CN111342597A - Rotor oil cooling permanent magnet motor - Google Patents
Rotor oil cooling permanent magnet motor Download PDFInfo
- Publication number
- CN111342597A CN111342597A CN202010137269.XA CN202010137269A CN111342597A CN 111342597 A CN111342597 A CN 111342597A CN 202010137269 A CN202010137269 A CN 202010137269A CN 111342597 A CN111342597 A CN 111342597A
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- China
- Prior art keywords
- rotor
- oil
- permanent magnet
- flow channel
- sliding bearing
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Classifications
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- 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
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
- H02K5/1672—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings radially supporting the rotary shaft at both ends of the rotor
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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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- 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
- H02K9/193—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium
Abstract
The invention discloses a rotor oil-cooled permanent magnet motor, which consists of a stator component, a permanent magnet rotor, a first sliding bearing and a second sliding bearing on the left side and the right side, wherein the permanent magnet rotor comprises a rotating shaft, a rotor bracket, a rotor yoke part and a permanent magnet magnetic pole; the application object of the invention is a low-speed permanent magnet motor provided with a sliding bearing, which fully utilizes the original lubricating oil for lubricating and cooling the sliding bearing, and realizes direct oil cooling of the permanent magnet magnetic pole only by less improvement of arranging a runner on a rotating shaft and a rotor yoke part; the invention does not basically increase the volume weight of the original motor and the complexity of the sliding bearing, the cooling effect is obviously superior to the traditional air cooling, and no extra noise is generated; the static pressure and dynamic pressure scheme, the flow channel and the heat pipe structure provided by the invention can be selected by motors with different rotating speeds.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a rotor oil-cooled permanent magnet motor.
Background
The existing permanent magnet motor has the advantages of high efficiency, small volume and weight, simple maintenance and the like, and is widely applied to the field of low-speed direct drive. In the low-speed direct-drive fields of ship electric propulsion, mining direct drive and the like, the permanent magnet motor generally adopts an oil lubrication sliding bearing due to low rotating speed and high power.
For the permanent magnet direct drive motor in the field, a stator is an armature winding, and a rotor is a permanent magnet pole. The stator generally adopts the water-cooling structure, and the insulating temperature resistant grade of stator can reach 180 ℃ or even higher, so the stator cooling is relatively easy. Although the permanent magnet rotor has small self-heating value, because the permanent magnet rotor is difficult to surround and cool by a heated stator, and a cooling water path is generally positioned at the excircle of the stator, the temperature of a permanent magnet magnetic pole is determined to exceed the temperature of a stator core on the premise of not taking a rotor cooling measure, and the permanent magnet material of the rotor is more sensitive to the temperature (the neodymium iron boron is generally required to work below 120 ℃), at the moment, only the load of the stator can be reduced, the volume and the weight of the motor are increased, or the heat resistance grade of the permanent magnet material is improved, the cost is increased, and the magnetic load of the rotor is also reduced (the higher the temperature is, the.
In order to realize the simultaneous existence of a high-temperature stator and a low-temperature permanent magnet rotor, give full play to the material performance to the maximum extent, and reduce the volume weight and the cost of the permanent magnet direct drive motor, the permanent magnet rotor must be cooled. At present, the rotor cooling of the permanent magnet direct drive motor is mainly air cooling and comprises two structures of forced ventilation and a self-contained fan. Forced draft needs to introduce active fan, will form the wind channel in the motor inside, though the cooling effect is good, has increased the structure complexity, has also increased the noise. The fan is arranged on the rotor, when the rotor rotates, the fan blade drives the air inside the motor to locally circulate, the magnetic poles of the rotor are cooled, the cooling effect is general due to low rotating speed, the longer permanent magnet rotor is difficult to cool, and if the rotating speed of the motor is low, an effective air path is difficult to form due to the fan.
Disclosure of Invention
The invention provides a rotor oil-cooled permanent magnet motor which is suitable for a low-speed permanent magnet motor provided with an oil lubrication sliding bearing and aims at the defects that the cooling effect of a permanent magnet rotor of the existing low-speed direct-drive permanent magnet motor with a fan is poor or the structure is complex, and the noise of a forced ventilation permanent magnet motor is large.
The technical scheme adopted by the invention for solving the technical problems is as follows: a rotor oil-cooled permanent magnet motor comprises a stator component, a permanent magnet rotor and sliding bearings on the left side and the right side, wherein the stator component is a conventional alternating current motor stator, the permanent magnet rotor comprises a rotating shaft, a rotor bracket, a rotor yoke part and a permanent magnet magnetic pole, a central flow channel is arranged in a central hole of the rotating shaft, two shaft shoulders are arranged at a driving end of the rotating shaft, an L-shaped flow channel communicated with the central flow channel is discontinuously arranged in each shaft shoulder, each sliding bearing comprises a first sliding bearing with thrust at the driving end and a second sliding bearing with radial support at a non-driving end, each first sliding bearing comprises a first bearing seat and a first bearing bush, a first oil inlet and a first oil outlet are respectively arranged at the upper end and the lower end of each first bearing seat, each first bearing bush is arranged between the two shaft shoulders and is communicated with the first oil inlet through an internal flow channel, and a pressure lubricating oil part overflowing from the first, other lubricating oil is discharged from the first oil outlet, a first sealing part for preventing the lubricating oil from leaking is formed between the first bearing seat and the rotating shaft, a second sealing part which compresses lubricating oil to flow through the central flow passage through the pressure cavity so as to realize the cooling of the permanent magnetic pole is formed between the first bearing seat and the shaft shoulder, the second sliding bearing consists of a second bearing seat and a second bearing bush, a second oil inlet and a second oil outlet are respectively arranged at the upper end and the lower end of the second bearing seat, lubricating oil which flows out of the first sliding bearing and cools the rotating shaft enters the second sliding bearing through the central flow passage and the radial flow passage and is finally mixed with the lubricating oil entering from the second oil inlet, and the lubricating oil of the sliding bearing flows in a flow passage formed among the first sliding bearing, the rotating shaft and the second sliding bearing, so that the lubricating oil cools the permanent magnetic pole.
A rotor oil-cooled permanent magnet motor, be provided with radial runner and axial runner in its rotor support and rotor yoke portion respectively, the inside central authorities of pivot set up the shutoff portion, the shutoff is carried out the center runner on center hole both sides, guarantees that lubricating oil gets into radial runner and axial runner along center runner, realizes the cooling to the permanent magnet magnetic pole.
The rotor oil-cooled permanent magnet motor is characterized in that heat pipes are respectively arranged in a rotor bracket and a rotor yoke part of the rotor oil-cooled permanent magnet motor, the heat pipes are mutually connected and extend to a central flow channel in a rotating shaft, and the heat pipes collect heat of a permanent magnet pole and transmit the heat to the central flow channel to be taken away by lubricating oil flowing through the central flow channel.
The invention has the beneficial effects that: aiming at a low-speed permanent magnet motor provided with a sliding bearing, the lubricating oil originally used for lubricating and cooling the sliding bearing is fully utilized, and direct oil cooling of a permanent magnet magnetic pole is realized only by less improvement of arranging a runner on a rotating shaft and a rotor yoke part; the invention does not basically increase the volume weight of the original motor and the complexity of the sliding bearing, the cooling effect is obviously superior to the traditional air cooling, and no extra noise is generated; the static pressure and dynamic pressure scheme, the flow channel and the heat pipe structure provided by the invention can be selected by motors with different rotating speeds.
The invention can be designed into two structures, namely a flow channel structure and a heat pipe structure, at the permanent magnetic pole section of the rotor: the runner structure is provided with radial runners and axial runners respectively on the rotor support and the rotor yoke part, and lubricating oil directly flows to the rotor yoke part to realize the cooling of the permanent magnetic pole; the heat pipe structure is provided with the heat pipes near the permanent magnetic poles and is connected with lubricating oil flowing through the central hole of the rotating shaft, the heat pipes collect heat of the permanent magnetic poles and transmit the heat to the lubricating oil, the path of the heat pipe structure is short, and the lubricating oil flows in the center of the rotating shaft, so that the heat pipe structure is suitable for a motor with high rotating speed and low pressure requirement on the lubricating oil.
Drawings
Fig. 1 is a front view of a motor structure according to a first embodiment of the present invention;
FIG. 2 is a cross-sectional view of a permanent magnet rotor of the present invention;
FIG. 3 is an enlarged view of a portion of the first sliding bearing;
FIG. 4 is an enlarged fragmentary view of the second plain bearing;
fig. 5 is a schematic structural diagram of a motor according to a second embodiment of the present invention.
The figures are numbered: 1-permanent magnet rotor, 2-first slide bearing, 3-stator module, 4-second slide bearing, 1.1-pivot, 1.2-shaft shoulder, 1.3-rotor support, 1.4-rotor yoke portion, 1.5-permanent magnetism magnetic pole, 1.6-heat pipe, 2.1-first oil-out, 2.2-first axle bush, 2.3-first bearing frame, 2.4-first oil inlet, 4.1-second oil-out, 4.2-second axle bush, 4.3-second bearing frame, 4.4-second oil inlet.
Detailed Description
The invention will be further explained with reference to the drawings.
Example 1
Fig. 1 and 2 show a basic embodiment of the rotor oil-cooled permanent magnet motor based on the flow channel structure. The motor comprises a stator component 3, a permanent magnet rotor 1, sliding bearings on the left side and the right side, the stator component is a conventional alternating current motor stator, an inner rotor is in a radial surface-mounted permanent magnet magnetic pole type, the permanent magnet rotor 1 comprises a rotating shaft 1.1, a rotor support 1.3, a rotor yoke portion 1.4 and a permanent magnet magnetic pole 1.5, a first sliding bearing 2 with thrust is arranged at a driving end, a second sliding bearing 4 only supported in a radial direction is arranged at a non-driving end, a central hole of the rotating shaft 1.1 is an axial flow channel of lubricating oil, the flow channel needs to be blocked according to a specific structure, two shaft shoulders 1.2 are arranged at the driving end of the rotating shaft 1.1, in order to reduce the influence of an opening on the strength and the rigidity of the rotating shaft as much as possible, the shaft shoulders 1.2 are high-pressure lubricating oil inlets, and L-shaped flow channels communicated.
As shown in fig. 3, the first sliding bearing 2 is composed of a first bearing seat 2.3 and a first bearing bush 2.2, the upper end and the lower end of the first bearing seat 2.3 are respectively provided with a first oil inlet 2.4 and a first oil outlet 2.1, the first bearing bush 2.2 is arranged between two shaft shoulders 1.2, the bearing bush and the shaft shoulders rotate relatively, the first oil inlet 2.4 is communicated through an internal flow passage, a pressure lubricating oil part overflowed from the first bearing bush 2.2 enters a central flow passage of the rotating shaft 1.1 along an L-shaped flow passage, other lubricating oil is discharged from the first oil outlet 2.1, wherein the first bearing bush 2.2 is composed of a thrust bush and a radial bush, the lubricating oil entering the first bearing bush 2.2 from the top of the bearing flows through friction surfaces of the thrust bush and the radial bush to generate dynamic pressure (or directly high pressure oil is supplied from the outside), and a knife edge seal is adopted between the shaft shoulder 1.2 and the bearing seat 2.3 to maintain the oil pressure at the position.
Considering the strength of the rotating shaft 1.1, an L-shaped hole is formed at the shaft shoulder 1.2 (the hole can be formed by firstly forming a through hole and then welding and blocking an outer opening).
The rotor support 1.3 and the rotor yoke portion 1.4 are respectively provided with a radial flow channel and an axial flow channel, lubricating oil directly flows to the rotor yoke portion 1.4, the permanent magnet magnetic pole 1.5 is cooled, the flow channel structure path is long, the pressure of the lubricating oil is high, and the lubricating oil is not suitable for a rotor with high linear speed; the central part of the inner part of the rotating shaft 1.1 is provided with a plugging part for plugging the central flow passages at two sides of the central hole, so that lubricating oil is ensured to enter the radial flow passages and the axial flow passages along the central flow passages, and the permanent magnetic pole 1.5 is cooled.
First bearing frame 2.3 and pivot 1.1 and shaft shoulder 1.2 between form first sealing (seal 1 in the picture) and second sealing (seal 2 in the picture) respectively, sealed 1 prevents that lubricating oil from revealing, 2 inside pressure chambeies that form of sealed, pressure chamber oppression lubricating oil flows through centre channel to the realization is to permanent magnetism magnetic pole 1.5 cooling, the pressure source of lubricating oil has two kinds in the inside pressure chamber: one is high-pressure lubricating oil which is directly injected from the first oil inlet 2.4 to realize static pressure lubrication, and the other is dynamic pressure generated by dynamic pressure lubrication among the bearing bush 2.2, the rotating shaft 1.1 and the shaft shoulder 1.2 when the rotating shaft 1.1 rotates.
As shown in fig. 4, the second sliding bearing 4 is an outlet of the lubricating oil, where the flow passage outlet is an open structure without pressure, and is composed of a second oil outlet 4.1, a second bearing bush 4.2, a second bearing block 4.3, and a second oil inlet 4.4. The second bearing seat 4.3 and the rotating shaft 1.1 form a seal to prevent lubricating oil from leaking, a radial flow passage is formed in the rotating shaft 1.1 and is blocked at the end part of the rotating shaft 1.1, the lubricating oil which flows out of the first sliding bearing 2 and cools the permanent magnetic pole 1.5 enters the second sliding bearing 4 through the central flow passage and the radial flow passage, is finally mixed with the lubricating oil entering the second oil inlet 4.4 and is discharged through the second oil outlet 4.1, and the lubricating oil of the sliding bearing flows in the flow passage formed among the first sliding bearing 2, the rotating shaft 1.1 and the second sliding bearing 4 to cool the permanent magnetic pole.
The shaft 1.1 of the present embodiment can be manufactured as follows: firstly, a central blind hole with steps is processed from a non-driving end, a spigot is arranged at a position needing to be plugged in the middle, the chock blocks are sequentially placed from the non-driving end to respective spigot positions, then the chock blocks and the rotating shaft 1.1 are drilled and tapped together, the chock blocks and the rotating shaft 1.1 are fixed through bolts, gaps are filled with glue, and oil leakage is guaranteed.
In consideration of strength, radial holes of the rotor support 1.3 and the rotating shaft 1.1 are formed in the rotor support 1.3, after the respective holes are aligned, the inner side and the outer side are welded to ensure that oil does not leak, and if the difference between the outer diameter of the rotor and the diameter of the rotating shaft is larger, a transition oil collecting groove can be arranged at a proper radial position of the rotor support 1.3.
The axial flow channel of the rotor yoke part 1.4 can adopt a double-layer structure, namely an inner cylinder is welded with the rotor supports 1.3 at two ends, the outer circle of the inner cylinder is provided with an axial flow channel (oil groove), an outer cylinder is sleeved outside the inner cylinder in a hot mode, two ends of the outer cylinder are welded to ensure that oil is not leaked, and the permanent magnetic pole 1.5 is installed on the outer circle of the outer cylinder.
Example 2
Fig. 5 shows a basic embodiment of the rotor oil-cooled permanent magnet motor based on the heat pipe structure of the present invention. This embodiment differs from embodiment 1 in the rotor permanent magnet pole segments.
The rotor support 1.3 and the rotor yoke portion 1.4 of the present embodiment are respectively provided with a heat pipe 1.6, the heat pipes 1.6 are connected with each other and extend to the central flow channel, and the heat pipes 1.6 collect heat of the permanent magnetic poles 1.5 and transfer the heat to the central flow channel, and are taken away by lubricating oil; the heat pipe structure has short lubricating oil flow passage path, and the lubricating oil flows in the center of the rotating shaft, so that the heat pipe structure is suitable for high rotating speed and has low requirement on the pressure of the lubricating oil.
The rotating shaft 1.1 of the embodiment can be used for processing a central blind hole from a non-driving end and is welded and plugged by a chock block at the non-driving end. An axial hole is formed in the rotor yoke portion 1.4, the heat pipe 1.6 is plugged in, good contact between the heat pipe 1.6 and the rotor yoke portion 1.4 is guaranteed, the heat pipe 1.6 penetrates into a center hole of the rotating shaft 1.1 from the inner side and the outer side, and oil leakage is guaranteed through welding. When the number of the heat pipes 1.6 is large, a transition step should be arranged at the corresponding position of the rotating shaft 1.1 to increase the strength of the rotating shaft 1.1.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (7)
1. The utility model provides a rotor oil cooling permanent-magnet machine comprises stator module (3), permanent-magnet rotor (1) and slide bearing, permanent-magnet rotor (1) is including pivot (1.1), rotor spider (1.3), rotor yoke portion (1.4) and permanent magnetism magnetic pole (1.5), its characterized in that: the improved lubricating oil sealing structure is characterized in that a central flow channel is arranged in the rotating shaft (1.1), two shaft shoulders (1.2) are arranged at the driving end of the rotating shaft (1.1), an L-shaped flow channel communicated with the central flow channel is arranged in each shaft shoulder (1.2), each sliding bearing comprises a first sliding bearing (2) located at the driving end and provided with thrust and a second sliding bearing (4) located at the non-driving end and only radially supported, each first sliding bearing (2) consists of a first bearing seat (2.3) and a first bearing bush (2.2), a first oil inlet (2.4) and a first oil outlet (2.1) are respectively arranged at the upper end and the lower end of each first bearing seat (2.3), each first bearing bush (2.2) is arranged between the two shaft shoulders (1.2), each first oil inlet (2.4) is communicated through the internal flow channel, a first sealing part for preventing lubricating oil from leaking is formed between each first bearing seat (2.3) and the rotating shaft shoulders (1.2), and lubricating oil flowing through the central flow channel formed between each first bearing seat (2), and the lubricating oil pressing channel And the second sliding bearing (4) consists of a second bearing seat (4.3) and a second bearing bush (4.2), the upper end and the lower end of the second bearing seat (4.3) are respectively provided with a second oil inlet (4.4) and a second oil outlet (4.1), and lubricating oil enters the second sliding bearing (4) through a central flow passage and is mixed with the lubricating oil entering the second oil inlet (4.4) and is discharged through the second oil outlet (4.1), so that the permanent magnetic pole (1.5) is cooled.
2. The rotor oil-cooled permanent magnet motor according to claim 1, characterized in that the rotor support (1.3) and the rotor yoke portion (1.4) are respectively provided with a radial flow channel and an axial flow channel therein, and a plugging portion is provided at the center inside the rotating shaft (1.1) for plugging the central flow channels at both sides, so as to ensure that the lubricating oil enters the radial flow channel and the axial flow channel along the central flow channels, thereby cooling the permanent magnet poles (1.5).
3. A rotor oil-cooled permanent magnet machine according to claim 1, characterized in that heat pipes (1.6) are arranged in the rotor support (1.3) and the rotor yoke (1.4), respectively, the heat pipes (1.6) are connected with each other and extend to the central flow channel, and the heat pipes (1.6) collect the heat of the permanent magnet poles (1.5) and transfer the heat to the central flow channel to be carried away by the lubricant oil.
4. A rotor oil-cooled permanent magnet machine according to claim 2 or 3, characterized in that the first bearing shell (2.2) consists of a thrust shell and a radial shell.
5. A rotor oil-cooled permanent magnet machine according to claim 2, characterized in that the rotor support (1.3) is provided with a transition oil sump radially inside.
6. A rotor oil-cooled permanent magnet machine according to claim 2, characterized in that the axial flow channels in the rotor yoke (1.4) are of a double-layer structure.
7. A rotor oil-cooled permanent magnet motor according to claim 6, characterized in that the rotor yoke (1.4) is formed by connecting an inner cylinder and an outer cylinder in a shrink fit, the two layers of axial flow channels are respectively arranged on the two cylinders, and the permanent magnet poles (1.5) are arranged on the outer cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010137269.XA CN111342597B (en) | 2020-03-02 | 2020-03-02 | Rotor oil cooling permanent magnet motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010137269.XA CN111342597B (en) | 2020-03-02 | 2020-03-02 | Rotor oil cooling permanent magnet motor |
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| Publication Number | Publication Date |
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| CN111342597A true CN111342597A (en) | 2020-06-26 |
| CN111342597B CN111342597B (en) | 2021-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010137269.XA Active CN111342597B (en) | 2020-03-02 | 2020-03-02 | Rotor oil cooling permanent magnet motor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111981048A (en) * | 2020-08-10 | 2020-11-24 | 冯燕兵 | Intermediate bearing for ship |
| DE102020127807A1 (en) | 2020-10-22 | 2022-04-28 | Seg Automotive Germany Gmbh | Electrical machine with a stator and a rotor |
| US20220239197A1 (en) * | 2021-01-27 | 2022-07-28 | Honda Motor Co., Ltd. | Electric motor cooling structure |
| US11482908B1 (en) * | 2021-04-12 | 2022-10-25 | Infinitum Electric, Inc. | System, method and apparatus for direct liquid-cooled axial flux electric machine with PCB stator |
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| CN101305510A (en) * | 2005-11-09 | 2008-11-12 | 株式会社东芝 | Rotor for electric rotating machine and electric rotating machine |
| CN102983663A (en) * | 2012-11-30 | 2013-03-20 | 南阳防爆集团股份有限公司 | Self-lubricating sliding bearing for high-speed large-power motor |
| CN108075595A (en) * | 2017-12-19 | 2018-05-25 | 卧龙电气集团股份有限公司 | A kind of late-model inline pump motor special |
| CN108123567A (en) * | 2016-11-28 | 2018-06-05 | 李兴强 | A kind of New-type electric machine |
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2020
- 2020-03-02 CN CN202010137269.XA patent/CN111342597B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101305510A (en) * | 2005-11-09 | 2008-11-12 | 株式会社东芝 | Rotor for electric rotating machine and electric rotating machine |
| CN102983663A (en) * | 2012-11-30 | 2013-03-20 | 南阳防爆集团股份有限公司 | Self-lubricating sliding bearing for high-speed large-power motor |
| CN108123567A (en) * | 2016-11-28 | 2018-06-05 | 李兴强 | A kind of New-type electric machine |
| CN108075595A (en) * | 2017-12-19 | 2018-05-25 | 卧龙电气集团股份有限公司 | A kind of late-model inline pump motor special |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111981048A (en) * | 2020-08-10 | 2020-11-24 | 冯燕兵 | Intermediate bearing for ship |
| DE102020127807A1 (en) | 2020-10-22 | 2022-04-28 | Seg Automotive Germany Gmbh | Electrical machine with a stator and a rotor |
| US20220239197A1 (en) * | 2021-01-27 | 2022-07-28 | Honda Motor Co., Ltd. | Electric motor cooling structure |
| US11482908B1 (en) * | 2021-04-12 | 2022-10-25 | Infinitum Electric, Inc. | System, method and apparatus for direct liquid-cooled axial flux electric machine with PCB stator |
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| CN111342597B (en) | 2021-06-25 |
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