Excitation (magnetic)
An electric generator or electric motor consists of a rotor spinning in a magnetic field.
The magnetic field may be produced by permanent magnets or by field
coils. In the case of a machine with field coils, a current must flow in
the coils to generate the field, otherwise no power is transferred to
or from the rotor. The process of generating a magnetic field by means of an electric current is called excitation.
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