IEEE Transactions on Energy Conversion, Vol.35, No.4, 1727-1735, 2020
Improvement of Concentrated Winding Layouts for Six-Phase Squirrel Cage Induction Motors
The fault-tolerant capability is a prerequisite for electrical safety-critical applications. In this regard, multi-phase induction motors are well-known actuators used to provide this feature. Compared to conventional three-phase machines with distributed windings, induction machines having concentrated windings could be more fault-tolerant because of increasing the number of phases. In addition, concentrated windings have shorter end-winding and less required copper weight which makes it a lower cost solution compared to distributed windings. However, concentrated windings adversely increase the distortion of the air gap flux density which affects motor performances. In this paper, a pseudo-concentrated winding layout has been proposed for six-phase squirrel-cage induction motors to improve performances compared to conventional concentrated windings. Winding function and equivalent circuit methods are used to analytically calculate performances. Finally, time-stepping finite element method and experimental measurements have been presented to confirm obtained analytical results.
Keywords:Windings;Induction motors;Air gaps;Layout;Harmonic analysis;Stator windings;Squirrel-cage induction machine;symmetrical six-phase system;concentrated winding;pseudo-concentrated winding;distributed winding;fault-tolerance;winding function analysis;analytical modeling;performance calculation;finite element analysis