Traction machine
Also called lift machine · Korean 권상기, 구동기, 트랙션 머신
A traction machine, called a lift machine in the standard, drives and stops the elevator.Korean Elevator Safety Standard, Annex 22 3.4 A traction machine consists of a motor, gear, brake and sheave, and the ropes are driven by friction in the grooves of the machine's traction sheave.Korean Elevator Safety Standard, Annex 22 3.4, 3.6
The Korean name 권상기 comes from the 1998 elevator inspection standard and is also used in D&D user manuals. The current standard uses 구동기.KATS Notice 98-75, Elevator Inspection Standard (1998) · D&D user manual MONA
Structure and types
- PartsMotor, gear, brake, and a sheave, sprocket or drum.Korean Elevator Safety Standard, Annex 22 3.4
- GearedA reduction gear turns the traction sheave.Annex 3 4.1.1
- GearlessThe traction sheave is turned directly, without reduction.Annex 3 4.1.2 Gearless ›
- RopingThe way the ropes are reeved over the sheaves. The Traction Ratio (1:1, 2:1) in D&D specification tables is the roping ratio.Korean Elevator Safety Standard, Annex 22 부속서 Ⅹ 그림 Ⅹ.2 · D&D specification tables Roping ›
D&D products
23 Traction Machine (TM), load capacity 320~5,000kg, 13 certificates. Specifications and drawings are on each product page.D&D public catalog
MCK200 [Ø400] 1:1Slim Type · 320~630kg
MDD410B [Ø410] 1:1Double Wrap · 500~1,150kg
MONA320 [Ø240] 2:1Pencil Type · 320~1,275kg
MGD100C [Ø100] 2:1Belt Type · 320~1,150kg
Similar Korean terms
- 권상장치
- This word appears neither in D&D documents nor in the Korean elevator safety standard. D&D calls its machines 권상기, and the current standard calls the unit 구동기 (lift machine).D&D user manual MONA · Korean Elevator Safety Standard, Annex 22 3.4 In the crane standard, 권상장치 is the crane mechanism that raises and lowers loads.Crane Manufacturing and Safety Standard, Annex 2
- 권상용량
- This word appears neither in D&D documents nor in the standard. The D&D catalog gives the load the car can carry as Load Capacity (kg), and lists traction capability separately as the condition that keeps the ropes from slipping on the sheave.D&I traction machine catalog 7쪽 The nearest value in the standard is the rated load, the designed load of the elevator.Korean Elevator Safety Standard, Annex 22 3.44
- 권상능력
- Traction capability is a friction condition, not a weight. With 125% of the rated load in the car, the ropes must not slip at the landing, and emergency braking must slow the car to the buffer design speed or below.Korean Elevator Safety Standard, Annex 22 9.3.1
Related terms
Related articles
D&D technical articles that discuss Traction machine. Articles are not used as sources for the definition.
Traction Machine (TM) enquiriesWeekdays 09:00 to 18:00 KST, by phone or enquiry form.
Sources
- Annex 22: MOIS Notice 2022-18, Elevator Safety Standard, Annex 22 (KC 2050-51:2022). English terms are the ones printed in brackets in Annex 22.
- Elevator Inspection Standard: KATS Notice 98-75 (1998, repealed).
- D&D traction machine user manuals (MCK, MONA and MGD100C series, support document library).
- Annex 3: same notice, Annex 3, lift machine safety standard (KC 1030-02:2022).
- D&D product specification tables (public catalog).
- Crane Manufacturing and Safety Standard, Annex 2.
- D&I Catalog, Traction Machines (E-catalog).
- D&D public catalog
