What is breakaway torque?

Breakaway torque refers specifically to the torque necessary to initiate movement in an escalator, particularly as it overcomes resistance such as from the brake system. This is a critical aspect of escalator operation because, when an escalator comes to a stop, it is often held in place by brakes that engage to prevent unintended movement. To start the escalator, the drive system must produce enough torque to break free from this holding position, which is what makes option C the correct choice.

Understanding breakaway torque is essential for ensuring that the escalator can start effectively and safely. It is distinct from other types of torque, such as the torque required to maintain constant speed or to stop the escalator, which involve different mechanical conditions and requirements.