Chained Traction Drive – How Does It Work?
The chain traction drive is very common in home elevators. An electric motor and gearbox are used to move the chain to lift and lower the elevator car. Counterweights are used to offset the weight of the cab and load, allowing the system to work more efficiently.
The motor and gearbox is located at the top of the rail system. The drums are attached to an axle driven by the gearbox. The cables are attached to the cab. As the drums wind the cables, the cab moves upward. As the drums spool out the cable, the cab moves downward
The winding drum systems do not require a machine room as the motor/gearbox is located inside the hoistway This space savings is a benefit in home design. The winding drum units also run quieter than other home elevator drives.