Description
Most elevators, whether traction or hydraulic, require a machine room to store
large electric motors (or hydraulic pumps) and a controller cabinet. However,
modern day traction motors boasting gearless and permanent magnet drive can be
more compact and efficient because they use electronic microprocessors instead
of mechanical relays. As a result, traction elevators (A.K.A. Machine-Room-Less
or MRL elevators) can be built without a dedicated room above the shaft, saving
valuable space in building planning.
The new lift design presents a
departure from the traditional, looped over-the-top traction rope routing of
traction elevators. The ends of the cables are fixed to the supporting
structure, and the length of the cable are connected to the car and
counterweight by means of a force-multiplying, energy saving compound pulley
system. Machine Room-less elevators have become a welcome alternative to the
older hydraulic elevator for low to medium rise buildings.Machine-Room-Less (MRL) technology stands to bring rapid change to the elevator
industry. Times of change bring opportunity and the potential for tapping new
markets, serving new customers, and discovery of more profitable methods and
processes.
Advantages from a Green Perspective
- Creates more usable space
- Uses less energy (70-80% less than hydraulic elevators)
- Uses no oil
- All components are above ground
- Takes away the environmental concern that was created by the hydraulic
cylinder being stored underground
- Reduced costs
- Emerging best practices
Other Advantages
- Much lower cost than other elevators
- Ride quality is better due to gearless traction
- Operates at faster speeds than hydraulics
- Noise level is at 50-55 dBA (A-weighted decibels), which is much lower
than other types of elevators
Usually used for low-rise to mid-rise
buildings
- The motor mechanism is placed in the hoistway itself
Disadvantages
- Additional building structure
- Initial cost greater for 2-3 story buildings unless it is pre-engineered
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