Electromagnetic generators fall into one of two broad categories, dynamos and alternators.
- Dynamos generate direct current, usually with voltage or current fluctuations, usually through the use of a commutator
- Alternators generate alternating current, which may be rectified by another (external or directly incorporated) system.
Mechanical:
- Rotor: The rotating part of an electrical machine
- Stator: The stationary part of an electrical machine
Electrical:
- Armature: The power-producing component of an electrical machine. In a generator, alternator, or dynamo the armature windings generate the electric current. The armature can be on either the rotor or the stator.
- Field: The magnetic field component of an electrical machine. The magnetic field of the dynamo or alternator can be provided by either electromagnets or permanent magnets mounted on either the rotor or the stator.
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