"self-excited" meaning in English

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  "etymology_text": "From self- + excited.",
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          "ref": "1961 October, “The first 1,250 h.p. Birmingham/Sulzer Type 2 diesels enter service”, in Trains Illustrated, page 607:",
          "text": "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.",
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        "Relating to a machine or system that generates or excites its own magnetic field."
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        "simple past and past participle of self-excite"
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        "Relating to a machine or system that generates or excites its own magnetic field."
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