|
 A
passenger elevator is designed to carry people and
small packages. Passenger elevators capacity is
related to the available floor space. Passenger
elevators may be specialized for the service they
perform, including: Hospital emergency (Code blue),
front and rear entrances, double decker, and other
uses. Residential elevators may be small enough for
one person while some are large enough for more than
a dozen. Wheelchair, or platform lifts, a
specialized type of elevator designed to move a
wheelchair 6 ft (2 m) or less, often can accommodate
just one person in a wheelchair at a time with a
maximum load of 750 lb (340 kg).Cars may be ornate
in their interior appearance, may have audio visual
advertising, and may be provided with specialized
recorded voice instructions.
Generally
passenger elevators
are available in capacities from 1,000 to 6,000 lb
(455 to 2,727 kg) in 500 lb (230 kg) increments.
Generally passenger elevators in buildings eight
floors or less are hydraulic or electric, which can
reach speeds up to 200 ft/min (1.0 m/s) hydraulic
and up to 500 ft/min electric. In buildings up to
ten floors, electric & gearless elevators are likely
to have speeds up to 300ft/min to 500 ft/min (2.5
m/s), and above ten floors speeds begin at 500
ft/min (2.5 m/s) up to 2000ft/min (10 m/s).
The concern for
entrapping passengers requires all elevators to have
communication connection to an outside 24 hour
emergency service, automatic recall capability in a
fire emergency, and special access for fire
department use in a fire. Elevators are not an
acceptable means of escape during a fire and should
not be used by the public for this purpose.
MRL (Machine Room
less) Elevators
Machine-room-less elevators include machinery and
equipment into the hoistway or closets, doing away
the need for a separate machine room. Designed for
buildings between two and 30 stories,
this system employs a smaller sheave than
conventional geared and gearless elevators. The
reduced sheave size, together with a redesigned
machine, allows the machine to be mounted within the
hoistway itself—eliminating the need for a bulky
machine room on the roof. The machine–room-less
elevator is the result of technological advancements
that often allow a significant reduction in the size
of the electric motors used with traction equipment.
These newly designed permanent magnet motors (PMM)
allow the manufacturers to locate the machines in
the hoistway overhead, thus eliminating the need for
a machine room over the hoistway. This design has
been utilized outside the USA for at least 15 years
and is becoming the standard product for low to
low-mid rise buildings.
Machine-roomless elevators
are ideal for a variety of applications.
Benefits of the MRL
Elevator over Hydraulic elevators
Using
MRL elevator saves
a significant amount of energy (estimated at 70-80%)
as compared to hydraulic elevators. The power
feeders for the MRL are also significantly reduced
due to the more efficient design and the
counter-balancing provided with traction equipment.
The MRL elevators
reduce the cost and environmental concerns
associated with a buried hydraulic cylinder filled
with hydraulic oil. MRL elevator being a traction
elevator with all its components above ground, this
is not a concern for this equipment.
The MRL elevator
utilizes a gearless traction type machine, which
results in superior performance and ride quality
compared with hydraulic elevators. MRL’s can also
operate at faster speeds thus increasing the
perception of quality over a conventional hydraulic
elevator.
ADVANTAGES at a Glance
1) Gearless permanent magnet machine
2) Low top overrun
3) 1 m/s to 1.6m/s
speed range
4) 10 to 16 passenger
load range (680 - 1088kg)
5) Smooth ride (first
class roller shoe suspension)
6) Cabin finishes to
choice
7) Versatile landing
and car door configurations
8) Fast installation
methods and times
9) No machine room, No
ventilation problems, No vision windows etc
10) 1:1 roping system
A solid feel in the cabin
11) Earthquake
friendly with jigged guiding
12) Shallow pits etc
13) Small control
cabinet on upper level
14) 180 starts per
hour
15) Time and
Money-Saving Benefits-Long life cycle, Low running
cost, Easy installation and service Cost-efficient
elevator application
16)Totally integrated
system for greater reliability |
