International Library of Technology · Scranton, International Textbook Co. · leaf 349
st to have a resistance which maybe placed temporarily in the circuit and then cut out. Thismay be done by supplying the secondary with a regularwinding similar to that of the field, and bringing the termi-nals to collector rings. By means of these, connection maybe made to a resistance-box, and… … Fig. 1572.armature spider, and cutting it out by a switch operated bya sliding collar on the shaft. This enables the motor to bebuilt without any moving contacts whatever. CURRENT APPARATUS. 2723 4044. In cases where it is necessary to have inductionmotors run at variable speeds, it is usual to…
Electrical engineering
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