International Library of Technology · Scranton, International Textbook Co. · leaf 291
method is that indicated by thediagram, Fig. 1521. PF represents the armature winding, 2664 THEORY OF ALTERNATING the terminals 7, T of which are connected to the col-lector rings R, R, connecting to the line by means of thebrushes g, h. The field is excited by a set of coils onthe pole-pieces… … FlG. 1521. able rheostat R is placed also in the alternator field circuit.When the voltage drops, the fields may be strengthened byadjusting the resistances R and r. This method, which isthat used with plain separately excited alternators, servesto keep the voltage right, and may be used with…
Electrical engineering
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