33.a. The maximum torque a motor can produce is called the A. locked-rotor torque. B. full-load torque. C. saturation torque. D. breakdown torque. 33.b. An a-c motor operating at a power-line frequency of 60 Hz has a synchronous speed of 900 rpm. The number of poles in this motor i A. 12 B. 4 C. 6 D. 8

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Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.