Tooth-frequency eddy-current loss

A method of recording, by means of an oscillograph, the eddy currents in various parts of the cross section of a squirrel-cage-rotor bar is presented in this paper. From such records the magnitude of the power loss caused by eddy currents, and its variation with load, may be determined. A series of tests of this nature has been made; the results, which the author believes to be correct in general, show that the change of eddy-current loss with load is negligible, thus simplifying the determination of the composite stray-load loss of a squirrel-cage induction motor.