The practical testing of dynamos and motors (1905)
Smith, Charles Frederick, 1873- · Manchester Scientific Pub. Co · leaf 251
ssary to determine thefriction losses. II. Remove the shmit resistance Rj (Fig. 75), andapply a low voltage to the machine, varying the voltage soas ■ to make the machine rotate at the same range ofspeeds as those previously observed. Read the armaturevoltage and current for each speed, and enter… … 200 400 600 Revolutions per minute. 800 1200 Fig. 76.—Curves Showing Losses in Series Motor. and that the power taken by the armature is only thatrequired to overcome the frictional losses. By plotting a curve of watts supplied to the armatureunder these conditions, we obtain the friction losses…
Dynamos · Electric motors
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
