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erregereinrichtung with schleifringen and buersten for transmission of high erregerstroeme, preferably for large synchronous innenpolmaschinen
erregereinrichtung with schleifringen and buersten for transmission of high erregerstroeme, preferably for large synchronous innenpolmaschinen
1,224,622. A.C. generators with D.C. excitation. LICENTIA PATENT - VERWALTUNGS-G.m.b.H. 12 June, 1968 [20 June, 1967], No. 27881/68. Heading H2A. A synchronous generator comprises two part-circuits 23, 24 each including a rectifier arrangement connected to supply excitation direct current to a rotary field winding 12 through two separate slip rings 13, 15 or 14, 16 co-operating with two separate brushes 19, 21 or 20, 22, each part-circuit having its own two brushes and slip rings whilst slip rings of the same polarity are connected together, and a current regulating system 29 which is common to both part-circuits and by differing currents therein is actuated to equalize such currents. In the embodiment shown, which is in fact 3-phase, the arrangements are bridges 25, 26 of diodes 27, the system comprises a differential current transformer 30 connected to a current transformer 32 in either part-circuit, and the supply is from either a transformer 18 regulated by variable resistor 28 or a 3-phase generator regulated on its excitation side. In Fig. 2, the bridges are of thyristors (33) providing via a voltage regulator (38) both the generator voltage regulating and the current equalization; the latter is effected by a regulating element (37) supplied by either D.C. converters (35, 36) or current transformers (39,40).
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