What type of motor is commonly found in escalators?

Induction motors are commonly used in escalators due to their robustness and efficiency. These motors are particularly suitable for applications that require constant speed and minimal maintenance, which makes them ideal for the continuous operation of escalators. Induction motors work by utilizing electromagnetic induction to generate motion, allowing them to handle heavy loads effectively, such as the weight of many passengers on an escalator.

This type of motor also offers high starting torque, which is important for escalators as they need to begin movement smoothly and reliably. The design of induction motors enables them to operate well under various load conditions, ensuring that escalators can function efficiently over long periods without overheating or requiring frequent repairs.

In contrast, while stepper motors, servo motors, and brushless DC motors have specific advantages in other applications, they are less common in escalator systems due to factors such as complexity, cost, and the need for more precise control than what is required for the standard operation of an escalator. Thus, the induction motor stands out as the preferred choice for this application.