Machine-Room-Less (MRL) Elevators
  • 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 hoist way 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 hoist way 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 hoist way overhead, thus eliminating the need for a machine room over the hoist way. 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-room less elevators is ideal for a variety of applications.
Benefits of the MRL Elevator over Hydraulic elevators
  • The use of the MRL elevator will save 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 elevator eliminates the cost and environmental concerns associated with a buried hydraulic cylinder filled with hydraulic oil. Over the years hydraulic elevators have come under greater scrutiny relative to environmental concerns due to the buried hydraulic cylinder. Because the MRL elevator is 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 of the MRL Elevator over Hydraulic elevators
  • Gearless permanent magnet machine
  • Low top overrun
  • 1 m/s to 1.6m/s speed range
  • 10 to 16 passenger load range (680 – 1088 kg)
  • Smooth ride (first class roller shoe suspension)
  • Cabin finishes to choice
  • Versatile landing and car door configurations
  • Fast installation methods and times
  • No machine room, No ventilation problems, No vision windows etc
  • 1:1 roping system A solid feel in the cabin
  • Earthquake friendly with jigged guiding
  • Shallow pits etc.
  • Small control cabinet on upper level
  • 180 start per hour
  • Time and Money-Saving Benefits-Long life cycle, Low running cost, Easy installation and service Cost-efficient elevator application
  • Totally integrated system for greater reliability