When an unexcited synchronous motor fails to reach synchronous speed and runs as an induction motor, what does it draw?

When an unexcited synchronous motor fails to reach synchronous speed and operates as an induction motor, it draws more than its rated current. This condition occurs because the rotor is unable to synchronize with the rotating magnetic field produced by the stator. As a result, the motor goes through a phenomenon similar to that of an induction motor, where it requires additional current to create enough torque to overcome the mechanical load.

In this scenario, the rotor must slip to generate torque, which means that the motor operates in a way that requires a higher current draw to maintain the necessary magnetic interaction and to allow the rotor to catch up with the magnetic field. The increased demand for current can lead to overheating and inefficiency, making it vital to monitor these conditions in practical applications.