AC machine windings

A multi-phase electrical machine, comprising:

• a core comprising a number of slots;
• and
• an electrical winding installed in the number of slots of the core, the electrical winding comprising:
• a first wye-delta winding comprising a first wye winding and a first delta winding for each phase;
• and
• a second wye-delta winding comprising a second wye winding and a second delta winding for each phase;
• where the first and second wye windings for each phase are connected in series forming wye windings and the first and second delta windings are connected in series forming delta windings, and the wye and delta windings are connected in a wye-delta configuration thereby forming first and second wye-delta connected windings providing an electrical phase shift between the wye windings and the delta windings;
• and
• where the first and second wye-delta connected windings are interdigitated with the first wye-delta connected winding and the second wye-delta connected winding installed in alternating slots of the core thereby providing a physical shift between the first and second wye windings and the first and second delta windings.