Theory of the Induction Machine with Conducting Sleeve Rotor

An idealized induction machine, having a conventional stator wound for excitation from a 2-phase source and a rotor consisting of a conducting sleeve mounted upon a cylinder of laminated iron, is analyzed by electromagnetic field theory. Expressions for the developed electrical torque voltages induced in the windings are derived. The method of analysis includes "skin" effects, i.e., the effects of the variation of rotor current density with depth within the rotor conductor, and end effects due to closure of rotor current paths inside the air gap.