Research of dual three induction machine with asymmetrical operation

The mathematical models of dual three phase induction machine in stationary reference frame are obtained, using the concept of vector space decomposition with loss of one stator winding excitation set. Because the machine is equivalent, from the point of view of electromechanical energy conversion, to a two phase machine with asymmetrical d-q windings, it must recur to further equivalent transformation to achieve models in the synchronous reference frame with symmetrical d-q windings. Under this condition it is possible to control the machine with field-oriented techniques and realize the stator currents vector modulation to keep rotating stator MMF round. These are verified by MATLAB simulation results.