Wiring method of stator of rotating electric machine

A wiring method of a stator of a rotating electric machine is disclosed, wherein the stator has a plurality of first tooth portions and a plurality of second tooth portions, wherein one of the first tooth portions is located between two adjacent ones of the second tooth portions, wherein a slot is formed between the one of the first tooth portions and one of the second tooth portions adjacent to the one of the first tooth portions, wherein the slot is divided by a centerline extending toward an axis of the stator to form a first wiring region adjacent to the one of the first tooth portions and a second wiring region adjacent to the one of the second tooth portions, wherein the wiring method comprises:

• winding m-th layer of a first coil within the first wiring region in a first direction, wherein the first direction is from an outer-diameter side of the stator toward an inner-diameter side of the stator;
• winding (m+1)-th layer of the first coil in a second direction to overlay the m-th layer of the first coil, wherein the second direction is from the inner-diameter side of the stator toward the outer-diameter side of the stator;
• winding (n+1)-th layer of the first coil according to a manner that the (n+1)-th layer of the first coil would not slide off the stator when a closest distance between n-th layer of the first coil and the centerline is less than a threshold;
• winding m-th layer of a second coil within the second wiring region in the first direction;
• winding (m+1)-th layer of the second coil in the second direction to overlay the m-th layer of the second coil;
• winding n-th layer of the second coil, wherein a number of turns of the n-th layer of the second coil is equal to a number of turns of the n-th layer of the first coil minus two;
• sequentially winding from (n+1)-th layer of the second coil to a final layer of the second coil so as to fill the second wiring region and/or the first wiring region, wherein one of turns of the final layer of the second coil which is close to the outer-diameter side of the stator is located at an end position closest to the centerline within the second wiring region;
• and
• sequentially winding from (n+2)-th layer of the first coil to a final layer of the first coil within the slot so as to fill the first wiring region and/or the second wiring region.