CN111864928A - Motor stator, manufacturing method thereof and motor - Google Patents
Motor stator, manufacturing method thereof and motor Download PDFInfo
- Publication number
- CN111864928A CN111864928A CN201910345324.1A CN201910345324A CN111864928A CN 111864928 A CN111864928 A CN 111864928A CN 201910345324 A CN201910345324 A CN 201910345324A CN 111864928 A CN111864928 A CN 111864928A
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- Prior art keywords
- stator
- sectional area
- motor
- stator winding
- cross
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000004804 winding Methods 0.000 claims abstract description 91
- 239000004020 conductor Substances 0.000 claims abstract description 47
- 238000009826 distribution Methods 0.000 claims abstract description 18
- 238000003466 welding Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 abstract description 4
- 238000013021 overheating Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
Images
Classifications
-
- 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
- H02K1/16—Stator cores with slots for windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/024—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with slots
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/06—Embedding prefabricated windings in machines
- H02K15/062—Windings in slots; salient pole windings
- H02K15/064—Windings consisting of separate segments, e.g. hairpin windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
The application provides a motor stator, a manufacturing method thereof and a motor. The motor stator includes: a stator core body provided with a plurality of slots distributed in a circumferential direction in an axial direction; the stator winding comprises a plurality of formed conductors, each formed conductor is inserted into each groove of the stator core body, and the formed conductors are welded with each other to form a passage; the sectional area of the stator winding is related to the temperature distribution state of the motor stator in an application scene, so that the sectional area of the stator winding of the motor stator at a lower operation temperature is smaller than that of the stator winding of the motor stator at a higher operation temperature. According to the technical scheme of this application, effectively alleviate motor stator and motor local overheat problem under the applied scene on the one hand, on the other hand has effectively reduced the material cost of this type of motor stator.
Description
Technical Field
The application relates to the field of motors, in particular to a motor stator and a manufacturing method thereof.
Background
Electric machines are a widely used type of power source component in the prior art and typically include a rotor and a stator that cooperate to generate a magnetic field. In practical application scenarios, the motor usually faces uneven heat dissipation effect during operation, which results in uneven temperature distribution, which may possibly cause local temperature overheating of the motor stator and the motor rotor. This would therefore require the stator of the machine to have its windings made of a highly insulating material, otherwise the current therein would be limited by local overheating. Such manufacturing materials would result in high manufacturing costs.
Disclosure of Invention
Accordingly, the present invention is directed to a stator for an electric motor, a method of manufacturing the stator for an electric motor, and an electric motor that substantially obviate or mitigate one or more of the above problems and other problems in the art.
To solve one of the above technical problems, according to an aspect of the present application, there is provided a stator of a motor, including: a stator core body provided with a plurality of slots distributed in a circumferential direction in an axial direction; the stator winding comprises a plurality of molded conductors, each molded conductor is inserted into each groove of the stator core body, and the molded conductors are welded with each other to form a passage; wherein the cross-sectional area of the stator winding is linked to the temperature distribution state of the motor stator in an application scenario such that the stator winding cross-sectional area of the motor stator at lower operating temperature is smaller than the stator winding cross-sectional area of the motor stator at higher operating temperature.
According to another aspect of the present application, there is provided an electric machine comprising an electric machine stator as described above; and a motor housing; the motor stator is arranged in the motor shell.
According to still another aspect of the present application, there is provided a method of manufacturing a stator of an electric motor including a stator core and a stator winding; wherein the manufacturing method comprises: a plurality of grooves distributed along the circumferential direction are arranged in the axial direction of the stator core body; respectively inserting a plurality of molded conductors of the stator winding into the groove bodies of the stator core, and welding the molded conductors to form a passage; and associating the sectional area of the stator winding to the temperature distribution state of the motor stator in an application scene, so that the sectional area of the stator winding of the motor stator at a lower operation temperature is smaller than that of the stator winding of the motor stator at a higher operation temperature.
According to the technical scheme of the application, a motor stator, a manufacturing method thereof and a motor are provided. It meets the stator winding cross-sectional area requirements of different sections by separately producing a plurality of identical or different shaped conductors and then insert welding on the stator core to form an arrangement of stator winding cross-sectional area as a function of temperature. On one hand, the problem of local overheating of the motor stator and the motor in an application scene is effectively solved, and on the other hand, the material cost of the motor stator is reduced.
Drawings
The present application will be more fully understood from the detailed description given below with reference to the accompanying drawings, in which like reference numerals refer to like elements in the figures. Wherein:
FIG. 1 illustrates a schematic view from a first perspective of an embodiment of a stator of an electric machine;
FIG. 2 illustrates a second perspective view of an embodiment of a stator of an electric machine;
FIG. 3 shows a schematic view of an embodiment of an electric machine;
fig. 4 shows a schematic view of another embodiment of the motor.
Detailed Description
Referring to fig. 1 to 4, an embodiment of a stator of an electric machine is provided. Fig. 1 to 2 are used to schematically illustrate the general structure of such a stator winding formed by a profiled conductor (bar winding) 121. While figures 3 to 4 are used to schematically illustrate how the cross-sectional area of such a shaped conductor varies along the temperature distribution in the machine.
Specifically, the motor stator 100 includes a stator core 110 and a stator winding 120. The stator core 110 has a plurality of slots 111 on an axial surface, and the plurality of slots 111 are uniformly distributed along a circumferential direction of the stator core 110.
On the other hand, as for this stator winding 120, it may be formed by first inserting a plurality of shaped conductors 121 into the respective slots 111 of the stator core 110, and then welding the adjacent ends of the respective shaped conductors. For example, fig. 1 and 2 are schematic views of a plurality of molded conductors 121 that have been assembled on a stator core 110, and respectively show both ends of the stator core 110 in the axial direction. As can be seen from fig. 1, each of the illustrated shaped conductors 121 is shaped as a U-shaped conductor, and fig. 2 shows both ends of the respective U-shaped conductor at the second side. As can be seen in fig. 2, after insertion of each U-shaped conductor is completed according to certain winding design rules, its adjacent ends are welded and then optionally coated at weld points 122, thereby forming the illustrated stator winding 120 that is completely assembled to the stator core 110. As an alternative, the shaped conductors may be I-shaped conductors, and in fact, two mating I-shaped conductors may be formed into corresponding U-shaped conductors by adding an additional weld, thereby forming a structure similar to that shown in the figures.
This form of stator winding provides a product basis for easy adjustment of the cross-sectional area of the motor stator, as each shaped conductor in the stator winding can be produced independently and in bulk by a die, to meet the stator winding cross-sectional area requirements of different sections separately, and then the arrangement of the stator winding cross-sectional area as a function of temperature is formed by insertion and welding on the stator core. Therefore, the sectional area of the stator winding is simply and feasibly related to the temperature distribution state of the motor stator in an application scene, so that the sectional area of the stator winding of the motor stator at a lower operation temperature is smaller than that of the stator winding of the motor stator at a higher operation temperature. Due to the structural arrangement, on one hand, the problem of local overheating of the motor stator and the motor in an application scene is effectively solved, and on the other hand, the material cost of the motor stator is effectively reduced.
With regard to the foregoing embodiments, it should be appreciated that the assembly between the winding and the core of the motor stator should be generally completed before the motor stator or the motor with the motor stator is applied to an actual scene, that is, the sectional area of the stator winding should be adjusted before the motor stator or the motor with the motor stator is applied to an actual scene, so that the sectional area is set to correspond to the temperature high and low states which can be handled here. Therefore, the sectional area of the stator winding obtained in association with the "temperature distribution state of the motor stator in the application scene" mentioned in the scheme generally refers to a value of change of the sectional area of the stator winding, which is measured after the simulation of such a scene. Of course, the stator winding sectional area variation value obtained by performing trial production on a small batch of products in a standard specification or a specification adjusted by simulation and performing experimental adjustment on the small batch of products in an actual application scene can be used. In connection with the above, it should be clear to a person skilled in the art that the present application aims to emphasize the correlation of the stator winding cross-sectional area with the temperature distribution of the motor stator, and does not necessarily limit the way in which this temperature is obtained to the actual measured temperature after application of the motor stator.
Furthermore, there are several implementations as to how the stator winding cross-sectional area requirements of different sections can be met by adjusting the shaped conductors, respectively. As will be exemplarily explained below.
For example, as one implementation, the variation in cross-sectional area of the stator winding 120 may be embodied as a variation in cross-sectional area of the shaped conductor 121. In other words, the individual shaped conductor 121 can first be designed in a structural form with a cross-sectional area that varies with the temperature distribution, and then the shaped conductor can be mass-produced, which can be directly used to vary the cross-sectional area of the stator winding in the axial direction. For another example, the molded conductors with different sectional area specifications can be directly produced and manufactured, and then the molded conductors with different specifications are adaptively provided according to the temperature distribution of different positions of the stator core; alternatively, it is also possible to simply produce profiled wire sections of both large and small dimensions and then provide the large-sized profiled wire section directly at the higher temperature and the small-sized profiled wire section directly at the lower temperature, which can be used directly to vary the cross-sectional area of the stator winding in the circumferential direction.
In addition, for current motors, the stator winding of each standard motor usually has a reference cross-sectional area with a fixed standard. At this time, the solution contemplated by the present application can be applied by making appropriate adjustments thereto, thereby increasing the applicable range of the solution. For example, referring to fig. 3, as one implementation, the stator winding sectional area W2 of the motor stator 100 where the operating temperature is higher may be set to be larger than the reference sectional area W1 of the stator winding 120. Referring to fig. 4, as another implementation, the stator winding cross-sectional area W3 of the motor stator 100 at a lower operating temperature may be set smaller than the reference cross-sectional area W1 of the stator winding. Alternatively, the modifications of the two embodiments can be made simultaneously, so that the cross-sectional area of the stator winding is adjusted to best match the temperature distribution.
Further, as a specific way of structural arrangement of the sectional area along with the temperature distribution, the sectional area of the stator winding 120 may be set to vary along the axial direction of the motor stator 100, so that the axial sectional area of the stator winding 120 at a lower operating temperature of the motor stator 100 is smaller than the axial sectional area of the stator winding 120 at a higher operating temperature of the motor stator 100.
With continued reference to fig. 3 and 4, a motor 200 employing such a motor stator 100 is also shown. The motor may include a motor housing (not shown), and a motor stator 100, a motor rotor 210, and a rotor 220 sequentially disposed in the housing from outside to inside. The motor stator 100 is the motor stator in any of the foregoing embodiments or a combination thereof. In this case, since each component of the motor is disposed in the housing, it is generally not in direct contact with the cooling medium. In this case, the problem of uneven temperature distribution of the motor stator of a general specification is particularly serious, and the motor stator of the foregoing embodiment or the combination thereof can be used to well alleviate the problem.
Accordingly, in order to provide the motor stator which is convenient to produce and manufacture, does not increase high cost and can effectively relieve uneven temperature distribution, a manufacturing method of the motor stator is further provided. The method can be used for manufacturing the motor stator in the foregoing embodiments or the combination thereof, and can be used for manufacturing other motor stators, and such motor stators at least include a stator core and a stator winding. Specifically, the method for manufacturing the motor stator comprises the following steps: firstly, a plurality of groove bodies distributed along the circumferential direction are arranged in the axial direction of a stator core body; and then respectively inserting a plurality of molded conductors of the stator winding into the groove bodies of the stator core, and welding the molded conductors to form a passage. The sectional area of the stator winding with the plurality of molded conductors is related to the temperature distribution state of the motor stator in an application scene, so that the sectional area of the stator winding of the motor stator at a lower operation temperature is smaller than that of the stator winding of the motor stator at a higher operation temperature. The motor stator thus produced can meet the stator winding cross-sectional area requirements of different sections by individually producing a plurality of shaped conductors and then insert welding on the stator core to form an arrangement of stator winding cross-sectional area as a function of temperature. The manufacturing method effectively relieves the problem of local overheating of the motor stator and the motor in an application scene, effectively reduces the manufacturing cost of the motor stator and improves the manufacturing efficiency of the motor stator.
Furthermore, there may be multiple implementations as to how the stator winding cross-sectional area requirements of different sections are met by adjusting the shaped conductors, respectively, for example, a change in the cross-sectional area of the stator winding 120 may be reflected as a change in the cross-sectional area of the shaped conductor 121, and so on. Specific examples thereof have been mentioned in the foregoing description of some alternatives of the stator of the electrical machine and will not be repeated here.
Similarly, for current motors, the windings of the motor stator of each size motor will typically have a fixed size reference cross-sectional area. At this time, the solution contemplated by the present application can be applied by making appropriate adjustments thereto, thereby increasing the applicable range of the solution. Specifically, the stator winding cross-sectional area of the motor stator at a lower operating temperature may be set smaller than the reference cross-sectional area of the stator winding. As another example, the sectional area of the stator winding of the motor stator at a higher operating temperature may be set larger than the reference sectional area of the stator winding. Alternatively, the modifications of the two embodiments can be made simultaneously, so that the cross-sectional area of the stator winding is adjusted to best match the temperature distribution.
In addition, as a specific mode of structural arrangement of which the sectional area is distributed along with the temperature, the sectional area of the stator winding can be changed along the axial direction of the motor stator, so that the axial sectional area of the stator winding of the motor stator at a lower operation temperature is smaller than the axial sectional area of the stator winding of the motor stator at a higher operation temperature.
The above detailed description is merely illustrative of the present application and is not intended to be limiting. In the present application, relative terms such as left, right, up, and down are used to describe relative positional relationships, and are not intended to limit absolute positions. Various changes and modifications can be made by one skilled in the art without departing from the scope of the present application, and all equivalent technical solutions also belong to the scope of the present application, and the protection scope of the present application should be defined by the claims.
Claims (10)
1. An electric machine stator, comprising:
a stator core body provided with a plurality of slots distributed in a circumferential direction in an axial direction; and
the stator winding comprises a plurality of molded conductors, each molded conductor is respectively inserted into each groove body of the stator core body, and the molded conductors are mutually welded to form a passage;
Wherein the cross-sectional area of the stator winding is linked to the temperature distribution state of the motor stator in an application scenario such that the stator winding cross-sectional area of the motor stator at lower operating temperature is smaller than the stator winding cross-sectional area of the motor stator at higher operating temperature.
2. The electric machine stator of claim 1, wherein the variation in cross-sectional area of the stator winding comprises a variation in cross-sectional area of a single of the shaped conductors; and/or a variation in cross-sectional area between a plurality of the shaped conductors.
3. The electric machine stator of claim 1, wherein the electric machine stator has a reference cross-sectional area; wherein a stator winding sectional area of the motor stator at a lower operating temperature is set smaller than a reference sectional area of the stator winding; and/or the stator winding cross-sectional area of the motor stator at a higher operating temperature is set larger than the reference cross-sectional area of the stator winding.
4. A motor stator according to any one of claims 1 to 3, wherein the cross-sectional area of the stator winding varies in the axial direction of the motor stator such that the axial cross-sectional area of the stator winding at a lower operating temperature of the motor stator is smaller than the axial cross-sectional area of the stator winding at a higher operating temperature of the motor stator.
5. A motor stator according to any one of claims 1 to 3, wherein the shaped conductor is shaped as a U-shaped conductor or an I-shaped conductor.
6. An electric machine, comprising: the motor stator of any one of claims 1 to 5; and a motor housing; the motor stator is arranged in the motor shell.
7. A method of manufacturing a motor stator, the motor stator comprising a stator core and a stator winding; characterized in that the manufacturing method comprises: a plurality of grooves distributed along the circumferential direction are arranged in the axial direction of the stator core body; respectively inserting a plurality of molded conductors of the stator winding into the groove bodies of the stator core, and welding the molded conductors to form a passage; and associating the sectional area of the stator winding to the temperature distribution state of the motor stator in an application scene, so that the sectional area of the stator winding of the motor stator at a lower operation temperature is smaller than that of the stator winding of the motor stator at a higher operation temperature.
8. The method of manufacturing of claim 7, wherein varying the cross-sectional area of the stator windings comprises varying the cross-sectional area of individual ones of the shaped conductors; and/or varying the cross-sectional area of a plurality of the shaped conductors.
9. The manufacturing method according to claim 7, wherein the motor stator has a reference sectional area; wherein a stator winding sectional area of the motor stator at a lower operating temperature is set smaller than a reference sectional area of the stator winding; and/or the stator winding cross-sectional area of the motor stator at a higher operating temperature is set larger than the reference cross-sectional area of the stator winding.
10. The manufacturing method according to claim 7, wherein a sectional area of the stator winding is changed in an axial direction of the motor stator so that an axial sectional area of the stator winding of the motor stator at a lower operating temperature is smaller than an axial sectional area of the stator winding of the motor stator at a higher operating temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910345324.1A CN111864928A (en) | 2019-04-26 | 2019-04-26 | Motor stator, manufacturing method thereof and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910345324.1A CN111864928A (en) | 2019-04-26 | 2019-04-26 | Motor stator, manufacturing method thereof and motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111864928A true CN111864928A (en) | 2020-10-30 |
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ID=72952470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910345324.1A Pending CN111864928A (en) | 2019-04-26 | 2019-04-26 | Motor stator, manufacturing method thereof and motor |
Country Status (1)
| Country | Link |
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| CN (1) | CN111864928A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010011851A1 (en) * | 1998-11-20 | 2001-08-09 | Group Art Unit 2834 | Stator of AC generator for use in vehicle and method of manufacturing the same |
| JP2001245447A (en) * | 1999-12-20 | 2001-09-07 | Denso Corp | Rotary electric machine of stator-elasticity holding type |
| JP2006014471A (en) * | 2004-06-25 | 2006-01-12 | Aisin Seiki Co Ltd | Motor |
| JP2011135733A (en) * | 2009-12-25 | 2011-07-07 | Aisin Seiki Co Ltd | Rotating electric machine |
| US20150084449A1 (en) * | 2013-09-26 | 2015-03-26 | Mitsubishi Electric Corporation | Rotary electric machine |
| CN104737421A (en) * | 2012-10-19 | 2015-06-24 | 丰田自动车株式会社 | Stator of rotary electric machine |
| EP3121938A1 (en) * | 2015-07-20 | 2017-01-25 | Rolls-Royce plc | Electrical machines |
| WO2018141814A1 (en) * | 2017-02-02 | 2018-08-09 | Safran Electrical & Power | Stator winding for an electrical machine |
-
2019
- 2019-04-26 CN CN201910345324.1A patent/CN111864928A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010011851A1 (en) * | 1998-11-20 | 2001-08-09 | Group Art Unit 2834 | Stator of AC generator for use in vehicle and method of manufacturing the same |
| JP2001245447A (en) * | 1999-12-20 | 2001-09-07 | Denso Corp | Rotary electric machine of stator-elasticity holding type |
| JP2006014471A (en) * | 2004-06-25 | 2006-01-12 | Aisin Seiki Co Ltd | Motor |
| JP2011135733A (en) * | 2009-12-25 | 2011-07-07 | Aisin Seiki Co Ltd | Rotating electric machine |
| CN104737421A (en) * | 2012-10-19 | 2015-06-24 | 丰田自动车株式会社 | Stator of rotary electric machine |
| US20150084449A1 (en) * | 2013-09-26 | 2015-03-26 | Mitsubishi Electric Corporation | Rotary electric machine |
| EP3121938A1 (en) * | 2015-07-20 | 2017-01-25 | Rolls-Royce plc | Electrical machines |
| WO2018141814A1 (en) * | 2017-02-02 | 2018-08-09 | Safran Electrical & Power | Stator winding for an electrical machine |
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