Excitation (of an electric machine)

From International Dictionary of Marine Aids to Navigation
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The production of a magnetic field that is used to generate induced current or to provide motive power. The field may be produced by a permanent magnet or by a powered electromagnet.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM