Doubly-Fed Induction Motor Differential Cascade - Part I - Configuration and analysis in the steady state

In this paper the configuration and the analysis of a Doubly-Fed Differenti al Cascade (DFDC) in the steady state, is presented. The Doubly-Fed Differe ntial Cascade consists of two similar doubly-fed induction machines having the corresponding rotor phases connected. The stators are supplied by volta ge phason of variable frequencies. The rotor recovered slip power of the on e machine is used to supply the other machine, through the common rotor con nection, maintaining the sum of the two machine speeds constant and equal t o the difference of the two stator voltage phasor frequencies., The speed o f this differential cascade can be controlled by varying the frequency diff erence of the two stator voltage phasors. The direction of rotation can be changed by changing the sign of the frequency difference of the stators sup ply voltages. The set of two Doubly-Fed Induction Machines connected in a D ifferential Cascade may be used in electrical automobile drive systems.