CN113937945A - Permanent magnet motor for cooling bearing and electric locomotive - Google Patents
Permanent magnet motor for cooling bearing and electric locomotive Download PDFInfo
- Publication number
- CN113937945A CN113937945A CN202111233191.2A CN202111233191A CN113937945A CN 113937945 A CN113937945 A CN 113937945A CN 202111233191 A CN202111233191 A CN 202111233191A CN 113937945 A CN113937945 A CN 113937945A
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- Prior art keywords
- stator
- air
- air duct
- bearing
- cooling
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- 238000001816 cooling Methods 0.000 title claims abstract description 33
- 230000003137 locomotive effect Effects 0.000 title claims abstract description 12
- 239000000498 cooling water Substances 0.000 claims description 15
- 238000005192 partition Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 9
- 238000007789 sealing Methods 0.000 description 4
- 230000001154 acute effect Effects 0.000 description 3
- 239000000110 cooling liquid Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
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
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/207—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium with openings in the casing specially adapted for ambient air
-
- 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
- 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
- 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
- H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention discloses a permanent magnet motor for cooling a bearing, wherein a rotating shaft and a rotor inner core are circumferentially and relatively fixed, the rotating shaft is rotatably arranged on a stator shell through two groups of bearings, and the rotating shaft and the rotor inner core can synchronously rotate relative to the stator shell; the stator shell is provided with a stator outer air duct, each group of bearings is at least correspondingly provided with one stator outer air duct, openings at two ends of the stator outer air duct are respectively communicated with the outside to form an air inlet and an air outlet, and the middle part of the stator outer air duct is close to the inner end part of each bearing; the air intake in the outer wind channel of stator is towards the walking direction of vehicle, and the air outlet is the walking direction of vehicle dorsad, and the air current gets into from the air intake, flows along the outer wind channel of stator to discharge from the air outlet, the pivot is walked around to the air current that produces during the vehicle walking, when the air current through the outer wind channel of stator, can absorb the heat that the bearing gived off, and take out along with the air current, to bearing cooling, promote the radiating effect of motor inner bearing. The electric locomotive related to the invention can realize the same technical effect.
Description
Technical Field
The invention relates to the field of motors, in particular to a permanent magnet motor for cooling a bearing. The invention also relates to an electric locomotive.
Background
The electric locomotive is driven by the motor to run, the motor generates a large amount of heat when working, and in the conventional technical scheme, the heat in the motor is taken away by mainly utilizing the fact that cooling liquid flows through water channels distributed on a stator base.
The cooling liquid flows through the water channel on the stator, the cooling structure can effectively realize the heat dissipation of the stator, but can not directly cool the rotor, the bearing and other parts in the permanent magnet motor, so that the heat in the motor can not be effectively dissipated, an isothermal body is easy to form, the exertion of the power and the torque of the motor is limited, and particularly the motor with high torque density, high power density and compact structure. The bearing works in a high-temperature environment for a long time, and is easy to break down, so that the normal operation of the permanent magnet motor is influenced.
For those skilled in the art, how to better cool down the motor bearing is a technical problem to be solved at present.
Disclosure of Invention
The invention provides a permanent magnet motor for cooling a bearing, which introduces traveling wind into a stator shell by arranging an outer stator air duct, absorbs and transfers heat generated by the bearing, reduces the temperature of the bearing and prolongs the service life, and the specific scheme is as follows:
a permanent magnet motor for cooling a bearing comprises a stator shell, a rotor inner core and a rotating shaft, wherein the rotating shaft and the rotor inner core are circumferentially and relatively fixed, and the rotating shaft is rotatably arranged on the stator shell through two groups of bearings;
the stator shell is provided with a stator outer air duct, each group of bearings is at least correspondingly provided with one stator outer air duct, two ends of the stator outer air duct are respectively communicated with the outside to form an air inlet and an air outlet, and the middle part of the stator outer air duct is close to the inner end part of each bearing;
the air inlet of the stator outer air duct faces the traveling direction of the vehicle, and the air outlet of the stator outer air duct faces away from the traveling direction of the vehicle; and air flow generated when the vehicle runs bypasses the rotating shaft, and the bearing is cooled.
Optionally, the air inlet and the air outlet of the stator outer air duct are arranged on the same side of the stator housing;
and the part of the stator outer air duct close to the air inlet and the air outlet forms an included angle with the walking direction.
Optionally, the stator outer air duct includes an air inlet section and an air outlet section that extend linearly, the air inlet section and the air outlet section are respectively in butt joint with and communicated with an annular bypass section, and the bypass section surrounds the rotating shaft.
Optionally, an induced draft cover is installed on an outer wall of the stator housing, an air inlet and an air outlet of the stator outer air duct respectively correspond to one induced draft cover, and the induced draft cover is used for guiding air flows entering and exiting; and is capable of filtering the airflow.
Optionally, a cooling water channel is arranged in the stator housing, and the cooling water channel is used for circulating cooling water.
Optionally, a partition is arranged in the stator shell along the circumferential direction, the partition and the rotor inner core are in relative sliding contact sealing, and a closed cavity is formed in the stator shell in a partition mode.
Optionally, the rotor inner core is provided with internal circulation fan blades, and the internal circulation fan blades are positioned in the closed cavity; when the internal circulation fan blades rotate along with the rotor inner core, the closed cavity forms circulation airflow.
Optionally, the rotor inner core is located in the position of the closed cavity, a rotor air duct is axially formed in the position of the closed cavity, the stator shell is located in the position of the closed cavity, an inner stator air duct is axially formed in the position of the closed cavity, and air flow generated by the inner circulation fan blades flows between the inner stator air duct and the rotor air duct in a circulating mode.
The invention also discloses an electric locomotive which comprises the permanent magnet motor for cooling the bearing.
The invention provides a permanent magnet motor for cooling a bearing, wherein a rotating shaft and a rotor inner core are circumferentially and relatively fixed, the rotating shaft is rotatably arranged on a stator shell through two groups of bearings, and the rotating shaft and the rotor inner core can synchronously rotate relative to the stator shell; the stator shell is provided with a stator outer air duct, each group of bearings is at least correspondingly provided with one stator outer air duct, openings at two ends of the stator outer air duct are respectively communicated with the outside to form an air inlet and an air outlet, and the middle part of the stator outer air duct is close to the inner end part of each bearing; the air intake in the outer wind channel of stator is towards the walking direction of vehicle, and the air outlet is the walking direction of vehicle dorsad, and the air current gets into from the air intake, flows along the outer wind channel of stator to discharge from the air outlet, the pivot is walked around to the air current that produces during the vehicle walking, when the air current through the outer wind channel of stator, can absorb the heat that the bearing gived off, and take out along with the air current, to bearing cooling, promote the radiating effect of motor inner bearing. The electric locomotive related to the invention can realize the same technical effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional structural view of a permanent magnet motor for cooling a bearing according to the present invention;
FIG. 2 is a schematic structural diagram of an outer air duct of a stator;
fig. 3 is a partial cross-sectional structural view of a permanent magnet motor for cooling bearings according to the present invention.
The figure includes:
the air cooling structure comprises a stator shell 1, a cooling water channel 11, a separator 12, a stator inner air channel 13, a rotor inner core 2, an inner circulating fan blade 21, a rotor air channel 22, a rotating shaft 3, a bearing 4, a stator outer air channel 5, an air inlet section 51, a flow winding section 52, an air outlet section 53 and an induced draft cover 6.
Detailed Description
The core of the invention is to provide a permanent magnet motor for cooling a bearing, wherein traveling wind is introduced into a stator shell by arranging an outer stator air duct, so that heat generated by the bearing is absorbed and transferred, the temperature of the bearing is reduced, and the service life of the bearing is prolonged.
In order to make those skilled in the art better understand the technical solution of the present invention, the bearing-cooled permanent magnet motor and the electric locomotive according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The permanent magnet motor for cooling the bearing comprises a stator shell 1, a rotor inner core 2, a rotating shaft 3, a bearing 4 and the like; fig. 1 is a schematic cross-sectional view of a permanent magnet motor for cooling a bearing according to the present invention; the rotating shaft 3 and the rotor core 2 are circumferentially and relatively fixed, and the rotating shaft 3 and the rotor core 2 keep synchronous rotation; the rotating shaft 3 is rotatably mounted on the stator housing 1 through two sets of bearings 4, and the rotating shaft 3 and the rotor core 2 synchronously rotate relative to the stator housing 1.
Two sets of bearings 4 are located stator housing 1 and are close to the position at both ends respectively, as shown in fig. 1, and bearing 4 is located the lateral wall position of stator housing 1 respectively, and two bearings 4 are bigger to the support interval of pivot 3, can guarantee pivot 3 pivoted stability. Stator core A is fixed to the inner chamber of stator housing 1, and fixed mounting rotor core B on rotor core 2, the during operation produces the moment of torsion between stator core A and the rotor core B, for rotor core 2 provides power, rotor core 2 and then 3 output rotations of drive pivot.
Stator housing 1 sets up stator outer wind channel 5, and every group bearing 4 corresponds at least and sets up a stator outer wind channel 5, and stator outer wind channel 5 is the channel type structure that both ends link up, and the both ends of stator outer wind channel 5 communicate with the external world respectively and form air intake and air outlet, and external air current flows in from the air intake, moves and follow the air outlet and discharge along stator outer wind channel 5.
As shown in fig. 2, it is a schematic structural diagram of the stator outer duct 5; the middle part of the stator outer air duct 5 is close to the inner end part of the bearing 4, and the outer end part of the bearing 4 is close to the outer surface of the stator shell 1; the outer end of the bearing 4 means an end close to the outer surface of the stator housing 1, the inner end means an end close to the inner cavity of the stator housing 1, the left side surface of the bearing 4 in fig. 2 is the outer end, and the right side surface is the inner end.
The invention is illustrated in the accompanying drawings, which correspond to schematic drawings in top plan view; the advancing direction of the vehicle walking is towards the upper part in the figure, as shown by a hollow large arrow in the figure, the air inlet of the stator outer air duct 5 faces the walking direction of the vehicle, the air outlet is back to the walking direction of the vehicle, walking wind generated when the vehicle walks can enter from the air inlet and moves along the arrow marked by the label I and the arrow marked by the label II in the figure, and the arrows marked by the label I and the label II are respectively the moving paths of airflow along the two stator outer air ducts 5 and are finally discharged from the air outlet; the air flow generated when the vehicle travels bypasses the rotating shaft 3 to cool the bearing 4.
It should be noted that the air inlet of the stator outer air duct 5 faces the traveling direction of the vehicle, and does not mean that the stator outer air duct 5 must be arranged on the windward side of the stator housing 1, but may also be arranged on the side wall of the stator housing 1 parallel to the traveling direction, that is, as shown in the attached drawings of the present application, the air inlet of the stator outer air duct 5 faces an acute angle with the traveling direction, so that the air flow can enter the stator outer air duct as well, and the space occupation of the stator housing 1 can be reduced as much as possible.
Through the introduction, the air flow generated by the permanent magnet motor for cooling the bearing in the invention when the permanent magnet motor travels with a vehicle bypasses the rotating shaft, and the air flow absorbs the heat emitted by the bearing through the air duct outside the stator and brings the heat out along with the air flow, so that the bearing is cooled, and the heat dissipation effect of the bearing inside the motor is improved.
On the basis of the scheme, the air inlet and the air outlet of the stator outer air duct 5 are arranged on the same side of the stator shell 1, namely as shown in the attached drawings of the application, the air inlet and the air outlet of the stator outer air duct 5 are both arranged on the side wall of the stator shell 1 parallel to the walking direction, the part of the stator outer air duct 5 close to the air inlet and the air outlet forms an included angle with the walking direction, the included angle is an acute angle, and airflow flows along the direction guided by the stator outer air duct 5 to absorb and carry out heat generated by the stator shell 1 and a bearing, so that the cooling effect is achieved. Of course, besides the preferred mode, the stator outer air duct 5 may also be arranged in a linear structure, that is, the axis of the stator outer air duct 5 is parallel to the traveling direction, the air inlet is located on the side wall facing the windward side, and the air outlet is located on the other opposite side wall.
Further, as shown in fig. 2, the stator outer duct 5 of the present invention includes a straight-line extending air inlet section 51 and an air outlet section 53, both the air inlet section 51 and the air outlet section 53 are of a straight-line channel structure, and the axes of the air inlet section 51 and the air outlet section 53 form an acute angle with the traveling direction; the air flow section 52 is circular and is arranged around the rotating shaft 3, the air inlet section 51 and the air outlet section 53 are respectively in butt joint with the annular air flow section 52, air flow sequentially flows through the air inlet section 51, the air flow section 52 and the air outlet section 53, and when the air flow section 52 passes through, the air flow section bypasses the side of the rotating shaft 3.
Specifically, the air inducing cover 6 is arranged on the outer wall of the stator shell 1, an air inlet and an air outlet of the stator outer air duct 5 respectively correspond to the air inducing cover 6, the air inducing cover 6 is a groove-shaped shell structure and covers and surrounds the air inlet and the air outlet; the induced draft hood 6 is used for guiding the air flow entering and exiting, and has a filtering effect on the air flow, so that the entering of impurities is reduced. The surface of the induced draft cover 6 is provided with reticular openings, and the size of the mesh openings is determined according to the requirement of the working environment.
Specifically, in the present invention, a cooling water channel 11 is provided in the stator housing 1, and the cooling water channel 11 is used for circulating cooling water, as shown in fig. 3, which is a partial cross-sectional structure diagram of the permanent magnet motor for cooling the bearing of the present invention; the cooling water channel 11 is the sandwich structure that stator housing 1 lateral wall set up, and the both ends of cooling water channel 11 link up, and inside can let in the cooling water, cools off stator housing 1 through the mode of liquid cooling. Arrows denoted by symbol c in the drawing indicate the movement paths of the coolant flowing through the coolant passage 11.
As shown in fig. 1 and 3, the stator housing 1 is provided with the spacers 12 along the circumferential direction, and the spacers 12 are distributed annularly and are consistent with the rotation circumferential direction of the rotor core 2; the separator 12 is in relative sliding contact sealing with the rotor inner core 2, and is in sealing contact with a corresponding structure outside the rotor inner core 2 through the separator 12, the inner cavity of the stator shell 1 is separated into a sealed cavity through the sealing contact of the separator 12 and the rotor inner core 2, the sealed cavity is independent of the stator outer air duct 5, and the two are not communicated; the gas in the closed cavity is not communicated with the outside air flow, and the heat generated in the closed cavity is taken out by circulating cooling liquid through the cooling water channel 11.
Furthermore, the inner circulation fan blades 21 are arranged on the rotor inner core 2, the inner circulation fan blades 21 are fixed on the rotor inner core 2, and the inner circulation fan blades 21 are positioned in the closed cavity; when inner circulation fan blade 21 rotates along with rotor inner core 2, make airtight chamber form the circulation air current, the air current flow path in airtight chamber is shown as the arrow of reference numeral tetra in the picture, and the air current only flows in airtight chamber, and the air current that constantly circulates makes the heat in airtight chamber constantly circulate, takes place heat exchange when being close to cooling water course 11, makes the heat in airtight chamber can faster derive, cooling efficiency with higher speed.
Furthermore, a rotor air duct 22 is axially arranged at the position of the rotor inner core 2 in the sealed cavity, an inner stator air duct 13 is axially arranged at the position of the stator housing 1 in the sealed cavity, air flow generated by the inner circulation fan blades 21 circularly flows between the inner stator air duct 13 and the rotor air duct 22, the inner stator air duct 13 and the rotor air duct 22 are both in a straight line through structure and are parallel to the rotating shaft 3, the function of guiding the air flow is achieved, the contact area of the air flow is increased, and heat dissipation is further accelerated.
The invention also provides an electric locomotive which comprises the permanent magnet motor for cooling the bearing, and the electric locomotive can achieve the same technical effect. For other structures of the electric locomotive, please refer to the prior art, and the present invention is not described herein.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The permanent magnet motor capable of cooling the bearing is characterized by comprising a stator shell (1), a rotor inner core (2) and a rotating shaft (3), wherein the rotating shaft (3) and the rotor inner core (2) are circumferentially and relatively fixed, and the rotating shaft (3) is rotatably arranged on the stator shell (1) through two groups of bearings (4);
the stator shell (1) is provided with a stator outer air duct (5), each group of bearings (4) is at least correspondingly provided with one stator outer air duct (5), two ends of each stator outer air duct (5) are respectively communicated with the outside to form an air inlet and an air outlet, and the middle part of each stator outer air duct (5) is close to the inner end part of each bearing (4);
the air inlet of the stator outer air duct (5) faces the traveling direction of the vehicle, and the air outlet faces away from the traveling direction of the vehicle; and air flow generated when the vehicle runs bypasses the rotating shaft (3) to cool the bearing (4).
2. The permanent magnet motor for cooling a bearing according to claim 1, wherein the air inlet and the air outlet of the stator outer air duct (5) are arranged on the same side of the stator housing (1);
and the part of the stator outer air duct (5) close to the air inlet and the air outlet forms an included angle with the walking direction.
3. The permanent magnet motor for cooling the bearing according to claim 2, wherein the stator outer air duct (5) comprises a linearly extending air inlet section (51) and an air outlet section (53), the air inlet section (51) and the air outlet section (53) are respectively in butt joint communication with an annular bypass section (52), and the bypass section (52) surrounds the rotating shaft (3).
4. The permanent magnet motor for cooling the bearing according to claim 3, wherein an induced draft hood (6) is installed on the outer wall of the stator housing (1), an air inlet and an air outlet of the stator outer air duct (5) correspond to one induced draft hood (6), and the induced draft hood (6) is used for guiding the air flow entering and exiting; and is capable of filtering the airflow.
5. Permanent magnet electric machine for cooling bearings according to claim 3, characterized in that cooling water channels (11) are provided in the stator housing (1), said cooling water channels (11) being used for circulating cooling water.
6. The permanent magnet motor for cooling a bearing according to any of claims 1 to 5, characterized in that a partition (12) is arranged in the stator housing (1) along the circumferential direction, the partition (12) is sealed in sliding contact with the rotor inner core (2) relatively, and a closed cavity is formed in the stator housing (1) in a partitioned manner.
7. The permanent magnet motor for cooling bearings according to claim 6, characterized in that the rotor core (2) is provided with internal circulation fan blades (21), the internal circulation fan blades (21) being located in the closed cavity; when the internal circulation fan blades (21) rotate along with the rotor inner core (2), the closed cavity forms a circulation airflow.
8. The permanent magnet motor for cooling the bearing according to claim 7, wherein a rotor air duct (22) is axially formed at the position of the rotor inner core (2) in the closed cavity, a stator inner air duct (13) is axially formed at the position of the stator housing (1) in the closed cavity, and air flow generated by the inner circulation fan blade (21) circularly flows between the stator inner air duct (13) and the rotor air duct (22).
9. An electric locomotive comprising a permanent magnet motor for cooling a bearing according to any of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111233191.2A CN113937945A (en) | 2021-10-22 | 2021-10-22 | Permanent magnet motor for cooling bearing and electric locomotive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111233191.2A CN113937945A (en) | 2021-10-22 | 2021-10-22 | Permanent magnet motor for cooling bearing and electric locomotive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113937945A true CN113937945A (en) | 2022-01-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111233191.2A Pending CN113937945A (en) | 2021-10-22 | 2021-10-22 | Permanent magnet motor for cooling bearing and electric locomotive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113937945A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115605004A (en) * | 2022-11-10 | 2023-01-13 | 湖南博匠信息科技有限公司（Cn） | Heat dissipation machine case and data transmission equipment |
| CN116961319A (en) * | 2023-09-21 | 2023-10-27 | 中达电机股份有限公司 | Permanent magnet motor rotor cooling system for vacuum pump |
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| CN115605004B (en) * | 2022-11-10 | 2023-06-06 | 湖南博匠信息科技有限公司 | Heat dissipation machine case and data transmission equipment |
| CN116961319A (en) * | 2023-09-21 | 2023-10-27 | 中达电机股份有限公司 | Permanent magnet motor rotor cooling system for vacuum pump |
| CN116961319B (en) * | 2023-09-21 | 2023-11-21 | 中达电机股份有限公司 | Permanent magnet motor rotor cooling system for vacuum pump |
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