CN217692983U - High-speed railway permanent magnet motor cooling system of thermal management enhancement - Google Patents
High-speed railway permanent magnet motor cooling system of thermal management enhancement Download PDFInfo
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- CN217692983U CN217692983U CN202122902426.4U CN202122902426U CN217692983U CN 217692983 U CN217692983 U CN 217692983U CN 202122902426 U CN202122902426 U CN 202122902426U CN 217692983 U CN217692983 U CN 217692983U
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Abstract
The utility model discloses a high-speed railway permanent magnet motor cooling system of thermal management strengthens. The motor comprises a water-cooled shell, a stator core, a stator winding, a heat pipe, a mounting hole, a cooling water channel and heat-conducting pouring sealant; a cavity is enclosed among the stator winding, the stator core and the water-cooled shell; mounting holes are formed in the two ends of the water-cooling shell and the two ends of the stator core; the heat pipe condensation section is embedded into the mounting hole of the water-cooling machine shell and contacts with the inner surface of the water-cooling machine shell; the heat pipe evaporation section extends into the mounting hole of the stator core, the cavity is filled with heat-conducting pouring sealant, and the end winding and the heat pipe are completely wrapped by the heat-conducting pouring sealant; the heat-conducting pouring sealant is filled with quartz powder so as to improve the heat conductivity of the heat-conducting pouring sealant and reduce the contact thermal resistance between the winding and the heat pipe. The utility model discloses utilize heat pipe and heat conduction casting glue, for motor stator core and winding overhang provide extra hot circuit, can eliminate the overheated problem of stator core and stator winding overhang temperature, guarantee water-cooled motor's work efficiency and life.
Description
Technical Field
The utility model relates to a high-speed railway permanent magnet traction motor cooling field, concretely relates to reinforce heat management's high-speed railway permanent magnet motor cooling system.
Background
With the improvement of the manufacturing technology of the permanent magnet motor and the development of high-performance permanent magnet materials, the motor capacity and power density are larger and larger, and the permanent magnet synchronous traction motor is gradually used in the field of rail transit and becomes a main line for the development of an alternating current transmission traction system. In order to improve the reliability of the permanent magnet motor for rail transit, the permanent magnet motor needs to be designed into a fully-closed structure. However, the permanent magnet synchronous traction motor for high-speed rail has high power density and high loss density, and the cooling condition is relatively severe due to the fully-closed structure, and the conventional natural convection cooling can not ensure that the temperature rise of key parts such as windings, rotors, permanent magnets, bearings and the like is within reasonable limit values and has reasonable temperature distribution under different working conditions of the motor. Therefore, in the contradiction between high power density and motor cooling performance, the thermal management problem of the permanent magnet motor needs to be solved urgently.
Common cooling methods of the motor include forced air cooling and shell water cooling. Forced air cooling is the most common cooling mode for medium and low power motors due to low cost and simple mechanism. However, its low convective heat dissipation efficiency limits its application in medium and high power motors. The water-cooling heat dissipation system of the machine shell has higher heat dissipation efficiency which can reach 50 times of the former heat dissipation efficiency. However, the end winding is surrounded by air, only a small portion of heat is transferred to the casing and the end cover through the air at the end of the motor in a heat convection mode, and most of heat is transferred to the iron core to the middle of the winding, so that the end part and the winding of the stator iron core both show a distribution trend of high temperature at two ends and low temperature at the middle part, and the temperature uniformity is deteriorated. In recent years, a motor heat dissipation scheme adopting heat transfer devices with high thermal conductivity such as heat conduction pouring sealant and heat pipes as an additional heat path is an effective means for solving the heat dissipation problem of key heating components of a motor, and a new idea for improving the heat dissipation efficiency of the motor is also provided.
SUMMERY OF THE UTILITY MODEL
In order to overcome that high-speed railway permanent magnet motor stator core tip and winding overhang can't obtain cooling, the difference in temperature gradient is big, the radiating effect is poor not enough etc, the utility model provides a reinforce thermal management's high-speed railway permanent magnet motor cooling system. The heat pipe and the heat conduction pouring sealant are utilized to provide an additional heat circuit for the stator core and the winding end part of the motor, and the temperature rise of the stator core and the winding end part is reduced.
The utility model aims at providing a high-speed railway permanent magnet motor cooling system of thermal management enhancement, including water-cooled housing, stator core, stator winding, heat pipe, mounting hole, cooling water course, heat conduction casting glue; the stator core is arranged on the inner wall of the water-cooling shell, and mounting holes are formed in two ends of the water-cooling shell; a plurality of heat pipes are arranged between the stator core and the water-cooled shell; the heat generated by the stator core is conducted to the inner wall of the shell through the heat pipe.
The heat conduction pouring sealant is filled in a cavity of an enclosed city among the stator core, the stator winding and the water-cooled machine shell and completely wraps the end winding and the heat pipe.
And a cooling water channel is arranged in the water-cooling shell, a cooling water inlet and a cooling water outlet are arranged on the water-cooling shell, and the axial length of the cooling water channel is greater than that of the stator winding.
The heat pipe condensation section is embedded into the mounting hole of the water cooling shell and contacts with the inner surface of the water cooling shell; the heat pipe evaporation section is assembled in a heat pipe mounting hole of the stator core.
The heat pipe is a sintered capillary liquid absorption core copper heat pipe, and the inner wall liquid absorption core is made of capillary porous materials.
The heat pipes are divided into two groups and are respectively arranged at two ends of the motor, one group of heat pipes corresponds to one containing cavity, each group of heat pipes comprises a plurality of heat pipes, the heat pipes in the same group are uniformly distributed at one end of the water cooling shell along the circumference, and the number of the mounting holes is consistent with that of the heat pipes, so that the requirement that the heat dissipation performance of the two ends of the high-speed rail permanent magnet motor is consistent is met.
Furthermore, the cross section of the mounting hole is circular or semicircular, and the cross section of the heat pipe is circular.
Furthermore, the mounting hole on the stator core is connected with the heat pipe in an expansion joint mode, and the mounting hole on the water cooling shell is connected with the heat pipe in a low-temperature welding mode.
Preferably, the outer surfaces of the condensation section and the evaporation section of the heat pipe are both provided with spiral grooves or fins.
Further preferably, in order to improve the thermal conductivity of the heat-conducting pouring sealant, the heat-conducting pouring sealant is filled with quartz powder.
Further preferably, the surface of the heat pipe is passivated to reduce the abrasion and corrosion of the shell of the heat pipe and prevent the working medium inside the heat pipe from leaking.
Further preferably, the working medium filled in the heat pipe is a refrigerant medium. The refrigerant medium should be one with high latent heat of vaporization and heat conductivity to reduce the amount of refrigerant and the volume of the heat pipe, such as deionized water.
Compared with the prior art, the utility model, following effect has:
(1) The utility model discloses a heat pipe is as heat-conducting component, and the heat pipe has high heat transfer efficiency, can strengthen the heat conduction efficiency of stator core, stator winding and water-cooled machine shell, makes and concentrates on the heat of stator winding and stator core tip rapidly to transmit, spread to whole water-cooled machine shell in originally, reduces the difference in temperature gradient of stator core and winding to eliminate the overheated problem of local temperature.
(2) The heat-conducting pouring sealant is filled with quartz powder, the quartz powder has excellent insulating property, lower price and higher thermal conductivity, is suitable for encapsulation, and can improve the thermal conductivity of the heat-conducting pouring sealant, so that the thermal contact resistance between a heat pipe and a winding is reduced.
(3) The outer surfaces of the condensation section and the evaporation section of the heat pipe fixedly sealed in the heat conduction pouring sealant part are provided with spiral grooves or fins, so that the heat exchange area can be increased, the temperature gradient can be reduced, and the enhanced heat transfer can be realized.
(4) The heat pipe has smaller radius and can be bent along any direction, so that redundant small space between the stator winding in the motor and the water-cooled machine shell can be fully utilized, the volume of the motor does not need to be additionally enlarged, and the integration of the motor and other objects is facilitated.
Drawings
FIG. 1 is a three-dimensional schematic diagram of a high-speed rail permanent magnet motor heat dissipation system with enhanced thermal management;
FIG. 2 is an assembly view of a water cooled housing and stator core of a high-speed rail permanent magnet motor heat dissipation system with enhanced thermal management;
FIG. 3 is a cross-sectional view of a high-speed rail permanent magnet motor heat dissipation system with enhanced thermal management;
FIG. 4 is an exploded view of a high-speed rail permanent magnet motor heat dissipation system with enhanced thermal management;
the reference numerals in fig. 1 to 4 illustrate:
1-water cooling the shell; 2-a stator core; 3-a stator winding; 4-a heat pipe; 5-mounting holes; 6-cooling water channel; 7-heat conducting pouring sealant; 8-rotor, 9-permanent magnet, 10-bearing
Detailed Description
The technical solution and the advantages of the present invention will be more clear and clear by further describing the specific embodiments of the present invention with reference to the drawings of the specification. The following description of the embodiments with reference to the drawings is exemplary in nature and is intended to explain the present invention, but the scope and implementations of the invention are not limited thereto.
As shown in fig. 1 to 4, the utility model provides a high-speed railway permanent magnet motor cooling system of thermal management is reinforceed, including water-cooled casing 1, stator core 2, stator winding 3, heat pipe 4, mounting hole 5, cooling water course 6, heat conduction casting glue 7, rotor 8, permanent magnet 9, bearing 10.
The three-dimensional schematic diagram of the high-speed rail permanent magnet motor heat dissipation system is shown in fig. 1; a cooling water channel 7 is arranged in the water-cooling machine shell 1, a cooling water channel 6 in the water-cooling machine shell 1 is provided with a cooling liquid inlet and a cooling liquid outlet, and the axial length of the cooling water channel 6 is greater than that of the stator winding 3; mounting holes 5 are formed in two ends of the water-cooled machine shell 1, the heat pipes 4 are divided into two groups and are arranged at two ends of the motor in a split mode, one group of heat pipes corresponds to one containing cavity, each group of heat pipes comprises a plurality of heat pipes 4, and the heat pipes 4 in the same group are uniformly distributed at one end of the water-cooled machine shell 1 along the circumference, the number of the mounting holes 5 is consistent with the number of the heat pipes 4, so that the requirement that the heat dissipation performance of the two ends of the high-speed permanent magnet motor is consistent is met.
The stator core 2 is arranged in the water-cooling machine shell 1, and the peripheral surface of the stator core 2 is contacted with the inner wall of the water-cooling machine shell 1.
The length of the stator core 2 is shorter than that of the stator winding 3 and the water-cooled machine shell 1, so that an annular cavity is enclosed among the stator core, the stator winding and the water-cooled machine shell.
The heat pipe 4 is a sintered capillary wick copper heat pipe; the condensation section of the heat pipe 4 is embedded into the mounting hole 5 of the water-cooling shell 1 and is contacted with the inner surface of the water-cooling shell 1; the evaporation section of the heat pipe 4 extends into the mounting hole 5 of the stator core 2, the cavity is filled with heat-conducting pouring sealant 7, and the end winding 3 and the heat pipe 4 are completely wrapped by the heat-conducting pouring sealant 7.
The surface of the heat pipe 4 is passivated to reduce the abrasion and corrosion of the shell of the heat pipe 4 and prevent the working medium inside the heat pipe 4 from leaking.
The outer surfaces of the condensation section of the heat pipe 4 and the evaporation section wrapped on the heat conduction pouring sealant 7 are provided with spiral grooves or fins.
The heat-conducting pouring sealant 7 is filled with quartz powder, the quartz powder has excellent insulating property, low price and high heat conductivity, is suitable for potting and can improve the heat conductivity of the heat-conducting pouring sealant, so that the thermal contact resistance between a heat pipe and a winding is reduced.
The cross section of the mounting hole 5 is circular or semicircular; the section of the heat pipe 4 is circular, the diameter of the heat pipe can be reasonably designed according to the iron loss and the torque of the motor, and the working medium filled in the heat pipe 4 is a refrigerant medium, such as deionized water.
Furthermore, in order to reduce the thermal contact resistance between the heat pipe 4 and the stator core 2 and the water-cooling machine shell 1, the mounting hole 5 on the stator core 2 is connected with the heat pipe 4 in an expansion manner; the mounting hole 5 on the water-cooling machine shell 1 is connected with the heat pipe 4 by low-temperature welding.
In order to ensure that the refrigerant in the heat pipe 4 can be normally evaporated and condensed, the boiling point of the refrigerant is higher than the cooling water temperature in the water-cooled machine shell 1 and lower than the temperature of the stator core 2 at the evaporation section of the heat pipe 4. For example, when the selected refrigerant medium is deionized water, the internal pressure of the heat pipe 4 may be about 38kpa, and the boiling point of the refrigerant medium is 75 ℃ at this time, which is lower than the steady-state temperature of the motor stator core 2 during operation.
The distance between the heating section of the heat pipe 4 and the stator winding 3 needs to be kept between 2 mm and 3mm to ensure the insulation requirement of the motor.
The cooling method of the motor comprises the following steps:
in the working process of the motor, the temperature in the motor rises, heat generated by the stator core 2 and the stator winding 3 is transmitted into the heat pipe 4 through the heat conduction pouring sealant 7, a medium in the heat pipe 4 absorbs the heat in the evaporation section and evaporates, steam is formed and flows to the condensation section, the steam is condensed into liquid in the condensation section and transmits latent heat to the water-cooled shell 1, the condensed liquid flows back to the evaporation section again by virtue of the capillary force of the liquid absorption core to absorb the heat again and evaporate, and the process is circulated.
The heat-conducting pouring sealant 7 is filled with quartz powder, and the higher thermal conductivity of the quartz powder can improve the thermal conductivity of the heat-conducting pouring sealant 7, so that the thermal contact resistance between the heat pipe and the winding is reduced.
This embodiment water cooled machine through utilizing heat pipe and heat conduction casting glue, provides extra hot circuit for motor stator core and winding overhang, eliminates stator core and the overheated problem of stator winding overhang temperature, has guaranteed water cooled machine's work efficiency and life.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention are equivalent replacement modes, and are all included in the scope of the present invention.
Claims (5)
1. A high-speed rail permanent magnet motor heat dissipation system for enhancing heat management comprises a water cooling machine shell, a heat pipe, a cooling water channel and heat conduction pouring sealant, wherein the cooling water channel is arranged in the water cooling machine shell; enclose into between stator winding, stator core, the water-cooled casing and hold the chamber, its characterized in that: mounting holes are formed in the two ends of the water-cooling shell and the two ends of the stator iron core; the heat pipe comprises a heat pipe condensation section and a heat pipe evaporation section; the heat pipe condensation section is assembled in the mounting hole of the water-cooling shell; the heat pipe evaporation section extends into the mounting hole of the stator core, the cavity is filled with heat conduction pouring sealant, and the end winding and the heat pipe are completely wrapped by the heat conduction pouring sealant.
2. The high-speed rail permanent magnet motor heat dissipation system for enhanced thermal management of claim 1, wherein: the heat pipes are divided into two groups and are arranged at two ends of the motor in a separated mode, one group of heat pipes corresponds to one containing cavity, each group of heat pipes comprises a plurality of heat pipes, and the heat pipes in the same group are uniformly distributed at one end of the water cooling shell along the circumference so as to meet the requirement that the heat dissipation performance of two ends of the high-speed rail permanent magnet motor is consistent.
3. The high-speed rail permanent magnet motor heat dissipation system for enhanced thermal management of claim 1, wherein: the heat pipe condensation section is assembled in the mounting hole of the water-cooling shell and is contacted with the inner surface of the water-cooling shell; the heat pipe evaporation section is assembled in a heat pipe mounting hole of the stator core.
4. The high-speed rail permanent magnet motor heat dissipation system for enhanced thermal management of claim 1, wherein: and quartz powder is filled in the heat-conducting pouring sealant and completely wraps the end winding and the heat pipe.
5. The enhanced thermal management high-speed rail permanent magnet motor heat dissipation system of any of claims 1 to 4, wherein: the heat pipe is fixedly sealed on the outer surface of the part of the heat conduction pouring sealant, and a spiral groove or a fin is arranged on the outer surface of the part of the heat conduction pouring sealant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122902426.4U CN217692983U (en) | 2021-11-24 | 2021-11-24 | High-speed railway permanent magnet motor cooling system of thermal management enhancement |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122902426.4U CN217692983U (en) | 2021-11-24 | 2021-11-24 | High-speed railway permanent magnet motor cooling system of thermal management enhancement |
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| CN217692983U true CN217692983U (en) | 2022-10-28 |
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| CN202122902426.4U Active CN217692983U (en) | 2021-11-24 | 2021-11-24 | High-speed railway permanent magnet motor cooling system of thermal management enhancement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116094200A (en) * | 2023-04-10 | 2023-05-09 | 湖南大学 | Heat dissipation stator structure based on gravity type micro heat pipe array |
| CN116111748A (en) * | 2023-04-10 | 2023-05-12 | 湖南大学 | Reinforced synchronous heat dissipation stator structure |
| WO2024139350A1 (en) * | 2022-12-28 | 2024-07-04 | 广州汽车集团股份有限公司 | Electric motor and production method for heat dissipation member |
-
2021
- 2021-11-24 CN CN202122902426.4U patent/CN217692983U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024139350A1 (en) * | 2022-12-28 | 2024-07-04 | 广州汽车集团股份有限公司 | Electric motor and production method for heat dissipation member |
| CN116094200A (en) * | 2023-04-10 | 2023-05-09 | 湖南大学 | Heat dissipation stator structure based on gravity type micro heat pipe array |
| CN116111748A (en) * | 2023-04-10 | 2023-05-12 | 湖南大学 | Reinforced synchronous heat dissipation stator structure |
| CN116094200B (en) * | 2023-04-10 | 2023-12-05 | 湖南大学 | Heat dissipation stator structure based on gravity type micro heat pipe array |
| CN116111748B (en) * | 2023-04-10 | 2024-02-13 | 湖南大学 | Reinforced synchronous heat dissipation stator structure |
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