Cooling structure of motor stator

Abstract

To provide cooling structure of a motor stator.SOLUTION: Cooling structure comprises: a stator core; and two oil spray rings stuck on respective both ends of the stator core. The stator core has a yoke part and a plurality of core tooth parts extending inward from the yoke part. A cooling liquid passage extending in an axial direction of the stator core is formed inside each of the core tooth parts, and an oil outlet hole and a guide groove crossing each other are provided in each of the oil spray rings. The oil outlet holes located on both ends of the stator core cross each other by installing the two oil spray rings crossing each other. Thus, cooling liquid simultaneously crosses each other from both ends of the stator core to flow into the stator core in the axial direction, to achieve an effect of uniform cooling, and to improve a situation that temperature of a part of a motor stator becomes high.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] In the operation process of the motor, the heat energy dissipated raises the temperature of the motor. Therefore, it is necessary to install a cooling structure to lower the temperature of the motor and prevent the situation where the temperature of the motor becomes too high and the structure is damaged.

Summary of the Invention

Problems to be Solved by the Invention

[0003] However, most of the conventional heat dissipation methods of motors achieve the cooling effect by installing a coolant flow path and spraying the coolant onto the motor coil. Since many coolant flow paths are one-way flow paths, it is impossible to uniformly cool the temperatures at both ends and the middle part of the motor, resulting in a situation where the temperature of the middle part becomes high or the temperature of one side becomes high.

[0004] Therefore, the inventor considered that the above-mentioned drawbacks could be improved, and as a result of intensive studies, the present invention was proposed to effectively improve the above-mentioned problems through reasonable design.

[0005] The present invention has been made in view of such circumstances, and its object is to provide a cooling structure for a motor stator, and in particular, a cooling structure that sufficiently cools the motor stator during operation.

Means for Solving the Problems

[0006] To solve the above problems, the cooling structure of the motor stator according to an aspect of the present invention includes a stator core having a yoke portion and a plurality of core teeth portions extending inward from the yoke portion, each of the core teeth portions having a plurality of coolant flow paths extending along the axial direction of the stator core, a stator core, and two oil spray rings respectively attached to both ends of the stator core. Each of the oil spray rings has a plurality of tooth portions corresponding to the core teeth portions, each of the oil spray rings has a plurality of oil outlet holes provided at intervals in the plurality of tooth portions, and each outer peripheral surface of the oil spray rings has a plurality of convex portions provided at intervals, and a guide groove is formed between two adjacent convex portions. By installing the two oil spray rings in a staggered manner, the oil outlet holes located at both ends of the stator core intersect with each other.

[0007] Preferably, the oil outlet holes and the guide grooves of each of the oil spray rings are provided in a staggered manner.

[0008] Preferably, the stator core further has coils provided around the core teeth portions of the stator core.

[0009] Preferably, the motor stator cooling structure further includes two end caps respectively installed outside 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.

[0010] Preferably, 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), polyether sulfone (PES), polysulfone (PSU), polypropylene (PP), polyethylene (PE), polyacetal (POM), polyvinyl chloride (PVC), or a polymer blend of these materials.

[0011] Preferably, the two end caps are injection-molded from a polymer insulating material 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 a polymer blend of these materials.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

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

[0014] For ease of understanding, in the present invention, the axial direction of the stator core 10 is referred to as the left direction or the right direction, and the radial direction is referred to as the upper direction or the lower direction.

[0015] With reference to FIGS. 1 to 5, details of the cooling structure of the motor stator will be described.

[0016] The cooling structure of a motor stator according to an embodiment of the present invention includes a stator core 10 and two oil spray rings 21 and 22 respectively attached to both ends of the stator core 10. The stator core 10 is formed by combining a plurality of silicon steel sheets. The stator core 10 has a yoke portion 13 and a plurality of core tooth portions 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 tooth portions 12, and a coil 15 is provided around these core tooth portions 12 of the stator core 10.

[0017] In this embodiment, the two oil spray rings 21 and 22 are injection-molded from a polymer insulating material 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 a polymer blend of these materials. The different materials of the two oil spray rings 21 and 22 from that of the stator core 10 enhance the insulation ability of the motor stator.

[0018] As shown in FIGS. 3 to 5, each of the oil spray rings 21 and 22 has a plurality of tooth portions 211 and 221 corresponding to the core tooth portions 12, and each of the oil spray rings 21 and 22 has a plurality of oil outlet holes 21b and 22b provided at intervals along the circumferential direction of the oil spray rings 21 and 22 among the plurality of tooth portions 211 and 221. Each outer peripheral surface of the oil spray rings 21 and 22 has a plurality of convex portions 21c and 22c provided at intervals. Guide grooves 21a and 22a are formed between two adjacent convex portions 21c and 22c, and the two oil spray rings 21 and 22 located at both ends of the stator core 10 are installed in a staggered manner, so that the oil outlet holes 21b and 22b intersect with each other. That is, the guide grooves 21a and 22a of the oil spray rings 21 and 22 located at both ends of the stator core 10 are provided in a staggered manner, and the state shown in FIGS. 4 and 5 is formed. The guide grooves 21a and 22a are used to introduce the coolant into the coolant flow path 11, and the spaced convex portions 21c and 22c are used to block the inlets of the coolant flow paths 11 that do not communicate with the guide grooves 21a and 22a. When the oil spray rings 21 and 22 intersect, only one of the guide grooves 21a and 22a is present in the same axial direction, and a state is formed in which the coolant is introduced into the stator core 10 in a staggered manner from both ends.

[0019] Specifically, the two end caps 31 and 32 are respectively installed outside each of the oil spray rings 21 and 22. On the outer peripheral surfaces of the two end caps 31 and 32, an oil supply portion 31a, 32a and an oil discharge portion 31b, 32b are provided, and the oil supply portion 31a, 32a and the oil discharge portion 31b, 32b are located on the same diameter. More specifically, the coolant is introduced from the oil supply portion 31a of the end cap 31 at the left end and is flowed toward the guide groove 21a of the oil spray ring 21. After that, the coolant enters the coolant flow path 11 of the stator core 10, flows out from the oil outlet hole 22b of the oil spray ring 22 at the right end, and is led out from the oil discharge portion 32b of the end cap 32 at the right end. That is, the guide groove 21a and the oil outlet hole 22b located in the same axial direction communicate with each other in the coolant flow path 11 of the stator core 10. Also, in the adjacent coolant flow path 11, the coolant flows from the oil supply portion 32a of the end cap 32 at the right end toward the guide groove 22a of the oil spray ring 22, enters, flows out from the oil outlet hole 21b of the oil spray ring 21 at the left end, and is led out from the oil discharge portion 31b of the end cap 31 at the left end. The two end caps 31 and 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), polyether sulfone (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 and 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 paths 11 communicate with the guide groove 21a (shown in Fig. 5) at the left end and the oil outlet hole 22b at the right end. When the coolant flows into the coolant flow paths 11 simultaneously from both ends of the stator core 10 in an intersecting manner and is uniformly sprayed onto the coil 15, a cooling circuit with completely opposite flow directions is formed. The temperatures on both sides of the motor stator are exchanged with each other, the temperature distribution of the motor stator is improved, the effect of uniformly reducing the temperature is achieved, and the situation where a part of the motor stator becomes high temperature is improved.

[0021] The present invention improves the insulation ability of the motor stator by using oil spray rings 21 and 22 made of materials different from that of the stator core 10. Due to the intersecting installation of the oil spray rings 21 and 22, the coolant flows into the interior of the stator core 10 along the axial direction simultaneously from both ends of the stator core 10 in an intersecting manner and flows out radially from the oil discharge parts 31b and 32b of the end caps 31 and 32, achieving the effect of uniformly reducing the temperature and improving the situation where a part of the motor stator becomes high temperature.

[0022] As described above, the present invention has been described using embodiments. However, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is obvious to those skilled in the art that various changes or improvements can be made to the above embodiments. It is clear from the description of the claims that such modified or improved forms can also be included in the technical scope of the present invention.

Explanation of Reference Numerals

[0023] 10 Stator core 11 Coolant flow path 12 Core tooth part 13 Yoke part 15 Coil 21 Oil spray ring 21a Guide groove 21b Oil outlet hole 21c Protrusion 211 Tooth part 22 Oil spray ring 22a Guide groove 22b Oil outlet hole 22c Protrusion 221 Tooth part 31 End cap 31a Oil supply part 31b Oil discharge part 32 End cap 32a Oil supply part 32b Oil discharge part

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 path extending along the axial direction of the stator core, and a stator core; Two oil spray rings respectively attached to both ends of the stator core, each of the oil spray rings having a plurality of teeth corresponding to the core teeth, each of the oil spray rings having a plurality of oil outlet holes provided at intervals in the plurality of teeth, and each of the outer peripheral surfaces of the oil spray rings having a plurality of convex portions provided at intervals, a guide groove being formed between two adjacent convex portions, and the two oil spray rings being installed in a staggered manner so that the oil outlet holes located at both ends of the stator core intersect each other. A cooling structure for a motor stator, characterized by comprising two oil spray rings.

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

3. The cooling structure of the motor stator according to claim 1, further comprising coils provided around the core teeth of the stator core.

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

5. 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), polyether sulfone (PES), polysulfone (PSU), polypropylene (PP), polyethylene (PE), polyacetal (POM), polyvinyl chloride (PVC), or a polymer blend of these materials. The cooling structure of the motor stator according to any one of claims 1 to 4, characterized in that.

6. 5. The cooling structure of a motor stator according to claim 4, wherein the two end caps 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.

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