CN116111753A - Driving motor stator oil cooling structure and oil cooling method thereof - Google Patents
Driving motor stator oil cooling structure and oil cooling method thereof Download PDFInfo
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- CN116111753A CN116111753A CN202310394801.XA CN202310394801A CN116111753A CN 116111753 A CN116111753 A CN 116111753A CN 202310394801 A CN202310394801 A CN 202310394801A CN 116111753 A CN116111753 A CN 116111753A
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- 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
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- 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
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- 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)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention relates to the technical field of cooling of driving motors, and provides a driving motor stator oil cooling structure and an oil cooling method thereof, wherein the structure comprises the following components: the stator comprises a shell, a stator core and a stator winding, wherein the stator core and the stator winding are respectively positioned in the shell; wherein, the stator winding is positioned at two sides of the stator core; the shell is provided with an oil inlet, an annular groove and an oil spraying hole, and the oil inlet, the annular groove and the oil spraying hole are sequentially communicated; the stator core comprises a first core punching sheet, a second core punching sheet and a third core punching sheet; the first iron core punching sheet is provided with a first axial through hole, the second iron core punching sheet is provided with a second axial through hole, and the first axial through hole, the second axial through hole and the annular groove are communicated in sequence. The invention can realize deep cooling of the stator core, synchronous cooling of the stator core and the stator winding, has high overall cooling efficiency and simple process, can greatly reduce the production and application cost, and can ensure that the cooling effect of the stator core and the stator winding is more uniform during cooling.
Description
Technical Field
The invention relates to the technical field of driving motor cooling, in particular to a driving motor stator oil cooling structure and an oil cooling method thereof.
Background
In the high-speed rotation working process of the driving motor, the heat source is mainly concentrated on the motor stator, the motor rotor winding and the iron core, and if the driving motor works in a high-temperature environment for a long time, the working efficiency of the driving motor is seriously affected and the service life of the driving motor is reduced. The limit of the working efficiency of the driving motor is generally limited by the thermal limit capability, and the power density and the torque density of the driving motor can be improved under the same size by a stronger heat dissipation technology, so that the working performance and the service life of the driving motor are improved. The existing driving motors, especially in new energy automobiles, often do not pay attention to cooling of the motor stator.
In the existing driving motor stator cooling mode, when the stator core is cooled, cooling liquid flows through channels arranged on the outer annular surface of the stator core to finish cooling the stator core, and the cooling part of the cooling liquid mainly acts on the outer annular surface of the stator core and cannot deeply cool the stator core; in addition, the axial channel is arranged on the outer ring surface of the stator core, so that the processing complexity of a single core punching sheet can be greatly increased, and when a plurality of core punching sheets are spliced to form a coherent long channel, higher requirements are also put on the assembly precision of the plurality of core punching sheets. The existing driving motor stator cooling scheme has low overall cooling efficiency and complex technological process.
In view of this, overcoming the defects in the prior art is a problem to be solved in the art.
Disclosure of Invention
The invention preferably provides a solution to the technical problems of low cooling efficiency and complex process in the existing driving motor stator cooling scheme.
In order to solve the technical problems, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a driving motor stator oil cooling structure, comprising:
the stator comprises a shell 1, a stator core 2 and a stator winding 3, wherein the stator core 2 and the stator winding 3 are respectively positioned inside the shell 1; wherein the stator windings 3 are positioned at two sides of the stator core 2;
the shell 1 is provided with an oil inlet 11, a first annular groove 12 and an oil spray hole 13, and the oil inlet 11, the first annular groove 12 and the oil spray hole 13 are communicated in sequence; the stator core 2 comprises a first core punching sheet 21, a second core punching sheet 22 and a third core punching sheet 23, wherein the first core punching sheet 21, the second core punching sheet 22 and the third core punching sheet 23 share a central axis, the third core punching sheet 23 is positioned between the first core punching sheet 21 and the second core punching sheet 22, and the radius is smaller than the radius of the first core punching sheet 21 and the second core punching sheet 22; the first core punching sheet 21 is provided with a first axial through hole 211, the second core punching sheet 22 is provided with a second axial through hole 221, and the first axial through hole 211, the second axial through hole 221 and the first annular groove 12 are communicated in sequence;
the cooling oil is divided into two paths after being injected from the oil inlet hole 11, one path flows along the circumferential direction of the first annular groove 12, and when flowing through the oil nozzle 13, the cooling oil radially cools the stator winding 3 at one side of the stator core 2 through the oil nozzle 13; the other path passes through the second axial through hole 221, flows through the outer annular surface of the second core punching sheet 22, merges into the first axial through hole 211, and after cooling of the stator core 2 is completed, the stator winding 3 on the other side of the stator core 2 is cooled radially through the first axial through hole 211.
Preferably, the oil jet 13, the first axial through hole 211, and the second axial through hole 221 are disposed in a circumferential array, respectively.
Preferably, the first axial through hole 211 is disposed at a staggered distance from the central axis.
Preferably, the distance between the second axial through hole 221 and the central axis is equal.
Preferably, the first axial through hole 211 and the second axial through hole 221 have rectangular, circular or fan-shaped cross sections.
Preferably, the method further comprises:
the sealing ring 4 is arranged in the second annular groove 14 of the shell 1; wherein the slot directions of the second annular grooves 14 are respectively toward the stator core 2.
Preferably, the housing 1 and the stator core 2 are interference fit.
In a second aspect, the present invention provides a method for cooling a stator of a drive motor, comprising:
s10, injecting cooling oil; injecting cooling oil into the stator of the driving motor through the oil inlet hole 11 of the shell 1;
s20, determining a flow path of cooling oil; the cooling oil injected from the oil inlet hole 11 of the shell 1 is divided into two paths, one path flows along the circumferential direction of the first annular groove 12 of the shell 1, and when the cooling oil flows through the oil nozzle 13 of the shell 1, the stator winding 3 at one side of the stator core 2 is radially cooled through the oil nozzle 13; the other path passes through the second axial through hole 221 arranged on the second core punching sheet 22 of the stator core 2, flows through the outer annular surface of the third core punching sheet 23 of the stator core 2, merges into the first axial through hole 211 arranged on the first core punching sheet 21 of the stator core 2, and after cooling of the stator core 2 is completed, the stator winding 3 on the other side of the stator core 2 is cooled radially through the first axial through hole 211.
Preferably, the oil jet 13, the first axial through hole 211, and the second axial through hole 221 are disposed in a circumferential array, respectively.
Preferably, in S20, the determining a flow path of the cooling oil further includes:
a sealing ring 4 is arranged; the sealing ring 4 is arranged in the second annular groove 14 of the housing 1, and the sealing ring 4 prevents the cooling oil from seeping out of the stator of the drive motor.
Aiming at the defects in the prior art, the invention has the following beneficial effects:
according to the invention, the stator core is provided with the axial through hole, and the axial through hole is used as a through hole of cooling oil, so that the deep cooling of the stator core can be realized; meanwhile, the cooling oil is divided into two paths, so that the stator core and the stator windings on two sides of the stator core can be synchronously cooled, the overall cooling efficiency is high, and the technological process is simple.
Furthermore, through ingenious shell structure design and by taking the oil spraying hole directly arranged on the shell and the axial through hole directly arranged on the stator core as the oil spraying hole, compared with the prior art that an oil spraying ring with the oil spraying hole is arranged on one side of the stator core, or the oil spraying rings with the oil spraying holes are respectively arranged on two sides of the stator core, the whole process of the invention does not need to use the oil spraying ring, and the production and application cost can be greatly reduced.
Furthermore, the oil spray holes and the axial through holes are respectively arranged along the circumferential array, so that the stator core and the stator windings on two sides of the stator core can be cooled more uniformly in the synchronous cooling process of the stator core and the stator windings on two sides of the stator core.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are required to be used in the embodiments of the present invention will be briefly described below. It is evident that the drawings described below are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a partial sectional view of a stator oil cooling structure of a driving motor provided in embodiment 1;
fig. 2 is an overall three-dimensional cross-sectional view of a driving motor stator oil cooling structure provided in embodiment 1;
fig. 3 is a sectional view of a casing of a stator oil cooling structure of a driving motor provided in embodiment 1;
fig. 4 is an exploded view of a stator core of a stator oil cooling structure of a driving motor provided in embodiment 1;
fig. 5 is an assembly view of a stator core of a stator oil cooling structure of a driving motor provided in embodiment 1;
fig. 6 is a front view of a first core segment of the stator core of fig. 4 and 5;
fig. 7 is a second core sheet elevation view of the stator core of fig. 4 and 5;
FIG. 8 is a front view of a third core segment of the stator core of FIGS. 4 and 5;
fig. 9 is a schematic diagram of an application process of a stator oil cooling structure of a driving motor according to embodiment 1.
In the drawings, like reference numerals are used to designate like parts or structures, wherein:
1-a shell, 11-an oil inlet hole, 12-a first annular groove, 13-an oil injection hole and 14-a second annular groove; 2-stator core, 21-first core punching sheet, 211-first axial through hole, 22-second core punching sheet, 221-second axial through hole, 23-third core punching sheet; 3-stator windings; 4-sealing rings.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, the terms "inner", "outer", "longitudinal", "transverse", "upper", "lower", "top", "bottom", etc. refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1:
in order to solve the technical problems of low cooling efficiency and complex process in the existing cooling scheme of the stator of the driving motor, embodiment 1 provides an oil cooling structure of the stator of the driving motor, as shown in fig. 1-2, which comprises: the stator comprises a shell 1, a stator core 2 and a stator winding 3, wherein the stator core 2 and the stator winding 3 are respectively positioned inside the shell 1; wherein the stator windings 3 are located on both sides of the stator core 2.
The shell 1 and the stator core 2 are in interference fit, and the interference fit mode has the characteristics of simple structure, good centering, easiness in implementation and the like, and other auxiliary fastening parts and materials are not needed in the assembly process.
The specific implementation is as follows: as shown in fig. 3, the casing 1 is provided with an oil inlet 11, a first annular groove 12 and an oil spray hole 13, and the oil inlet 11, the first annular groove 12 and the oil spray hole 13 are communicated in sequence; as shown in fig. 4 to 8, the stator core 2 includes a first core segment 21, a second core segment 22, and a third core segment 23, the first core segment 21, the second core segment 22, and the third core segment 23 share a central axis, and the third core segment 23 is located between the first core segment 21 and the second core segment 22, and has a radius smaller than the radii of the first core segment 21 and the second core segment 22; the first core plate 21 is provided with a first axial through hole 211, the second core plate 22 is provided with a second axial through hole 221, and the first axial through hole 211, the second axial through hole 221, and the first annular groove 12 are sequentially communicated.
After the above paths are connected, as shown in fig. 1, 5 and 9, the cooling method is as follows: the cooling oil is divided into two paths after being injected from the oil inlet hole 11, one path flows along the circumferential direction of the first annular groove 12, and when flowing through the oil nozzle 13, the cooling oil radially cools the stator winding 3 at one side of the stator core 2 through the oil nozzle 13; the other path passes through the second axial through hole 221, flows through the outer annular surface of the second core punching sheet 22, merges into the first axial through hole 211, and after cooling of the stator core 2 is completed, the stator winding 3 on the other side of the stator core 2 is cooled radially through the first axial through hole 211.
In the present embodiment, by providing the first axial through hole 211 and the second axial through hole 221 in the stator core, the first axial through hole 211 and the second axial through hole 221 are used as the through holes for cooling oil, and deep cooling of the stator core 2 can be achieved; meanwhile, by dividing the cooling oil into two paths, the stator core 2 and the stator windings 3 at two sides of the stator core 2 can be synchronously cooled, the overall cooling efficiency is high, and the process is simple; in addition, through ingenious shell structure design, the invention can effectively replace the prior art scheme that an oil injection ring with the oil injection hole is arranged on one side of the stator core or the oil injection rings with the oil injection holes are arranged on two sides of the stator core by taking the oil injection hole 13 which is directly arranged on the shell and the first axial through hole 211 which is directly arranged on the stator core as the oil injection hole, and the whole application process does not need to use the oil injection ring, so that the production and application cost can be greatly reduced.
In order to make the stator core and the stator windings on both sides of the stator core more uniform in cooling, the oil spray holes 13, the first axial through holes 211, and the second axial through holes 221 are arranged in circumferential arrays, respectively.
In the practical application process, the distances between the first axial through holes 211 and the central shaft are staggered, when the cooling oil passes through the first axial through holes 211 to radially cool the stator windings 3 on the other side of the stator core 2, S-shaped spray columns with different flow rates and periodically changed can be formed, the contact path between the cooling oil and the stator windings 3 in the spraying process can be effectively prolonged, the contact area between the cooling oil and the stator windings 3 is increased, the diffusion process of the cooling oil on the stator windings 3 is accelerated, and the cooling efficiency can be further improved; meanwhile, on the side of the stator core 2, in order to make the cooling oil uniformly enter the stator core 2, the distance between the second axial through hole 221 and the center axis is equal.
In order to allow the cooling oil to be sprayed onto the stator windings in a suitable position, as an adjustable implementation, the oil spray holes 13 are at a predetermined angle to the vertical axial plane of the housing 1, as shown in fig. 3.
In the practical application process, the cross sections of the first axial through hole 211 and the second axial through hole 221 are rectangular, circular or fan-shaped, as shown in fig. 6-7, the cross sections of the first axial through hole 211 and the second axial through hole 221 are shown in a rectangular manner, in order to increase the contact area between the cooling oil and the stator core 2, and further improve the cooling capacity of the stator core 2, under the condition that the rigidity of the first axial through hole 211 and the second axial through hole 221 is not affected, the cross sections of the first axial through hole 211 and the second axial through hole 221 can also be circular or fan-shaped, wherein the fan-shaped is better, and the center of the fan-shaped is located on the central axis of the stator core 2.
Considering that there may be a small gap between the parts of the driving motor, the cooling oil may ooze out from the stator of the driving motor, which may adversely affect the cooling effect of the stator of the driving motor, and may pollute other parts of the driving motor, in order to prevent the cooling oil from oozing out from the stator of the driving motor, as one implementation manner, embodiment 1 provides an oil cooling structure of the stator of the driving motor, as shown in fig. 1-2, further including: the sealing ring 4 is arranged in the second annular groove 14 of the shell 1; wherein the slot directions of the second annular grooves 14 are respectively toward the stator core 2.
Example 2:
based on the same general technical concept as embodiment 1, embodiment 2 provides a driving motor stator oil cooling method, using the driving motor stator oil cooling structure described in embodiment 1, including:
s10, injecting cooling oil; cooling oil is injected into the stator of the driving motor through the oil inlet hole 11 of the shell 1.
Wherein, casing 1 is equipped with inlet port 11, first ring channel 12 and nozzle opening 13, and inlet port 11, first ring channel 12 and nozzle opening 13 communicate in proper order, in the direction towards stator core 2, casing 1 still is equipped with second ring channel 14.
S20, determining a flow path of cooling oil; the cooling oil injected from the oil inlet hole 11 of the shell 1 is divided into two paths, one path flows along the circumferential direction of the first annular groove 12 of the shell 1, and when the cooling oil flows through the oil nozzle 13 of the shell 1, the stator winding 3 at one side of the stator core 2 is radially cooled through the oil nozzle 13; the other path passes through the second axial through hole 221 arranged on the second core punching sheet 22 of the stator core 2, flows through the outer annular surface of the third core punching sheet 23 of the stator core 2, merges into the first axial through hole 211 arranged on the first core punching sheet 21 of the stator core 2, and after cooling of the stator core 2 is completed, the stator winding 3 on the other side of the stator core 2 is cooled radially through the first axial through hole 211.
In order to make the stator core and the stator windings on both sides of the stator core more uniform in cooling, the oil spray holes 13, the first axial through holes 211, and the second axial through holes 221 are arranged in circumferential arrays, respectively.
In order to prevent the cooling oil from oozing out of the driving motor stator, in S20, the determining a flow path of the cooling oil further includes: a sealing ring 4 is arranged; the sealing ring 4 is arranged in the second annular groove 14 of the housing 1, and the sealing ring 4 prevents the cooling oil from seeping out of the stator of the drive motor.
In summary, the invention provides the driving motor stator oil cooling structure and the driving motor stator oil cooling method, which can realize deep cooling of the stator core, synchronous cooling of the stator core and the stator winding, and has the advantages of high overall cooling efficiency, simple process, greatly reduced production and application costs, and more uniform cooling effect of the stator core and the stator winding during cooling.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. A drive motor stator oil cooling structure, comprising:
the stator comprises a shell (1), a stator core (2) and a stator winding (3), wherein the stator core (2) and the stator winding (3) are respectively positioned in the shell (1); wherein, the stator winding (3) is positioned at two sides of the stator core (2);
the shell (1) is provided with an oil inlet (11), a first annular groove (12) and an oil spraying hole (13), and the oil inlet (11), the first annular groove (12) and the oil spraying hole (13) are communicated in sequence; the stator core (2) comprises a first core punching sheet (21), a second core punching sheet (22) and a third core punching sheet (23), wherein the first core punching sheet (21), the second core punching sheet (22) and the third core punching sheet (23) share a central axis, the third core punching sheet (23) is positioned between the first core punching sheet (21) and the second core punching sheet (22), and the radius is smaller than the radius of the first core punching sheet (21) and the second core punching sheet (22); the first iron core punching sheet (21) is provided with a first axial through hole (211), the second iron core punching sheet (22) is provided with a second axial through hole (221), and the first axial through hole (211), the second axial through hole (221) and the first annular groove (12) are communicated in sequence;
the cooling oil is divided into two paths after being injected from the oil inlet hole (11), one path flows along the circumferential direction of the first annular groove (12), and when flowing through the oil nozzle (13), the stator winding (3) at one side of the stator core (2) is radially cooled through the oil nozzle (13); the other path passes through the second axial through hole (221), flows through the outer annular surface of the second iron core punching sheet (22), merges into the first axial through hole (211), and after cooling of the stator iron core (2) is completed, the stator winding (3) at the other side of the stator iron core (2) is cooled radially through the first axial through hole (211).
2. The drive motor stator oil cooling structure according to claim 1, wherein the oil spray holes (13), the first axial through holes (211) and the second axial through holes (221) are respectively arranged in a circumferential array.
3. The drive motor stator oil cooling structure according to claim 2, characterized in that the distance between the first axial through hole (211) and the central shaft is staggered.
4. The drive motor stator oil cooling structure according to claim 2, characterized in that the distance between the second axial through hole (221) and the central shaft is equal.
5. The drive motor stator oil cooling structure according to claim 2, characterized in that the first axial through hole (211) and the second axial through hole (221) are rectangular, circular or fan-shaped in cross section.
6. The drive motor stator oil cooling structure of claim 1, further comprising:
the sealing ring (4), the second annular groove (14) of the body (1) of the sealing ring (4); wherein the notch direction of the second annular groove (14) faces the stator core (2) respectively.
7. The drive motor stator oil cooling structure according to claim 1, characterized in that the housing (1) and the stator core (2) are interference fit.
8. A method of oil cooling a stator of a drive motor, comprising:
s10, injecting cooling oil; injecting cooling oil into a stator of the driving motor through an oil inlet hole (11) of the shell (1);
s20, determining a flow path of cooling oil; the method comprises the steps that cooling oil injected from an oil inlet hole (11) of a shell (1) is divided into two paths, one path flows along the circumferential direction of a first annular groove (12) of the shell (1), and when flowing through an oil injection hole (13) of the shell (1), a stator winding (3) on one side of a stator core (2) is cooled radially through the oil injection hole (13); the other path passes through a second axial through hole (221) arranged on a second iron core punching sheet (22) of the stator iron core (2), flows through the outer annular surface of a third iron core punching sheet (23) of the stator iron core (2), and merges into a first axial through hole (211) arranged on a first iron core punching sheet (21) of the stator iron core (2), and after cooling of the stator iron core (2) is completed, the stator winding (3) on the other side of the stator iron core (2) is cooled radially through the first axial through hole (211).
9. The method of oil cooling of a drive motor stator according to claim 8, characterized in that the oil spray holes (13), the first axial through holes (211) and the second axial through holes (221) are arranged in a circumferential array, respectively.
10. The driving motor stator oil cooling method according to claim 8, wherein in S20, the determining a flow path of cooling oil further includes:
a sealing ring (4) is arranged; the sealing ring (4) is arranged in a second annular groove (14) of the shell (1), and cooling oil is prevented from seeping out of the stator of the driving motor through the sealing ring (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202310394801.XA CN116111753A (en) | 2023-04-13 | 2023-04-13 | Driving motor stator oil cooling structure and oil cooling method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310394801.XA CN116111753A (en) | 2023-04-13 | 2023-04-13 | Driving motor stator oil cooling structure and oil cooling method thereof |
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| CN202310394801.XA Pending CN116111753A (en) | 2023-04-13 | 2023-04-13 | Driving motor stator oil cooling structure and oil cooling method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118971424A (en) * | 2024-10-14 | 2024-11-15 | 小米汽车科技有限公司 | Stator core, motor and vehicle |
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| CN218514184U (en) * | 2022-08-10 | 2023-02-21 | 阿尔特汽车技术股份有限公司 | Structure for cooling stator core and stator winding of driving motor |
| CN218416113U (en) * | 2022-10-27 | 2023-01-31 | 苏州汇川联合动力系统有限公司 | Oil-cooled motor |
| CN115580071A (en) * | 2022-10-31 | 2023-01-06 | 安徽江淮汽车集团股份有限公司 | Cooling structure and cooling method for oil-cooled motor stator and winding |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118971424A (en) * | 2024-10-14 | 2024-11-15 | 小米汽车科技有限公司 | Stator core, motor and vehicle |
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