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A DC current is fed to the fi eld coils to produce an electromagnetic field. This c urre nt is typically obtained from an external source that provides voltage and current regulation for the generator system. Generator control systems are discussed later in this chapter. 

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## Armature 

The armature assembly of a generator consists of two primary elements: the wire coils (called windings) wound around an iron core and the commutator assembly. The armature windings are evenly spaced around the armature and mounted on a steel shaft. The armature rotates inside the magnetic field produced by the field coils. The core of the armature acts as an iron conductor in the magnetic field and, for this reason, is laminated to prevent the circulation of eddy currents. A typical armature assembly is shown in Figure 9-47 . 

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