A stator core cooling structure and motor cooling system

Abstract

The present invention discloses a stator core cooling structure and a motor cooling system, wherein the stator core cooling structure comprises a stator core and a motor housing; a plurality of axial grooves are distributed on the outer circumference of the stator core and / or the inner circumference of the motor housing, and the axial grooves extend in the axial direction of the stator core and / or the motor housing; the stator core is assembled in the motor housing, and a coolant channel is formed between the stator core and the motor housing through the axial grooves, so that the coolant cools the stator core through the coolant channel. In the stator core cooling structure of the present application, the oil can directly contact and cool the stator core through the cooling channel formed between the stator core and the motor housing, with a large contact area and high cooling efficiency. In addition, the axial grooves on the stator core in the present application are stamped and formed, and the stator core cooling structure is simple, which solves the problems of long processing cycle, high manufacturing cost, and complicated assembly process in the prior art for grooving the inner wall of the housing.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator core cooling structure and a motor cooling system. Background Art

[0002] At present, with the continuous development of industry, performance requirements such as high precision and high power density are put forward for motors, which brings about serious problems of motor heating. The heat of the motor cannot be dissipated by natural heat dissipation, and external forced cooling is required.

[0003] The existing method of cooling the inside of the motor is to set up a cooling oil circuit by slotting the inner wall of the motor housing. However, the setting of this cooling oil circuit cannot directly cool the stator core, and the slotting of the inner wall of the motor housing has problems such as long processing cycle, high manufacturing cost, and complicated assembly process. Summary of the invention

[0004] In view of the existing technical problems, a stator core cooling structure and a motor cooling system of the present invention are proposed to solve or partially solve the above technical problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] According to one aspect of the present invention, a stator core cooling structure is provided, the stator core cooling structure comprising a stator core and a motor housing;

[0007] A plurality of axial grooves are distributed on the outer circumference of the stator core and / or the inner circumference of the motor housing, and the axial grooves extend in the axial direction of the stator core and / or the motor housing;

[0008] The stator core is assembled in the motor housing, and a coolant channel is formed between the stator core and the motor housing through the axial groove.

[0009] Furthermore, an annular liquid separation groove is provided on the inner wall of the motor housing, and the coolant is distributed into each of the coolant channels through the liquid separation groove.

[0010] Furthermore, the stator core is composed of a plurality of stator punching sheets, and the stator punching sheets are formed by stamping.

[0011] According to one aspect of the present invention, a motor cooling system is provided, the motor cooling system comprising a liquid inlet, a liquid inlet channel, a liquid separation channel, a stator core cooling structure as described in any one of the above items, and a liquid outlet;

[0012] The liquid inlet is arranged at the upper part of the motor housing, and is connected to the stator core cooling structure through the liquid inlet channel and the liquid separation channel arranged in the motor housing. The liquid outlet is arranged at the lower part of the motor front end cover and / or the motor rear end cover and / or the lower end of the motor housing.

[0013] Further, the liquid inlet channel and the liquid separation channel are arranged at the upper part of the motor housing, wherein the liquid separation channel is communicated with the liquid inlet channel;

[0014] The liquid separation channel includes a main channel extending in the axial direction at the upper part of the motor housing and a stator core cooling channel extending downward from the main channel.

[0015] Furthermore, there are two main channels, which can be symmetrically arranged on both sides of the vertical center line of the motor housing.

[0016] Furthermore, the motor cooling system further comprises a winding cooling structure, and the winding cooling structure is communicated with the main channel;

[0017] The liquid separation channel also includes a first winding cooling channel and a second winding cooling channel extending downward from the main channel respectively;

[0018] The winding cooling structure comprises a first cooling groove and a second cooling groove, the first cooling groove is communicated with the first winding cooling channel, and the second cooling groove is communicated with the second cooling channel;

[0019] The first cooling groove and the second cooling groove are annular and are respectively arranged on the inner wall of the motor housing, and the first cooling groove corresponds to the front end winding of the motor, and the second cooling groove corresponds to the rear end winding of the motor.

[0020] Furthermore, arc-shaped baffles are respectively provided inside the front end cover of the motor and the rear end cover of the motor, and the first cooling groove and the second cooling groove are respectively assembled with the arc-shaped baffles to form annular channels, and a liquid spray nozzle is provided at the bottom of each annular channel.

[0021] Furthermore, the motor cooling system further comprises a bearing lubrication structure, and the bearing lubrication structure is communicated with the main channel;

[0022] The liquid separation channel also includes a bearing lubrication channel arranged inside the motor front end cover and the motor rear end cover;

[0023] The bearing lubrication structure includes the liquid collecting tank located at the upper part of the bearing chamber in the front end cover and the rear end cover of the motor, the liquid collecting tank is connected with the bearing lubrication channel, and the lower end of the liquid collecting tank corresponds to the motor bearing.

[0024] Furthermore, a drainage groove is provided at the lower part of the bearing chamber or the lower part of the installation position of the rotary transformer stator, and the drainage groove is connected to the liquid outlet.

[0025] In summary, the beneficial effects of the present invention are:

[0026] In the stator core cooling structure of the present application, axial grooves are provided on the outer circumference of the stator core and / or the inner circumference of the motor housing. When the stator core is assembled in the motor housing, a coolant channel is formed between the stator core and the motor housing, thereby enabling direct contact cooling of the stator core by the oil, resulting in a large contact area and high cooling efficiency.

[0027] In the present application, the axial grooves on the stator core are stamped and formed, and the stator core cooling structure is simple, which solves the problems of long processing cycle, high manufacturing cost, and complicated assembly process of grooving the inner wall of the shell in the prior art; the motor cooling system in the present application can simultaneously realize the cooling of the stator core, motor windings and motor bearings, and the lubrication of the motor bearings, and the motor cooling system has a compact structure and good cooling and lubrication effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of a stator core in one embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the structure of a motor housing in one embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of assembling the stator core and the motor housing in one embodiment of the present invention;

[0031] Figure 4 It is a right side view of the motor structure in one embodiment of the present invention;

[0032] Figure 5 A front view of a motor structure in one embodiment of the present invention;

[0033] Figure 6 It is a schematic diagram of the structure of the front end cover or the rear end cover of the motor in one embodiment of the present invention.

[0034] The meanings of the reference numerals in the figure are as follows: 1. stator core, 2. motor housing, 3. axial groove, 4. liquid separation groove, 5. liquid inlet, 6. liquid inlet channel, 7. main channel, 8. liquid outlet, 9. motor front end cover, 10. motor rear end cover, 11. first winding cooling channel, 12. second winding cooling channel, 13. stator core cooling channel, 14. bearing lubrication channel, 15. first cooling groove, 16. second cooling groove, 17. arc baffle, 18. liquid spray nozzle, 19. liquid collecting tank, 20. liquid drain tank. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In order to more clearly describe the technical solution of the present invention, it is particularly provided that Figure 4 and Figure 6 The left side in the figure is the front end or the front side, and the right side is the rear end or the rear side.

[0039] Example 1

[0040] An embodiment of the present invention discloses a stator core cooling structure, which includes a stator core 1 and a motor housing 2 .

[0041] like Figure 1-2 As shown, a plurality of axial grooves 3 are distributed on the outer circumference of the stator core 1 and / or the inner circumference of the motor housing 2. The axial grooves 3 can be groove structures of various shapes, such as arc grooves, V-shaped grooves, polygonal grooves, etc. The axial grooves 3 extend in the axial direction of the stator core 1 and / or the motor housing 2. The axial grooves 3 arranged on the stator core 1 penetrate the entire stator core 1. The extension length of the axial grooves 3 arranged on the motor housing 2 is greater than the thickness of the stator core 1, and the axial grooves 3 on the motor housing 2 are directly opposite to the stator core 1; the number and position distribution of the axial grooves 3 can be adjusted according to actual needs.

[0042] The stator core 1 is assembled in the motor housing 2. Figure 3It can be seen that a coolant channel is formed between the stator core 1 and the motor housing 2, and the coolant cools the stator core 1 through the coolant channel.

[0043] In the stator core cooling structure of the present application, the axial groove 3 can be arranged in three situations: on the stator core 1 or the motor housing 2 or on the stator core 1 and the motor housing 2. Due to the design of the axial groove 3, when the stator core 1 is assembled in the motor housing 2, a cooling channel is formed between the stator core 1 and the motor housing 2. The oil can be directly contacted and cooled on the stator core 1 through the cooling channel. The contact area is large and the cooling efficiency is high. The stator core cooling structure is simple, which solves the problems of long processing cycle, high manufacturing cost, and complicated assembly process of grooving the inner wall of the housing in the prior art.

[0044] In one embodiment, the axial groove can be formed by punching a plurality of punching sheets and then stacking them, thereby avoiding the problems of long processing cycle, high cost, and complicated assembly process for grooving the inner wall of the motor housing.

[0045] An annular liquid separation groove 4 is provided on the inner wall of the motor housing 2, which is connected to the axial groove 3. The coolant is distributed to each coolant channel through the liquid separation groove 4. Figure 4 It can be seen that the position of the liquid separation groove 4 faces the stator core 1. The position of the liquid separation groove 4 can correspond to one end of the stator core 1, or to the middle area of ​​the stator core 1, so as to realize the coolant flowing from one end of the cooling channel to the other end, or from the middle of the cooling channel to both ends. After entering the liquid separation groove 4, the coolant flows around the motor housing 1 for one circle, and then is distributed into each coolant channel, taking away the heat on the surface of the stator core 1, thereby realizing the cooling of the stator core 1.

[0046] In one embodiment, the stator core 1 is composed of a plurality of stator punching sheets, the number of which can be adjusted according to actual needs. The stator punching sheets are formed by stamping, and the manufacturing is simple.

[0047] Example 2

[0048] The embodiment of the present invention also discloses a motor cooling system, such as Figure 4-6 As shown, the motor cooling system includes a liquid inlet 5, a liquid inlet channel 6, a liquid separation channel, any one of the above-mentioned stator core cooling structures, and a liquid outlet 8.

[0049] The liquid inlet 5 arranged above the motor housing 2 is connected to the stator core cooling structure through the liquid inlet channel 6 and the liquid separation channel arranged in the motor housing 2. One or more liquid outlets 8 can be provided, which are arranged at the lower part of the motor front end cover 9 and / or the motor rear end cover 10 and / or the lower end of the motor housing 2, so as to facilitate the discharge of the oil from the inside of the motor after completing the cooling and lubrication effects.

[0050] In this embodiment, the oil enters the motor cooling system through the liquid inlet 5, enters the main channel 7 of the liquid separation channel through the liquid inlet channel 6, and then enters the stator core cooling structure through the main channel 7 of the liquid separation channel, thereby cooling the stator core 1, and the cooled oil is discharged from the motor cooling system through the liquid outlet 8. The motor cooling system in this embodiment can cool the stator core, and the motor cooling system has a compact structure and good cooling and lubrication effects.

[0051] In one embodiment, Figure 4 and Figure 5 As shown, the liquid inlet channel 6 and the liquid separation channel are arranged in the upper part of the motor housing 2, and the liquid inlet channel 6 and the main channel 7 of the liquid separation channel can be vertically connected, wherein the main channel 7 of the liquid separation channel extends axially in the upper part of the motor housing 2, and the main channel 7 of the liquid separation channel passes through the motor housing 2, so that the oil can flow to the two ends of the motor, thereby realizing the cooling of the windings at both ends of the motor and the lubrication of the bearings at both ends.

[0052] Combination Figure 4 and Figure 5 , a stator core cooling channel 13 can be arranged vertically downward from the main channel 7. The stator core cooling channel 13 is arranged between the main channel 7 of the liquid separation channel and the liquid separation groove 4, and plays a connecting role, and is used to guide the oil in the liquid separation channel 7 to the liquid separation groove 4. The oil is distributed from the liquid separation groove 4 to each coolant channel in the stator core cooling structure, thereby cooling the stator core 1.

[0053] In one embodiment, the main channels 7 of the liquid separation channel are preferably two, which can be symmetrically arranged on both sides of the vertical center line of the motor housing 2. Correspondingly, there are also two stator core cooling channels 13. In actual processing, the number of main channels 7 can be adjusted according to actual needs.

[0054] In one embodiment, Figure 4-5 As shown, the motor cooling system also includes a winding cooling structure, which is connected to the main channel 7. The winding cooling structure can be used to cool the front and rear motor windings.

[0055] The main channel 7 further includes a first winding cooling channel 11 and a second winding cooling channel 12 which are respectively arranged downward.

[0056] The oil in the main channel 7 can cool the front end winding and the rear end winding of the motor through the first winding cooling channel 11 and the second winding cooling channel 12. The winding cooling structure includes a first cooling groove 15 and a second cooling groove 16. The first cooling groove 15 is connected to the first winding cooling channel 11, and the second cooling groove 16 is connected to the second cooling channel 12. The oil enters the first cooling groove 15 from the first winding cooling channel 11 and enters the second cooling groove 16 from the second cooling channel 12 in the main channel 7 of the liquid separation channel.

[0057] The first cooling groove 15 and the second cooling groove 16 are annular and are respectively arranged on the inner wall of the motor housing 2, and the first cooling groove 15 corresponds to the front end winding of the motor, and the second cooling groove 16 corresponds to the rear end winding of the motor.

[0058] In one embodiment, an arc-shaped baffle 17 is respectively provided on the inner side of the front cover 9 and the rear cover 10 of the motor. The first cooling groove 15 and the second cooling groove 16 are respectively assembled with the arc-shaped baffle 17 to form an annular channel. A liquid spray nozzle 18 is provided at the bottom of each annular channel. There are multiple liquid spray nozzles 18, which are evenly arranged. The oil in the annular channel can be sprayed onto the motor winding by the liquid spray nozzle 18 to achieve cooling of the motor winding. The liquid spray nozzle 18 and the arc-shaped baffle 17 can be integrally arranged or assembled.

[0059] In one embodiment, Figure 5 and Figure 6 As shown, the motor cooling system also includes a bearing lubrication structure, which is connected to the main channel 7; the bearing lubrication structure can be used to lubricate and cool the bearing.

[0060] The liquid separation channel also includes a bearing lubrication channel 14 arranged inside the front end cover and the rear end cover of the motor.

[0061] The oil in the main channel 7 cools and lubricates the front and rear bearings through the bearing lubrication channel 14. The bearing lubrication structure includes a liquid collecting tank 19 respectively arranged on the upper part of the bearing chamber in the front end cover 9 of the motor and the rear end cover 10 of the motor. The upper end of the liquid collecting tank 19 is connected to the bearing lubrication channel 14 arranged inside the front end cover 9 of the motor and the rear end cover 10 of the motor, and the lower end of the liquid collecting tank 19 corresponds to the motor bearing.

[0062] The oil in the main channel 7 flows into the collecting tank 19 through the bearing lubrication channel 14, and then flows from the collecting tank 19 to the motor bearing to lubricate and cool the motor bearing. In addition, the upper end of the collecting tank 19 is preferably funnel-shaped to facilitate the oil in the bearing lubrication channel 14 to flow into the collecting tank 19.

[0063] In one embodiment, Figure 6 As shown, a drain groove 20 is provided at the lower part of the bearing chamber of the motor front end cover 9 and / or the motor rear end cover 10. The drain groove 20 can also be provided at the lower end of the installation position of the rotary transformer stator. The drain can receive the coolant flowing out of the above cooling structures, which can prevent the oil from stirring and the increase of oil temperature caused by excessive oil, thereby preventing the reduction of motor performance and efficiency. The drain groove 20 is connected to the liquid outlet 8, and the oil in the drain groove 20 can be discharged from the liquid outlet 8.

[0064] In the present application, the oil enters the motor cooling system from the liquid inlet 5, then flows through the liquid inlet channel 6 and the main channel 7 in sequence, and then flows from the main channel 7 into the first winding cooling channel 11, the second winding cooling channel 12, the stator core cooling channel 13 and the bearing lubrication channel 14. The oil in the first winding cooling channel 11 is sprayed onto the front winding of the motor through the first cooling groove 15 and the liquid spray nozzle 18, and the oil in the second winding cooling channel 12 is sprayed onto the rear winding of the motor through the second cooling groove 16 and the liquid spray nozzle 18. The oil in the stator core cooling channel 13 flows into the coolant channel formed by the axial groove 3 and the inner wall of the motor housing 2 through the liquid separation groove 4, and the oil in the bearing lubrication channel 14 flows to the motor bearing through the liquid collecting groove 19, and the oil finally flows out of the motor cooling system through the liquid outlet 8. The motor cooling system can realize the cooling of the stator core 1, the motor winding and the motor bearing, as well as the lubrication of the motor bearing.

[0065] The above is only a specific embodiment of the present invention. Under the above teachings of the present invention, those skilled in the art can make other improvements or modifications on the basis of the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of the present invention, and the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A motor cooling system, characterized in that: The motor cooling system comprises a liquid inlet, a liquid inlet channel, a liquid separation channel, a stator core cooling structure and a liquid outlet; The stator core cooling structure comprises a stator core and a motor housing; A plurality of axial grooves are distributed on the outer circumference of the stator core and / or the inner circumference of the motor housing, and the axial grooves extend in the axial direction of the stator core and / or the motor housing; The stator core is assembled in the motor housing, and a coolant channel is formed between the stator core and the motor housing through the axial groove; An annular liquid separation groove is provided on the inner wall of the motor housing, and the coolant is distributed to each of the coolant channels through the liquid separation groove; The liquid inlet is arranged at the upper part of the motor housing, and is connected to the stator core cooling structure through the liquid inlet channel and the liquid separation channel arranged in the motor housing, and the liquid outlet is arranged at the lower part of the motor front end cover and / or the motor rear end cover and / or the lower end of the motor housing; The liquid inlet channel and the liquid separation channel are arranged at the upper part of the motor housing, wherein the liquid separation channel is communicated with the liquid inlet channel; The liquid separation channel includes a main channel extending in the axial direction of the upper part of the motor housing and a stator core cooling channel extending downward from the main channel; the stator core cooling channel is arranged between the main channel of the liquid separation channel and the liquid separation groove, and is used to guide the oil in the liquid separation channel into the liquid separation groove; the main channel of the liquid separation channel extends axially in the upper part of the motor housing, and the main channel of the liquid separation channel passes through the motor housing, so that the oil can flow to both ends of the motor, thereby cooling the windings at both ends of the motor and lubricating the bearings at both ends; The motor cooling system further comprises a bearing lubrication structure, wherein the bearing lubrication structure is in communication with the main channel; The liquid separation channel also includes a bearing lubrication channel arranged inside the motor front end cover and the motor rear end cover; The bearing lubrication structure includes a liquid collecting tank located at the upper part of the bearing chamber in the front end cover and the rear end cover of the motor, the liquid collecting tank is connected to the bearing lubrication channel, and the lower end of the liquid collecting tank corresponds to the motor bearing; the upper end of the liquid collecting tank is funnel-shaped.

2. The motor cooling system according to claim 1, characterized in that: There are two main channels, which can be symmetrically arranged on both sides of the vertical center line of the motor housing.

3. The motor cooling system according to claim 1, characterized in that: The motor cooling system further comprises a winding cooling structure, wherein the winding cooling structure is in communication with the main channel; The liquid separation channel also includes a first winding cooling channel and a second winding cooling channel extending downward from the main channel respectively; The winding cooling structure comprises a first cooling groove and a second cooling groove, the first cooling groove is communicated with the first winding cooling channel, and the second cooling groove is communicated with the second winding cooling channel; The first cooling groove and the second cooling groove are annular and are respectively arranged on the inner wall of the motor housing, and the first cooling groove corresponds to the front end winding of the motor, and the second cooling groove corresponds to the rear end winding of the motor.

4. The motor cooling system according to claim 3, characterized in that: The front end cover of the motor and the rear end cover of the motor are respectively provided with arc-shaped baffles on the inner sides, the first cooling groove and the second cooling groove are respectively assembled with the arc-shaped baffles to form an annular channel, and a liquid spray nozzle is provided at the bottom of each annular channel.

5. The motor cooling system according to claim 1, characterized in that: A drainage groove is provided at the lower part of the bearing chamber or the lower part of the installation position of the rotary transformer stator, and the drainage groove is connected to the liquid outlet.

6. The motor cooling system according to claim 1, characterized in that: The stator core is composed of a plurality of stator punching sheets, and the stator punching sheets are formed by stamping.

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