The practical testing of dynamos and motors (1905)
Smith, Charles Frederick, 1873- · Manchester Scientific Pub. Co · leaf 246
ATION OF LOSSES. 231 A measurement of the power absorbed by brushfriction on the commutator may be made by takingreadings before uncouphng the dynamo and motor,first with the brushes of the dynamo down and then withthe brushes raised. The difference between the powertaken under these two conditions… … 900 1000 1100 1200 Revolutions per minute. Fig. 74.—Losses ix Dynamo. 1300 Ordinates of Curve III. Ordinates between Curve.s II. and III. Ordinates between Curves I. and III. Friction. Iron losses with IS amperes excitation.Iron losses with 25 amperes excitation. similar to those of the previous…
Dynamos · Electric motors
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
