a term used to describe any of a variety of rotating machines that
convert mechanical to electrical energy, or less commonly, electrical to
mechanical energy. Dynamos typically consist of a stationary structure,
called the stator, supporting a rotating element called the rotor.
Energy conversion occurs via Faraday induction. A field winding (or in
some smaller machines, permanent magnets) is mounted on one of the
mechanical structures and produces a magnetic flux.
An armature winding is mounted on the other structure, and rotation
of the rotor produces relative motion between the field flux and the
coils of an armature winding, inducing a Faraday voltage in the armature
coil. This Faraday induced voltage is the source of electrical energy
at the dynamo output.