When N is generator speed (rpm), f is generator frequency (Hz) and P is numbers of pole (poles), Coil
Span is angle range of coil from count from first coil side to end coil side (unit measurement maybe use
slot or degree), Coil group is number of sub coil that distributed in coil span of a big coil, Total Slot is
total numbers of slot on stator core (slots), Pole or P is magnetic pole (poles), Phase is number of phase
system, is slot angle in each slot, (electrical degree), Angle is the angles for installation coil at each slot.