Armature winding of rotating electrical machine

A 3-phase 2-pole 2-layer armature winding of a rotating electrical machine, housed in 72 slots provided in a laminated iron core, the winding for each phase comprising:

• six parallel circuits separated into two phase belts comprising first and second phase belts, each parallel circuit comprising two coil pieces, an upper coil piece and a lower coil piece connected in series with each other at a connection side coil end and at a non-connection side coil end;
• and
• the parallel circuits being connected such that upper and lower coil pieces of first and fourth parallel circuits are placed at 2nd, 5th, 9th, and 12th positions from the center of a pole;
• upper and lower coil pieces of second and fifth parallel circuits are placed at 1st, 6th, 10th, and 11th positions from the center of a pole;
• and upper and lower coil pieces of third and six parallel circuits are placed at 3rd, 4th, 7th, and 8th positions from the center of a pole, when relative positions of the upper and lower coil pieces in one phase belt are indicated by positions counted sequentially from the center of a pole.