluctuates.
The power supplying device for a plural car elevator in accordance with a fir

Affiliated with

Also associated with

Rating

Power supplying device for plural car elevator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Power supplying device for plural car elevator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power supplying device for plural car elevator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2597632