Motor stator cooling structure

Abstract

To provide a cooling structure for a motor stator. [Solution] The motor includes a stator core and two oil spray rings attached to both ends of the stator core, the stator core having a yoke and a plurality of core teeth extending inward from the yoke. A coolant flow passage extending along the axial direction of the stator core is formed inside each of the core teeth, and each of the oil spray rings is provided with an intersecting oil outlet hole and a guide groove. The two oil spray rings are installed intersecting each other, so that the oil outlet holes located at both ends of the stator core intersect with each other. In this way, the coolant flows into the stator core from both ends of the stator core simultaneously in an intersecting manner along the axial direction, achieving the effect of uniformly lowering the temperature and improving the situation where a part of the motor stator becomes hot.

Description

[Technical field]

[0001] The present invention relates to a motor stator cooling structure, and more particularly to a cooling structure that sufficiently cools a motor stator during operation. [Background technology]

[0002] Because the thermal energy released during the motor's operation causes the motor to heat up, it was necessary to install a cooling structure to lower the motor's temperature and prevent the motor's temperature from becoming too high and damaging the structure. Summary of the Invention [Problem to be solved by the invention]

[0003] However, most of the conventional motor heat dissipation methods achieve the cooling effect by installing a coolant flow path and spraying the coolant onto the motor coil. Since most of the coolant flow paths are unidirectional, the temperature at both ends and the middle part of the motor cannot be uniformly lowered, resulting in a situation where the temperature at the middle part is high or one side is high.

[0004] Therefore, the present inventors believed that the above-mentioned drawbacks could be improved, and as a result of extensive research, they came to propose the present invention, which effectively improves the above-mentioned problems through rational design.

[0005] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a cooling structure for a motor stator, and in particular to provide a cooling structure that sufficiently cools the motor stator during operation. [Means for solving the problem]

[0006] In order to solve the above problems, a cooling structure for a motor stator according to one embodiment of the present invention comprises a stator core having a yoke portion and a plurality of core teeth extending inward from the yoke portion, each of the core teeth having a plurality of coolant flow paths extending along the axial direction of the stator core, and two oil spray rings attached to both ends of the stator core. Each of the oil spray rings has a plurality of teeth corresponding to the core teeth, each of the oil spray rings has a plurality of oil outlet holes spaced apart from each other on the plurality of teeth, and each of the oil spray rings has a plurality of convex portions spaced apart on its outer circumferential surface, with a guide groove formed between two adjacent convex portions. The two oil spray rings are installed in an intersecting manner, and are located at both ends of the stator core. One of the oil spray rings Oil outlet hole and the oil outlet hole of the other oil spray ring; intersect with each other.

[0007] Preferably, the oil outlet holes and the guide grooves of each of the oil spray rings are intertwined.

[0008] Preferably, the stator core further includes a coil disposed around the core teeth of the stator core.

[0009] Preferably, the oil supply device further includes two end caps respectively installed on the outsides of the two oil spray rings, and an oil supply portion and an oil discharge portion are provided on the outer circumferential surfaces of the two end caps.

[0010] Preferably, the two oil spray rings are injection molded from a polymeric insulating material including polycarbonate (PC), polyphenylene sulfide (PPS), polyetheretherketone (PEEK), polyamide 66 (PA66), polyester (PBT), polyethersulfone (PES), polysulfone (PSU), polypropylene (PP), polyethylene (PE), polyacetal (POM), polyvinyl chloride (PVC), or polymer blends of these materials.

[0011] Preferably, the two end caps are injection molded from a polymeric insulating material including polycarbonate (PC), polyphenylene sulfide (PPS), polyetheretherketone (PEEK), polyamide 6-6 (PA66), polyester (PBT), polyethersulfone (PES), polysulfone (PSU), polypropylene (PP), polyethylene (PE), polyacetal (POM), polyvinyl chloride (PVC), or polymer blends of these materials. [Brief description of the drawings]

[0012] [Figure 1] 1 is a schematic diagram showing a cooling structure of a motor stator according to an embodiment of the present invention; [Diagram 2] 1 is a schematic exploded view showing a cooling structure for a motor stator according to an embodiment of the present invention; [Diagram 3] 1 is a side view showing a cooling structure for a motor stator according to an embodiment of the present invention; [Figure 4] FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. [Diagram 5] FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, the embodiments of the present invention will be described in detail. However, the present invention is not limited to these, and various modifications are possible within the scope of the description. The technical scope of the present invention also includes embodiments obtained by appropriately combining the technical means disclosed in the different embodiments.

[0014] For ease of understanding, in the present invention, the axial direction of the stator core 10 is referred to as the leftward or rightward direction, and the radial direction is referred to as the upward or downward direction.

[0015] The cooling structure of the motor stator will be described in detail with reference to FIGS.

[0016] A cooling structure for a motor stator according to an embodiment of the present invention includes a stator core 10 and two oil spray rings 21, 22 attached to both ends of the stator core 10, the stator core 10 being formed by combining a plurality of silicon steel plates. The stator core 10 has a yoke portion 13 and a plurality of core teeth 12 extending inward from the yoke portion 13, a coolant flow path 11 extending along the axial direction of the stator core 10 is formed inside each of the core teeth 12, and a coil 15 is provided around the core teeth 12 of the stator core 10.

[0017] In this embodiment, the two oil spray rings 21 and 22 are injection molded from polymer insulating materials including polycarbonate (PC), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polyamide 6-6 (PA66), polyester (PBT), polyether sulfone (PES), polysulfone (PSU), polypropylene (PP), polyethylene (PE), polyacetal (POM), polyvinyl chloride (PVC), or polymer blends of these materials. The material of the two oil spray rings 21 and 22 is different from the material of the stator core 10, thereby improving the insulating ability of the motor stator.

[0018] 3 to 5, each of the oil spray rings 21, 22 has a plurality of teeth 211, 221 corresponding to the core tooth portion 12, each of the oil spray rings 21, 22 has a plurality of oil outlet holes 21b, 22b spaced apart from the plurality of teeth 211, 221 along the circumferential direction of the oil spray rings 21, 22, and has a plurality of convex portions 21c, 22c spaced apart from each other on the outer circumferential surface of each of the oil spray rings 21, 22. Guide grooves 21a, 22a are formed between two adjacent convex portions 21c, 22c, and the two oil spray rings 21, 22 located at both ends of the stator core 10 are installed in an intersecting manner, so that the oil outlet holes 21b, 22b intersect with each other. That is, the guide grooves 21a, 22a of the oil spray rings 21, 22 located at both ends of the stator core 10 are arranged to cross each other, and the state shown in Figures 4 and 5 is formed. The guide grooves 21a, 22a are used to introduce the coolant into the coolant flow passage 11, and the spaced apart protrusions 21c, 22c are used to block the inlets of the coolant flow passages 11 that are not connected to the guide grooves 21a, 22a. When the oil spray rings 21, 22 cross each other, there is only one guide groove 21a, 22a in the same axial direction, and the stator core 10 is formed in a state in which the coolant is introduced from both ends in a crossing manner.

[0019] Specifically, the two end caps 31, 32 are installed on the outside of the oil spray rings 21, 22, respectively, and the outer circumferential surfaces of the two end caps 31, 32 are provided with oil supply portions 31a, 32a and oil discharge portions 31b, 32b, and the oil supply portions 31a, 32a and the oil discharge portions 31b, 32b are located on the same diameter. More specifically, the coolant is introduced from the oil supply portion 31a of the left end cap 31 and flows toward the guide groove 21a of the oil spray ring 21, and then the coolant enters the coolant flow path 11 of the stator core 10, flows out from the oil outlet hole 22b of the right end oil spray ring 22, and is discharged from the oil discharge portion 32b of the right end cap 32. That is, the guide groove 21a and the oil outlet hole 22b located on the same axial direction are mutually connected to the coolant flow path 11 of the stator core 10. In the adjacent coolant flow passage 11, coolant flows from the oil supply portion 32a of the right end cap 32 toward the guide groove 22a of the oil spray ring 22, flows out from the oil outlet hole 21b of the left end oil spray ring 21, and is discharged from the oil discharge portion 31b of the left end cap 31. The two end caps 31, 32 are injection molded from a polymer insulating material including polycarbonate (PC), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polyamide 6-6 (PA66), polyester (PBT), polyethersulfone (PES), polysulfone (PSU), polypropylene (PP), polyethylene (PE), polyacetal (POM), polyvinyl chloride (PVC), or a polymer blend of these materials.

[0020] As shown in Fig. 4, when the two oil spray rings 21, 22 are installed in an intersecting manner, the right end of the stator core 10 becomes the guide groove 22a, and the left end becomes the oil outlet hole 21b. The adjacent coolant flow passage 11 communicates with the left end guide groove 21a (shown in Fig. 5) and the right end oil outlet hole 22b, so that the coolant flows into the coolant flow passage 11 from both ends of the stator core 10 and intersects at the same time, and is sprayed uniformly onto the coil 15, forming a cooling circuit with completely opposite flow directions, whereby the temperature on both sides of the motor stator is exchanged with each other, improving the temperature distribution of the motor stator and achieving the effect of uniformly lowering the temperature, thereby improving the situation where one part of the motor stator becomes hot.

[0021] The present invention improves the insulating ability of the motor stator by using oil spray rings 21, 22 made of a material different from that of the stator core 10. The oil spray rings 21, 22 are installed in an intersecting manner, so that the coolant flows from both ends of the stator core 10 in the axial direction and into the inside of the stator core 10, and also flows out in the radial direction from the oil discharge parts 31b, 32b of the end caps 31, 32, thereby achieving the effect of uniform temperature reduction and improving the situation in which some parts of the motor stator become hot.

[0022] Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is clear to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the description of the claims that such modifications and improvements can also be included in the technical scope of the present invention. [Explanation of symbols]

[0023] 10 Stator core 11 Coolant flow path 12 Core teeth 13 York 15 Coil 21 Oil spray ring 21a Guide groove 21b Oil outlet hole 21c Convex 211 Teeth 22 Oil spray ring 22a Guide groove 22b Oil outlet hole 22c Convex 221 Teeth 31 End Cap 31a Refueling Section 31b Oil discharge section 32 End cap 32a Refueling Section 32b Oil discharge section

Claims

1. a stator core having a yoke portion and a plurality of core teeth extending inward from the yoke portion, each of the core teeth having a coolant flow passage extending along an axial direction of the stator core; a cooling structure for a motor stator, comprising: two oil spray rings attached to both ends of the stator core, each of the oil spray rings having a plurality of teeth corresponding to the core tooth portions, each of the oil spray rings having a plurality of oil outlet holes spaced apart from each other on the plurality of teeth, each of the oil spray rings having a plurality of protrusions spaced apart from each other on its outer circumferential surface, a guide groove being formed between two adjacent protrusions, and the two oil spray rings being intersected and installed such that the oil outlet hole of one of the oil spray rings located at both ends of the stator core and the oil outlet hole of the other oil spray ring intersect with each other.

2. 2. The cooling structure of a motor stator according to claim 1, wherein the oil outlet holes and the guide grooves of each of the oil spray rings are arranged in an intersecting manner.

3. 2. The cooling structure of a motor stator according to claim 1, further comprising a coil disposed around the core teeth of the stator core.

4. 2. The cooling structure of the motor stator according to claim 1, further comprising two end caps respectively installed on the outside of the two oil spray rings, and an oil supply portion and an oil discharge portion are provided on the outer peripheral surfaces of the two end caps.

5. The motor stator cooling structure according to any one of claims 1 to 4, characterized in that the two oil spray rings are injection molded from a polymer insulating material including polycarbonate (PC), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polyamide 66 (PA66), polyester (PBT), polyethersulfone (PES), polysulfone (PSU), polypropylene (PP), polyethylene (PE), polyacetal (POM), polyvinyl chloride (PVC), or a polymer blend of these materials.

6. The cooling structure of the motor stator according to claim 4, wherein the two end caps are injection molded from polymer insulating materials including polycarbonate (PC), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polyamide 6-6 (PA66), polyester (PBT), polyethersulfone (PES), polysulfone (PSU), polypropylene (PP), polyethylene (PE), polyacetal (POM), polyvinyl chloride (PVC), or polymer blends of these materials.

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