Which component provides the stationary electromagnetic field in a revolving armature alternator?

The stator is the component that provides the stationary electromagnetic field in a revolving armature alternator. In this type of alternator, the stator consists of coils of wire that create a magnetic field when an electric current flows through them. This magnetic field remains fixed in place, while the rotor, which typically contains the armature, revolves within this stationary magnetic field. The interaction between the moving rotor and the stationary magnetic field induces alternating current (AC) in the stator coils, which is the fundamental operating principle of an alternator.

In contrast, the rotor is responsible for generating the rotating magnetic field, while the commutator serves to convert the generated AC current into direct current (DC) in certain types of machines. The term "generator" generally refers to the entire assembly that generates electrical power, so it is not specific enough to answer the question accurately. Thus, the stator's role in providing a stationary electromagnetic field is crucial for the operation of a revolving armature alternator.