Question

The induced emf in the armature conductors of a dc motor is

Answer 1

The induced emf acts in other way to the applied voltage V (Lenz’s law) and is understood as Back EMF or Counter EMF (Eb).

Explanation:

• Under the influence of the driving torque, the armature of a DC motor rotates, the armature conductors move through the magnetic flux and hence emf is induced in them as during a generator.
• The induced emf acts in other way to the applied voltage V (Lenz’s law) and is understood as Back EMF or Counter EMF (Eb).
• The back emf makes the DC motor a self-regulating machine, i.e., the rear emf develops the armature current consistent with the necessity of the motor.
• The induced EMF within the armature conductors of a DC motor is Sinusoidal.