Stator assembly and hairpin winding motor including the same

1. A stator assembly comprising:

a stator core including teeth, which are formed along an inner circumferential surface of the stator core, extend from one surface of the stator core to an opposite surface of the stator core, and have through holes formed through one surfaces of the teeth, respectively;

a plurality of hairpins, each hairpin coupled to and connected with a slot formed between the teeth and configured to form a coil winding; and

a heat radiating device including a first heat radiating member provided at one side of the one surface of the stator core and configured to discharge heat of the hairpin to an outside, such that the hairpin is cooled,

wherein the first heat radiating member includes:

a first heat pipe configured to discharge the heat of the hairpin, which is provided in the stator core, to the outside such that the hairpin is cooled, and provided at the one side of the one surface of the stator core; and

a first fixing member configured to fix the first heat pipe to the stator core,

wherein the first heat pipe includes:

a plurality of first heat parts inserted into the through holes of the teeth, which are formed at the one side of the one surface of the stator core, respectively, and configured to absorb the heat of the hairpins coupled to the slots through the teeth;

a first connection part provided at the one side of the one surface of the stator core and configured to connect the plurality of first heat parts, which are inserted into the through holes, with each other and to absorb heat of the first heat parts; and

a first discharge part provided at the first connection part and configured to discharge heat of the first connection part to the outside.

2. The stator assembly of claim 1 , wherein the first heat part is inserted into the through hole while extending from one surface of the through hole to an opposite surface of the through hole and configured to simultaneously absorb the heat of the hairpin coupled to the slot from one side of the hairpin to an opposite side of the hairpin.

3. The stator assembly of claim 1 , wherein the first heat part has an area smaller than an area of the through hole to form an oil inflow space which is formed between the first heat part and an inner wall surface of the through hole.

4. The stator assembly of claim 1 , wherein the first fixing member includes:

a first outer fixing part configured to fix the first connection part of the first heat pipe; and

a first inner fixing part configured to fix the first heat part of the first heat pipe, and

wherein the first inner fixing part is formed to correspond to the tooth formed in the stator core.

5. The stator assembly of claim 4 , wherein the first outer fixing part includes:

a first one-side fitting groove formed in one side of an opposite surface of the first outer fixing part such that the first connection part and the first heat part, which are positioned at the one side of the one surface of the stator core, are fixedly inserted into the first one-side fitting groove; and

a first through hole formed in one side of one surface of the first outer fixing part such that the first discharge part passes through the first through hole.

6. The stator assembly of claim 5 , wherein the first fixing member has a face-to-face close contact with the one surface of the stator core, when the first connection part and the first heat part, which are positioned at the one side of the one surface of the stator core, are fitted into the first one-side fitting groove.

7. The stator assembly of claim 6 , wherein the heat radiating device further includes:

a second heat radiating member provided at an opposite side of an opposite surface of the stator core and configured to discharge the heat of the hairpin to the outside, such that the hairpin is cooled, and

wherein the second heat radiating member includes:

a second heat pipe configured to discharge the heat of the hairpin, which is provided in the stator core, to the outside such that the hairpin is cooled, and provided at the opposite side of the opposite surface of the stator core; and

a second fixing member configured to fix the second heat pipe to the stator core.

8. The stator assembly of claim 7 , wherein the second heat pipe includes:

a plurality of second heat parts inserted into through holes of teeth formed in the opposite side of the opposite surface of the stator core, respectively, and configured to absorb the heat of the hairpins coupled to the slots through the teeth;

a second connection part provided at the opposite side of the opposite surface of the stator core and configured to connect the plurality of second heat parts, which are inserted into the through holes, with each other and to absorb heat of the second heat parts; and

a second discharge part provided at the second connection part and configured to discharge heat of the second connection part to the outside.

9. The stator assembly of claim 8 , wherein the second heat part is inserted into the through hole while extending from the opposite surface of the through hole to the one surface of the through hole and configured to simultaneously absorb the heat of the hairpin coupled to the slot from opposite surface of the hairpin to one surface of the hairpin.

10. The stator assembly of claim 9 , wherein the second heat part has an area smaller than an area of the through hole to form an oil inflow space between the second heat part and an inner wall surface of the through hole.

11. The stator assembly of claim 8 , wherein the second fixing member includes:

a second outer fixing part configured to fix the second connection part of the second heat pipe; and

a second inner fixing part configured to fix the second heat part of the second heat pipe, and

wherein the second inner fixing part is formed to correspond to the tooth formed in the stator core.

12. The stator assembly of claim 11 , wherein the second outer fixing part of the second fixing member includes:

a second opposite-side fitting groove formed in an opposite side of one surface of the second outer fixing part, such that the second connection part and the second heat part, which are positioned at the opposite side of the opposite surface of the stator core, are fixedly inserted into the second opposite-side fitting groove; and

a second through hole formed in an opposite surface of the second outer fixing part, such that the second discharge part passes through the second through hole.

13. The stator assembly of claim 12 , wherein a first opposite-side fitting groove is formed in an opposite side of the opposite surface of the first outer fixing part of the first fixing member, such that an end portion of the second heat part passing through the through hole is fitted into and coupled to the first opposite-side fitting groove, and

wherein a second one-side fitting groove is formed in one side of the one surface of the second outer fixing part of the second fixing member, such that an end portion of the first heat part passing through the through hole is fitted into and coupled to the second one-side fitting groove.

14. A hairpin winding motor comprising:

a stator assembly according of claim 1 ;

a rotor inserted into the stator assembly;

a housing configured to receive the stator assembly into which the rotor is inserted; and

a spraying device including:

a spraying part to cool the stator assembly by spraying oil toward the first heat radiating member included in the heat radiating device of the stator assembly; and

a supply part to recover oil deposited on a bottom surface of the housing and to supply the oil to the spraying part,

wherein the spraying device cools the stator assembly while simultaneously cooling the hairpin, which is coupled to the slot, from one side of the hairpin to an opposite side of the hairpin, as the oil flows from one surface of the through hole to an opposite surface of the through hole along the first heat part or the second heat part.