A stator comprising a stator core, wherein the stator core comprises a yoke and teeth, a slot is provided in the circumferential direction of the stator core between each two adjacent teeth, slot insulating paper is provided in the slots, and a three phase wire winding is provided in the slot insulating paper, wherein the wire winding is a flat-wire continuous wave-wound staggered winding, consisting of an incoming line end wire portion, an outgoing line end wire portion, and S-shaped wave wires continuously wound between the incoming line end wire portion and the outgoing line end wire portion, wherein the S-shaped wave wires comprise an effective side portion for placing in a stator slot, a straight wire portion located outside both sides of the slot body, and an end portion connected to the adjacent straight wire portion; wherein a staggered winding portion is provided in the S-shaped wave wires, and the staggered winding portion is arranged in a staggered manner between the wires in each phase of the wires (U, V, W) characterised in that each phase comprising a number a of coils in parallel (U 1 -U a, V 1 -V a, W 1 -W a) where a is an integer between 2 and 7, wound in adjacent slots to each other, so that the number of slots distributed per pole per phase, represented by parameter q, is equal to the number of coils in parallel per phase, represented by parameter a, the S-shaped wave winding is wound throughout the stator circumferential width with a slot pitch y, besides the staggered winding portion, where y=3q; where the transposition of the phase coil wires occurs in the staggered winding portion, and which covers a circumferential width of 2y adjacent slots in the middle of the entire S-shaped wave winding, for each parallel coil (U 1 - U a, V 1 -V a, W 1 -W a) of the U-phase, V-phase and W-phase windings in the staggered winding portion, taken in the same direction at an interval of one wave winding; in a U-phase wire, a pitch y 1 of a U 1 wire is set as: y 1 '=4q-1 and a pitch y a of a Ua wire is set as: y a =3q-1, in a V-phase wire, a pitch y 1 ' of the V 1 wire is set as: y 1 '=4q-1 and a pitch y a ' of a Va wire is set as: y a '=3q-1, in a W-phase wire, a pitch y 1 " of the W 1 wire is set as: y 1 "=4q-1 and a pitch y a " of a Wa wire is set as: y a "=3q-1 an incoming line end wire portion, an outgoing line end wire portion, and S-shaped wave wires continuously wound between the incoming line end wire portion and the outgoing line end wire portion, wherein the S-shaped wave wires comprise an effective side portion for placing in a stator slot, a straight wire portion located outside both sides of the slot body, and an end portion connected to the adjacent straight wire portion; wherein a staggered winding portion is provided in the S-shaped wave wires, and the staggered winding portion is arranged in a staggered manner between the wires in each phase of the wires (U, V, W) characterised in that each phase comprising a number a of coils in parallel (U 1 -U a, V 1 -V a, W 1 -W a) where a is an integer between 2 and 7, wound in adjacent slots to each other, so that the number of slots distributed per pole per phase, represented by parameter q, is equal to the number of coils in parallel per phase, represented by parameter a, the S-shaped wave winding is wound throughout the stator circumferential width with a slot pitch y, besides the staggered winding portion, where y=3q; where the transposition of the phase coil wires occurs in the staggered winding portion, and which covers a circumferential width of 2y adjacent slots in the middle of the entire S-shaped wave winding, for each parallel coil (U 1 - U a, V 1 -V a, W 1 -W a) of the U-phase, V-phase and W-phase windings in the staggered winding portion, taken in the same direction at an interval of one wave winding; in a U-phase wire, a pitch y 1 of a U 1 wire is set as: y 1 '=4q-1 and a pitch y a of a Ua wire is set as: y a =3q-1, in a V-phase wire, a pitch y 1 ' of the V 1 wire is set as: y 1 '=4q-1 and a pitch y a ' of a Va wire is set as: y a '=3q-1, in a W-phase wire, a pitch y 1 " of the W 1 wire is set as: y 1 "=4q-1 and a pitch y a " of a Wa wire is set as: y a "=3q-1