CN114157081A - Oil-cooled motor stator assembly - Google Patents
Oil-cooled motor stator assembly Download PDFInfo
- Publication number
- CN114157081A CN114157081A CN202111543271.8A CN202111543271A CN114157081A CN 114157081 A CN114157081 A CN 114157081A CN 202111543271 A CN202111543271 A CN 202111543271A CN 114157081 A CN114157081 A CN 114157081A
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- China
- Prior art keywords
- oil
- stator
- end cover
- iron core
- guide ring
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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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- 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
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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)
Abstract
The invention discloses an oil-cooled motor stator assembly which comprises a front end cover, a machine shell, a stator winding iron core and a rear end cover, wherein the stator winding iron core is arranged in a shell cavity formed by the front end cover, the machine shell and the rear end cover, the oil guide ring is arranged in the shell cavity, the stator winding iron core comprises a stator iron core and a lead arranged on the inner edge of the iron core, a group of open slots are formed in the outer edge of the stator iron core, one end of the oil guide ring is connected with one end face of the stator iron core in an attaching mode, the other end of the oil guide ring is connected with the inner wall of the rear end cover in an attaching mode, an oil inlet is formed in the machine shell, and a group of oil ring oil injection holes are formed in the oil guide ring. The inner side of the front end cover is provided with a spigot wall, the inner end of the spigot wall is provided with a front end cover sealing lip which is connected with the other end face of the stator core in a sealing mode in an attaching mode, and the spigot wall is provided with a group of end cover oil spray holes. Sufficient cooling, simple and convenient manufacture and relatively low cost.
Description
Technical Field
The invention relates to the technical field of motors, in particular to an oil-cooled motor stator assembly.
Background
The driving motor is a core component of an electric vehicle, the system performance and the use reliability of the driving motor are concerned, currently, under the background of the development of high power of the electric vehicle, the heat management performance of the motor becomes an important content of the development of the motor, and a high-power motor with high energy saving, high efficiency and excellent thermal performance becomes a favored object in the electric vehicle industry.
At present, most of driving motors used by electric automobiles adopt a water cooling scheme, the power of the motors is generally low, the volume of the motors is large due to the water cooling structure, the volume of the motors can be further increased by developing a high-power motor and continuously adopting the water cooling scheme, and the space requirement of the whole automobile cannot be met; due to the market demand on a high-power motor and the limitation of the installation space of the whole vehicle, the motor with high power and small volume is required to meet the demand, the oil-cooled motor can well adapt to the demand, cooling oil can be in full contact with a motor heat source to carry out heat exchange, the temperature of the motor is further reduced to enlarge the output power of the motor, and meanwhile, a complex water-cooling structure is removed to further reduce the volume of the motor; however, the existing oil-cooled motor stator assembly is complex in structure, has certain difficulty in structural processing and is relatively high in cost; and the cooling oil cavity is unreasonable in arrangement and insufficient in cooling.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an oil-cooled motor stator assembly to achieve the purposes of sufficient cooling, simple and convenient manufacture and relatively low cost.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the oil-cooled motor stator assembly comprises a front end cover, a machine shell, a stator winding iron core and a rear end cover, wherein the stator winding iron core is arranged in a shell cavity formed by the front end cover, the machine shell and the rear end cover, the oil guide ring is arranged in the shell cavity, the stator winding iron core comprises the stator iron core and a wire arranged on the inner edge of the iron core, a set of open slots are formed in the outer edge of the stator iron core, one end of the oil guide ring is attached to one end face of the stator iron core, the other end of the oil guide ring is attached to the inner wall of the rear end cover, an oil inlet is formed in the machine shell, and a set of oil ring oil injection holes are formed in the oil guide ring.
Further:
the inner side of the front end cover is provided with a spigot wall, the inner end of the spigot wall is provided with a front end cover sealing lip which is connected with the other end face of the stator core in a sealing mode in an attaching mode, and the spigot wall is provided with a group of end cover oil spray holes.
And the stator core and the oil guide ring are matched and locked and fixed on the shell through the same bolt.
The open slot includes circular arc hole and notch, is formed with the arc surface that is used for laminating the location with the casing inner wall between two adjacent notches.
And the group of oil ring oil spray holes and the group of end cover oil spray holes respectively comprise two rows of oil holes with staggered positions.
And sealing lips are arranged on two sides of the oil guide ring, two sides of the oil guide ring are matched with the end face of the stator core and the inner wall of the rear end cover to form a wire outlet end oil storage cavity, and the wire outlet end oil storage cavity is communicated with an oil ring oil injection hole of the oil guide ring and faces a wire of a wire outlet end.
And a non-leading-out end oil storage cavity is formed between the spigot wall of the front end cover and the shell and between the spigot wall of the front end cover and the stator core, and is communicated with an end cover oil injection hole of the front end cover and faces a non-leading-out end lead.
The outlet end oil storage cavity is directly communicated with the oil inlet.
Be equipped with the arch in stator core's the outer fringe, be equipped with the bolt hole along stator core axial in the arch, be equipped with along the location iron core axial by protruding position on the stator core and go heavy hole, be linked together through stator core's open slot and heavy hole that goes between leading-out terminal oil storage chamber and the non-leading-out terminal oil storage chamber.
Compared with the prior art, the invention has the following advantages:
1. the stator core and the stator lead are directly immersed in oil and are forcibly sprayed with oil for cooling, so that cooling is sufficient, and the heat dissipation effect of the motor stator and the reliability of motor heat management are improved;
2. the stator assembly oil duct is designed on the stator core, and the stator core oil duct is formed by direct punch, so that the design and machining process of the shell oil duct is avoided, the design and manufacturing difficulty of an oil cooling structure is effectively reduced, the manufacturing is simple and convenient, and the cost is low;
3. the spigot wall design of the front end cover effectively simplifies the assembly structure of the stator assembly, reduces the number of parts of the stator assembly and saves the cost;
4. stator core adopts the structural design of taking open slot and arc surface S, realizes stator core 'S location and heat dissipation demand in step, and the design of notch t makes partial cooling oil direct and casing contact heat dissipation, and the design of arc hole R has further enlarged stator core and cooling oil' S heat exchange area in the open slot, has improved the cooling effect.
Drawings
The contents of the description and the references in the drawings are briefly described as follows:
FIG. 1 is a schematic view of a stator assembly according to the present invention.
Fig. 2 is a schematic diagram of a stator winding core structure according to the present invention.
Fig. 3 is a schematic view of the end face structure of the stator core of the present invention.
Fig. 4 is a schematic diagram of the structure of the stator core open slot of the present invention.
Fig. 5 is a schematic structural view of the front end cap of the present invention.
Fig. 6 is a schematic view of an oil guide ring structure according to the first embodiment of the present invention.
Fig. 7 is a schematic view of an oil guide ring structure according to the present invention.
Fig. 8 is a schematic view of the location of the reservoir chamber of the present invention.
FIG. 9 is a block diagram of an oil circuit model according to the present invention.
In the figure:
the structure comprises a front end cover 1, an end cover oil injection hole 1-1, a front end cover sealing lip 1-2, a stop wall 1-3, a non-outgoing line end oil storage cavity 1-4, a machine shell 2, an oil inlet 2-1, a stator winding iron core 3, a non-outgoing line end lead 3-1, a stator iron core 3-2, a counterweight removing hole 3-2-1, an open slot 3-2-2, an R arc hole, a t-shaped slot opening, an S arc surface, a bolt hole 3-2-3, an outgoing line end lead 3-3, an oil guide ring 4, an oil ring oil injection hole 4-1, a bolt hole 4-2, a sealing lip I4-4 through hole 4-4, a sealing lip II 4-6, an outgoing line end oil storage cavity 5, a rear end cover and a screw rod 6.
Detailed Description
The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.
As shown in fig. 1 to 9, the oil-cooled motor stator assembly of the open type stamped steel comprises a front end cover 1, a casing 2, a stator winding iron core 3, a rear end cover 5 and an oil guide ring 4; the stator winding iron core and the oil guide ring are arranged in a shell cavity formed by the front end cover, the machine shell and the rear end cover.
The stator winding iron core comprises a stator iron core 3-2 and a lead arranged on the inner edge of the iron core, a group of open slots 3-2-2 are arranged on the outer edge of the stator iron core, one end of an oil guide ring is connected with one end face of the stator iron core in a fitting manner, the other end of the oil guide ring is connected with the inner wall of the rear end cover in a fitting manner, an oil inlet 2-1 is arranged on the machine shell, and a group of oil ring oil injection holes 4-1 are arranged on the oil guide ring 4; the inner side of the front end cover is provided with a spigot wall, the inner end of the spigot wall 1-3 is provided with a front end cover sealing lip which is jointed, sealed and connected with the other end face of the stator core, and the spigot wall 1-3 is provided with a group of end cover oil spray holes 1-1.
The stator core and the oil guide ring are matched and locked and fixed on the shell through the same bolt 6; the outer edge of the stator core is provided with a bulge, a bolt hole 3-2-3 is arranged in the bulge along the axial direction of the stator core, and a weight removing hole 3-2-1 is arranged on the stator core close to the bulge along the axial direction of the positioning core.
The open slot comprises an arc hole R and notches, and an arc surface for being attached and positioned with the inner wall of the shell is formed between every two adjacent notches; stator core adopts the structural design of taking open slot and arc surface S, realizes stator core 'S location and heat dissipation demand in step, and the design of notch t makes partial cooling oil direct and casing contact heat dissipation, and the design of arc hole R has further enlarged stator core and cooling oil' S heat exchange area in the open slot.
Two sides of the oil guide ring 4 are respectively provided with a sealing lip I4-3 positioned on one side and a sealing lip II 4-5 positioned on the other side; and two sides of the oil guide ring are matched with the end face of the stator core and the inner wall of the rear end cover to form a wire outlet end oil storage cavity, and the wire outlet end oil storage cavity is communicated with an oil ring oil injection hole of the oil guide ring and faces towards a wire outlet end lead 3-3.
And a non-outlet end oil storage cavity is formed between the spigot wall of the front end cover and the shell and between the spigot wall of the front end cover and the stator core, and the non-outlet end oil storage cavity is communicated with an end cover oil injection hole of the front end cover and faces a non-outlet end lead 3-1. The spigot wall design of the front end cover effectively simplifies the assembly structure of the stator assembly, reduces the number of parts of the stator assembly and saves the cost.
The outlet end oil storage cavity is directly communicated with the oil inlet; the outlet end oil storage cavity is communicated with the non-outlet end oil storage cavity through an open slot 3-2-2 of the stator core and a weight removing hole 3-2-1. The cooling oil enters the outlet end oil storage cavity through the oil inlet, one part of the cooling oil flows to the non-outlet end oil storage cavity through the open slot and the weight removing hole, and the other part of the cooling oil flows to the outlet end lead through the oil injection hole, so that the cooling is sufficient.
The stator assembly oil duct is designed on the stator core, and the stator core oil duct is formed by direct punch forming, so that the design and machining process of the shell oil duct are avoided, the design and manufacturing difficulty of the oil cooling structure is effectively reduced, the manufacturing is simple and convenient, and the cost is low. The stator core and the stator wire are directly immersed in oil and are forcedly sprayed with oil for cooling, so that cooling is sufficient, and the heat dissipation effect of the motor stator and the reliability of motor heat management are improved.
Preferred embodiments of the present invention are:
the oil-cooled motor stator assembly of the open type stamped sheet comprises a front end cover 1, a shell 2, a stator winding iron core 3, an oil guide ring 4, a rear end cover 5 and a screw 6; the stator winding iron core 3 mainly comprises an open type stator iron core 3-2 and conducting wires, and the parts of the conducting wires positioned at the two sides of the stator iron core are leading-out end conducting wires 3-1 and non-leading-out end conducting wires 3-2.
As shown in fig. 2 to 4, the stator core 3-2 is provided with an open slot 3-2-2, an arc surface S and a bolt hole 3-2-3 on an outer circular surface, the open slot 3-2-2 includes an arc hole R and a notch t, and a weight removing hole 3-2-1 is provided beside the bolt hole 3-2-3.
The stator core 3-2 is formed by overlapping punching sheets of the same model, the punching sheet structure is shown in figure 3, wherein an open slot 3-2-2 and a weight removing hole 3-2-1 are mainly used for circulating cooling oil, an arc surface S is used for positioning the stator core 2, a part of the cooling oil is directly contacted with the stator core 2 by a notch t for heat transfer, and the stator core structure simultaneously realizes the assembly positioning requirement and high assembly heat exchange capacity with the stator core 2.
As shown in fig. 1, 5 and 6, after a stator winding iron core 3 is installed in a casing 2, an oil guide ring 4 is installed, the oil guide ring 4 is attached to the stator winding iron core 3, two rows of oil injection holes 4-1 of the oil guide ring 4 are distributed in a staggered position along the radial direction, a circle of sealing lip I4-3 and a circle of sealing lip II 4-5 are respectively designed at two end parts, bolt holes 4-2 and through holes 4-4 are designed around the oil guide ring 4, a screw 6 sequentially penetrates through the bolt holes 4-2 and the bolt holes 3-2-3, and the oil guide ring 4 and the stator winding iron core 3 are screwed on the casing 2.
As shown in figures 1, 6, 7 and 8, a front end cover 1 and a rear end cover 5 are respectively arranged at two ends of a machine shell 2, in an assembly state, a bolt hole 4-2 is aligned with a bolt hole 3-2-3, a through hole 4-4 is aligned with a weight-removing hole 3-2-1, a sealing lip II 4-5 of an oil guide ring 4 is compressed and sealed with the end face of a stator iron core 3-2, the sealing lip I4-3 is in contact sealing with the rear end cover 5 to form a leading-out end oil storage cavity 4-6, the leading-out end oil storage cavity 4-6 is communicated with an oil injection hole 4-1 of the oil ring and faces a leading-out end lead 3-3, and the leading-out end oil storage cavity 4-6 is directly communicated with an oil inlet 2-1.
As shown in fig. 1, 5 and 8, a front end cover 1 is provided with a circle of sealing lip 1-2 at the end part of a spigot wall 1-3, two rows of end cover oil spray holes 1-1 staggered in position are radially provided on the spigot wall 1-3, the sealing lip 1-2 is in contact sealing with the end surface of a stator core 3-2 after the front end cover 1 is assembled with a casing 2 to form a non-outlet end oil storage cavity 1-4, and the non-outlet end oil storage cavity 1-4 is communicated with the end cover oil spray holes 1-1 and faces a non-outlet end lead 3-1.
As shown in FIGS. 8 and 9, the outlet-side oil reservoir chamber 4-6 and the non-outlet-side oil reservoir chamber 1-4 are communicated with the weight-reducing hole 3-2-1 through the open groove 3-2-2. Cooling oil enters the outlet end oil storage cavity 4-6 from the oil inlet 2-1, one part of the cooling oil is directly sprayed out from the oil ring oil injection hole 4-1 and flows to the outlet end lead 3-3 for cooling, the other part of the cooling oil reaches the non-outlet end oil storage cavity 1-4 through the open slot 3-2-2 and is sprayed out from the end cover oil injection hole 1-1 and flows to the outlet end lead 3-1 for cooling, and the cooling oil flows through the open slot 3-2-2 and the weight removal hole 3-2-1 and simultaneously cools the stator iron core 3-2. Furthermore, the design of the notch t enables the cooling oil to be in direct contact with the casing 2, and the auxiliary heat dissipation capacity of the casing 2 on the stator core 3-2 is improved.
The invention adopts the open type punching sheet oil duct design and the end oil injection scheme, realizes the sufficient cooling of the main heat source stator of the motor, and effectively expands the lifting space of the motor power; furthermore, the design and the processing difficulty of the structural member are further reduced based on the design and the water channel-free structure of the cooling oil channel on the stator core.
The above-mentioned features are merely for describing preferred embodiments of the present invention and may be arbitrarily combined to form a plurality of embodiments of the present invention.
The invention is described above with reference to the accompanying drawings, it is obvious that the specific implementation of the invention is not limited by the above-mentioned manner, and it is within the scope of the invention to adopt various insubstantial modifications of the inventive concept and solution, or to apply the inventive concept and solution directly to other applications without modification.
Claims (9)
1. The utility model provides an oil-cooled motor stator assembly, includes front end housing, casing, stator winding iron core and rear end cap, the stator winding iron core is established in the casing cavity that front end housing, casing and rear end cap formed, its characterized in that: the stator winding iron core comprises a stator iron core and a lead arranged on the inner edge of the iron core, a group of open slots are formed in the outer edge of the stator iron core, one end of the oil guide ring is attached to one end face of the stator iron core, the other end of the oil guide ring is attached to the inner wall of the rear end cover, an oil inlet is formed in the casing, and a group of oil ring oil injection holes are formed in the oil guide ring.
2. The oil-cooled motor stator assembly of claim 1, wherein: the inner side of the front end cover is provided with a spigot wall, the inner end of the spigot wall is provided with a front end cover sealing lip which is connected with the other end face of the stator core in a sealing mode in an attaching mode, and the spigot wall is provided with a group of end cover oil spray holes.
3. The oil-cooled motor stator assembly of claim 1, wherein: and the stator core and the oil guide ring are matched and locked and fixed on the shell through the same bolt.
4. The oil-cooled motor stator assembly of claim 1, wherein: the open slot includes circular arc hole and notch, is formed with the arc surface that is used for laminating the location with the casing inner wall between two adjacent notches.
5. The oil-cooled motor stator assembly of claim 2, wherein: and the group of oil ring oil spray holes and the group of end cover oil spray holes respectively comprise two rows of oil holes with staggered positions.
6. The oil-cooled motor stator assembly of claim 2, wherein: and sealing lips are arranged on two sides of the oil guide ring, two sides of the oil guide ring are matched with the end face of the stator core and the inner wall of the rear end cover to form a wire outlet end oil storage cavity, and the wire outlet end oil storage cavity is communicated with an oil ring oil injection hole of the oil guide ring and faces a wire of a wire outlet end.
7. The oil-cooled motor stator assembly of claim 6, wherein: and a non-leading-out end oil storage cavity is formed between the spigot wall of the front end cover and the shell and between the spigot wall of the front end cover and the stator core, and is communicated with an end cover oil injection hole of the front end cover and faces a non-leading-out end lead.
8. The oil-cooled motor stator assembly of claim 6, wherein: the outlet end oil storage cavity is directly communicated with the oil inlet.
9. The oil-cooled electric machine stator assembly of claim 7, wherein: be equipped with the arch in stator core's the outer fringe, be equipped with the bolt hole along stator core axial in the arch, be equipped with along the location iron core axial by protruding position on the stator core and go heavy hole, be linked together through stator core's open slot and heavy hole that goes between leading-out terminal oil storage chamber and the non-leading-out terminal oil storage chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111543271.8A CN114157081A (en) | 2021-12-16 | 2021-12-16 | Oil-cooled motor stator assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111543271.8A CN114157081A (en) | 2021-12-16 | 2021-12-16 | Oil-cooled motor stator assembly |
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| Publication Number | Publication Date |
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| CN114157081A true CN114157081A (en) | 2022-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111543271.8A Pending CN114157081A (en) | 2021-12-16 | 2021-12-16 | Oil-cooled motor stator assembly |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115603493A (en) * | 2022-11-02 | 2023-01-13 | 天蔚蓝电驱动科技（江苏）有限公司（Cn） | Stator oil circuit cooling device and electric drive system |
| CN116032039A (en) * | 2023-03-31 | 2023-04-28 | 天蔚蓝电驱动科技(江苏)有限公司 | Stator assembly and flat wire motor |
| EP4398462A1 (en) * | 2023-01-09 | 2024-07-10 | Delta Electronics, Inc. | Stator cooling structure of a motor |
| WO2024199003A1 (en) * | 2023-03-31 | 2024-10-03 | 天蔚蓝电驱动科技(江苏)有限公司 | Stator assembly and flat wire motor |
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| CN212649253U (en) * | 2020-06-29 | 2021-03-02 | 威睿电动汽车技术(宁波)有限公司 | Motor oil cooling device, motor assembly and vehicle |
| CN212909262U (en) * | 2020-08-03 | 2021-04-06 | 安徽威灵汽车部件有限公司 | Motor and vehicle |
| CN113241880A (en) * | 2021-05-27 | 2021-08-10 | 智新科技股份有限公司 | Oil-cooled motor with built-in oil way structure |
| CN113364166A (en) * | 2021-06-25 | 2021-09-07 | 合肥巨一动力系统有限公司 | Oil cooling structure of motor stator |
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2021
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN212649253U (en) * | 2020-06-29 | 2021-03-02 | 威睿电动汽车技术(宁波)有限公司 | Motor oil cooling device, motor assembly and vehicle |
| CN212909262U (en) * | 2020-08-03 | 2021-04-06 | 安徽威灵汽车部件有限公司 | Motor and vehicle |
| CN113241880A (en) * | 2021-05-27 | 2021-08-10 | 智新科技股份有限公司 | Oil-cooled motor with built-in oil way structure |
| CN113364166A (en) * | 2021-06-25 | 2021-09-07 | 合肥巨一动力系统有限公司 | Oil cooling structure of motor stator |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115603493A (en) * | 2022-11-02 | 2023-01-13 | 天蔚蓝电驱动科技（江苏）有限公司（Cn） | Stator oil circuit cooling device and electric drive system |
| EP4398462A1 (en) * | 2023-01-09 | 2024-07-10 | Delta Electronics, Inc. | Stator cooling structure of a motor |
| CN116032039A (en) * | 2023-03-31 | 2023-04-28 | 天蔚蓝电驱动科技(江苏)有限公司 | Stator assembly and flat wire motor |
| WO2024199003A1 (en) * | 2023-03-31 | 2024-10-03 | 天蔚蓝电驱动科技(江苏)有限公司 | Stator assembly and flat wire motor |
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