Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 690
armature and is expelledthrough the spaces between the coils by centrifugal force. Witha sectional armature and this system of ventilation, no trouble WESTON S DYNAMO ELECTRIC MACHINE. whatever is experienced from heating of the core or coils, al-though the development of heat in machines of this… … The great increase in the number of sections in the commutatorreduces the sparking at the brush contacts and prevents the cur-rent from discharging across from one brush to the other. Thenumber of sections formerly used was eight; in the present ma-chines, from forty-eight to one hundred and forty…
Electrical engineering
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