What component commonly provides power to traction elevators?

Traction elevators rely primarily on an electric motor to provide power for their operation. This motor drives a sheave, which is a type of pulley that moves the suspension cables connected to the elevator car and its counterweight. As the electric motor rotates the sheave, it raises and lowers the elevator by either pulling the car upward or lowering it back down, allowing for smooth and controlled movement between floors.

Electric motors are essential in traction elevators because they provide the necessary torque and speed to handle the weight of the elevator car and its passengers, as well as the counterweight system that helps balance the load. This balance is critical for energy efficiency and safety. The design leverages the principles of physics where the counterweight, which is roughly equal to the weight of the elevator car, reduces the effort required by the motor.

In contrast, components like hydraulic pumps, counterweight systems, and manual cranks do not serve the same function in traction elevators. Hydraulic pumps are typically associated with hydraulic elevators, not traction systems, while counterweight systems assist but do not provide power. A manual crank would not be used in modern elevators, which rely on electric power for convenience, speed, and safety. Thus, the use of an electric motor is a defining characteristic of