DC Motor Operation



 

          In a dc motor, the stator poles are supplied by dc excitation current, which produces a dc magnetic field. 

          The rotor is supplied by dc current through the brushes, commutator and coils. 

          The interaction of the magnetic field and rotor current generates a force that drives the motor

          Before reaching the neutral zone, the current enters in segment 1 and exits from segment 2,

           Therefore, current enters the coil end at slot a and exits from slot b during this stage.

           After passing the neutral zone, the current enters segment 2 and exits from segment 1,

          This reverses the current direction through the rotor coil, when the coil passes the neutral zone.

           The result of this current reversal is the maintenance of the rotation.


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