What is the main reason for the voltage drop in a separately excited DC generator as the load is increased?

(3.3) (i). As the load current increases, the terminal voltage falls due to two reasons: (a) The armature reaction weakens the main flux so that actual e.m.f. generated E on load is less than that generated (E0) on no load. (b) There is voltage drop across armature resistance (= ILRa = IaRa).

How is the induced voltage of a separately excited DC generator affected if the speed increases?

In a separately-excited generator, an output voltage increase is proportional to an increase in the armature speed. A change in speed always results in a corresponding change in output voltage. An increase in field current increases the output voltage only if the field poles are not saturated.

How does an armature generate current?

In the armature, an electromotive force is created by the relative motion of the armature and the field. When the machine is used as a generator, the armature EMF drives the armature current, and the shaft’s movement is converted to electrical power. In an induction generator, generated power is drawn from the stator.

How do you increase armature current?

Armature current could be increased up to the rated, by which the speed could be increased up to rated, by varying applied voltage. Some general informations about shunt motor.

Does the speed of a separately excited DC motor increase or decrease when the armature current increases?

In the fifth part of the exercise, you will demonstrate that when the armature voltage ܧ஺ is set to a fixed value, the speed of the separately-excited dc motor decreases with increasing armature current or torque because of the increasing voltage drop across the armature resistor.

What is the role of armature in electric motor?

Armature – It is a rectangular coil that is placed in a uniform magnetic field. The main function of the armature is to rotate the shaft or axel to which it is attached.