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Mid-rise apartments
Once stops pass the hydraulic range, traction is the usual mid-rise apartment path — with an overhead machine room or MRL.
Drive system
Traction elevator
A traction elevator moves the cabin with steel ropes over a motor-driven sheave and a counterweight. It is the usual choice for mid-rise and high-rise buildings with heavier traffic. Atlas Asanbar Arsh designs and installs in Tehran, Karaj, and cities across northern Iran.
- Mid- and high-rise
- Typical travel range
- Counterweight
- Motor moves the difference
- Higher speed
- Suited to heavy traffic
System anatomy
What is a traction elevator and how does it work?
A traction cabin moves on steel ropes over a motor-driven sheave, not on an oil jack. The counterweight sits on the other side; the motor mostly moves the difference, not the full car and load. Motor and sheave are usually overhead, unless the layout is MRL and the drive sits in the shaft.
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Motor and sheave
An electric motor turns the sheave; the ropes ride over it. Geared or gearless is a later choice inside the traction family.
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Steel ropes
Steel ropes link the cabin to the counterweight. Some projects use belts; in the Iranian market, wire rope is more common.
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Counterweight
Typically about 40–50% of car plus rated load. The motor does not lift the full car; it moves the difference. There is no hydraulic jack.
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Machine room or MRL
An overhead machine room is a layout choice. MRL is still traction — the drive sits in the shaft and the separate room is dropped. That is not hydraulic.
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Cabin
The passenger car. Finish and size come from catalog or custom specs — independent of the drive system.
A rooftop machine room is a layout, not the drive itself. MRL is still traction — it simply has no separate room. Geared or gearless is the motor type, decided after you choose traction. We settle that after measuring the shaft — not from a brochure.
You pick the cabin separately from the drive — catalog or custom. The quote comes after the site visit; stops, capacity, geared or gearless, machine room or MRL, and shaft condition move the number.
Use cases
Which projects suit traction elevators?
Traction fits a building that has moved past villa height and needs the lift to keep up at peak hours. Mid-rise apartments, towers, offices, and clinics — those are usually the jobs.
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Towers and high-rise
As height grows, the traction family keeps going. Residential and office towers usually sit on this drive — not on a hydraulic jack.
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Overhead machine room
Classic traction layout: motor and sheave in a room above the shaft. If the roof has no room, we look at MRL separately — same family, different layout.
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Busy office and medical traffic
Where the lift must run fast at peak hours, hydraulic speed is usually not enough. Traction is built for that traffic.
If headroom and pit allow, overhead machine room or MRL are both on the table — layout is separate from the drive. Do not push this system on a low villa with tight overhead — hydraulic is the better fit.
An honest picture
Traction elevator advantages and limits
On mid-rise and tower work, traction does a few things well: higher speed, busy traffic, and a path that keeps going when hydraulic is no longer economical. The counterweight helps the motor avoid lifting the full car. Those points hold when the shaft has pit and overhead.
Advantages
Higher speed than hydraulic
Traction is built for buildings where the lift must run fast at peak hours — offices, clinics, and busy residential.
Practical past six–seven stops
Past about 6–7 stops, hydraulic efficiency typically drops. That is a guide, not a law; for towers the practical path is usually traction.
Counterweight and energy
Because the counterweight offsets part of the load, the motor does not lift the full car. Versus raising the whole weight, energy use is typically more reasonable — not a fixed saving for every job.
Scales to towers
As stops and travel grow, the traction family keeps going. Hydraulic is not built for that range.
Limits
Pit and overhead are required
Traction usually needs an overhead machine room, or MRL with pit and overhead provisions in the shaft. Without that space the path is not practical.
More moving parts
Ropes, sheave, and brake need periodic service. The electrics must be checked on both drives. Traction means inspecting moving parts — not a no-service machine.
Villas with tight overhead
If headroom is short or the pit is shallow, traction is not always possible. On a 2–6 stop villa with a side machine room, hydraulic is often the only practical path.
Cost and noise depend on the job
Traction is not always cheaper than hydraulic over the long term, and not always quieter. Cost and sound depend on stops, motor, layout, and service.
Better to name the limits in the first meeting. Without pit and overhead, traction does not go forward; sometimes hydraulic is the only option. Ropes, sheave, and brake need inspection. If someone says traction is always cheaper or always quieter, ask on which building.
Choosing a drive
Traction or hydraulic — which fits your project?
If your building is mid-rise or tall, or you need higher speed or heavy traffic, traction is a strong option. For up to 6 stops, a villa, or limited overhead, look at hydraulic.
Stops
Traction
Suited to mid-rise and taller; often from about 6–7 stops up
Hydraulic
Typically 2–6 stops
Machine room and overhead
Traction
Usually overhead, or MRL in the shaft — pit and overhead needed
Hydraulic
Beside shaft, grade, or basement — no rooftop
Speed
Traction
Higher; heavy traffic
Hydraulic
Calm; moderate traffic
Retrofit
Traction
When overhead and pit depth allow
Hydraulic
Often the only practical path when overhead and pit are tight
Read the table against your building, not against which system is “better.” An eight-stop tower, or a busy office lift, is usually traction. A four-stop villa with tight overhead is almost always hydraulic. In a retrofit there is sometimes no choice: pit and headroom will not allow traction.
Project path
From survey to traction elevator handover
A traction install does not start with picking a cabin finish. First we see the shaft, pit, overhead, power, and where a machine room or MRL can sit. Without those measurements, two quotes cannot be compared.
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Survey and system selection
Shaft, pit, and overhead survey; capacity; then machine room or MRL, geared or gearless.
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Design and quote
Execution drawings, cabin and traction component selection, and a transparent phased quote.
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Supply and installation
Rails, ropes, sheave, counterweight, doors, and cabin; controller wiring per approved drawings.
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Testing and handover
Safety tests, speed and leveling adjustment, inspection prep, and owner handover briefing.
After the survey, drawings and a phased quote follow: design, supply, install, handover. Exact timing depends on shaft readiness and equipment lead time. After testing we also coordinate the technical inspection. Handover means the lift works and inspection paperwork is moving — not just a cabin on rails.
How quotes are built
How is traction elevator pricing calculated?
There is no fixed traction price. Two eight-stop buildings can get very different quotes; usually one has a gearless motor and a simpler cabin, the other MRL, heavier steelwork, or more landing doors.
- Stops and travel
- Stop count and travel height set rope length, rails, and motor power.
- Capacity
- Passenger or freight load drives motor, counterweight, and shaft structure choices.
- Geared or gearless
- Motor type sits inside the traction family — after the drive choice. It moves price, sound, and service.
- Machine room or MRL
- Overhead room or drive-in-shaft — a layout, not a different drive. It changes steelwork and overhead.
- Cabin and doors
- Cabin materials, size, and landing-door type change the quote directly.
- Shaft steelwork and brands
- Steelwork, motor and controller brands, and site access move the number. Accurate quotes only after a survey.
We write the number after the survey. Stops and travel change rope length; capacity sits on the motor and counterweight; cabin and doors come from the catalog and move the figure there. If you only heard a lump sum, ask whether shaft steelwork, landing doors, and delivery are inside it.
Project proof
Projects with traction systems
A few projects where a traction system is in place — a tower, a mid-rise office, and a medical complex. Open a card for the details of each job.
Common traction elevator questions
Before a site visit the same questions come back: what traction is, how it differs from hydraulic, from how many floors, what MRL and gearless mean, where the machine room sits, where price comes from, whether it fits a villa. Short answers are here; numbers and drawings come after the shaft is measured.
What is a traction elevator?
A system that moves the cabin with steel ropes (or belts) over a motor-driven sheave, with a counterweight on the other side. There is no hydraulic jack. Overhead machine room or MRL, and geared or gearless motor, are later choices inside this family.
How does traction differ from hydraulic?
Traction uses ropes and a counterweight; hydraulic uses a jack and oil. Traction fits mid-rise, towers, and heavy traffic better. Hydraulic is typically for villas and 2–6 stops with a side machine room. Neither is always better.
From how many floors is traction usually recommended?
In the Iranian market hydraulic is often discussed for 2–6 stops; past about 6–7 stops traction is usually recommended. That is a guide, not a law. The final call depends on shaft, overhead, and traffic.
How does traction differ from MRL and gearless?
Traction is the drive type. MRL is where the motor sits — equipment in the shaft, no separate room; it is still traction, not hydraulic. Gearless is the motor type — no gearbox; it comes after you choose traction. Do not treat the three as one.
Does a traction elevator need a machine room?
In the classic layout, yes — a room above the shaft. If the roof has no space, MRL puts the drive in the shaft and drops the separate room. Both still need pit and overhead. That is not the same as a hydraulic side machine room.
How much does a traction elevator cost?
There is no fixed price. It depends on stops, capacity, geared or gearless, machine room or MRL, cabin, doors, shaft steelwork, and equipment brands. Atlas Asanbar Arsh gives a transparent quote after survey. If you only heard a lump sum, ask what is inside it.
Is it suitable for a villa?
Not always. A 2–4 stop villa with tight overhead and a shallow pit is usually hydraulic — sometimes the only practical path. If height and shaft allow, traction can still work. The call comes after the shaft survey, not from the drive name.
Related types
If a traction elevator is not the right fit
Traction is a drive family, not a single model. If height is low and overhead is tight, look at hydraulic. If there is no rooftop machine room, look at MRL. If the motor type is the question, look at gearless.
Hydraulic elevator
A hydraulic elevator uses a jack and power unit to move the cabin. It suits villas and 2–6 stop buildings that cannot put a machine room on the roof. Atlas Asanbar Arsh designs and installs in Tehran, Karaj, and cities across northern Iran.
MRL elevator
An MRL elevator has no separate rooftop machine room. The drive usually sits in the hoistway on a support beam; the controller is often a cabinet at the top landing. It is common in Iran for mid-rise apartments and retrofits with a tight roof. Atlas Asanbar Arsh designs and installs in Tehran, Karaj, and cities across northern Iran.
Gearless elevator
A gearless elevator uses a motor without a gearbox — usually a permanent-magnet synchronous machine coupled straight to the traction sheave. It is common on mid- and high-rise work, but it is not the same as MRL: it runs with a machine room or without one. Atlas Asanbar Arsh designs and installs in Tehran, Karaj, and cities across northern Iran.
Related resources
Traction elevator guides and related services
Once the drive type is clear, continue from here to installation, the comparison with hydraulic, or the types directory.
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