Why is friction important in traction elevators?

Friction plays a crucial role in the operation of traction elevators because it enables the cables to effectively grip the sheave. This grip is essential for the efficient transfer of force from the motor to the elevator car. When the motor turns the sheave, the friction between the sheave and the cables prevents slippage, allowing the elevator car to rise or descend smoothly and reliably. Without sufficient friction, the cables would not hold onto the sheave well enough to transmit the necessary force, leading to performance issues and potentially unsafe conditions.

Friction in this context is not primarily concerned with aesthetics or noise reduction, nor is it directly tied to minimizing wear on the cables. While those factors might be secondary benefits, the primary importance of friction in traction elevators lies in its ability to provide the necessary grip for safe and effective elevator operation.