Q. What are the Constructional Features of DC Machines?

Adc generator ormotormay have asmany as four fieldwindings, depending on the type and size of the machine and the kind of service intended. These field windings consist of two normal exciting fields, the shunt and series windings, and two fields that act in a corrective capacity to combat the detrimental effects of armature reaction, called the commutating (compole or interpole) and compensating windings, which are connected in series with the armature. The type of machine, whether shunt, series, or compound, is determined solely by the normal exciting-field circuit connections. figure illustrates how various field windings are arranged with respect to one another in part of a cross section of a dc machine, whereas Figure shows the schematic connection diagram of a dc machine.