In synchronous motors, ? have two winding types, salient pole windings and amortisseur windings.

• A. Stators
• B. Windings
• C. Rotors
• D. Armatures

Answer: (C)

Rotors carry two winding types in synchronous motors. A salient-pole rotor uses discrete pole pieces with windings wrapped around each pole to create distinct magnetic poles, which is common for machines that run at lower speeds and need high starting torque. The amortisseur, or damper, winding consists of shorted conductors embedded in the rotor, acting like a squirrel-cage. These windings aren’t part of the main excitation but serve to start the machine as an induction motor and to damp rotor oscillations. As the motor nears synchronous speed, the damper currents diminish and the rotor locks in with the stator’s rotating field, while the salient-pole structure sets the rotor’s permanent magnetic polarity.