Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 446
resistances which are connected to the rotor windings bymeans of brushes rubbing on the collector rings. These adjustableexternal resistances arie regulated by a cylindrical switch or controllersimilar in general to the ordinary electric street-car controller.Fig. 345 shows a Westinghouse… … Fig. 344. Rotor with Polar Winding and Collector Rings ling the speed of the motor by varying the resistance in the secondarycircuits. The two sets of contacts on two drums are mounted onthe same shaft and all operations are performed by moving onecontroller handle. The number of speed steps in…
Electrical engineering
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