Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 36
ngs of the two phases must, of course, be kept separate,hence the armature will have four terminals, or if it be a revolvingarmature it will have four collector rings. As must be evident the phase difference may be of any value between0° and 360°, but in practice it is almost always made 90°. ■ _-… … .A.—Dwgiim at three wire two phase current datriposabfe to -use a ■■ return con d u ci - • - • - ■ 4 ■- ~ .~ • —._*--*. -.«: ....... . _ ^ ._...._... ..... .. * * * _ * - * ~ .* _ * 1 - ~ .■ . • llt*rt of tlie two currents, differing by 90* in phase. o phase system requires four lines for its…
Electrical engineering
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