Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 422
dotted lines. At this posi-tion the resistance is all cut out and the three rotor windingsare short-circuited by the arms of the switch. By using threeresistances, one in each i)hase of the rotor, and a short-cir-cuiting switch, as shown in Fig. 409. the resistance in eachphase is kept balanced,… … Fig. 469.—Balanced starting resistance for induction motor. In most cases satisfactory starting can be obtained byusing what is known as an unbalanced resistance, as shown inFig. 470. Two resistances B^ and R^ are connected in open Collec-hor Rings
Electric machinery
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