What is Better 6-phase motor or 3 phase motor?

Three phase motors are in extensive use even with newer technologies. Six phase motors with double delta or double Wye configuration are used in special applications but not in general purpose use.

The use of six-phase induction motor for industrial drives presents several advantages over the conventional three-phase drive such as improved reliability magnetic flux harmonic reduction, torque pulsations minimization, and reduction on the power ratings for the static converter. For these reasons, six-phase induction motors are beginning to be a widely acceptable alternative in high power applications. A typical construction of such drives includes an induction machine with a dual three-phase connection, where two three-phase groups are spatially shifted 30 electrical degrees, a six-leg inverter, and a control circuit. By controlling the machine's phase currents, harmonic elimination and torque-ripple reduction techniques could be implemented.