What do the terms pull-in, pull-out, full-load, break-down and locked-rotor mean concerning torque?
A – Pull-in torque is the maximum torque at which a synchronous motor can accelerate its load to synchronous speed. Pullout torque is the maximum torque that a synchronous motor can develop and still maintain synchronous speed. Full-load torque is the torque developed by a non-synchronous motor at its rated full-load speed. Break-down torque is the maximum torque that the motor can develop. With a synchronous motor, this will be at a speed slower than synchronous speed and with a non-synchronous motor this will be at a speed slower than the full-load speed. Locked-rotor or starting torque is the torque developed with the rotor at standstill.
