CN111953096A - Axial magnetic field motor and cooling structure thereof - Google Patents
Axial magnetic field motor and cooling structure thereof Download PDFInfo
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- CN111953096A CN111953096A CN202010952797.0A CN202010952797A CN111953096A CN 111953096 A CN111953096 A CN 111953096A CN 202010952797 A CN202010952797 A CN 202010952797A CN 111953096 A CN111953096 A CN 111953096A
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- cooling
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- phase winding
- pipe
- stator core
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- 238000001816 cooling Methods 0.000 title claims abstract description 148
- 238000004804 winding Methods 0.000 claims abstract description 55
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 210000003734 kidney Anatomy 0.000 claims 1
- 239000000110 cooling liquid Substances 0.000 abstract description 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 2
- 230000017525 heat dissipation Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 239000004519 grease Substances 0.000 description 3
- 229920001296 polysiloxane Polymers 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004382 potting Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention discloses an axial magnetic field motor and a cooling structure thereof, wherein the motor cooling structure is used for the axial magnetic field motor, the axial magnetic field motor comprises a shell, a stator core arranged in the shell and a three-phase winding arranged on the stator core, the motor cooling structure comprises a pipeline structure, the pipeline structure is arranged in the shell and comprises one or more cooling pipes, the cooling pipes are used for allowing a cooling working medium to flow through so as to cool the three-phase winding, and the pipeline structure is coiled and arranged at least one of the outer side, the inner side and the top of the three-phase winding; above-mentioned motor cooling structure, with the cooling tube directly set up in motor stator inside, be close to stator core and three-phase winding's position, it is faster to stator core and three-phase winding's heat conduction speed, when the motor operation, to letting in recirculated cooling liquid in the cooling tube, can derive the heat that stator core and three-phase winding produced fast, the heat-sinking capability of reinforcing motor helps realizing high power motor's miniaturization.
Description
Technical Field
The invention relates to the technical field of axial magnetic field motors, in particular to an axial magnetic field motor and a cooling structure thereof.
Background
With the development of the new energy automobile market, higher requirements are put forward on the miniaturization and light weight of a high-power motor. The main factor restricting the motor to achieve the purpose is the heat dissipation problem, the motor size obtained through electromagnetic calculation cannot meet the heat dissipation requirement, the size can be enlarged, the weight can be increased, and the motor is over-designed. When the motor runs, the iron core and the winding inside the motor generate much heat, and the higher the power of the motor is, the more heat is generated, which means the higher the heat dissipation pressure is.
At present, a heat dissipation water channel of an axial magnetic field motor is designed inside a motor shell, and because of the manufacturing process, a contact surface between an iron core and the shell cannot be completely attached, so that only few areas are in direct contact, and most areas are filled with heat conduction silicone grease (or heat conduction glue). The heat conductivity coefficient of the aluminum alloy shell is 167W/mK, the heat conductivity coefficient of the silicon steel sheet is 30W/mK, and the heat conductivity coefficient of the heat-conducting silicone grease (or heat-conducting glue) is 1-3W/mK. The difference between the heat conductivity coefficient of the heat-conducting silicone grease (or heat-conducting glue) and the heat.
Therefore, how to design a heat dissipation cooling structure of an axial field motor to improve the heat dissipation performance of the axial field motor becomes a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, a first objective of the present invention is to provide a motor cooling structure to improve the heat dissipation performance of an axial magnetic field motor, and facilitate the miniaturization of a high power motor.
A second object of the present invention is to provide an axial-field motor employing the above motor cooling structure.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a motor cooling structure for axial magnetic field motor, axial magnetic field motor include the casing, set up in stator core in the casing and set up in three-phase winding on the stator core, motor cooling structure includes:
the pipeline structure is arranged in the shell and comprises one or more cooling pipes, cooling working media flow through the cooling pipes to cool the three-phase winding, and the pipeline structure is coiled and arranged at least one of the outer side, the inner side and the top of the three-phase winding.
Preferably, the three-phase winding adopts an inner ring gap bridge structure, and the pipeline structure comprises an outer layer cooling pipeline coiled outside the three-phase winding and a top cooling pipeline coiled on the top of the three-phase winding.
Preferably, the outer-layer cooling pipeline and the top cooling pipeline are formed by one cooling pipe, and the cooling pipe spirally rises from the bottom to the top from the outer side of the three-phase winding and then winds around each tooth part of the stator core in an S shape.
Preferably, the cooling pipe is made of a material having a high thermal conductivity.
Preferably, the cooling pipe is made of metal or ceramic.
Preferably, the cooling pipe is made of metal having high electrical resistivity.
Preferably, the cross section of the cooling pipe is one of circular, rectangular, elliptical and kidney-shaped.
Preferably, the cross-sectional shape of each of the cooling tubes in the tube structure is the same or different, and the cross-sectional area of each of the cooling tubes in the tube structure is the same or different.
Preferably, the cooling tube is provided with heat radiating fins on the outer wall surface and/or the inner wall surface.
An axial magnetic field motor comprises the motor cooling structure, and two ends of a cooling pipe of the motor cooling structure are connected into a cooling system of the axial magnetic field motor.
In order to achieve the above object, the present invention provides a motor cooling structure for an axial magnetic field motor, the axial magnetic field motor including a casing, a stator core disposed in the casing, and a three-phase winding disposed on the stator core, the motor cooling structure including a pipeline structure, the pipeline structure being disposed in the casing, the pipeline structure including one or more cooling pipes for a cooling medium to flow through to cool the three-phase winding, the pipeline structure being disposed at least one of an outer side, an inner side, and a top of the three-phase winding in a coiled manner, the pipeline structure being capable of leaving a certain gap with the stator core and the three-phase winding, or the pipeline structure being directly attached to the stator core or the three-phase winding; above-mentioned motor cooling structure, with the cooling tube directly set up inside motor stator, be close to stator core and three-phase winding's position, set up in the inside water course of casing for prior art, it is faster to stator core and three-phase winding's heat conduction speed, when the motor operation, lets in recirculated cooling liquid in the cooling tube, can derive the heat that stator core and three-phase winding produced fast, the heat-sinking capability of reinforcing motor helps realizing high power motor's miniaturization.
The invention also provides an axial magnetic field motor, which comprises the motor cooling structure, wherein two ends of a cooling pipe of the motor cooling structure are connected with a cooling system of the axial magnetic field motor, and the motor cooling structure has the technical effect, so that the axial magnetic field motor adopting the motor cooling structure also has the technical effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a cooling structure of a motor according to an embodiment of the present invention;
fig. 2 is a top view of a motor cooling structure provided in an embodiment of the present invention;
FIG. 3 is a schematic view of a portion of FIG. 2 in the direction A-A;
fig. 4 is an exploded view of a cooling structure of a motor according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a winding inner ring gap bridge structure;
FIG. 6 is an exploded view of a stator structure with three-phase windings in an inner ring gap bridge structure;
FIG. 7 is a schematic diagram of a stator structure with three-phase windings in an inner ring gap bridge structure;
fig. 8 is a partial cross-sectional view of fig. 7.
In the figure:
1 is a shell; 2 is a stator core; 3 is a three-phase winding; 3a, 3b and 3c are U, V, W phase windings respectively; 4 is a cooling pipe; 401 is an outer layer cooling pipeline; 402 is a top cooling circuit.
Detailed Description
One of the cores of the present invention is to provide a motor cooling structure, which can improve the heat dissipation performance of an axial magnetic field motor and facilitate the miniaturization of a high power motor.
The invention also provides an axial magnetic field motor based on the motor cooling structure.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 4, fig. 1 is a schematic view of a motor cooling structure according to an embodiment of the present invention, fig. 2 is a top view of the motor cooling structure according to the embodiment of the present invention, fig. 3 is a partial schematic view of the motor cooling structure in a direction a-a in fig. 2, and fig. 4 is an exploded view of the motor cooling structure according to the embodiment of the present invention.
The embodiment of the invention provides a motor cooling structure, which is used for an axial magnetic field motor, and comprises a machine shell 1, a stator core 2 arranged in the machine shell 1 and a three-phase winding 3 arranged on the stator core 2, wherein the motor cooling structure comprises a pipeline structure, the pipeline structure is arranged in the machine shell 1, the pipeline structure comprises one or more cooling pipes 4, the cooling pipes 4 are used for allowing a cooling working medium to flow through so as to cool the three-phase winding 3, the pipeline structure is coiled and arranged at least one of the outer side, the inner side and the top of the three-phase winding 3, a certain gap can be left between the pipeline structure and the stator core 2 and the three-phase winding 3, or the pipeline structure can be directly attached to the stator core 2 or the three-phase winding 3.
Compared with the prior art, the motor cooling structure provided by the invention has the advantages that the cooling pipe 4 is directly arranged in the motor stator and at the position close to the stator core 2 and the three-phase winding 3, the heat conduction speed of the stator core 2 and the three-phase winding 3 is higher, when the motor runs, circulating cooling liquid is introduced into the cooling pipe 4, the heat generated by the stator core 2 and the three-phase winding 3 can be rapidly led out, the heat dissipation capacity of the motor is enhanced, and the miniaturization of a high-power motor is facilitated.
It can be understood that the longer the length of the cooling pipe 4 included in the pipe structure inside the stator is, the more the cooling working medium is contained therein, the larger the contact area with the stator core 2 and the three-phase winding 3 is, therefore, in the embodiment of the present invention, the three-phase winding 3 adopts the inner ring bridge structure, as shown in fig. 5 to 7, so that the space B with a regular shape can be formed between the outer side of the three-phase winding 3 and the casing 1, and the space C with a certain height can be formed between the top of the three-phase winding 3 and the casing 1, and the pipe structure can be disposed in the space B and the space C, as shown in fig. 8.
After the pipeline structure is arranged, as shown in fig. 1-3, potting adhesive is filled in the casing 1, stator potting is performed, and after baking and curing, the three-phase winding 3, the stator core 2 and the cooling pipe 4 can be fixed in the stator. It can be seen that the cooling pipe 4 is very close to the three-phase winding 3, as shown in fig. 3, when the motor operates, a cooling working medium is introduced into the cooling pipe 4, so that heat generated by the stator core 2 and the three-phase winding 3 can be rapidly led out, and heat dissipation of the motor is realized.
The length of the cooling pipe 4 included in the pipeline structure inside the stator can be increased by making the three-phase winding 3 adopt an inner ring gap bridge structure, the pipeline structure includes an outer layer cooling pipeline 401 wound outside the three-phase winding 3 and a top cooling pipeline 402 wound on the top of the three-phase winding 3, the top cooling pipeline 402 and the outer layer cooling pipeline 401 can be the same cooling pipe 4 or two cooling pipes 4, as shown in fig. 4, in one embodiment of the invention, the top cooling pipeline 402 and the outer layer cooling pipeline 401 are the same cooling pipe 4, the cooling pipe 4 spirally rises from the bottom to the top outside of the three-phase winding 3 and then spirally bypasses each tooth part of the stator core 2 in an S shape, as can be seen from fig. 3 and 4, the outer layer cooling pipeline 401 is spirally upper layer and each layer of pipelines is closely adjacent, the top cooling pipeline 402 sequentially bypasses each tooth part of the stator core 2 in an S shape and is closely adjacent to the top of the three-phase winding 3, there may be a gap or direct contact between the two.
Of course, the cooling pipe 4 may be provided inside the three-phase winding 3 if conditions permit, and is not limited herein.
Further optimizing the technical scheme, in the embodiment of the invention, in order to ensure the heat transfer efficiency, the cooling pipe 4 is made of a material with high heat conductivity coefficient, at present, the common material with high heat conductivity coefficient is metal and ceramic, and the heat conductivity coefficient is 30-200W/mK, so the cooling pipe 4 can be made of metal or ceramic, but considering that the cooling pipe 4 is a hollow pipeline and has a complex shape, the cooling pipe 4 made of a ceramic material can only be integrally sintered by using a mold and a sand core, the process is complex, the finished product rate is low, and the cost is high, therefore, in the embodiment of the invention, the cooling pipe 4 is preferably made of a metal material with toughness and ductility, and can be bent by using a metal hollow pipe according to requirements to form the cooling pipe 4, the process is simple, the finished product rate is high, and compared with the ceramic material, the strength, the impact resistance is also better.
However, the cooling pipe 4 made of metal material causes eddy current loss during operation of the motor, and in order to control the eddy current loss within an acceptable range, it is required to use the metal cooling pipe 4 with the highest resistivity and the lowest wall thickness, that is, the cooling pipe 4 is preferably made of metal with high resistivity. However, too thin a wall thickness is not suitable and is prone to cracking during bending. Therefore, the selection of the wall thickness needs to balance the two aspects, and the calculation and selection are carried out according to the specific motor design parameters and the pipe diameter size.
Further optimizing the above technical solution, the cross section of the cooling pipe 4 may be one of circular, rectangular, elliptical and kidney-shaped, the cross section shapes of the cooling pipes 4 in the pipeline structure of the axial magnetic field motor may be the same or different, or one of the cooling pipes 4 may have one cross section shape, and the other cooling pipes 4 may have another shape.
Further, if the duct structure includes a plurality of cooling pipes 4, each of the cooling pipes 4 may have the same cross-sectional shape and cross-sectional area, or each of the cooling pipes 4 in the duct structure may have a different cross-sectional shape and/or a different cross-sectional area depending on the space in the motor and the amount of heat dissipated from the cooling position.
Further optimizing the above technical scheme, in order to improve the heat exchange efficiency, in the embodiment of the present invention, the outer wall surface and/or the inner wall surface of the cooling tube 4 is/are provided with the heat dissipation fins.
If the radiating fins are arranged on the inner wall surface of the cooling tube 4, in order to reduce the resistance to the cooling working medium, the length direction of the radiating fins should be arranged along the extension direction of the cooling tube 4; if the heat radiating fins are provided on the outer wall surface of the cooling tube 4, the longitudinal direction of the heat radiating fins may be provided along the extending direction of the cooling tube 4, or may be provided at intervals along the extending direction of the cooling tube 4.
The embodiment of the invention also provides an axial magnetic field motor, which comprises the motor cooling structure, wherein two ends of the cooling pipe 4 of the motor cooling structure are connected with a cooling system of the axial magnetic field motor, and the axial magnetic field motor adopts the motor cooling structure in the embodiment, so the technical effect of the axial magnetic field motor is referred to the embodiment.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a motor cooling structure for axial magnetic field motor, axial magnetic field motor include the casing, set up in stator core in the casing and set up in three-phase winding on the stator core, its characterized in that, motor cooling structure includes:
the pipeline structure is arranged in the shell and comprises one or more cooling pipes, cooling working media flow through the cooling pipes to cool the three-phase winding, and the pipeline structure is coiled and arranged at least one of the outer side, the inner side and the top of the three-phase winding.
2. The motor cooling structure according to claim 1, wherein the three-phase winding adopts an inner-ring bridge structure, and the pipe structure includes an outer-layer cooling pipe wound around an outer side of the three-phase winding and a top-portion cooling pipe wound around a top portion of the three-phase winding.
3. The motor cooling structure according to claim 2, wherein the outer-layer cooling line and the top-portion cooling line are formed by one cooling pipe, and the cooling pipe spirally rises from the bottom to the top from the outside of the three-phase winding and then passes around each tooth portion of the stator core in an S-shape.
4. The motor cooling structure according to any one of claims 1 to 3, wherein the cooling pipe is made of a material having a high thermal conductivity.
5. The motor cooling structure according to claim 4, wherein the cooling pipe is made of metal or ceramic.
6. The motor cooling structure according to claim 5, wherein the cooling pipe is made of a metal having a high electrical resistivity.
7. The motor cooling structure according to any one of claims 1 to 3 and 5 to 6, wherein the cooling pipe has a cross section of one of a circular shape, a rectangular shape, an oval shape, and a kidney shape.
8. The motor cooling structure according to claim 7, wherein the cross-sectional shape of each of the cooling pipes in the pipe line structure is the same or different, and the cross-sectional area of each of the cooling pipes in the pipe line structure is the same or different.
9. The motor cooling structure according to any one of claims 1 to 3, 5 to 6, and 8, wherein a heat radiating fin is provided on an outer wall surface and/or an inner wall surface of the cooling pipe.
10. An axial field motor comprising the motor cooling structure according to any one of claims 1 to 9, wherein both ends of a cooling pipe of the motor cooling structure are connected to a cooling system of the axial field motor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010952797.0A CN111953096A (en) | 2020-09-11 | 2020-09-11 | Axial magnetic field motor and cooling structure thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010952797.0A CN111953096A (en) | 2020-09-11 | 2020-09-11 | Axial magnetic field motor and cooling structure thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112636498A (en) * | 2020-12-29 | 2021-04-09 | 浙江盘毂动力科技有限公司 | Motor stator cooling device and motor |
| CN112688522A (en) * | 2021-01-15 | 2021-04-20 | 东南大学 | High-power-density axial magnetic field permanent magnet motor structure |
| CN112688448A (en) * | 2020-12-29 | 2021-04-20 | 浙江盘毂动力科技有限公司 | Cooling medium discharging structure of double-stator motor |
| CN112821644A (en) * | 2021-01-29 | 2021-05-18 | 上海电机学院 | Water cooling system of disc type coreless permanent magnet motor |
| WO2024036659A1 (en) * | 2022-08-16 | 2024-02-22 | 浙江盘毂动力科技有限公司 | Cooling structure, stator, axial magnetic field motor, and assembly method thereof |
| EP4287462A4 (en) * | 2021-02-01 | 2025-01-15 | Weg Equipamentos Eletricos S A | ELECTRICAL AXIAL FLUX MACHINE AND METHOD FOR MOUNTING A STATOR OF AN ELECTRICAL AXIAL FLUX MACHINE |
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