How is the escalator speed generally controlled?

The speed of an escalator is primarily controlled by adjusting the voltage supply to the motor. This method allows for precise regulation of the motor's performance, which in turn affects how fast the escalator steps move. Modifying the voltage can help to manage inertia and speed dynamics effectively, ensuring a smooth and safe ride for passengers.

The other methods listed are not standard practices for controlling escalator speed. Using a manual throttle, for example, is not typically feasible in automated systems like escalators, which are designed for consistent and reliable operation without the need for manual intervention. The angle of the escalator, while important for structural design, does not influence speed directly. Lastly, passenger weight detection is primarily involved in safety mechanisms, such as ensuring the escalator can handle the load but is not a method for controlling speed.