CN108462318B - Motor cooling structure, power motor and electric drive system - Google Patents
Motor cooling structure, power motor and electric drive system Download PDFInfo
- Publication number
- CN108462318B CN108462318B CN201710095454.5A CN201710095454A CN108462318B CN 108462318 B CN108462318 B CN 108462318B CN 201710095454 A CN201710095454 A CN 201710095454A CN 108462318 B CN108462318 B CN 108462318B
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- Prior art keywords
- liquid
- motor
- liquid cooling
- cooling structure
- rotor
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- 238000001816 cooling Methods 0.000 title claims abstract description 147
- 239000007788 liquid Substances 0.000 claims abstract description 153
- 238000004804 winding Methods 0.000 claims description 13
- 239000000110 cooling liquid Substances 0.000 claims description 9
- 239000003822 epoxy resin Substances 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 5
- 230000009977 dual effect Effects 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 5
- 230000013011 mating Effects 0.000 claims 1
- 230000017525 heat dissipation Effects 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention relates to a motor cooling structure, a power motor comprising the same and an electric drive system. The motor cooling structure comprises a rotor liquid cooling structure, the rotor liquid cooling structure comprises a hollow blind hole located in a rotor rotating shaft, a liquid cooling pipeline is arranged in the hollow blind hole, a first end opening of the liquid cooling pipeline extends out of the blind end of the hollow blind hole, a second end opening of the liquid cooling pipeline extends out of the open end of the hollow blind hole, and the hollow blind hole and the liquid cooling pipeline form a liquid cooling flow path of the rotor liquid cooling structure.
Description
Technical Field
The invention relates to the technical field of power motors; in particular, the invention relates to a motor cooling structure, a power motor and an electric drive system.
Background
Taking an electric vehicle as an example, a power motor thereof is required to have high power/torque density, high efficiency, and high reliability as much as possible. During design, the selection of the electromagnetic load and the thermal load of the motor tends to be limited, so that the loss and the heat productivity of a unit volume are obviously increased, and the power, the torque density, the efficiency, the performance of an insulating material, the service life and the reliability of the motor are obviously influenced.
Therefore, the cooling heat dissipation of the power motor must be improved, a cooling system must be reasonably selected and arranged, local hot spots are avoided, and the heat in the motor must be fully discharged. On the premise of ensuring the safe and reliable operation of the motor, the potential of the motor is fully excavated, so that the performance of the motor is brought into full play.
For an induction motor, as current is induced on a rotor, the rotor generates larger heat, and generally, the heat dissipation of the rotor is difficult, and the temperature rise of the rotor is higher; meanwhile, the rotating speed of the power motor is usually very high, and reaches 15000rpm, the loss of the bearing is increased under the high-speed running condition, and the temperature of the bearing is overhigh by considering the heat conduction of the temperature rise of the rotor, so that the overhigh temperature of the bearing is easily generated, and the service life of the bearing is seriously influenced.
Currently, most of power motors are cooled by a shell liquid cooling method, and a shell is usually an outer shell and an inner shell which are installed together through a shrink fit to form a built-in spiral or S-shaped or other-shaped cooling loop; the stator winding of the motor generally adopts a vacuum dip coating technology.
Disclosure of Invention
The object of the present invention is to provide a cooling structure for an electric machine that overcomes the aforementioned drawbacks of the prior art.
Further, the invention also aims to provide a power motor and an electric drive system comprising the motor cooling structure.
In order to achieve the foregoing object, a first aspect of the present invention provides a motor cooling structure, where the motor cooling structure includes a rotor liquid cooling structure, the rotor liquid cooling structure includes a hollow blind hole located in a rotor rotating shaft, a liquid cooling pipeline is disposed in the hollow blind hole, a first end opening of the liquid cooling pipeline extends out of a blind end of the hollow blind hole, a second end opening of the liquid cooling pipeline extends out of an open end of the hollow blind hole, and the hollow blind hole and the liquid cooling pipeline form a liquid cooling flow path of the rotor liquid cooling structure.
Optionally, in the motor cooling structure as described above, an end of the liquid cooling pipe having the second end opening is fixed to a motor casing or a motor end cover.
Optionally, in the motor cooling structure as described above, the motor cooling structure further includes a stator liquid cooling structure, and the stator liquid cooling structure is in fluid communication with the rotor liquid cooling structure.
Optionally, in the motor cooling structure as described above, the stator liquid cooling structure includes a double-helix liquid cooling loop at the motor casing.
Optionally, in the motor cooling structure as described above, the double spiral liquid cooling circuit is integrally die-cast in the motor casing.
Optionally, in the motor cooling structure as described above, the motor casing includes an outer casing and an inner casing which are nested, and the double-spiral liquid cooling loop is formed by the outer casing and the inner casing which are nested in cooperation.
Alternatively, in the motor cooling structure as described above, the double-spiral liquid cooling circuit has two single-spiral flow paths connected in parallel, and the single-spiral flow paths have a common liquid inlet and different liquid outlets.
Optionally, in the motor cooling structure as described above, the second end opening of the liquid cooling pipe is connected to the liquid discharge port of one of the two single-spiral flow paths via the liquid inlet of the rotor liquid cooling structure.
Optionally, in the motor cooling structure as described above, an open end of the hollow blind hole is connected to a liquid discharge port of one of the two single-spiral flow paths via a liquid inlet of the rotor liquid cooling structure.
Optionally, in the motor cooling structure as described above, the motor cooling structure further includes an epoxy resin that is plastic-encapsulated at the stator end winding of the motor, and the epoxy resin is located between the stator end winding and the motor casing.
In order to achieve the foregoing object, a second aspect of the present invention provides a power motor, wherein the power motor includes the motor cooling structure according to any one of the foregoing first aspects.
In order to achieve the aforementioned object, a third aspect of the present invention provides an electric drive system, wherein the electric drive system comprises an electric machine as described in the aforementioned second aspect.
Drawings
The disclosure of the present invention will be more apparent with reference to the accompanying drawings. It is to be understood that these drawings are solely for purposes of illustration and are not intended as a definition of the limits of the invention. In the figure:
FIG. 1 is a schematic cross-sectional view of one embodiment of a power motor according to the present invention;
FIG. 2 is a U-shaped motor casing with an integrated double-helix liquid cooling loop of the power motor of FIG. 1;
FIG. 3 is a double helix liquid cooling loop at the motor housing of FIG. 2; and
fig. 4 is a schematic view of a rotor liquid cooling structure of the power motor in fig. 1.
Detailed Description
The following describes in detail a specific embodiment of the present invention with reference to the drawings. In the drawings, the same reference numerals indicate the same or corresponding features.
FIG. 1 is a schematic cross-sectional view of one embodiment of a power motor according to the present invention. As can be seen from the figure, the power motor comprises a motor casing 1, a stator winding 2, a stator core 3, a motor end cover 5, a rotor core 6 and the like.
In the figure, a stator winding 2 is embedded in a stator core 3, the stator core 3 is assembled on a motor shell 1 through a shrink fit, and a motor end cover 5 is connected with the motor shell 1 through a bolt. The motor casing 1 may have a stator liquid cooling structure built therein. When the motor operates, the cooling liquid circularly flows in the stator liquid cooling structure, and the heat at the position of the motor stator is taken away. The cooling fluid here may be cooling water or other commonly used liquid cooling media.
In addition, the end winding of the stator core 3 may be plastic-encapsulated with vacuum-cast epoxy resin 4. As shown in the figure, the epoxy resin 4 can be located between the stator end winding and the motor casing, so that the heat dissipation performance of the stator end winding of the motor is obviously improved while the insulation performance of the stator winding is ensured.
In the figure, a rotor core 6 can be mounted on a rotor rotating shaft 8 through interference fit, and rotor end rings 7a and 7b are positioned on two sides of the rotor core 6. The rotor shaft 8 is supported on the motor housing 1 and the end cover 5 by a first bearing 9a and a second bearing 9b at both ends. O- rings 10a and 10b are respectively arranged outside the first bearing 9a and the second bearing 9 b. The rotor rotating shaft 8 is internally provided with a hollow blind hole 18, and the liquid cooling pipeline 11 is arranged in the hollow blind hole 18, so that the cooling liquid can flow in from the liquid cooling pipeline 11 and flow out from the hollow blind hole 18, and can also flow in from the hollow blind hole 18 and flow out from the liquid cooling pipeline 11, and the cooling of the motor rotor is realized.
Referring to fig. 1, the end of the liquid cooling pipe 11 having the first end opening 11a is suspended in the blind hollow hole 18; and the end having the second end opening 11b is fixed to the motor case 1 or the motor cover. In order to ensure that the cooling liquid of the rotor liquid cooling structure does not enter the interior of the motor, a dynamic seal 12 may be provided at the end of the rotor shaft 8.
Fig. 2 is a motor casing 1 with an integrated stator liquid cooling structure of the power motor in fig. 1. The motor case 1 may have a U-shaped structure formed by integral die casting. It can be understood that the structure of the integrally formed liquid cooling case is simpler and more reliable.
The stator liquid cooling structure of the power motor can be located at the motor shell. The stator liquid cooling structure in the illustrated embodiment has a dual coil liquid cooling circuit. It can be appreciated that the dual spiral liquid cooling loop can be formed inside, outside, or built into the motor integrated housing. For example, in alternative embodiments, the dual spiral liquid cooled structure may be cast directly into the motor casing; or the motor shell can comprise an outer shell and an inner shell which are nested, and the double-helix liquid cooling loop can be formed by matching the outer shell and the inner shell which are nested. Specifically, the outer shell and the inner shell may be installed using a shrink fit and welded at both ends. Preferably, the stator liquid cooling structure may be in fluid communication with the rotor liquid cooling structure; the stator liquid cooling structure and the rotor liquid cooling structure will be described in detail below.
Fig. 3 is a double-helix liquid cooling loop at the motor casing of fig. 2.
As can be seen from the figure, the double-helix liquid-cooling circuit may have two single-helix flow paths in parallel, and the single-helix flow paths have a common liquid inlet 13 and different liquid outlets 14, 15. It can be seen that the cooling liquid in the double-helix liquid cooling loop flows in from the liquid inlet 13, then flows along the two single-helix flow paths respectively in two paths to cool the stator of the motor, and then flows out from the liquid outlet 15 of the first single-helix flow path and the liquid outlet 14 of the second single-helix flow path.
As previously described, the stator liquid cooling structure may be in fluid communication with the rotor liquid cooling structure. In an optional embodiment, the liquid outlet 15 of the double-helix liquid cooling loop of the stator liquid cooling structure can be directly connected with the liquid inlet of the rotor liquid cooling structure to cool the rotor; and the liquid outlet 14 can directly flow out through the motor casing 1. Correspondingly, the liquid discharge port 14 can be directly connected with the liquid inlet of the rotor liquid cooling structure, the rotor is cooled, and the liquid discharge port 15 directly flows out through the motor casing 1.
Fig. 4 is a schematic view of a rotor liquid cooling structure of the power motor in fig. 1.
As can be seen from the figure, the rotor liquid cooling structure comprises a hollow blind hole 18 positioned in the rotor rotating shaft 8, a liquid cooling pipeline 11 is arranged in the hollow blind hole 18, and an annular chamber is formed between the two and is suitable for cooling liquid to flow through. The first end opening 11a of the liquid-cooling pipe 11 protrudes to the blind end of the hollow blind hole 18, and the second end opening 11b of the liquid-cooling pipe 11 protrudes to the open end of the hollow blind hole 18. The hollow blind hole 18 and the liquid cooling pipeline 11 form a liquid cooling flow path of the rotor liquid cooling structure. In addition, the rotor liquid cooling structure further comprises a liquid inlet 16 and a liquid outlet 17 connected to the first end opening 11a of the liquid cooling pipe and the open end of the hollow blind hole 18, respectively.
As previously described, the rotor liquid cooling structure may be in fluid communication with the stator liquid cooling structure. For example, the second end opening 11b of the liquid cooling conduit 11 may be connected to the liquid discharge port 14 or 15 of one of the two single spiral flow paths via the liquid inlet port 16 of the rotor liquid cooling structure. In this case, the cooling liquid may enter the liquid cooling pipeline 11 in the rotor rotating shaft 8 through the liquid inlet 16 of the liquid cooling pipeline 11 in the rotor rotating shaft 8 via the liquid outlet 14 or 15 of the first single spiral flow path on the motor casing 1, then flow out through the annular chamber in the liquid cooling pipeline 11 and the rotor rotating shaft 8, and finally flow out through the liquid outlet 17 of the rotor liquid cooling structure 11. For another example, the open end of the hollow blind hole 18 may be connected to the liquid discharge port 14 or 15 of one of the two single-spiral flow paths via the liquid inlet 16 of the rotor liquid cooling structure. In this case, the cooling liquid may also enter the annular chamber in the rotor rotating shaft 8 through the liquid inlet 16 of the liquid cooling pipeline 11 in the rotor rotating shaft 8 via the liquid outlet 14 or 15 of the first single spiral flow path on the motor casing 1, then flow out through the annular chamber and the liquid cooling pipeline 11, and finally flow out through the liquid outlet 17 of the rotor liquid cooling structure. It can be appreciated that the above-mentioned two different connection modes can realize different coolant flow directions in the rotor liquid cooling structure.
From the above description, those skilled in the art can obtain a power motor and an electric drive system including the motor cooling structure as described above. It is conceivable that such a motor and electric drive system may be used to drive a new energy vehicle such as a new energy automobile.
The technical personnel in the field can understand that the stator of the motor is cooled and radiated by adopting a liquid cooling mode of the motor shell with a double-spiral structure, epoxy resin is poured at the end winding of the stator for plastic package, and the radiation of the end winding of the stator is further improved, so that the heat on the stator of the motor is well diffused, and the method has important significance for improving the service life of an insulating material of the motor; meanwhile, in order to carry out overall design analysis and avoid the over-temperature of the motor rotor or the over-temperature of the bearing, the invention adopts the rotor liquid cooling structure, cooperates with the electromagnetic and thermal design of the motor, avoids local weak links, is beneficial to improving the power and torque density, the service life and the reliability of the motor, and has very important significance.
The technical scope of the present invention is not limited to the above description, and those skilled in the art can make various changes and modifications to the above-described embodiments without departing from the technical spirit of the present invention, and such changes and modifications should fall within the scope of the present invention.
Claims (7)
1. A motor cooling structure is characterized in that the motor cooling structure comprises a rotor liquid cooling structure, the rotor liquid cooling structure comprises a hollow blind hole positioned in a rotor rotating shaft, a liquid cooling pipeline is arranged in the hollow blind hole, a first end opening of the liquid cooling pipeline extends out of the blind end of the hollow blind hole, the second end opening of the liquid cooling pipeline extends to the opening end of the hollow blind hole, the hollow blind hole and the liquid cooling pipeline form a liquid cooling flow path of the rotor liquid cooling structure, wherein the motor cooling structure also comprises a stator liquid cooling structure, the stator liquid cooling structure comprises a double-helix liquid cooling loop at the motor shell, wherein the double-helix liquid cooling loop is provided with two single-helix flow paths which are connected in parallel, and the single-helix flow paths are provided with a common liquid inlet and different liquid outlets, the stator liquid cooling structure and the rotor liquid cooling structure are in fluid communication through the following two modes:
i, a second end opening of the liquid cooling pipeline is connected to a liquid outlet of one of the two single spiral flow paths through a liquid inlet of the rotor liquid cooling structure, and the other liquid outlet directly flows outwards through the motor shell, so that cooling liquid enters the liquid cooling pipeline in the rotor rotating shaft through the liquid outlet of one of the two single spiral flow paths through the liquid inlet of the liquid cooling pipeline in the rotor rotating shaft, then flows out through the liquid cooling pipeline and an annular cavity in the rotor rotating shaft, and finally flows out through a liquid outlet of the rotor liquid cooling structure; or
ii, the opening end of the hollow blind hole is connected to the liquid outlet of one of the two single spiral flow paths through the liquid inlet of the rotor liquid cooling structure, and the other liquid outlet directly flows out through the motor shell, so that the cooling liquid enters the annular chamber in the rotor rotating shaft through the liquid inlet of the liquid cooling pipeline in the rotor rotating shaft through the liquid outlet of one of the two single spiral flow paths, then flows out through the annular chamber and the liquid cooling pipeline, and finally flows out through the liquid outlet of the rotor liquid cooling structure.
2. The motor cooling structure of claim 1, wherein the end of the liquid cooling conduit having the second end opening is fixed to a motor housing or a motor end cap.
3. The motor cooling structure of claim 1, wherein the dual spiral liquid cooling circuit is integrally die cast into the motor housing.
4. The electric machine cooling structure of claim 3, wherein the electric machine housing comprises nested outer and inner housings, the dual spiral liquid cooling circuit formed by the mating of the nested outer and inner housings.
5. The motor cooling structure according to any one of claims 1 to 4, wherein the motor cooling structure further comprises an epoxy resin that is overmolded at a stator end winding of the motor, the epoxy resin being located between the stator end winding and a motor casing.
6. A power motor, characterized in that it comprises a motor cooling structure according to any one of the preceding claims 1 to 5.
7. An electric drive system, characterized in that the electric drive system comprises an electric machine according to claim 6.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710095454.5A CN108462318B (en) | 2017-02-22 | 2017-02-22 | Motor cooling structure, power motor and electric drive system |
| PCT/CN2017/091584 WO2018153001A1 (en) | 2017-02-22 | 2017-07-04 | Motor cooling structure, power motor and electric drive system |
| TW107101656A TWI782944B (en) | 2017-02-22 | 2018-01-17 | Motor cooling structure, power motor and electric drive system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710095454.5A CN108462318B (en) | 2017-02-22 | 2017-02-22 | Motor cooling structure, power motor and electric drive system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108462318A CN108462318A (en) | 2018-08-28 |
| CN108462318B true CN108462318B (en) | 2022-04-26 |
Family
ID=63229200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710095454.5A Active CN108462318B (en) | 2017-02-22 | 2017-02-22 | Motor cooling structure, power motor and electric drive system |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN108462318B (en) |
| TW (1) | TWI782944B (en) |
| WO (1) | WO2018153001A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018222625A1 (en) * | 2018-09-18 | 2020-03-19 | Ziehl-Abegg Automotive Gmbh & Co. Kg | Heatsink for an electric motor, electric motor and method for cooling the motor |
| DE102018218818A1 (en) * | 2018-11-05 | 2020-05-07 | Zf Friedrichshafen Ag | Electrical machine with a fluid cooling device |
| DE102018218815A1 (en) * | 2018-11-05 | 2020-05-07 | Zf Friedrichshafen Ag | Electrical machine with a fluid cooling device |
| CN109309430A (en) * | 2018-11-21 | 2019-02-05 | 中国科学院电工研究所 | A kind of motor cooling of spindle central water cooling |
| CN109586511B (en) * | 2018-12-31 | 2024-03-19 | 卧龙电气驱动集团股份有限公司 | Liquid cooling permanent magnet motor with controller cooling function |
| CN109742886B (en) * | 2019-01-04 | 2020-07-14 | 锦州汉拿电机有限公司 | Stator assembly and driving motor |
| CN110266127B (en) | 2019-06-04 | 2021-10-15 | 华为技术有限公司 | Motor, motor cooling system and electric vehicle |
| CN112520000A (en) * | 2019-09-17 | 2021-03-19 | 西门子（中国）有限公司 | Pod type propeller and ship |
| CN110733334B (en) * | 2019-10-29 | 2022-07-12 | 宁波菲仕运动控制技术有限公司 | Motor rotor cooling system of electric drive assembly |
| JP7308773B2 (en) * | 2020-01-23 | 2023-07-14 | エドワーズ株式会社 | Rotating device and vacuum pump |
| CN113572289B (en) * | 2021-07-05 | 2022-05-31 | 合肥巨一动力系统有限公司 | Oil-cooling hollow rotating shaft structure |
| CN113890249B (en) * | 2021-09-28 | 2023-01-20 | 上海汽车变速器有限公司 | Motor assembly and motor cooling system |
| CN114567126B (en) * | 2022-03-07 | 2023-04-07 | 杭州桢正玮顿运动控制技术有限公司 | Oil-cooled permanent magnet synchronous motor |
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2018
- 2018-01-17 TW TW107101656A patent/TWI782944B/en active
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Also Published As
| Publication number | Publication date |
|---|---|
| TW201832452A (en) | 2018-09-01 |
| TWI782944B (en) | 2022-11-11 |
| CN108462318A (en) | 2018-08-28 |
| WO2018153001A1 (en) | 2018-08-30 |
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