Novel formulation for optimized winding and core design for improved induction machine performance

This paper presents a new optimized winding and core design for improved performance of an induction machine. The performance improvement is attained by space harmonic reduction in the winding magnetomotive force (MMF). In the proposed design, the new conductor distribution of the winding and its slot positions are obtained by solving an optimization problem which maximizes the fundamental component of the MMF and reduces certain harmonic components in it, number of which depends on the number of slot per pole per phase. The novel formulation of the optimization results in the modified slot sizes while keeping the width of stator and rotor teeth same as that for the conventional machine. In the proposed design, for certain machine rating, when compared with conventional machine the active length of conductor and the amount of iron is unchanged. However, the winding overhang reduces which leads to copper saving (\(\approx \) 6.46%), less winding resistance (\(\approx \) 6.5%) and leakage reactance (\(\approx \) 7.69%) and finally resulting in decreased total copper losses (\(\approx \) 21.6%). Also, improvement in the steady-state torque and efficiency and decrease in the maximum flux density in core is obtained with the proposed machine design.