What do the terms pull-in, pull-out, full-load, break-down, and locked-rotor mean in regard to torque?
A—Pull-in torque is the maximum torque at which a synchronous motor can accelerate its load to synchronous speed. Pull-out torque is the maximum torque which 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 it will be at a speed slower than full-load speed. Locked-rotor or starting torque is the torque developed with the rotor at standstill.
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