Separately Excited DC Generator
A DC generators whose field winding or coil is energised by a separate or external DC source is called a separately excited DC Generator. The flux produced by the poles depends upon the field current with the unsaturated region of magnetic material of the poles. i.e. flux is directly proportional to the field current. But in the saturated region, the flux remains constant.
The figure of self-excited DC Generator is shown below.
Ia = IL where Ia is the armature current and IL is the line current.
Terminal voltage is given as
If the contact brush drop is known, then the equation (1) is written as
The power developed is given by the equation shown below.
Power output is given by the equation (4) shown above.
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