Which of the following components is typically not part of a DC motor?

In a typical DC motor, the components include the commutator, stator, and windings. The commutator is vital for reversing the direction of current through the rotor windings, which allows for continuous rotation. The stator provides a stationary magnetic field, which interacts with the current flowing through the rotor windings to produce torque. The windings are essential as they generate the magnetic field when electric current passes through them.

The synchronous rotor is not a typical component of a DC motor. Synchronous rotors are generally associated with synchronous AC motors, which operate under different principles compared to DC motors. In a synchronous AC motor, the rotor rotates at the same frequency as the AC supply, in sync with the rotating magnetic field produced by the stator. Thus, it is not relevant to the construction or operation of a DC motor.