International Library of Technology · Scranton, International Textbook Co. · leaf 510
three re-sistances 7\, J\, and 7\, asshown. When the mo-tor is being started, thephases are connected tothe points a, b, and c, and the resistance is fig. lers. gradually cut out as the motor runs up to speed,the resistance is all cut out, the phases are practicallyshort-circuited, as shown by the… … 3876 DESIGN OF ALTERNATING the use of collector rings. In all cases, however, where it isdesired to regulate the speed by the insertion of resistancein the secondary circuit, collector rings are necessary. 4247. When it is not desired to insert resistance in thesecondary circuit, a plain…
Electrical engineering
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