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 199
en machines operatedin parallel. The collectorrings for conveying throughbrushes the direct currentfor exciting the field coils,shown to the right in Fig.I7l, are of cast iron, insu-lated from the iron bushingover which they are shrunkby V-shaped mica. Anotherrotor construction is oftenemployed in… … Fig. 170. Rotor of Fig. 169 with Field Coils in Place 174 ALTERNATING-CURRENT MACHINERY 163 to a cast-steel or iron ring, which is connected to the hub by arms ofsuitable section, as shown in Fig. 172. The pole pieces are builtof sheet iron, spreading at the pole face so as to secure not only…
Electrical engineering
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