On the equivalence of the two theories of the single phase induction motor

It is shown that the two equivalent diagrams of a single-phase induction motor, viz., the one deduced from the revolving-field theory and that from the cross-flux theory, can be converted into each other. In other words, the two theories lead to the same performance of a motor with given design constants. It is also shown that many other equivalent diagrams are possible and that one of these contains a variable impedance depending upon the slip in one parallel branch only, the other parts of the circuit being constant.