CN111884379A - Through-flow air cooling rotor and high-speed motor - Google Patents
Through-flow air cooling rotor and high-speed motor Download PDFInfo
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- CN111884379A CN111884379A CN202010755542.5A CN202010755542A CN111884379A CN 111884379 A CN111884379 A CN 111884379A CN 202010755542 A CN202010755542 A CN 202010755542A CN 111884379 A CN111884379 A CN 111884379A
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- hollow shaft
- rotor
- cooling
- air
- permanent magnet
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- 238000001816 cooling Methods 0.000 title claims abstract description 62
- 230000000694 effects Effects 0.000 abstract description 14
- 238000009423 ventilation Methods 0.000 abstract 1
- 230000017525 heat dissipation Effects 0.000 description 13
- 239000000112 cooling gas Substances 0.000 description 11
- 239000007789 gas Substances 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 230000002596 correlated effect Effects 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating 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
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention relates to a through-flow air-cooled rotor and a high-speed motor, wherein the high-speed motor comprises a shell, a hollow shaft, a permanent magnet rotor and a stator, the hollow shaft is hollow, two ends of the hollow shaft are respectively supported and arranged in the shell through bearings, one end of the hollow shaft is opened, the other end of the hollow shaft is fixedly connected with an output shaft of the high-speed motor, the permanent magnet rotor is sleeved on the hollow shaft and is installed coaxially with the stator fixed on the inner side of the shell, a plurality of cooling air centrifugal tubes which are communicated in the radial direction are further arranged on the permanent magnet rotor, and a gap is reserved between the permanent magnet rotor and. Compared with the prior art, the cooling system solves the problems of poor cooling effect and uneven cooling of the air cooling system of the high-speed motor, and can adopt the open-circuit mixed ventilation cooling system to cool the high-speed motor.
Description
Technical Field
The invention belongs to the technical field of high-speed motors, and relates to a through-flow air-cooled rotor and a high-speed motor.
Background
In recent times, the application of motors has been very extensive, and most of them use higher electromagnetic load to improve the utilization rate of materials. When the motor runs at a high speed, a lot of heat is generated, and the generated heat, if not cooled, will reduce the magnetism of the fixed magnet, and is more likely to further reduce the electromagnetism of the fixed coil, reduce the performance of the motor or lose the performance. To cope with these problems, cooling methods such as water cooling, oil cooling, and hydrogen cooling are available, but none of them is widely applicable at low cost.
For example, chinese patent CN209402316U discloses a motor with a cooling system, which comprises a housing, a rotor and a stator disposed in the housing; the rotor comprises a rotor shaft, a rotor shaft axial hole for air circulation is formed in the rotor shaft, and a rotor shaft radial hole communicated with the rotor shaft axial hole is formed in the outer side wall of the rotor shaft; the rotor shaft radial hole and the rotor shaft axial hole form a rotor cooling flow passage; a stator cooling flow passage is arranged between the shell and the stator. The motor can cool the inside of the rotor through the axial hole of the rotor and the radial hole of the rotor shaft, can cool the stator through the cooling flow channel of the stator, does not need extra medium, can cool the rotor and the stator simultaneously through air, improves the heat-resisting grade of the motor, and ensures that the motor can stably run for a long time. Although the device has a certain cooling effect, the cooling efficiency and the energy consumption of the device are still improved, and the device has no self-adaptability.
Disclosure of Invention
The invention aims to provide a high-speed motor with through-flow air cooling of a rotor, which aims to solve the problems of poor cooling effect and uneven cooling of an air cooling system of the high-speed motor.
The purpose of the invention can be realized by the following technical scheme:
one of the technical schemes of the invention provides a through-flow air-cooled rotor which is characterized by comprising a hollow shaft with a hollow interior and a permanent magnet rotor sleeved on the hollow shaft, wherein one end of the hollow shaft is provided with an opening, the other end of the hollow shaft is fixedly connected with an output shaft of a high-speed motor, and the permanent magnet rotor is also provided with a plurality of cooling centrifugal tubes communicated with a cavity in the hollow shaft.
Furthermore, the cooling air centrifugal tubes are arranged in a staggered mode along the axial direction of the hollow shaft. Preferably in a staggered parallel arrangement.
Furthermore, an air compressor turbine is arranged at the opening position of the hollow shaft, and when the air compressor turbine rotates along with the hollow shaft, the air compressor turbine presses external air into the hollow shaft.
Furthermore, the opening of the hollow shaft is processed into a cone shape to form a conical air inlet, and the blade tip of the compressor turbine is welded and fixed with the edge of the conical air inlet.
Furthermore, the hollow shaft and the output shaft are coaxially arranged.
Furthermore, the permanent magnet rotor comprises a plurality of groups of magnetic blocks which are sequentially arranged at intervals along the axial direction of the hollow shaft, and the cooling centrifugal tube is arranged between every two adjacent groups of magnetic blocks. The wall surface of the cooling centrifugal tube is contacted with the magnetic block.
Furthermore, among the multiple groups of magnetic blocks, the length of the last group of magnetic blocks in the flowing direction of cooling air is half of the length of the rest groups of magnetic blocks, so that the design is favorable for improving the heat dissipation efficiency of the magnetic blocks, and local overheating caused by the fact that no cooling centrifugal tube is arranged at the bottom of the last magnetic block is avoided. A cooling gas centrifuge tube is responsible for heat dissipation of the upper and lower half magnetic blocks, so that the length of the last magnetic block is only half of the rest length.
The second technical scheme of the invention provides a high-speed motor with through-flow air cooling of a rotor, which comprises a shell, a stator fixed in the shell and the rotor, wherein two ends of a hollow shaft are respectively supported in the shell through bearings, the permanent magnet rotor and the stator are coaxially arranged, and a gap is reserved between the permanent magnet rotor and the stator.
Further, the front end of the shell is provided with an air inlet port which is just opposite to the opening at the end part of the hollow shaft, an air filter screen is further arranged at the air inlet port, and the tail end of the shell is further provided with an exhaust hole.
Furthermore, the width of a gap between the permanent magnet rotor and the stator is 0.3-1 mm.
Furthermore, the inner diameter of the cooling air centrifugal pipe is 1-4 mm.
The invention utilizes the principle of centrifugal force to drive the air to flow in the radial and outward directions, so that the cooling efficiency is greatly improved, the energy-saving effect is better, and meanwhile, at low rotating speed, the cooling air can be circulated due to the boosting of the air compressor turbine on the shaft, and the invention can also achieve the ideal cooling effect. When the heat dissipation device is used specifically, the faster the rotating speed of the motor is, the higher the generated heat is, and the faster the rotating speed is, the faster the gas flow speed is, the heat dissipation effect is correspondingly enhanced, and the heat dissipation device has certain self-adaptability.
The invention solves the problem of heat dissipation of the motor by using an air medium, and solves the problems of reduced magnetism of the fixed magnet, reduced electromagnetism of the fixed coil, reduced performance or lost performance of the motor and the like caused by poor heat dissipation effect. The invention mainly utilizes the centrifugal force of the hollow shaft and the high-speed motor to ensure that air can pass through the cooling air centrifugal tube of the permanent magnet rotor and the gap between the rotor and the stator, thereby fully and uniformly cooling the motor. The permanent magnet DC high-speed motor or the squirrel-cage AC induction motor can be used at the level of more than tens of thousands of revolutions per minute. The flow rate of the gas is positively correlated with the number of revolutions of the motor, i.e. the more heat is generated, the greater the heat dissipation will be. The motor is slender and has a reduced diameter so as to reduce the rotational inertia of the rotor.
Drawings
FIG. 1 is a schematic structural view of the present invention;
the notation in the figure is:
1-air filter screen, 2-air compressor turbine, 3-conical air inlet, 4-front bearing, 5-hollow shaft, 6-cooling air centrifuge tube, 7-permanent magnet rotor, 8-stator, 9-exhaust hole, 10-rear bearing and 11-output shaft.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In the following embodiments or examples, functional components or structures that are not specifically described are all conventional components or structures in the art for achieving the corresponding functions.
One of the technical schemes of the invention provides a through-flow air-cooled rotor, which comprises a hollow shaft 5 with a hollow interior and a permanent magnet rotor 7 sleeved on the hollow shaft 5, wherein one end of the hollow shaft 5 is provided with an opening, the other end of the hollow shaft 5 is fixedly connected with an output shaft 11 of a high-speed motor, and the permanent magnet rotor 7 is also provided with a plurality of cooling centrifugal tubes communicated with a cavity in the hollow shaft 5.
In one specific embodiment of the invention, the cooling gas centrifuge tubes 6 are arranged axially staggered along the hollow shaft 5. Preferably in a staggered parallel arrangement. The centrifugal force caused by autorotation can be fully utilized to drive cooling air to flow, so that the cooling effect is achieved; the heat dissipation effect is more even, avoids local overheat.
In an embodiment of the present invention, the open position of the hollow shaft 5 is further provided with a compressor 2, and when the compressor 2 rotates with the hollow shaft 5, it simultaneously presses the outside air into the hollow shaft 5.
In a more specific embodiment, the opening of the hollow shaft 5 is tapered to form the tapered inlet 3, and the blade tips of the compressor turbine 2 are welded and fixed to the edge of the tapered inlet 3.
In a particular embodiment of the invention, the hollow shaft 5 is arranged coaxially with the output shaft 11.
In a specific embodiment of the present invention, the permanent magnet rotor 7 is composed of a plurality of groups of magnetic blocks sequentially arranged along the axial direction of the hollow shaft 5 at intervals, and the cooling centrifuge tube is arranged between two adjacent groups of magnetic blocks.
In a more specific embodiment, among the plurality of groups of magnetic blocks, the length of the last group of magnetic blocks located along the flowing direction of cooling air is half of the length of the rest groups of magnetic blocks, so that the design is favorable for improving the heat dissipation efficiency of the magnetic blocks, and local overheating caused by the fact that no cooling centrifugal tube is arranged at the bottom of the last magnetic block is avoided. A cooling gas centrifuge tube is responsible for heat dissipation of the upper and lower half magnetic blocks, so that the length of the last magnetic block is only half of the rest length.
In a specific embodiment of the invention, the inner diameter of the cooling gas centrifugal tube 6 is 1-4 mm.
The second technical scheme of the invention provides a high-speed motor with through-flow air cooling of a rotor, which comprises a shell, a stator 8 fixed in the shell and the rotor, wherein two ends of a hollow shaft 5 are respectively supported and arranged in the shell through bearings, the permanent magnet rotor 7 and the stator 8 are installed coaxially, and a gap is reserved between the permanent magnet rotor 7 and the stator 8.
In a specific embodiment of the present invention, the front end of the housing is provided with an air inlet port facing the opening of the end of the hollow shaft 5, and an air filter 1 is further disposed at the air inlet port. In a specific embodiment of the invention, the tail end of the shell is also provided with an exhaust hole 9. In a more specific embodiment, the stator 88 is also provided with radial exhaust through holes to increase the air flow and further improve the cooling efficiency.
In a more specific embodiment, the width of the gap between the permanent magnet rotor 7 and the stator 8 is 0.3-1 mm.
The above embodiments may be implemented individually, or in any combination of two or more.
The above embodiments will be described in more detail with reference to specific examples.
Example 1:
referring to fig. 1, the embodiment provides a through-flow air cooled rotor, which includes an internal hollow shaft 5 and a permanent magnet rotor 7 sleeved on the hollow shaft 5, wherein one end of the hollow shaft 5 is open, the other end of the hollow shaft is fixedly connected with an output shaft 11 of a high-speed motor, and the permanent magnet rotor 7 is further provided with a plurality of cooling centrifuge tubes communicated with an internal cavity of the hollow shaft 5.
In this embodiment, the cooling gas centrifuge tubes 6 are arranged in a staggered manner along the axial direction of the hollow shaft 5. Preferably in a staggered parallel arrangement. The centrifugal force caused by autorotation can be fully utilized to drive cooling air to flow, so that the cooling effect is achieved; the heat dissipation effect is more even, avoids local overheat. The opening position of the hollow shaft 5 is also provided with an air compressor 2, and when the air compressor 2 rotates along with the hollow shaft 5, the air compressor presses outside air into the hollow shaft 5. The opening of the hollow shaft 5 is processed into a cone shape to form a cone-shaped air inlet 3, and the blade tip of the compressor turbine 2 is welded and fixed with the edge of the cone-shaped air inlet 3. The hollow shaft 5 and the output shaft 11 are coaxially arranged. The permanent magnet rotor 7 consists of a plurality of groups of magnetic blocks which are sequentially arranged along the axial direction of the hollow shaft 5 at intervals, and the cooling centrifugal tube is arranged between every two adjacent groups of magnetic blocks. Among the multiunit magnetic path, the length that is located the last magnetic path along cooling air flow direction is half of each all other magnetic path length of group, and the design is favorable to improving the radiating efficiency of magnetic path like this, avoids because of last magnetic path bottom does not have the cooling centrifuging tube, and leads to local overheat. A cooling gas centrifuge tube is responsible for heat dissipation of the upper and lower half magnetic blocks, so that the length of the last magnetic block is only half of the rest length. The inner diameter of the cooling gas centrifugal tube 6 is 1-4 mm.
Example 2:
as shown in fig. 1, the embodiment provides a rotor through-flow air-cooled high-speed motor, which comprises a housing, a hollow shaft 5, a permanent magnet rotor and a stator 8, the hollow shaft 5 is hollow inside, two ends of the hollow shaft are respectively supported and arranged in the housing through bearings (namely respectively corresponding to a front bearing 4 and a rear bearing 10 at the front end and the rear end), one end of the hollow shaft 5 is open, the other end of the hollow shaft is fixedly connected with an output shaft 11 of the high-speed motor, the permanent magnet rotor is sleeved on the hollow shaft 5 and is installed with the same axial lead as the stator 8 fixed on the inner side of the housing, a plurality of cooling gas centrifugal tubes 6 which are radially communicated are further arranged on the permanent magnet rotor.
In this embodiment, cooling gas centrifuging tube 6 is along hollow shaft 5 axial staggered arrangement, and the front end of shell is equipped with just to the air inlet opening of hollow shaft 5 tip open-ended, still is provided with air cleaner screen 1 in air inlet opening department. The open position of the hollow shaft 5 is also provided with a compressor wheel 2, and when the compressor wheel 2 rotates with the hollow shaft 5, the compressor wheel presses the outside air into the hollow shaft 5. The opening of the hollow shaft 5 is processed into a cone to form a conical air inlet 3, and the blade tip of the gas turbine 2 is welded and fixed with the edge of the conical air inlet 3. The hollow shaft 5 is arranged coaxially with the output shaft 11. The tail end of the shell is also provided with an exhaust hole 9.
In the embodiment, the inner diameter of the cooling gas centrifugal tube 6 is 1-4 mm, and the gap between the permanent magnet rotor 7 and the stator 8 is 0.3-1 mm.
The specific working process of the device of the embodiment is as follows:
the high-speed motor is slender and has a reduced diameter so as to reduce the rotational inertia of the rotor. When high-speed motor rotated, the inside of outside air inflow motor under compressor turbine 2's effect, at first through air strainer 1, filter most solid particulate matter, then get into toper air inlet 3 through compressor turbine 2, let in inside hollow shaft 5, under the effect of centrifugal force, the cooling air in hollow shaft 5 passes through cooling gas centrifuging tube 6 high-speed discharge of staggered arrangement between permanent magnet rotor 7, and to the clearance between permanent magnet rotor 7 and the stator 8, discharge from the exhaust hole 9 of motor tail end at last, play the effect of forced cooling. If necessary, the air flow can be increased by opening the air outlet holes 9 between the windings of the stator 8, and the cooling efficiency is improved. The permanent magnet DC high-speed motor or the squirrel-cage AC induction motor can be used at the level of more than tens of thousands of revolutions per minute. The flow rate of the gas is positively correlated with the number of revolutions of the motor.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The utility model provides a through-flow air cooling's rotor, its characterized in that includes inside hollow shaft to and the cover establishes the permanent magnet rotor on the hollow shaft, the one end opening of hollow shaft, other end fixed connection high speed motor's output shaft, the permanent magnet rotor on still be equipped with the switch-on a plurality of cooling centrifuging tubes of the inside cavity of hollow shaft.
2. A through-flow air cooled rotor as recited in claim 1 wherein said cooling air centrifuge tubes are staggered axially along the hollow shaft.
3. A through-flow air cooled rotor as recited in claim 1 wherein the open position of the hollow shaft is further provided with a compressor wheel which simultaneously forces outside air into the hollow shaft as the compressor wheel rotates with the hollow shaft.
4. A through-flow air cooled rotor as claimed in claim 3 wherein the opening of said hollow shaft is tapered to form a tapered inlet, and the tips of the compressor blades are welded to the edges of the tapered inlet.
5. A through-flow air cooled rotor as recited in claim 1 wherein said hollow shaft is disposed coaxially with the output shaft.
6. A cross-flow air cooled rotor as claimed in claim 1 wherein said permanent magnet rotor is comprised of multiple sets of magnets sequentially spaced axially along the hollow shaft, and said cooling centrifuge tube is disposed between two adjacent sets of magnets.
7. A cross-flow air cooled rotor as recited in claim 6 wherein the last set of magnets in the plurality of sets of magnets in the direction of cooling air flow is half the length of the remaining sets of magnets.
8. A high-speed motor with through-flow air cooling of rotor is composed of casing, stator fixed in the casing, and rotor according to any one of claims 1-7, and features that two ends of hollow shaft are supported by bearings in casing, the permanent-magnet rotor and stator are installed coaxially, and a gap is left between them.
9. A high speed electric machine with through-flow air cooling of the rotor according to claim 8, characterized in that the front end of the housing is provided with an air inlet opening facing the end opening of the hollow shaft, an air screen is further provided at the air inlet opening, and the rear end of the housing is further provided with an air outlet hole.
10. The high-speed motor with through-flow air cooling of rotor as recited in claim 8, wherein the width of the gap between the permanent magnet rotor and the stator is 0.3-1 mm; the inner diameter of the cooling air centrifugal pipe is 1-4 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010755542.5A CN111884379A (en) | 2020-07-31 | 2020-07-31 | Through-flow air cooling rotor and high-speed motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010755542.5A CN111884379A (en) | 2020-07-31 | 2020-07-31 | Through-flow air cooling rotor and high-speed motor |
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| Publication Number | Publication Date |
|---|---|
| CN111884379A true CN111884379A (en) | 2020-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010755542.5A Pending CN111884379A (en) | 2020-07-31 | 2020-07-31 | Through-flow air cooling rotor and high-speed motor |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023217A (en) * | 2012-12-18 | 2013-04-03 | 上海电机学院 | Overall machine wind path structure of high-power and high-peed permanent magnet synchronous motor |
| CN103490541A (en) * | 2013-09-27 | 2014-01-01 | 南京磁谷科技有限公司 | High-speed motor self-cooling rotor |
| CN106340981A (en) * | 2016-09-20 | 2017-01-18 | 北京交通大学 | Cooling device for reducing temperature of permanent magnet in permanent magnet motor |
| CN206041683U (en) * | 2016-08-31 | 2017-03-22 | 温州仕博电器科技有限公司 | Axle electric motor rotor ventilates |
| CN109274188A (en) * | 2018-10-29 | 2019-01-25 | 西安交通大学 | One kind being used for the self cooled composite rotors structure of high-speed permanent magnet motor |
| CN110474485A (en) * | 2019-07-17 | 2019-11-19 | 南京师范大学 | A kind of high-speed motor cooling system |
-
2020
- 2020-07-31 CN CN202010755542.5A patent/CN111884379A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023217A (en) * | 2012-12-18 | 2013-04-03 | 上海电机学院 | Overall machine wind path structure of high-power and high-peed permanent magnet synchronous motor |
| CN103490541A (en) * | 2013-09-27 | 2014-01-01 | 南京磁谷科技有限公司 | High-speed motor self-cooling rotor |
| CN206041683U (en) * | 2016-08-31 | 2017-03-22 | 温州仕博电器科技有限公司 | Axle electric motor rotor ventilates |
| CN106340981A (en) * | 2016-09-20 | 2017-01-18 | 北京交通大学 | Cooling device for reducing temperature of permanent magnet in permanent magnet motor |
| CN109274188A (en) * | 2018-10-29 | 2019-01-25 | 西安交通大学 | One kind being used for the self cooled composite rotors structure of high-speed permanent magnet motor |
| CN110474485A (en) * | 2019-07-17 | 2019-11-19 | 南京师范大学 | A kind of high-speed motor cooling system |
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Application publication date: 20201103 |
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