CN113036968A - Rotor internal oil circuit cooling structure - Google Patents
Rotor internal oil circuit cooling structure Download PDFInfo
- Publication number
- CN113036968A CN113036968A CN202110280145.1A CN202110280145A CN113036968A CN 113036968 A CN113036968 A CN 113036968A CN 202110280145 A CN202110280145 A CN 202110280145A CN 113036968 A CN113036968 A CN 113036968A
- Authority
- CN
- China
- Prior art keywords
- rotor
- rotor yoke
- rotating shaft
- flow channel
- permanent magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/278—Surface mounted magnets; Inset magnets
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention relates to the field of motor cooling, in particular to a rotor internal oil circuit cooling structure which comprises a shell arranged outside a motor, wherein end covers are arranged at two ends of the shell, a hollow rotating shaft is arranged between the end covers, a rotor yoke part is arranged at the outer side end of the hollow rotating shaft, a rotor yoke part radial flow passage and a rotor yoke part axial flow passage are arranged in the rotor yoke part, a bearing chamber is arranged at one side of the hollow rotating shaft, and an oil inlet is arranged on the outer wall of the bearing chamber. The cooling oil enters the bearing chamber and the hollow rotating shaft through the external oil pump, the centrifugal force generated by the rotation of the rotor enables the cooling oil in the hollow rotating shaft to flow along the radial flow channel of the rotor yoke part and then flow along two directions of the axial flow channel of the rotor yoke part respectively, and the cooling oil is thrown out from two ports of the axial flow channel of the rotor yoke part. The cooling structure provided by the invention can solve the problem of difficult heat dissipation of the permanent magnet motor rotor, and meanwhile, the rotor quality is obviously reduced due to the hollow structure of the rotating shaft and the rotor flow channel, so that the power density of the motor can be further improved.
Description
Technical Field
The invention relates to the field of motor cooling, in particular to a cooling structure for an oil circuit in a rotor.
Background
The permanent magnet motor is widely applied to different industrial fields due to high power density, high efficiency and excellent control performance, and along with the improvement of the performance requirements of the industrial application field on the motor, the design of the permanent magnet motor usually presents the characteristics of high running speed, high power density and high electromagnetic load, so that the difficulty of the design of the permanent magnet motor is undoubtedly improved. However, high performance permanent magnets such as neodymium iron boron have high temperature sensitivity, and the performance of the permanent magnet decreases with increasing rotor temperature, and even irreversible demagnetization occurs in severe cases. Therefore, in the design of permanent magnet motors, especially high performance permanent magnet motors, a reasonable rotor cooling method is the guarantee of safe and reliable operation of the motor.
At present, the rotor cooling usually adopts air cooling and oil cooling modes, an axial flow fan or an external blowing device positioned on one side of a rotating shaft provides cooling air volume according to requirements, and the cooling air blows the surface of the rotor to reduce the temperature of the rotor. However, in the high-speed operation state, the air cooling will obviously increase the wind friction loss of the motor, and at the same time, the serious wind noise will be generated. The rotor oil cooling mode adopts the cavity pivot more, or the multilayer cavity pivot structure that tesla motor used, and the coolant oil flows in through pivot one end, flows out by the pivot other end or the inside one deck cavity of pivot. However, the cooling effect of this method is limited because the path through which the heat of the rotor sheath, the permanent magnets, and the rotor yoke portion is transferred to the rotating shaft is long. In addition, there is a document that the motor is designed as a sealing structure, and a rotor part is wholly or partially immersed in cooling oil, so that the cooling oil directly contacts a heat source to take away heat, but the viscosity of the cooling oil is high, so that the friction loss of the rotor is increased sharply, and when the method is adopted in a high-speed permanent magnet motor, the friction loss of the rotor even exceeds the eddy current loss of the rotor.
Disclosure of Invention
In order to solve the above-mentioned drawbacks in the background art, an object of the present invention is to provide a cooling structure for an oil passage inside a rotor.
The purpose of the invention can be realized by the following technical scheme:
a cooling structure of an oil circuit in a rotor comprises a machine shell arranged outside a motor, wherein end covers are arranged at two ends of the machine shell, a bearing used for supporting a hollow rotating shaft is arranged between the end covers, a rotor yoke portion is arranged at the outer side end of the hollow rotating shaft, a rotor yoke portion radial flow channel and a rotor yoke portion axial flow channel are arranged in the rotor yoke portion, and the rotor yoke portion radial flow channel and the rotor yoke portion axial flow channel respectively penetrate through the radial whole body and the axial whole body of the rotor yoke portion;
one side of the hollow rotating shaft is provided with a hole, one side of the hole is provided with a bearing chamber, the outer wall of the bearing chamber is provided with an oil inlet, and an oil outlet corresponding to the oil inlet is arranged at the bottom of the shell.
Further, the water channel type of the machine shell adopts one of a spiral water channel or an axial water channel.
Furthermore, the radial flow channels of the rotor yoke are symmetrical with the circle center of the hollow rotating shaft, and the ports of the two ends of the radial flow channels of the rotor yoke are blocked by bolts.
Furthermore, the number of the axial flow channels of the rotor yoke part is the same as that of the radial flow channels of the rotor yoke part, and the axial flow channels and the radial flow channels of the rotor yoke part correspond to each other one by one.
Furthermore, a permanent magnet is arranged on the rotor yoke part, when the permanent magnet adopts a Halbach array, the permanent magnet forms a complete magnetic circuit, and the position of an axial flow channel of the rotor yoke part is close to the permanent magnet;
when the permanent magnet adopts other magnetizing modes, the permanent magnet needs to form a magnetic circuit by means of the yoke part of the magnetic conduction rotor, and the position of the axial flow channel of the yoke part of the rotor is far away from the permanent magnet.
The invention has the beneficial effects that:
1. according to the rotor internal oil circuit cooling structure, the cooling medium can be conveyed to the inside of the hollow rotating shaft through the hollow rotating shaft, the bearing chamber and the external oil pump, the rotor yoke axial flow channel and the rotor yoke radial flow channel structure are adopted to form a complete rotor flow channel, during the operation of a motor, the cooling oil in the rotating shaft flows into the rotor yoke radial flow channel under the action of centrifugal force, then enters the rotor yoke axial flow channel and is thrown out from two ports of the rotor yoke axial flow channel, and the cooling oil is very close to a heat source, so that the cooling effect is better;
2. the rotor yoke is processed on the basis of a complete rotor yoke, the structure is simple and easy to realize, a complex external structure is not needed for forming a complete oil circuit, the good integrity of the rotor is ensured, meanwhile, when the rotor yoke is used, cooling oil is not in contact with the outer surface of the rotor, obvious friction loss cannot be caused, and efficient operation is ensured;
3. in the rotor internal oil circuit cooling structure adopted by the invention, the existence of the hollow rotating shaft, the rotor yoke axial flow channel and the rotor yoke radial flow channel greatly reduces the rotor quality, and further improves the power density of the motor.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without creative efforts;
FIG. 1 is a schematic view of the internal oil path cooling structure of the rotor of the present invention;
FIG. 2 is an axial schematic view of the internal oil path cooling structure of the rotor of the present invention;
the reference signs are: the method comprises the following steps of 1-a machine shell, 2-end covers, 3-end windings, 4-permanent magnets, 5-a rotor yoke, 6-a hollow rotating shaft, 7-a rotor yoke radial flow channel, 8-an oil outlet, 9-a bolt, 10-a rotor yoke axial flow channel, 11-an oil inlet, 12-a bearing chamber, 13-a sheath and 14-a stator core.
Detailed Description
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.
As shown in fig. 1, the motor according to the embodiment of the present invention includes a casing 1, an end cover 2, an end winding 3, a rotor, a hollow rotating shaft 6, and a stator core 14, where the end cover 2 is installed outside the casing 1, a permanent magnet 4 is disposed on a yoke portion 5 of the rotor, a sheath 13 is disposed between the stator core 14 and the permanent magnet 4, the casing 1 has a water channel type of one of a spiral water channel and an axial water channel, and the rotor has a surface-mount structure or an embedded type.
As shown in fig. 1 and 2, an internal oil path cooling structure of a rotor includes a casing 1 disposed outside a motor, end caps 2 are disposed at two ends of the casing 1, a bearing for supporting a hollow rotating shaft 6 is disposed between the end caps 2, a rotor yoke 5 is disposed at an outer end of the hollow rotating shaft 6, a radial rotor yoke flow passage 7 and an axial rotor yoke flow passage 10 are disposed inside the rotor yoke 5, the radial rotor yoke flow passage 7 and the axial rotor yoke flow passage 10 respectively penetrate through the radial whole body and the axial whole body of the rotor yoke 5, the radial rotor yoke flow passage 7 is symmetrical with a center of the hollow rotating shaft 6, and two end ports of the radial rotor yoke flow passage 7 are blocked by bolts 9, so that cooling oil is ensured to flow into the axial rotor yoke flow.
The number of the rotor yoke axial flow channels 10 is the same as that of the rotor yoke radial flow channels 7, and the rotor yoke axial flow channels and the rotor yoke radial flow channels correspond to each other one by one, and the specific number can be determined according to actual requirements, but reasonable rotor strength must be ensured and accurate rotor dynamics analysis must be carried out.
One side of the hollow rotating shaft 6 is provided with a hole, one side of the hole is provided with a bearing chamber 12, the outer wall of the bearing chamber 12 is provided with an oil inlet 11, and an oil outlet 8 corresponding to the oil inlet 11 is arranged at the bottom of the machine shell 1. The cooling oil enters a bearing chamber 12 and a middle idle shaft 6 through an oil inlet 11 through an external oil pump, the cooling oil inside the hollow rotating shaft 6 flows along a radial runner 7 of a rotor yoke part by the centrifugal force generated by the rotation of the rotor, then flows along two directions of axial runners 10 of the rotor yoke part respectively, the cooling oil is thrown out from two ports of the axial runners 10 of the rotor yoke part, and the dropped cooling oil is gathered at the bottom of the machine shell 1 and is discharged outwards through an oil outlet 8.
The position of the rotor yoke axial flow channel 10 needs to be correspondingly adjusted according to the magnetization of the permanent magnet 4, when a Halbach array is adopted, the permanent magnet 4 can form a complete magnetic circuit, and the position of the rotor yoke axial flow channel 10 can be further close to the permanent magnet 4; when other magnetizing modes are adopted, a magnetic path needs to be formed by the magnetic conduction rotor yoke part 5, and the position of the axial flow channel 10 of the rotor yoke part is far away from the permanent magnet 4.
According to the rotor internal oil circuit cooling structure, the cooling medium can be conveyed to the inside of the hollow rotating shaft 6 through the hollow rotating shaft 6, the bearing chamber 12 and the external oil pump, the rotor yoke axial flow channel 10 and the rotor yoke radial flow channel 7 are adopted to form a complete rotor flow channel, during the operation of a motor, cooling oil in the rotating shaft flows into the rotor yoke radial flow channel 7 under the action of centrifugal force, then enters the rotor yoke axial flow channel 10 and is thrown out from two ports of the rotor yoke axial flow channel 10, and the cooling oil is very close to a heat source, so that the cooling effect is better.
The invention is processed on the basis of the complete rotor yoke part, has simple structure and easy realization, does not need a complex external structure to form a complete oil circuit and ensures that the rotor has good integrity. Meanwhile, when the cooling oil is used, the cooling oil is not in contact with the outer surface of the rotor, so that obvious friction loss is avoided, and efficient operation is guaranteed.
In the rotor internal oil circuit cooling structure adopted by the invention, the hollow rotating shaft 6, the rotor yoke axial flow channel 10 and the rotor yoke radial flow channel 7 exist, so that the rotor quality is greatly reduced, and the power density of the motor is further improved.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (5)
1. The cooling structure of the internal oil circuit of the rotor comprises a machine shell (1) arranged outside a motor, wherein end covers (2) are arranged at two ends of the machine shell (1), and a bearing used for supporting a hollow rotating shaft (6) is arranged between the end covers (2), and is characterized in that a rotor yoke portion (5) is arranged at the outer side end of the hollow rotating shaft (6), a rotor yoke portion radial flow channel (7) and a rotor yoke portion axial flow channel (10) are arranged inside the rotor yoke portion (5), and the rotor yoke portion radial flow channel (7) and the rotor yoke portion axial flow channel (10) respectively penetrate through the radial whole body and the axial whole body of the rotor yoke portion (5);
one side of the hollow rotating shaft (6) is provided with a hole, one side of the hole is provided with a bearing chamber (12), the outer wall of the bearing chamber (12) is provided with an oil inlet (11), and an oil outlet (8) corresponding to the oil inlet (11) is arranged at the bottom of the shell (1).
2. The structure for cooling an oil passage inside a rotor according to claim 1, wherein the water passage type of the casing (1) is one of a spiral water passage and an axial water passage.
3. The cooling structure for the oil circuit in the rotor is characterized in that the radial flow channels (7) of the rotor yoke are symmetrical about the center of the hollow rotating shaft (6), and the two end ports of the radial flow channels (7) of the rotor yoke are blocked by bolts (9).
4. A rotor internal oil path cooling structure according to claim 1, characterized in that the number of the rotor yoke axial flow passages (10) is the same as the number of the rotor yoke radial flow passages (7), and there is a one-to-one correspondence.
5. The cooling structure of the internal oil circuit of the rotor is characterized in that the permanent magnet (4) is arranged on the rotor yoke part (5), when the permanent magnet (4) adopts a Halbach array, the permanent magnet (4) forms a complete magnetic circuit, and the axial flow channel (10) of the rotor yoke part is close to the permanent magnet (4);
when the permanent magnet (4) adopts other magnetizing modes, the permanent magnet (4) needs to form a magnetic circuit by means of the magnetic conduction rotor yoke part (5), and the position of the rotor yoke part axial flow channel (10) is far away from the permanent magnet (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110280145.1A CN113036968A (en) | 2021-03-16 | 2021-03-16 | Rotor internal oil circuit cooling structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110280145.1A CN113036968A (en) | 2021-03-16 | 2021-03-16 | Rotor internal oil circuit cooling structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113036968A true CN113036968A (en) | 2021-06-25 |
Family
ID=76470739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110280145.1A Pending CN113036968A (en) | 2021-03-16 | 2021-03-16 | Rotor internal oil circuit cooling structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113036968A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113572289A (en) * | 2021-07-05 | 2021-10-29 | 合肥巨一动力***有限公司 | Oil-cooling hollow rotating shaft structure |
| CN113783343A (en) * | 2021-09-15 | 2021-12-10 | 臻驱科技（上海）有限公司 | Oil cold and hot electric drive system of test usefulness |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07250456A (en) * | 1994-03-09 | 1995-09-26 | Toyo Electric Mfg Co Ltd | Liquid cooling device for rotor of rotating electric apparatus |
| CN101656445A (en) * | 2009-09-14 | 2010-02-24 | 精进电动科技（北京）有限公司 | System and method for cooling motors |
| CN103296808A (en) * | 2012-02-29 | 2013-09-11 | 丰田自动车株式会社 | Cooling structure of rotor for rotary electric machine, and rotary electric machine |
| CN104578595A (en) * | 2015-02-10 | 2015-04-29 | 李文圣 | Cooling system of flywheel energy storage device |
| CN108336865A (en) * | 2018-03-30 | 2018-07-27 | 北京理工大学 | A kind of liquid cooling driving motor |
| CN109038951A (en) * | 2018-07-24 | 2018-12-18 | 上海大郡动力控制技术有限公司 | The cooling structure of new-energy automobile electrical drive power assembly |
| CN109155558A (en) * | 2016-08-17 | 2019-01-04 | 宝马股份公司 | Motor and vehicle with the motor |
| CN110389039A (en) * | 2018-04-23 | 2019-10-29 | 昕芙旎雅有限公司 | Rotating machinery |
| CN111030383A (en) * | 2019-12-24 | 2020-04-17 | 中国科学院声学研究所 | Self-pumping oil injection internal circulation heat dissipation motor used in low-temperature environment |
-
2021
- 2021-03-16 CN CN202110280145.1A patent/CN113036968A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07250456A (en) * | 1994-03-09 | 1995-09-26 | Toyo Electric Mfg Co Ltd | Liquid cooling device for rotor of rotating electric apparatus |
| CN101656445A (en) * | 2009-09-14 | 2010-02-24 | 精进电动科技（北京）有限公司 | System and method for cooling motors |
| CN103296808A (en) * | 2012-02-29 | 2013-09-11 | 丰田自动车株式会社 | Cooling structure of rotor for rotary electric machine, and rotary electric machine |
| CN104578595A (en) * | 2015-02-10 | 2015-04-29 | 李文圣 | Cooling system of flywheel energy storage device |
| CN109155558A (en) * | 2016-08-17 | 2019-01-04 | 宝马股份公司 | Motor and vehicle with the motor |
| CN108336865A (en) * | 2018-03-30 | 2018-07-27 | 北京理工大学 | A kind of liquid cooling driving motor |
| CN110389039A (en) * | 2018-04-23 | 2019-10-29 | 昕芙旎雅有限公司 | Rotating machinery |
| CN109038951A (en) * | 2018-07-24 | 2018-12-18 | 上海大郡动力控制技术有限公司 | The cooling structure of new-energy automobile electrical drive power assembly |
| CN111030383A (en) * | 2019-12-24 | 2020-04-17 | 中国科学院声学研究所 | Self-pumping oil injection internal circulation heat dissipation motor used in low-temperature environment |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113572289A (en) * | 2021-07-05 | 2021-10-29 | 合肥巨一动力***有限公司 | Oil-cooling hollow rotating shaft structure |
| CN113783343A (en) * | 2021-09-15 | 2021-12-10 | 臻驱科技（上海）有限公司 | Oil cold and hot electric drive system of test usefulness |
| CN113783343B (en) * | 2021-09-15 | 2023-08-22 | 臻驱科技（上海）有限公司 | Oil cooling electric driving system for test |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207150378U (en) | A kind of axial permanent magnetic auxiliary radial direction magnetic resistance high-speed electric expreess locomotive with combination cooling structure | |
| CN113036968A (en) | Rotor internal oil circuit cooling structure | |
| RU2728758C1 (en) | Cooling device for reducing temperature of permanent magnet in motor with permanent magnets | |
| WO2017202316A1 (en) | Double-antipode permanent magnet synchronous motor and electric vehicle | |
| CN114024379B (en) | Cooling system of stator permanent magnet type axial magnetic field permanent magnet motor | |
| US20190181708A1 (en) | Rotary electrical machine | |
| CN110460198A (en) | High-speed permanent magnet motor | |
| KR102617452B1 (en) | Motor rotor with cooling | |
| CN115224834A (en) | Permanent magnet synchronous motor capable of preventing high-temperature interference | |
| CN112186933A (en) | Stator winding cooling assembly of back-wound motor | |
| CN103580422A (en) | Air-cooling heat dissipation structure of permanent magnet synchronous motor stator | |
| CN112383191B (en) | Self-fan cold axial flux motor with external centrifugal fan | |
| CN212231186U (en) | High-speed permanent magnet shielding motor with hybrid cooling system | |
| CN212085910U (en) | Hybrid cooling outer rotor permanent magnet motor | |
| CN112910207A (en) | Double-stator single-rotor disc type motor | |
| CN112152345A (en) | Motor cooling system and motor | |
| CN219287256U (en) | High-speed motor | |
| WO2017202318A1 (en) | Punching plate for motor rotor, motor rotor, motor, and electric vehicle | |
| CN218276240U (en) | Oil-cooled motor | |
| CN218335566U (en) | Air-water-cooled magnetic suspension motor and fan with same | |
| CN110601390A (en) | Permanent magnet motor | |
| CN102891565A (en) | High-power density permanent magnet motor cooling system | |
| CN113904469A (en) | Double inner-cooling type high-speed induction motor with axial multi-section rotor chute | |
| CN109038949A (en) | A kind of rotor cooling structure suitable for totally-enclosed interior permanent magnet machines | |
| CN112713716B (en) | Closed motor with internal and external cooling wind path and motor base |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210625 |
|
| RJ01 | Rejection of invention patent application after publication |