Which component adjusts the speed of escalator operation?

The variable frequency drive (VFD) is the component responsible for adjusting the speed of escalator operation. A VFD controls the frequency and voltage supplied to the motor, allowing for precise regulation of its speed and torque. By varying these parameters, the VFD enables smooth acceleration and deceleration of the escalator, enhancing ride comfort and energy efficiency.

The motor control unit is a broader term that refers to the systems that manage the operation of the motor but does not exclusively handle speed adjustments. The gearbox, while essential for transmitting power from the motor to the escalator steps, does not directly influence the speed of operation. The power inverter typically converts DC power to AC, which is important for energy conversion but does not specifically control the speed of the escalator operation as a VFD does.