Schematic Diagram Separately Excited Dc Generator. A dc generator whose field winding or coil is energised by a separate or external dc source is called a separately excited dc generator. The steady state model of the separately excited dc generator is shown in fig.
The external characteristic of the separately excited dc generator is obtained by subtracting the drops due to ohmic loss i a r a in the armature from generated voltage e g. These are generators in which the field winding is excited by the output of the generator itself. Flux is directly proportional to the field current.
The positions of the brushes of dc generator are so that the change over of the segments a and b from one brush to other takes place when the plane of rotating coil is at a right angle to the plane of the lines of force.
A circuit diagram of separately excited dc generator is shown in the figure below. The external characteristic of the separately excited dc generator is obtained by subtracting the drops due to ohmic loss i a r a in the armature from generated voltage e g. Separately excited dc motor. Terminal voltage v e g i a r a.
