Dual Stator Winding Induction Machines (DSWIMs) which have two sets of three phase windings with unequal pole pairs in their stator and a standard squirrel cage rotor, have overcame the narrow speed operation region and circulating current problems exists in other types of dual winding machines. These advantages are resulted from the independent operation of their winding sets. The independent operation of winding sets will be guaranteed if the flux saturation is avoided. This paper proposes a novel reference frame angel determination technique which not only guarantees the flux saturation avoidance but also results in flux optimization in DSWIMs. Despite the pervious methods, the proposed method doesn\\\\\\\'t require position or speed sensor and it is easily applicable in various control schemes and in different reference frames. This method is implemented in a flux and torque vector control system for driving a 3.3kW DSWIM. The experimental results confirm the effectiveness of the proposed method. Moreover, by implementing the proposed method, the torque sharing between two winding sets is properly done according to the power rating of each of them.

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