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 157
e-pendence of the coefficient of friction upon the commutator peripheralspeed is indicated by Fig. 144 for carbon brushes in good condition. 134 CALCULATIONS 125 To compute the watts lost through brush friction, multiply thetotal area of brush contact by the stress, i. e., the pressure per… … BeTipheTQl 5peedofCoTnmutatoT in Feet per Min. Fig. 143. Curves Showing Average Friction Loss per SquareInch of Brush Contact at Various Speeds and Brush Tensions Dividing by 33,000 changes this value into horse-power, and multi-plying by 746 converts the result thus obtained into watts.
Electrical engineering
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