CN110784069A - Motor stator core cooling structure based on gas-liquid phase change, stator core, motor and motor cooling method - Google Patents
Motor stator core cooling structure based on gas-liquid phase change, stator core, motor and motor cooling method Download PDFInfo
- Publication number
- CN110784069A CN110784069A CN201910913002.2A CN201910913002A CN110784069A CN 110784069 A CN110784069 A CN 110784069A CN 201910913002 A CN201910913002 A CN 201910913002A CN 110784069 A CN110784069 A CN 110784069A
- Authority
- CN
- China
- Prior art keywords
- stator core
- motor
- phase change
- circumferential heat
- gas
- 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
- 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
- H02K9/20—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil wherein the cooling medium vaporises within the machine casing
Abstract
The invention discloses a gas-liquid phase change-based motor stator core cooling structure, a stator core, a motor and a motor cooling method. The quantity of circumference heat pipe is a plurality of, encircles inside the stator core body, along the axial evenly distributed of stator core body. The axial communicating device is one, is arranged below the inner part of the stator core body and is intersected with all the circumferential heat pipes. The evaporation condensing device is arranged above the motor base, and the circumferential heat pipe is communicated to the evaporation condensing device. The circumferential heat pipe and the axial communicating vessel jointly form a working pipeline, and phase-change working media with certain mass and pressure are filled in the working pipeline. According to the invention, heat in the motor stator is transferred to the outside of the motor through gas-liquid phase change of the phase change working medium, so that the problems of uneven temperature and overhigh temperature caused by insufficient heat dissipation of the motor stator can be effectively solved, and the service life and the efficiency of the motor are improved.
Description
Technical Field
The invention relates to the field of motor cooling, in particular to a motor stator core cooling structure based on gas-liquid phase change, a stator core, a motor and a motor cooling method.
Background
The motor converts electric energy into mechanical energy according to the electromagnetic induction law, and can provide power sources for electrical appliances or various machines. In the running process of the motor, various losses are inevitably generated, most of the losses are finally converted into heat energy, so that the temperature of the motor is increased, the efficiency of the motor is reduced, and even the motor is damaged.
The motor cooling mode commonly adopted at present is to carry out ventilation cooling by the cooperation of a cooling fin on a motor base and a fan driven by a motor spindle, and has the advantages of simple structure and easy processing. However, the specific heat of the air is low, forced convection assistance of a fan is required, the cooling efficiency is low, and the problems of backflow, vortex and the like of the air in the motor are easy to occur, so that the cooling efficiency is seriously influenced. The method for absorbing heat by utilizing the gas-liquid phase change of fluid is a very effective cooling mode, and Chinese patent CN107070062A discloses a motor phase change cooling system, wherein a plurality of independent heat pipes are arranged in a motor stator to absorb the heat of the stator, and the working medium in the heat pipes is water. In this patent only simply insert the stator with the heat pipe, utilize the heat of water evaporation absorption stator, reuse outside condenser with its condensation, do not consider back liquid distribution problem, can cause the uneven problem of each heat pipe liquid return distribution, can only reach local refrigerated effect. Chinese patent CN206619966U discloses a phase change cooling device applied to heat dissipation of large motor stator, which is cooled by arranging axial and circumferential heat pipes on the stator core of the motor, but the patent does not mention how to condense the working medium gas of the heat pipes into liquid. In addition, the liquid is conveyed to the heat absorption section by the aid of the heat absorption core, conveying speed is difficult to guarantee, the heat absorption core influences heat absorption rate of working media of the heat pipe, and cooling effect is reduced. Chinese patent CN 107465304A discloses a motor phase transition cooling system, this scheme forms duty cycle through the condenser that sets up axial working medium evaporation zone and motor outside on stator core, but the pipeline that this patent gaseous state and liquid working medium passed through is one, and each evaporation zone does not realize the intercommunication, can lead to the work medium to flow poorly in practical application, the cooling effect is poor, and one side that is close to the stator condensation zone is better for the opposite side effect, can arouse that the inside axial temperature is uneven along of motor, because the shearing stress that expend with heat and contract with cold produced influences the normal work of motor, structural strength and life.
Disclosure of Invention
The invention aims to provide a motor stator core cooling structure based on gas-liquid phase change, a stator core, a motor and a motor cooling method, and aims to solve the problems that in the prior art, the motor stator core cooling effect is poor and the heat dissipation efficiency is not high.
The purpose of the invention is realized by the following technical scheme:
a motor stator core cooling structure based on gas-liquid phase change comprises an axial communicating vessel, a plurality of circumferential heat pipes and an evaporative condensing device, wherein the circumferential heat pipes surround the inside of a stator core body of a motor stator; the evaporation and condensation device is arranged at a position opposite to the axial communicating vessel and is communicated with all the circumferential heat pipes; phase change working media are added in the axial communicating vessel and the circumferential heat pipe.
The shape of circumference heat pipe is the annular, and inside stator core body was located to circumference heat pipe cover.
The axial communicating vessel comprises a plurality of sections of first communicating pipes, and adjacent circumferential heat pipes are communicated through the first communicating pipes.
The evaporation condensing device is respectively communicated with each circumferential heat pipe through a plurality of second communicating pipes, and the connecting point of the second communicating pipes and the circumferential heat pipes is opposite to the connecting point of the axial communicating device and the circumferential heat pipes.
A stator core has above-mentioned motor stator core cooling structure based on gas-liquid phase change.
The axial communicating vessel is positioned at the lower part of the stator core body, and the evaporation and condensation device is arranged above the stator core body.
And the plurality of circumferential heat pipes are uniformly distributed along the axial direction of the stator core body.
An electric machine having the above stator core.
The evaporation and condensation device is arranged above the motor base.
The cooling method of the motor comprises the following steps:
in the working process of the motor, the temperature in the motor rises, and the phase change working medium absorbs the heat of the stator in the circumferential heat pipe and changes from a liquid state to a gas state; gaseous phase-change working media enter the evaporation condensing device by virtue of the buoyancy lift force, are condensed into liquid, and then enter the circumferential heat pipe by virtue of gravity to absorb heat of the stator;
when temperature difference exists between the circumferential heat pipes, the gaseous phase change working medium is driven to flow from the high-temperature part to the low-temperature part through the density difference of the phase change working medium and the axial communicating device, so that the temperatures of all the circumferential heat pipes are consistent, and the temperature of the stator is kept consistent.
Compared with the prior art, the invention has the following beneficial effects:
according to the motor stator core cooling structure based on gas-liquid phase change, the plurality of circumferential heat pipes are distributed at intervals along the axial direction of the stator core body, and the plurality of circumferential heat pipes are communicated through the axial communicating device. When the motor stator core cooling structure based on gas-liquid phase change cools the stator core body, the phase change working medium absorbs the heat of the stator in the circumferential heat pipe and changes from liquid state to gas state; gaseous phase-change working media enter the evaporation condensing device by virtue of the buoyancy lift force and are condensed into liquid, and then enter the circumferential heat pipe by virtue of gravity to absorb heat of the stator. The phase change working medium is in a gas-liquid phase balance state in the circumferential heat pipes, and the air flow is caused to flow from a high-temperature part to a low-temperature part by virtue of density difference, so that the temperature of all the circumferential heat pipes is ensured to be consistent, the temperature of the stator is kept consistent, and the phenomenon of heat accumulation at a certain part of the stator is avoided. Therefore, the cooling structure of the motor stator core based on the gas-liquid phase change can effectively control the temperature of each part of the motor stator, has good cooling effect and high heat dissipation efficiency, and solves the problems of motor efficiency reduction and equipment damage caused by high-temperature hot spots. In addition, the heat transportation process of the motor stator core cooling structure based on gas-liquid phase change is completed through self-driven circulation of the density difference of the phase change working medium, no additional power is required, the cooling effect is obvious, and energy is saved.
The stator core has the cooling structure, so that when the stator core works, the temperature of the stator core body tends to be uniform, the phenomenon of heat accumulation at a certain part of the stator is avoided, and the problems of motor efficiency reduction and equipment damage caused by high-temperature hot spots are solved.
The motor provided by the invention is provided with the stator core, so that the problems of motor efficiency reduction and equipment damage caused by high-temperature hot spots of the stator can be avoided when the motor works.
The motor stator core cooling structure based on gas-liquid phase change, the stator core and the motor have the advantages that the motor cooling method can avoid the conditions of motor efficiency reduction and equipment damage, extra power does not need to be provided, and the motor stator core cooling structure has the advantage of energy conservation.
Drawings
FIG. 1 is a schematic diagram of a stator core cooling structure based on gas-liquid phase change.
In the figure: 1. the device comprises an evaporation condensing device, 2, a stator core body, 3, a circumferential heat pipe, 4, an axial communicating vessel, 4-1-a first communicating pipe and 5-a second communicating pipe.
Detailed Description
In order to further explain the technical scheme of the invention, the invention is explained in detail by the specific implementation case.
Referring to fig. 1, the motor stator core cooling structure based on gas-liquid phase change comprises an axial communicating vessel 4, a plurality of circumferential heat pipes 3 and an evaporative condensing device 1, wherein the circumferential heat pipes 3 surround the inside of a stator core body 2 of a motor stator, the circumferential heat pipes 3 are distributed at intervals along the axial direction of the stator core body 2, and the circumferential heat pipes 3 are communicated with each other through the axial communicating vessel 4; the evaporation and condensation device 1 is arranged at a position opposite to the axial communicating vessel 4, and the evaporation and condensation device 1 is communicated with all the circumferential heat pipes 3; the axial communicating vessel 4 and the circumferential heat pipe 3 jointly form a working pipeline, and a phase change working medium with certain mass and pressure is added into the working pipeline.
As a preferred embodiment of the present invention, the shape of the circumferential heat pipe 3 is annular, and the circumferential heat pipe 3 is sleeved inside the stator core body 2.
As a preferred embodiment of the invention, the axial communicating vessel 4 comprises a plurality of sections of first communicating pipes 4-1, and adjacent circumferential heat pipes 3 are communicated through the first communicating pipes 4-1.
As a preferred embodiment of the present invention, the evaporative condensing unit 1 is respectively communicated with each circumferential heat pipe 3 through a plurality of second communicating pipes 5, and a connection point of the second communicating pipe 5 and the circumferential heat pipe 3 is directly opposite to a connection point of the axial communicator 4 and the circumferential heat pipe 3.
As a preferred embodiment of the invention, the phase change working medium has higher latent heat of vaporization, heat conductivity coefficient and smaller density, so as to reduce the using amount of the phase change working medium and the volume of the heat pipe. The phase change working medium can be selected according to the cooling temperature of the motor, the phase change working medium is in a gas-liquid phase equilibrium state in the heat pipe when the motor works, and the saturation pressure of the phase change working medium is close to the atmospheric pressure at the temperature of the stator.
The stator core of the invention has the cooling structure of the stator core of the motor based on the gas-liquid phase change, wherein the axial communicating vessel 4 is positioned at the lower part of the stator core body 2, and the evaporative condensing device 1 is arranged above the stator core body 2.
As a preferred embodiment of the present invention, a plurality of circumferential heat pipes 3 are uniformly distributed along the axial direction of the stator core body 2.
As a preferred embodiment of the present invention, the outer wall of the circumferential heat pipe 3 is integrally formed with the stator core body 2.
The motor of the present invention has the stator core of the present invention described above.
As a preferred embodiment of the invention, the evaporative condensing unit 1 is disposed above the motor housing.
As the preferred embodiment of the invention, the base of the motor is provided with an interface and a fixing device for connecting the circumferential heat pipe 3 and the evaporative condensing device 1.
As a preferred embodiment of the invention, the structure of the evaporative condensing unit 1 can be selected according to the cooling requirement of the motor, and air cooling or liquid cooling can be adopted.
The cooling method of the motor comprises the following steps:
in the working process of the motor, the temperature in the motor rises, and the phase change working medium absorbs the heat of the stator in the circumferential heat pipe 3 and changes from a liquid state to a gas state; gaseous phase-change working media enter the evaporative condensing device 1 by virtue of the buoyancy lift force, are condensed into liquid by virtue of the evaporative condensing device 1, and then enter the circumferential heat pipe 3 by virtue of gravity to absorb heat of the stator; the phase-change working medium is in a gas-liquid phase equilibrium state in the circumferential heat pipe;
when the temperature difference exists between the circumferential heat pipes 3, the gaseous phase change working medium is driven to flow from the high-temperature part to the low-temperature part through the density difference of the phase change working medium and the axial communicating vessel 4, so that the temperatures of all the circumferential heat pipes 3 are consistent, the temperature of the stator is kept consistent, and the phenomenon of heat accumulation at a certain part of the stator is avoided.
Examples
The motor of the embodiment comprises a stator core, an axial communicating vessel 4, a circumferential heat pipe 3 and an evaporative condensing device 1, wherein the circumferential heat pipe 3 is surrounded inside a stator core body 2; the axial communicating vessel 4 is arranged below the inside of the stator core body 2 and connected with all the circumferential heat pipes 3, so that the problem of uneven heat dissipation caused by different liquid level heights in the heat pipes due to the fact that heat is unevenly distributed and the motor is inclined is solved. The evaporation condensing device 1 is arranged above the motor base, and all the circumferential heat pipes 3 are communicated to the evaporation condensing device 1. The circumferential heat pipe 3 and the axial communicating vessel 4 jointly form a working pipeline, and the inside of the working pipeline contains a phase change working medium. The diameters of the plurality of circumferential heat pipes 3 are completely consistent and are uniformly distributed along the axial direction of the stator core body 2. And a base of the motor is provided with an interface and a fixing device for connecting the circumferential heat pipe and the evaporation and condensation device 1. In this embodiment, the phase change working medium selected in the working pipeline formed by the circumferential heat pipe 3 and the axial communicating vessel 4 is R1233zd (E), the internal pressure of the heat pipe is 0.3MPa, and the boiling point of the phase change working medium is 50 ℃ at this time, which is lower than the steady-state temperature of the motor stator core body 2 during working. In the working process of the motor, the internal temperature of the motor rises, so that the liquid phase change working medium in the circumferential heat pipes 3 is evaporated and absorbs heat, the generated gaseous phase change working medium moves to the evaporation condensing device 1 outside the motor base through the buoyancy force, the gaseous phase change working medium is liquefied and released in the evaporation condensing device 1, the generated liquid phase change working medium returns to the circumferential heat pipes 3 in the stator core body 2 through gravity, and meanwhile, the amount of the liquid phase change working medium in each circumferential heat pipe 3 is coordinated through the axial communicating device 4, so that the cooling capacity of each circumferential heat pipe 3 is kept consistent and normal work is maintained. The circulation work is carried out, the heat in the motor is quickly converted to the outside of the motor, and the purpose of efficient heat dissipation and cooling is achieved. In the embodiment, the heat transportation process is completed through the self-driven circulation of the density difference of the phase change working medium, no power supply is required to be additionally provided, the phase change working medium is not required to be introduced again after the motor is assembled, and the energy conservation and the environmental protection are realized.
In conclusion, the heat pipe heat dissipation device effectively improves the heat dissipation efficiency of the motor and avoids the problems of short service life, low efficiency and the like of the motor caused by uneven and overhigh internal temperature of the motor by reasonably arranging the arrangement mode of the heat pipes and selecting the phase change working medium.
It should be noted that: although the present invention has been described with reference to the embodiments, it will be understood by those skilled in the art that various changes in the embodiments and modifications thereof may be made, and equivalents may be substituted for elements thereof without departing from the scope of the present invention.
Claims (10)
1. A motor stator core cooling structure based on gas-liquid phase change is characterized by comprising an axial communicating vessel (4), a plurality of circumferential heat pipes (3) and an evaporation condensing device (1), wherein the circumferential heat pipes (3) surround the inside of a stator core body (2) of a motor stator, the circumferential heat pipes (3) are distributed along the stator core body (2) at intervals in the axial direction, and the circumferential heat pipes (3) are communicated with one another through the axial communicating vessel (4); the evaporation and condensation device (1) is arranged at a position opposite to the axial communicating vessel (4), and the evaporation and condensation device (1) is communicated with all the circumferential heat pipes (3); phase change working media are added in the axial communicating vessel (4) and the circumferential heat pipe (3).
2. The cooling structure for the stator core of the motor based on the gas-liquid phase change is characterized in that the shape of the circumferential heat pipe (3) is annular, and the circumferential heat pipe (3) is sleeved inside the stator core body (2).
3. The motor stator core cooling structure based on gas-liquid phase change is characterized in that the axial communicating vessel (4) comprises a plurality of sections of first communicating pipes (4-1), and adjacent circumferential heat pipes (3) are communicated through the first communicating pipes (4-1).
4. The motor stator core cooling structure based on the gas-liquid phase change is characterized in that the evaporative condensing device (1) is respectively communicated with each circumferential heat pipe (3) through a plurality of second communicating pipes (5), and the connecting points of the second communicating pipes (5) and the circumferential heat pipes (3) are opposite to the connecting points of the axial communicating device (4) and the circumferential heat pipes (3).
5. A stator core having the gas-liquid phase change based motor stator core cooling structure of any one of claims 1 to 4.
6. Stator core according to claim 5, characterized in that the axial communicator (4) is located in the lower part of the stator core body (2) and that the evaporative condensing unit (1) is arranged above the stator core body (2).
7. The stator core according to claim 5, characterized in that several circumferential heat pipes (3) are evenly distributed axially along the stator core body (2).
8. An electrical machine having a stator core as claimed in any one of claims 5 to 7.
9. The machine according to claim 8, characterized in that the evaporative condensing unit (1) is arranged above the machine base.
10. A cooling method of an electric machine according to claim 8 or 9, characterized by comprising the process of:
in the working process of the motor, the temperature in the motor is increased, and the phase change working medium absorbs the heat of the stator in the circumferential heat pipe (3) and is changed from a liquid state to a gas state; gaseous phase-change working media enter the evaporation condensing device (1) by virtue of the buoyancy lift force and are condensed into liquid, and then enter the circumferential heat pipe (3) by virtue of gravity to absorb the heat of the stator;
when temperature difference exists between the circumferential heat pipes (3), the gaseous phase change working medium is driven to flow from the high-temperature part to the low-temperature part through the density difference of the phase change working medium and the axial communicating vessel (4), so that the temperatures of all the circumferential heat pipes (3) are consistent, and the temperature of the stator is kept consistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910913002.2A CN110784069A (en) | 2019-09-25 | 2019-09-25 | Motor stator core cooling structure based on gas-liquid phase change, stator core, motor and motor cooling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910913002.2A CN110784069A (en) | 2019-09-25 | 2019-09-25 | Motor stator core cooling structure based on gas-liquid phase change, stator core, motor and motor cooling method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110784069A true CN110784069A (en) | 2020-02-11 |
Family
ID=69384434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910913002.2A Pending CN110784069A (en) | 2019-09-25 | 2019-09-25 | Motor stator core cooling structure based on gas-liquid phase change, stator core, motor and motor cooling method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110784069A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112531977A (en) * | 2020-11-27 | 2021-03-19 | 中车大连机车研究所有限公司 | Rail transit vehicle traction motor walking wind phase change heat dissipation system |
| US11804754B2 (en) | 2020-12-18 | 2023-10-31 | Hamilton Sundstrand Corporation | Two-phase thermal management system with active control for high density electric machine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005043727A1 (en) * | 2003-10-31 | 2005-05-12 | Telma | Electromagnetic retarders comprising heat dissipating elements |
| CN106787451A (en) * | 2016-12-14 | 2017-05-31 | 江苏大学 | A kind of pump motor cooling denoising device based on pulsating heat pipe |
| CN107070022A (en) * | 2017-04-26 | 2017-08-18 | 哈尔滨工程大学 | A kind of phase-change cooling device radiated applied to large-size machine stator |
| CN110233545A (en) * | 2019-06-21 | 2019-09-13 | 扬州大学 | A kind of multiple stators motor cooling heat radiator |
-
2019
- 2019-09-25 CN CN201910913002.2A patent/CN110784069A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005043727A1 (en) * | 2003-10-31 | 2005-05-12 | Telma | Electromagnetic retarders comprising heat dissipating elements |
| CN106787451A (en) * | 2016-12-14 | 2017-05-31 | 江苏大学 | A kind of pump motor cooling denoising device based on pulsating heat pipe |
| CN107070022A (en) * | 2017-04-26 | 2017-08-18 | 哈尔滨工程大学 | A kind of phase-change cooling device radiated applied to large-size machine stator |
| CN110233545A (en) * | 2019-06-21 | 2019-09-13 | 扬州大学 | A kind of multiple stators motor cooling heat radiator |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112531977A (en) * | 2020-11-27 | 2021-03-19 | 中车大连机车研究所有限公司 | Rail transit vehicle traction motor walking wind phase change heat dissipation system |
| CN112531977B (en) * | 2020-11-27 | 2023-11-03 | 中车大连机车研究所有限公司 | Track traffic vehicle traction motor running wind phase change heat dissipation system |
| US11804754B2 (en) | 2020-12-18 | 2023-10-31 | Hamilton Sundstrand Corporation | Two-phase thermal management system with active control for high density electric machine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202129679U (en) | High-speed electric main shaft cooling device for lowering temperature of cooling water through semiconductor refrigeration technology | |
| CN108882654B (en) | Phase change cooling system, cooling system and converter cabinet cooling system | |
| CN104595056B (en) | Cold end heat exchanger of free piston type Stirling engine | |
| CN103928216A (en) | Heat Exchange Type Cooling Apparatus For A Transformer | |
| CN103424018A (en) | Liquid phase-change heat transfer type pumping cooling system with booster pump | |
| CN110784069A (en) | Motor stator core cooling structure based on gas-liquid phase change, stator core, motor and motor cooling method | |
| CN110456893A (en) | A kind of cooling cabinet of enhanced immersion type | |
| CN111988965B (en) | High-heating electronic equipment immersion type phase change cooling cabinet | |
| CN104185324A (en) | Closed circulating heat radiation system of electromagnetic heating device | |
| CN102255430A (en) | Superconductive radiating motor | |
| CN219889932U (en) | Heat radiating device and refrigerator | |
| CN202216595U (en) | Liquid pump driving heat pipe cooling device for natural cooling | |
| CN101793293B (en) | Cooling structure of sliding bearing | |
| CN207939940U (en) | A kind of container to be radiated using super heat-conductive pipe | |
| CN111397413B (en) | Loop heat pipe heat accumulator | |
| CN215419967U (en) | Heat dissipation structure for flywheel energy storage unit | |
| CN202106240U (en) | Comprehensive cooling device of high-speed electric spindle | |
| CN116191707A (en) | Oil cooling heat radiation structure | |
| CN206379245U (en) | A kind of cooling structure of new oil-immersed power transformer | |
| CN201204786Y (en) | Liquid cooling radiating device | |
| CN202158687U (en) | Externally heat-exchanged high-efficient absorption refrigerator | |
| CN116014985A (en) | Additional hot path enhanced cooling structure of high-speed rail permanent magnet motor based on heat pipe | |
| CN114320787A (en) | Wind driven generator integrated cooling system adopting heat pipe for cooling | |
| CN103280926A (en) | Clamping stator evaporative cooling device | |
| CN112491181A (en) | Inner rotor motor cooling structure |
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: 20200211 |
|
| RJ01 | Rejection of invention patent application after publication |