Abstract: The stator assembly of the present application includes a multi-phase winding and a stator core being provided with a stator slot. A branch includes a first coil group, a second coil group and a connecting wire. The first coil group includes N first winding parts and N-1 first variable-layer lines, and the first winding part includes a plurality of coil sets, the coil set includes a first cross-layer unit and a first variable-pitch unit; a span of the first variable-pitch unit is greater than or less than the pole pitch of motor; the first variable-layer line connects two adjacent first winding parts, and a span yl of the first variable-layer line is set as: y?2?yl<y+2; the second variable-layer line connects with two adjacent second winding parts, and a span y2 of the second variable-layer line is set as: y2=y.

Abstract: A motor stator includes a stator core having a stator slot, and a stator winding inserted into the stator slot. Each stator slot includes slot layers. The stator winding includes first and second conductors each including two straight segment parts. The straight segment parts of the first conductors are separately located at two adjacent slot layers. One straight segment part of the second conductor and one straight segment part of the first conductor are located in a same stator slot. A pitch of the first conductor is y1, a pitch of the second conductor is y2, a pole pitch of the stator winding is ?, a distance between straight segment parts of two adjacent first conductors at a same slot layer is L1, a distance between straight segment parts of two adjacent second conductors at a same slot layer is L2, and the followings are met: y1=?, L1=? or L1=y2, and L2=?.

Abstract: A motor stator includes a stator core having stator slots, and a stator winding inserted into the stator slots. Each stator slot includes slot layers. The stator winding includes first and second conductors each including two straight segment parts. The straight segment parts of the first conductors are separately located at two adjacent slot layers. One straight segment part of the second conductor and one straight segment part of the first conductor are located in a same stator slot. A pole pitch of the stator winding is ?, a size of a pitch of the second conductor is y2, a distance between straight segment parts of two adjacent first conductors at a same slot layer is L1, a distance between straight segment ends of adjacent second conductors at a same slot layer is L2, and the followings are met: L1=?+1 or L1=??1, and L2=2??y2.