self-excited

From self- +‎ excited

self-excited

1. Relating to a machine or system that generates or excites its own magnetic field.
   • 1961 October, “The first 1,250 h.p. Birmingham/Sulzer Type 2 diesels enter service”, in Trains Illustrated, page 607:

     The main generator, of type WT.981, is a 10-pole, single-bearing machine with four field windings - separately excited, self-excited, reverse series and starting. [...] Generator excitation is obtained by a combination of the separately-excited and self-excited fields, and the output is controlled by a resistance in the separate field circuit adjusted by the load regulator under the control of the engine governor.

self-excited

1. simple past tense and past participle of self-excite

• “self-excited” in Lexico, Dictionary.com; Oxford University Press.