CN115580071A - Cooling structure and cooling method for oil-cooled motor stator and winding - Google Patents
Cooling structure and cooling method for oil-cooled motor stator and winding Download PDFInfo
- Publication number
- CN115580071A CN115580071A CN202211351185.1A CN202211351185A CN115580071A CN 115580071 A CN115580071 A CN 115580071A CN 202211351185 A CN202211351185 A CN 202211351185A CN 115580071 A CN115580071 A CN 115580071A
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- Prior art keywords
- oil
- winding
- stator core
- shell
- stator
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- 238000004804 winding Methods 0.000 title claims abstract description 63
- 238000001816 cooling Methods 0.000 title claims abstract description 56
- 238000007789 sealing Methods 0.000 claims description 26
- 238000005507 spraying Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims 1
- 239000003921 oil Substances 0.000 abstract description 133
- 229910000976 Electrical steel Inorganic materials 0.000 abstract description 7
- 238000002360 preparation method Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention relates to a cooling structure and a cooling method for a stator and a winding of an oil-cooled motor, wherein the cooling structure comprises a shell, a stator core and a winding; the inner surface of the shell is provided with an annular oil groove and an axial oil groove communicated with the annular oil groove, a first oil duct is arranged in the shell, and a second oil duct communicated with the first oil duct and the annular oil groove is arranged on the shell; the outer surface of the stator core and the annular oil groove form a third oil channel, the outer surface of the stator core and the annular oil groove form a fourth oil channel, and the winding is wound on the stator core; two ends of the stator core are respectively provided with an oil drenching ring, the shell, the stator core and the oil drenching rings form a fifth oil duct, and the oil drenching rings are provided with oil holes communicated with the fifth oil duct. This technical scheme can carry out effectual cooling to the stator core and the winding of motor to do not fluting on stator core's surface, promoted the output performance and the NVH performance of motor, and the specification of silicon steel sheet is unified and the structure is simple relatively, has reduced the preparation cost of silicon steel sheet.
Description
Technical Field
The invention belongs to the technical field of motor cooling, and particularly relates to a cooling structure and a cooling mode for a stator and a winding of an oil-cooled motor.
Background
The motor is the core drive unit of new energy automobile, and because the existence of various losses can produce the heat in its work, consequently need cool off it, guarantees that it can normally work. The most important parts of the motor which generate heat are the stator and the winding of the motor. At present, three cooling media of the motor comprise wind, water and oil, wherein the oil cooling can be directly cooled, so that the cooling effect is the best, and the trend of the industry at present is.
As shown in fig. 1 and 2, in a motor oil cooling structure in the prior art, cooling oil enters from a shell oil inlet 01, flows into an annular groove in the middle of a stator core 05 along an oil passage, diffuses and flows to two sides along an axial oil passage on the surface of the stator core, and simultaneously takes away heat generated by the stator core and windings in the stator core. And after the oil channel comes out of the axial oil channel of the stator core, the oil enters the oil drenching ring 03 at the end part, and the winding 04 at the end part is drenched and cooled through a small hole on the oil drenching ring.
The cooling effect of the motor oil in the prior art is good, but the following defects still exist:
1) The annular oil groove is formed in the middle of the stator core, so that the specifications of silicon steel sheets in the middle of the stator core are different from those of two sides of the stator core, and extra cost needs to be added for forming the silicon steel sheets by the two specifications of the silicon steel sheets.
2) The stator core is provided with the slots, and the magnetic resistance at the slot positions of the core can be increased, so that the output performance of the motor is influenced.
3) The stator core is provided with a slot, which is unfavorable for the NVH performance of the motor.
4) Both sides of the oil drenching ring are end face seals, so that on one hand, the axial compression ratio is not easy to control, and the final sealing effect is influenced; on the other hand, the radial positioning is inaccurate due to the radial clearance.
Disclosure of Invention
The present invention is directed to a cooling structure and a cooling method for a stator and a winding of an oil-cooled electric machine, which solve at least one of the problems of the related art.
In order to achieve the purpose, the application is realized through the following technical scheme:
a cooling structure of an oil-cooled motor stator and a winding comprises a shell, a stator iron core and a winding;
the inner surface of the shell is provided with two circles of protruding parts at intervals along the circumferential direction, an annular oil groove is formed between the two circles of protruding parts at intervals, an axial oil groove is formed between every two adjacent circles of protruding parts, a first oil duct is arranged in the shell, an oil inlet is formed in the shell and communicated with the first oil duct, and a second oil duct communicated with the first oil duct and the annular oil groove is formed in the shell;
the stator core is arranged in the shell, a third oil duct is formed by the outer surface of the stator core and the annular oil groove, a fourth oil duct is formed by the outer surface of the stator core and the axial oil groove, a winding groove is formed in the inner surface of the stator core, and a winding is wound on the stator core through the winding groove; two ends of the stator core in the shell are respectively provided with an oil drenching ring, the shell, the stator core and the oil drenching rings form a fifth oil duct, and the oil drenching rings are provided with oil holes communicated with the fifth oil duct.
Further, the outer surface of the stator core is in a smooth round tube shape.
Furthermore, more than two oil holes are arranged along the circumferential direction of the oil drenching ring.
Furthermore, a first sealing ring is arranged between the oil drenching ring and the shell, and a second sealing ring is arranged between the oil drenching ring and the stator.
Furthermore, the first sealing ring and the second sealing ring play a role in sealing the fifth oil duct, so that set oil pressure is established in the fifth oil duct.
Furthermore, the first sealing ring is arranged on the oil spraying ring and matched with the inner wall of the shell to form radial sealing, and meanwhile, the oil spraying ring is radially positioned.
Furthermore, the second sealing ring is installed on the oil drenching ring and matched with the end face of the stator core to form end face sealing.
A cooling method for a stator and a winding of an oil-cooled motor utilizes any one of the cooling structures, and comprises the following steps:
cooling oil enters the first oil duct in the shell through the oil inlet and then enters the third oil duct through the second oil duct, and flows into the fourth flow passages on two sides from the third oil duct to take away heat generated by the stator core and the winding in the winding slot;
and cooling oil flows out of the fourth flow channel, enters the fifth oil channel, and is sprayed to the end part of the winding through the oil hole in the oil spraying ring.
The invention has the beneficial effects that:
1. this technical scheme can carry out effectual cooling to the stator core and the winding of motor to do not fluting on stator core's surface, promoted the output performance and the NVH performance of motor, and the specification of silicon steel sheet is unified and the structure is simple relatively, has reduced the preparation cost of silicon steel sheet.
2. The radial seal mode that this technical scheme's drenches oil ring adopted, except can satisfying sealed effect, can also carry out radial positioning to drenching the oil ring, make the final mounted position of drenching the oil ring more accurate, the cooling effect is better to drenching the oil ring and only adopting a terminal surface seal, the compression ratio of drenching oil ring terminal surface seal department is controlled more easily, and sealed effect is better.
Drawings
Fig. 1 is a schematic view of a cooling structure of a prior art motor.
Fig. 2 is a schematic view of a prior art stator core structure.
Fig. 3 is a schematic view of the cooling structure of the stator and the winding of the oil-cooled motor of the present invention.
Fig. 4 is a partially enlarged schematic view of fig. 3.
Fig. 5 is a schematic view of the housing structure of the present invention.
Fig. 6 is a schematic view of the stator core structure of the present invention.
Description of reference numerals:
01-a housing oil inlet; 02-a housing; 03-oil drenching ring; 04-winding; 05-a stator core; 06-rotor iron core; 07-a rotor shaft; 1-an oil inlet; 2-a first oil gallery; 3-a second oil passage; 4-a stator core; 5-oil drenching ring; 6-winding; 7-a housing; 8-a third oil passage; 9-a fourth oil passage; 10-a fifth oil gallery; 11-oil hole; 12-a first sealing ring; 13-a second sealing ring; 14-an annular oil groove; 15-a projection; 16-axial oil groove.
Detailed Description
The technical solutions of the present invention are described in detail below with reference to the accompanying drawings, and the following examples are only exemplary, and are only used to explain and illustrate the technical solutions of the present invention, and should not be interpreted as limiting the technical solutions of the present invention.
In the technical solution of the present application, there is no improvement to the basic structure of the electric machine, and each electric machine still includes its basic components, such as the housing, the stator core, the windings, and the rotor, and the applicant does not describe here in detail.
On the other hand, the technical scheme of this application only improves through the partial structure to the motor to realize effects such as the cooling effect of this application.
As shown in fig. 3 to 6, the present application provides a cooling structure for a stator and a winding of an oil-cooled motor, which includes a housing 7, a stator core 4 and a winding 6, and the cooling structure is related to these three components, but is not described to include only these components.
The improvement of the present application is that the inner surface of the housing is provided with two circles of spaced protrusions 15 along the axial direction, as shown in fig. 5 in particular, the housing of the present application is symmetrical with a cross section passing through the midpoint of the axial centerline and perpendicular to the axial centerline, and for this reason, in the technical solution of the present application, it is actually described for one side of the housing, and the structure of the other side is completely the same.
Form annular oil groove 14 between two rings of spaced protrusions, form axial oil groove 16 between every two adjacent protrusions of circle, be provided with the second oil duct 3 of intercommunication first oil duct 2 on the casing, the second oil duct is open in annular oil groove 14.
As shown in fig. 6, the stator core 4 of the present application is disposed in the housing 7, the outer surface of the stator core is in a smooth circular tube shape, that is, the surface is smooth, the stator core 4 is one of the heat generating components of the motor, and is a cooled component in the present technical solution, the outer surface of the stator core of the present application forms a third oil passage 8 with the annular oil groove, and forms a fourth oil passage 9 with the axial oil groove, a winding slot is disposed on the inner surface of the stator core, and the winding 6 is wound on the stator core through the winding slot. The winding is also one of the heat generating components of the electrical machine, and includes portions disposed in the winding slots and end portions, depending on the position of the winding, as the cooled component.
Two oil drenching rings 5 are respectively arranged at two ends of the stator core in the shell and are used for cooling the end part of the winding, the shell, the stator core and the oil drenching rings form a fifth oil channel 10, a circle of more than two oil holes 11 communicated with the fifth oil channel are arranged on the oil drenching rings, the fifth oil channel is communicated with a fourth oil channel, and cooling oil is used for spraying and cooling the end part of the winding through the oil holes.
In the technical scheme of this application, the axial cross-section of oilhole is the toper platform shape, and two adjacent oilholes are the reverse shape setting, one of them oilhole big end in bottom surface communicates with the fifth oil duct, the little end in bottom surface is relative with winding end portion, adjacent oilhole then the little end in bottom surface communicates with the fifth oil duct, the big end in bottom surface is relative with winding end portion, such oilhole structure uses the cooling oil speed that sprays to winding end portion to be different, wherein the pressure of the little one end in bottom surface and the relative oilhole spun of winding end portion pressure is big, can go deep into winding end portion's inside, carry out the degree of depth cooling to it, the pressure of another part oilhole is little and form partial turbulent flow, increase the contact time with winding end portion, make the heat that the winding produced can be taken more out, improve the cooling effect.
A first sealing ring 12 is arranged between the oil drenching ring and the shell, the first sealing ring is arranged on the oil drenching ring and matched with the inner wall of the shell to form radial sealing, and meanwhile, the oil drenching ring is radially positioned.
And a second sealing ring 13 is arranged between the oil drenching ring and the stator, and the second sealing ring is arranged on the oil drenching ring and is matched with the end surface of the stator core to form end surface sealing.
The application also provides a cooling method for the stator and the winding of the oil-cooled motor, which utilizes the cooling structure of any one of the above items and comprises the following steps:
the cooling oil enters the first oil duct in the shell through the oil inlet and then enters the third oil duct through the second oil duct, and flows into the fourth flow passages on two sides from the third oil duct to take away heat generated by the stator core and the winding in the winding slot, so that the purpose of cooling the stator core and the sub-winding in the winding slot is achieved.
And the cooling oil continuously flows, flows out of the fourth flow channel, enters the fifth oil channel, and is sprayed to the end part of the winding through the oil hole in the oil spraying ring. The first sealing ring and the second sealing ring play a role in sealing the fifth oil duct, so that set oil pressure is established in the fifth oil duct, and better spraying and cooling effects are achieved when cooling oil is sprayed out through the oil holes.
Although embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A cooling structure of an oil-cooled motor stator and a winding is characterized by comprising a shell, a stator core and a winding;
the inner surface of the shell is provided with two circles of protruding parts at intervals along the circumferential direction, an annular oil groove is formed between the two circles of protruding parts at intervals, an axial oil groove is formed between every two adjacent circles of protruding parts, a first oil duct is arranged in the shell, an oil inlet is formed in the shell and communicated with the first oil duct, and a second oil duct communicated with the first oil duct and the annular oil groove is formed in the shell;
the stator core is arranged in the shell, a third oil duct is formed by the outer surface of the stator core and the annular oil groove, a fourth oil duct is formed by the outer surface of the stator core and the axial oil groove, a winding slot is formed in the inner surface of the stator core, and a winding is wound on the stator core through the winding slot; two ends of the stator core in the shell are respectively provided with an oil drenching ring, the shell, the stator core and the oil drenching rings form a fifth oil duct, and the oil drenching rings are provided with oil holes communicated with the fifth oil duct.
2. The oil-cooled motor stator and winding cooling structure as claimed in claim 1, wherein the outer surface of the stator core is a smooth circular tube.
3. The cooling structure for the stator and the winding of the oil-cooled motor according to claim 1, wherein two or more oil holes are formed along the circumferential direction of the oil dripping ring.
4. The cooling structure for the oil-cooled motor stator and the winding as claimed in claim 1, wherein a first sealing ring is disposed between the oil drip ring and the housing, and a second sealing ring is disposed between the oil drip ring and the stator.
5. The oil-cooled motor stator and winding cooling structure as claimed in claim 4, wherein the first and second sealing rings seal the fifth oil passage, thereby establishing a predetermined oil pressure in the fifth oil passage.
6. The oil-cooled motor stator and winding cooling structure as claimed in claim 5, wherein the first sealing ring is mounted on the oil-spraying ring and cooperates with the inner wall of the housing to form a radial seal and to radially position the oil-spraying ring.
7. The cooling structure for the stator and the winding of the oil-cooled motor as claimed in claim 5, wherein the second sealing ring is mounted on the oil-spraying ring and is matched with the end face of the stator core to form an end face seal.
8. A method of cooling a stator and a winding of an oil-cooled motor using the cooling structure of any one of claims 1 to 7, characterized by comprising the steps of:
cooling oil enters the first oil duct in the shell through the oil inlet and then enters the third oil duct through the second oil duct, and flows into the fourth flow passages on two sides from the third oil duct to take away heat generated by the stator core and the winding in the winding slot;
and after flowing out of the fourth flow channel, the cooling oil enters the fifth oil channel and is sprayed to the end part of the winding through the oil hole on the oil spraying ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211351185.1A CN115580071A (en) | 2022-10-31 | 2022-10-31 | Cooling structure and cooling method for oil-cooled motor stator and winding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211351185.1A CN115580071A (en) | 2022-10-31 | 2022-10-31 | Cooling structure and cooling method for oil-cooled motor stator and winding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115580071A true CN115580071A (en) | 2023-01-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211351185.1A Pending CN115580071A (en) | 2022-10-31 | 2022-10-31 | Cooling structure and cooling method for oil-cooled motor stator and winding |
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| Country | Link |
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| CN (1) | CN115580071A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116054441A (en) * | 2023-04-01 | 2023-05-02 | 博格华纳汽车零部件（武汉）有限公司 | Driving motor stator oil cooling structure and oil cooling method thereof |
| CN116111753A (en) * | 2023-04-13 | 2023-05-12 | 博格华纳汽车零部件（武汉）有限公司 | Driving motor stator oil cooling structure and oil cooling method thereof |
| WO2024178877A1 (en) * | 2023-02-27 | 2024-09-06 | 丽水方德智驱应用技术研究院有限公司 | High-efficiency oil-cooled motor |
| WO2024179166A1 (en) * | 2023-02-27 | 2024-09-06 | 联合汽车电子有限公司 | Cooling motor |
| WO2025030829A1 (en) * | 2023-08-10 | 2025-02-13 | 精进电动科技股份有限公司 | Electric-motor stator cooling device and electric motor |
| WO2025036117A1 (en) * | 2023-08-11 | 2025-02-20 | 联合汽车电子有限公司 | Motor |
-
2022
- 2022-10-31 CN CN202211351185.1A patent/CN115580071A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024178877A1 (en) * | 2023-02-27 | 2024-09-06 | 丽水方德智驱应用技术研究院有限公司 | High-efficiency oil-cooled motor |
| WO2024179166A1 (en) * | 2023-02-27 | 2024-09-06 | 联合汽车电子有限公司 | Cooling motor |
| CN116054441A (en) * | 2023-04-01 | 2023-05-02 | 博格华纳汽车零部件（武汉）有限公司 | Driving motor stator oil cooling structure and oil cooling method thereof |
| CN116111753A (en) * | 2023-04-13 | 2023-05-12 | 博格华纳汽车零部件（武汉）有限公司 | Driving motor stator oil cooling structure and oil cooling method thereof |
| WO2025030829A1 (en) * | 2023-08-10 | 2025-02-13 | 精进电动科技股份有限公司 | Electric-motor stator cooling device and electric motor |
| WO2025036117A1 (en) * | 2023-08-11 | 2025-02-20 | 联合汽车电子有限公司 | Motor |
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