Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 610
the ring taken through one of these portions. Theintermediate thicker portions of the ring are grooved by a seriesof deep concentric channels, partly to reduce the mass and lessenthe weight of the revolving armature, and partly for ventilatingthe ring and carrying away a portion of the heat… … Fig. 384. rents are effectually cut off and induction currents are com-pelled to flow in directions which are not detrimental to theefficiency of the machine. This again increases the area ofradiating or cooling surface, and consequently helps to preventthe armature becoming overheated. In the…
Electrical engineering
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