CN110808645A

CN110808645A - Cooling structure applied to oil-cooled flat wire motor stator

Info

Publication number: CN110808645A
Application number: CN201911063665.6A
Authority: CN
Inventors: 刘蕾; 江超; 朱标龙; 彭旸
Original assignee: Hefei JEE Power System Co Ltd
Current assignee: Hefei JEE Power System Co Ltd
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-02-18
Anticipated expiration: 2039-11-04
Also published as: CN110808645B

Abstract

The invention discloses a cooling structure applied to an oil-cooled flat wire motor stator, wherein an oil through hole is formed between the outer diameter ends of two adjacent winding notches on a stator core. Two oil guiding structures are further fixed on the end face of the stator core, wherein the first oil guiding structure is an annular structure coincident with the end face of the stator core, and oil guiding holes corresponding to the oil through holes are formed in the first oil guiding structure. The second oil guide structure is attached to the first oil guide structure, a boss and an oil duct inlet are arranged on the outer diameter side of the second oil guide structure, and a plurality of oil injection holes are formed in one side, close to the winding, of the boss. Two oil guide structure binding faces are provided with grooves, and an oil duct is formed after binding. The first oil guide structure and the second oil guide structure have the main functions of enabling oil to effectively flow through the oil through holes and the oil spray holes, and increasing cooling efficiency and cooling uniformity. The invention can effectively improve the cooling effect of the flat wire motor stator and is suitable for the hairpin and I-pin winding stators.

Description

Cooling structure applied to oil-cooled flat wire motor stator

Technical Field

The invention relates to the field of motor cooling, in particular to a cooling structure applied to an oil-cooled flat wire motor stator.

Background

The flat wire motor stator winding is formed by inserting a forming hairpin coil or a single-side coil into a stator iron core slot, compared with the traditional round wire motor, the scheme does not need to embed wires by slotting a stator tooth part, and can form an oil path without slotting and guide oil to the oil path in an integral plastic package mode, so that efficient cooling is realized.

The prior art has the main defects that as no oil way or other structures are designed, only a small amount of oil contacted with the surface can play a cooling role, and the cooling efficiency is low and uneven.

Disclosure of Invention

The invention aims to: the cooling structure is applied to the stator of the oil-cooled flat wire motor, a groove is formed in a stator punching sheet, an oil through hole is formed in the stator, and then cooling oil is guided to the oil through hole in an injection molding or plastic package mode. Has higher requirements on the precision of injection molding parts or the whole plastic package process.

The technical scheme of the invention is as follows:

the utility model provides a be applied to cooling structure of oil-cooled flat wire motor stator, motor stator includes stator core, be provided with the oil through hole between the external diameter end of two adjacent winding notches on the stator core.

Preferably, a first oil guiding structure is further fixed on the end face of the stator core, the first oil guiding structure is an annular structure coinciding with the end face of the stator core, and the first oil guiding structure is provided with an oil guiding hole corresponding to the oil through hole; the end face of the first oil guide structure is also fixedly provided with a second oil guide structure, the second oil guide structure is an annular structure which is superposed with the end face of the first oil guide structure, the outer side surface of the second oil guide structure is provided with an oil duct inlet, the outer diameter part of the second oil guide structure is provided with a boss, and the boss is provided with a plurality of oil injection holes; the first oil guide structure and the second oil guide structure are respectively provided with a first groove and a second groove at the joint, and the first groove and the second groove are combined to form an oil duct.

Preferably, the first oil guide structure is obtained by manufacturing an injection molding piece or integral plastic package, and the second oil guide structure is obtained by manufacturing an injection molding piece.

Preferably, the first oil guide structure and the second oil guide structure collect oil into an oil passage formed by combining the first groove and the second groove through an oil passage inlet.

Preferably, the oil guide hole of the first oil guide structure flows the oil collected in the oil passage to the oil through hole; the oil spray hole of the second oil guide structure sprays the oil collected in the oil duct to the flat wire winding in the winding notch.

Preferably, the oil hole collects irregular oil originally, and the oil enters the stator core to cool the inside of the stator core and the outer diameter side of the flat wire winding.

Preferably, the oil jet holes collect the original irregular oil and cool the inner side of the flat wire winding.

The invention has the advantages that:

the cooling structure applied to the stator winding of the oil-cooled flat wire motor is provided with the oil through hole, the oil injection hole, the first oil guide structure and the second oil guide structure which are used for forming the oil way, can effectively improve the cooling effect of the stator of the flat wire motor, and is suitable for the winding stators of the Hair-pin and I-pin.

Drawings

The invention is further described with reference to the following figures and examples:

FIG. 1 is a sectional view of a stator of an 8-pole 48-slot motor in the embodiment;

FIG. 2 is an enlarged partial cross-sectional view of the stator of the motor of FIG. 1;

FIG. 3 is a schematic view of a first oil guiding structure in the embodiment;

FIG. 4 is a schematic view of a second oil guide structure in the embodiment;

FIG. 5 is a schematic cross-sectional view of the first oil guiding structure after the two are assembled together;

FIG. 6 is a schematic diagram of a path of oil in the stator and oil guiding structure;

FIG. 7 is an assembled schematic view of a flat wire motor stator;

FIG. 8 is a schematic view of a flat wire motor stator assembly.

Detailed Description

The embodiment of the invention discloses a cooling structure applied to a stator winding of an oil-cooled flat wire motor, wherein the motor stator comprises a stator core 1, a flat wire winding 2, a first oil guide structure 4 and a second oil guide structure 7, as shown in fig. 7 and 8.

As shown in fig. 1 and 2, the present invention will be described by taking an 8-pole 48-slot flat-wire motor stator as an example. And an oil through hole 3 is formed between the outer diameter ends of two adjacent winding notches on the stator core 1. Oil hole 3 will gather the fluid of irregularity originally, let fluid get into stator core 1 inside to stator core 1 inside and the external diameter side of flat wire winding 2 cool off.

The end face of the stator core 1 is further fixed with a first oil guiding structure 4, as shown in fig. 3. The first oil guide structure 4 is an annular structure superposed with the end face of the stator core 1, and the first oil guide structure 4 is provided with oil guide 6 corresponding to the oil through hole. The end face, which is not in contact with the stator core 1, of the first oil guide structure 4 is provided with a first groove 5. the first oil guide structure 4 is obtained by manufacturing an injection molding piece or an integral plastic package.

And a second oil guide structure 7 is fixed on the end surface of the first oil guide structure 4, as shown in fig. 4. The second oil guide structure 7 is an annular structure with the end faces of the first oil guide structures 4 coinciding, a boss protruding out of the plane is arranged at the outer diameter of the second oil guide structure 7, a plurality of oil injection holes 10 are formed in the boss, an oil duct inlet 9 is formed in the outer side of the second oil guide structure 7, and a second groove 8 is formed in the end face, contacting with the first oil guide structure 4, of the second oil guide structure 7. The second oil guide structure 7 is obtained by manufacturing an injection molding piece.

The first groove 5 of the first oil guiding structure 4 and the second groove 8 of the second oil guiding structure 7 form an oil passage 11 in combination, as shown in fig. 5.

The main effect of first oil guide structure 4 and second oil guide structure 7 is to assemble the irregular fluid that exists originally, makes partly fluid more effective flow through from oil through hole 3, and the effectual inflow of another part fluid increases refrigerated efficiency and refrigerated homogeneity in 2 tip of winding simultaneously. The first oil guide structure 4 and the second oil guide structure 7 collect irregularly-existing oil in an oil duct 11 through an oil duct inlet 9, and simultaneously introduce one part of oil into the oil through hole 3 through the oil guide hole 6, and the other part of oil flows to the end part of the winding 2 through the oil injection hole 10. The flow path of the oil is shown in fig. 6.

The assembly process of the stator assembly is shown in fig. 7 and 8, and the first oil guide structure 4 and the second oil guide structure 7 are installed or plastically packaged before the wire insertion, so that the efficiency of the wire insertion is not affected, and the process difficulty of assembly is not increased.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All modifications made according to the spirit of the main technical scheme of the invention are covered in the protection scope of the invention.

Claims

1. The utility model provides a be applied to cooling structure of oil-cooled flat wire motor stator, motor stator includes stator core (1), its characterized in that, be provided with oil through hole (3) between the external diameter end of two adjacent winding notches on stator core (1).

2. The cooling structure according to claim 1, wherein a first oil guiding structure (4) is further fixed on the end surface of the stator core (1), the first oil guiding structure (4) is an annular structure coinciding with the end surface of the stator core (1), and the first oil guiding structure (4) is provided with oil guiding holes (6) corresponding to the oil through holes (3); a second oil guide structure (7) is further fixed on the end face of the first oil guide structure (4), the second oil guide structure (7) is an annular structure which is overlapped with the end face of the first oil guide structure (4), an oil duct inlet (9) is formed in the outer side surface of the second oil guide structure (7), a boss is arranged at the outer diameter position, and a plurality of oil injection holes (10) are formed in the boss; the first oil guide structure (4) and the second oil guide structure (7) are respectively provided with a first groove (5) and a second groove (8) at the joint, and the first groove (5) and the second groove (8) are combined to form an oil channel (11).

3. The cooling structure according to claim 2, characterized in that the first oil guiding structure (4) is obtained by means of injection molding or integral plastic molding, and the second oil guiding structure (7) is obtained by means of injection molding.

4. The cooling structure according to claim 2, characterized in that the first oil guiding structure (4) and the second oil guiding structure (7) collect oil via an oil passage inlet (9) into an oil passage (11) formed by the combination of the first groove (5) and the second groove (8).

5. The cooling structure according to claim 4, wherein the oil guide hole (6) of the first oil guide structure (4) flows the oil collected in the oil passage (11) toward the oil through hole (3); the oil spray hole (10) of the second oil guide structure (7) sprays the oil collected in the oil duct (11) to the flat wire winding (2) in the winding notch.

6. The cooling structure according to claim 5, wherein the oil hole (3) collects oil that is irregular originally, and allows the oil to enter the inside of the stator core (1) to cool the inside of the stator core (1) and the outer diameter side of the flat wire winding (2).

7. The cooling structure according to claim 5, characterized in that the oil jet holes (10) collect otherwise irregular oil and cool the inside of the flat wire winding (2).