Electric motor stator and electric motor

1. An electric motor stator, comprising:

a stator core, being provided with a plurality of stator core slots, wherein the plurality of stator core slots are formed on a radial inner surface of the stator core and are separated by a preset slot distance in a circumferential direction of the stator core; and

a stator winding, mounted on the stator core, wherein

the stator winding is provided with Q pole pair coils, wherein Q/a number of slots per pole per phase=P, P being an integer; wherein the stator winding is a three-phase winding, and the number of slots per pole per phase is 3; and

the stator winding comprises a first coil set and a third coil set that are successively sleeved from outside to inside, wherein

the first coil set comprises a plurality of first segmented coil units, and any one of the plurality of first segmented coil units is provided with two hair-pin coils with different pitches;

the plurality of first segmented coil units of the first coil set are successively arranged at a same layer in the stator core slots in the circumferential direction of the stator core;

the third coil set comprises a plurality of third segmented coil units, and any one of the plurality of third segmented coil units is provided with hair-pin coils with a same pitch;

the plurality of third segmented coil units of the third coil set are successively arranged at a same layer in the stator core slots in the circumferential direction of the stator core; and

the pitches of the hair-pin coils in each first segmented coil unit are different from the pitches of the hair-pin coils in each third segmented coil unit;

the stator winding further comprises a second coil set disposed between the first coil set and the third coil set, wherein the second coil set comprises a plurality of second segmented coil units, any one of the plurality of second segmented coil units is provided with two hair-pin coils with different pitches, or, any one of the plurality of second segmented coil units is provided with hair-pin coils with a same pitch; and

the plurality of second segmented coil units of the second coil set are successively arranged at adjacent two layers in the stator core slots in the circumferential direction of the stator core;

each first segmented coil unit comprises one long-pitch hair-pin coil and two short-pitch hair-pin coils, or, each first segmented coil unit comprises two long-pitch hair-pin coils and one short-pitch hair-pin coil.

2. The electric motor stator as claimed in claim 1 , wherein the pitches of the hair-pin coils of each second segmented coil unit are the same as the pitches of the hair-pin coils of each first segmented coil unit.

3. The electric motor stator as claimed in claim 1 , wherein the pitches of the hair-pin coils of each second segmented coil unit are the same as the pitches of the hair-pin coils of each third segmented coil unit.

4. The electric motor stator as claimed in claim 1 , wherein each third segmented coil unit comprises a hair-pin coil with a diameter pitch.

5. The electric motor stator as claimed in claim 1 , wherein each hair-pin coil of each segmented coil unit in each coil set of the stator winding comprises a first slot outer end portion, a first slot inner portion, a first slot outer turning portion, a second slot inner portion, and a second slot outer end portion that are successively connected, wherein the first slot inner portion and the second slot inner portion are located in different slots, the first slot outer turning portion of each hair-pin coil of each segmented coil unit in each coil set of the stator winding is located on a side of an end surface of the stator core, and the first slot outer end portion or the second slot outer end portion of each hair-pin coil of each segmented coil unit in each coil set of the stator winding is located on a side of the other end surface of the stator core.

6. The electric motor stator as claimed in claim 5 , wherein the first slot outer end portion and the second slot outer end portion of each hair-pin coil of each segmented coil unit of the first coil set have a same extending direction in the circumferential direction of the stator core, the first slot outer end portion and the second slot outer end portion of each hair-pin coil of each segmented coil unit of the third coil set have a same extending direction in the circumferential direction of the stator core, and the first slot outer end portion of each hair-pin coil of each segmented coil unit of the first coil set and the first slot outer end portion of each hair-pin coil of each segmented coil unit of the third coil set have opposite extending directions in the circumferential direction of the stator core.

7. The electric motor stator as claimed in claim 5 , wherein a slot inner portion of each hair-pin coil of each segmented coil unit of the stator winding and a slot outer end portion connected with the slot inner portion and extended in the circumferential direction are located at a same layer of the stator core.

8. The electric motor stator as claimed in claim 7 , wherein each slot outer end portion of each hair-pin coil of each segmented coil unit in each coil set of the stator winding and a slot outer end portion radially adjacent to the each slot outer end portion extend in opposite directions in the circumferential direction of the stator core.

9. The electric motor stator as claimed in claim 5 , wherein the first slot outer end portion and the second slot outer end portion have extending ends, and except the extending ends connected with lead wires, an extending end of a N−1 layer and an extending end of a N layer in a same radial direction of the stator core are connected, the extending end of the N layer is adjacent to the extending end of the N−1 layer, wherein N is an even number.

10. An electric motor, comprising a rotor and the electric motor stator as claimed in claim 1 .

11. The electric motor as claimed in claim 10 , wherein the pitches of the hair-pin coils of each second segmented coil unit are the same as the pitches of the hair-pin coils of each first segmented coil unit.

12. The electric motor as claimed in claim 10 , wherein the pitches of the hair-pin coils of each second segmented coil unit are the same as the pitches of the hair-pin coils of each third segmented coil unit.

13. The electric motor as claimed in claim 10 , wherein each third segmented coil unit comprises a hair-pin coil with a diameter pitch.