AN APPROACH TO THE DESIGN OF EQUIVALENT-CIRCUITS FOR THE ROTOR-AIR GAP BOUNDARY-LAYER OF A ROTATING INDUCTION MACHINE

Some elements of induction machine theory based on the principles of e lectrodynamics of moving media and Poynting's theorem have been studie d. Results of the theoretical work carried out on the boundary layer b etween the rotating rotor of an induction machine acid the air gap are given. Two types of equivalent circuit for the boundary layer are der ived: the first reduces to the conventional equivalent circuit for a s tationary model, and the second, besides a power source, incorporates a special power source converter. It is proposed that this ''source'' be called an ''electromechanical source'' denoted by a special symbol in the equivalent circuit of an induction motor. An equivalent circuit with the ''electromechanical source'' in a rotor branch is recommende d for use in the design of controlled induction motors and self-contai ned induction generators.