Which component is primarily responsible for controlling elevator speed?

The component that is primarily responsible for controlling elevator speed is the controller unit. This unit monitors the elevator's operation, adjusting the speed based on the desired settings and conditions to ensure smooth acceleration and deceleration. It manages the power supplied to the motor driving the elevator, allowing for precise control over how fast the elevator moves up or down.

While servos are involved in motion control and may contribute to positioning, it is the controller unit that dictates overall speed through programming and feedback systems. Cables and pulleys are fundamental for the mechanical operation of the elevator but do not actively control speed. Safety brakes are critical for ensuring the elevator can stop in emergencies, but they do not influence the speed during regular operation.