Motor stator oil cooling structure and motor

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By setting through holes and opening grooves on the outer wall of the motor stator core and setting shell oil grooves on the inner wall of the tubular shell to form an axial oil circuit, the poor cooling effect and connection stability problems in the existing motor stator oil-cooled structure are solved, and comprehensive cooling of the stator core and flat wire windings are achieved and higher cooling efficiency is achieved.

CN222940591UActive Publication Date: 2025-06-03HEFEI JUYI POWER SYST CO LTD

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Patent Information

Application Number: CN202421492848.6
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-06-26
Publication Date: 2025-06-03
Estimated Expiration: 2034-06-26

AI Technical Summary

Technical Problem

In the existing motor stator oil-cooled structure, the number of oil passages and cross-sectional area on the outer wall of the stator core are limited, resulting in insufficient oil drainage coverage and poor internal heat exchange effect. Too much cooling oil will reduce the connection stability between the stator core and the tubular shell.

Method used

A motor stator oil-cooled structure is designed. By setting a through hole and an open groove extending axially in the outer wall of the stator core, and a housing oil groove is provided on the inner wall of the tubular shell. The cooling oil flows along the circumference of the shell oil groove and enters the inside of the stator core through the through hole and the opening groove, forming an axial oil path to cool the stator core and the flat wire winding.

Benefits of technology

This structure can fully cool the outer circumference and interior of the stator core, the flat wire winding, especially the ends of its ends, improve the cooling effect, and does not affect the connection stability between the stator core and the tubular housing, and the cooling oil flow efficiency is higher.

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Abstract

The utility model relates to the technical field of motor and electric power transmission, and discloses a motor stator oil cooling structure, which comprises a tubular shell, a stator core, a stator core, a stator core, a stator core and a stator core, and is characterized in that the inner wall of the tubular shell is provided with shell oil grooves extending along the circumferential direction; the outer wall of the stator iron core is fixedly connected with the inner wall of the tubular shell, a through hole extending in the axial direction is formed in the end face of the stator iron core, an open groove is formed in the outer wall of the stator iron core, the inner end of the open groove is connected with the through hole, the outer end of the open groove is connected with the shell oil groove, and a plurality of tooth grooves extending in the axial direction are formed in the inner wall of the stator iron core; and the flat wire winding is arranged in the tooth groove, and the two end parts of the flat wire winding correspond to the two end parts of the through hole respectively, so that the cooling oil flowing out of the end parts of the through hole can cool the end parts of the flat wire winding. The utility model also provides a motor. According to the utility model, the stator iron core and the flat wire winding can be fully cooled, the cooling effect is improved, and the influence of cooling oil on the connection stability between the motor shell and the stator iron core is avoided.

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Description

Technical Field

[0001] The utility model relates to the technical field of motors and electric power transmissions, and particularly relates to a motor stator oil cooling structure and a motor. Background Art

[0002] With the increase of motor power, the requirements for motors in the field of new energy vehicles are getting higher and higher. The heat dissipation of motors directly restricts the improvement of the power of electric vehicles, as well as the electrical and mechanical properties of motors. When the motor operates, a large amount of heat is generated in the stator core and the flat wire winding due to the passing of current. In order to reduce the temperature of these components, cooling oil is usually directly applied to the heat-generating parts for cooling, so the cooling efficiency can be greatly improved. In related technologies, grooves are usually formed on the outer wall of the stator core as oil channels to dissipate heat from the winding. Since the stator core needs to be fixedly connected to the inner wall of the tubular housing through interference fit or other means, the number and cross-sectional area of the oil channels provided on the outer wall are limited, resulting in problems such as insufficient oil spraying coverage and poor internal heat exchange effect of the stator core; moreover, a large amount of cooling oil at the connection surface between the tubular housing and the stator core will reduce the connection stability between the two. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a motor stator oil cooling structure and a motor to at least partially solve the technical problems mentioned in the background art part.

[0004] To achieve the above purpose, the first aspect of the utility model provides a motor stator oil cooling structure, including:

[0005] A tubular housing, on the inner wall of which a circumferentially extending housing oil groove is provided;

[0006] A stator core, the outer wall of which is fixedly connected to the inner wall of the tubular housing. Axially extending through holes are formed on the end face of the stator core, and an opening groove is formed on the outer wall of the stator core. The inner end of the opening groove is connected to the through hole, the outer end of the opening groove is connected to the housing oil groove, and a plurality of axially extending tooth grooves are provided on the inner wall of the stator core; and

[0007] A flat wire winding, which is arranged in the tooth grooves, and the two end parts of the flat wire winding are respectively arranged corresponding to the two end parts of the through hole, so that the cooling oil flowing out from the end part of the through hole can cool the end parts of the flat wire winding.

[0008] Preferably, a plurality of through holes are provided, and the plurality of through holes are arranged at intervals circumferentially; a plurality of opening grooves are provided, the inner ends of the plurality of opening grooves are respectively connected to the plurality of through holes one by one, and the outer ends of the plurality of opening grooves are all connected to the housing oil groove.

[0009] Preferably, the plurality of opening grooves are all arranged in the middle of the outer wall of the stator core.

[0010] Preferably, a plurality of tooth grooves are arranged at equal intervals circumferentially along the inner wall of the stator core.

[0011] Preferably, an oil inlet passage extending axially is provided on the outer wall of the tubular housing, and an oil inlet hole extending radially is provided inside the tubular housing. Both ends of the oil inlet hole communicate with the oil inlet passage and the housing oil groove respectively.

[0012] Preferably, the oil cooling structure of the motor stator further includes an oil guiding ring coaxially connected to the end of the stator core. The end of the flat wire winding is arranged inside the oil guiding ring, and the oil guiding ring is used to collect the cooling oil flowing out from the end of the through hole.

[0013] Preferably, there are two oil guiding rings, and the two oil guiding rings are respectively coaxially connected to the two ends of the stator core; and / or, the oil guiding ring is provided with an oil guiding hole extending radially.

[0014] Preferably, cavities are provided at both ends of the tubular housing. The oil guiding ring divides the cavity into an inner cavity and an outer cavity. The inner cavity communicates with the inner cavity of the stator core and is used to collect the cooling oil, and the outer cavity is used to lead out the coolant flowing out from the oil guiding hole to the outside of the tubular housing.

[0015] Preferably, the inner wall of the tubular housing is tightly sleeved on the outer wall of the stator core and the two are in interference fit.

[0016] In a second aspect of the present invention, an oil cooling structure of a motor stator is provided, which includes the above-mentioned oil cooling structure of the motor stator.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) When the oil cooling structure of the motor stator is working, the cooling oil flowing circumferentially along the housing oil groove can cool the outer periphery of the stator core, the coolant flowing axially along the through hole can cool the stator core and the flat wire winding, and the cooling oil flowing out from the end of the through hole can cool the end of the flat wire winding. Therefore, the oil cooling structure of the motor stator can comprehensively cool the outer periphery and the inside of the stator core, the flat wire winding, especially the end of the flat wire winding, and improves the cooling effect;

[0019] (2) The axial oil passage formed by the through hole inside the stator core can ensure sufficient heat exchange between the cooling oil and the area inside the stator core, and further improves the cooling effect;

[0020] (3) It is found through simulation and actual tests that the temperature of the middle section of the stator core and the winding is high. This method feeds oil through the middle of the stator core, preferentially cools the middle of the stator core, and has a better cooling effect;

[0021] (4) The axial oil passage formed by the through holes inside the stator core will not affect the connection stability between the outer wall of the stator core and the inner wall of the housing. Therefore, more oil passages can be provided with a larger cross-sectional area to further improve the cooling effect.

[0022] (5) Since the axial oil passage is arranged inside the stator core, the content of cooling oil at the connection surface between the outer wall of the stator core and the inner wall of the tubular housing is reduced, avoiding the problem that the cooling oil at the connection surface reduces the connection stability between the stator core and the tubular housing, thereby ensuring that a stable connection can be formed between the stator core and the tubular housing through interference fit or other means.

[0023] (6) It also avoids the resistance of the contact surface between the stator core and the tubular housing to the flow of cooling oil, improving the circulation efficiency of the cooling oil. Description of the Drawings

[0024] Figure 1 is a schematic diagram of the oil cooling structure of the motor stator in an embodiment;

[0025] Figure 2 is an axial sectional view of the oil cooling structure of the motor stator in an embodiment;

[0026] Figure 3 is a radial sectional view of the oil cooling structure of the motor stator in an embodiment;

[0027] Figure 4 is a schematic diagram of the structure of the stator core in an embodiment;

[0028] Figure 5 is a schematic diagram of the structure of the oil guiding ring in an embodiment;

[0029] Among them, the description of the reference numerals is as follows:

[0030] 1 - Tubular housing; 101 - Housing oil groove; 102 - Oil inlet passage; 103 - Oil inlet hole; 2 - Stator core; 201 - Through hole; 202 - Open slot; 203 - Tooth slot; 3 - Flat wire winding; 4 - Oil guiding ring; 401 - Oil guiding hole. Detailed Embodiments

[0031] The following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining and illustrating the present invention, and are not used to limit the present invention.

[0032] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "arrangement", "installation", and "connection" 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 direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] In the description of the present utility model, unless otherwise stated, the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0034] In addition, if there is a description involving "first", "second", etc. in the present utility model, the description of "first", "second", etc. is only for descriptive purposes and cannot be understood as indicating or implying its relative importance or implicitly indicating the quantity of the technical features indicated. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0035] Referring to Figures 1-4 , this embodiment provides an oil cooling structure for a motor stator, including:

[0036] A tubular housing 1, on the inner wall of the tubular housing 1, there is provided a housing oil groove 101 extending circumferentially;

[0037] A stator core 2, the outer wall of the stator core 2 is fixedly connected to the inner wall of the tubular housing 1. On the end face of the stator core 2, there is provided a through hole 201 extending axially. On the outer wall of the stator core 2, there is provided an open slot 202. The inner end of the open slot 202 is connected to the through hole 201, and the outer end of the open slot 202 is connected to the housing oil groove 101. On the inner wall of the stator core 2, there are provided a plurality of tooth grooves 203 extending axially; and

[0038] A flat wire winding 3, the flat wire winding 3 is arranged in the tooth grooves 203, and the two end parts of the flat wire winding 3 are respectively arranged corresponding to the two end parts of the through hole 201, so that the cooling oil flowing out from the end part of the through hole 201 can cool the end parts of the flat wire winding 3.

[0039] The working principle of the oil cooling structure of the motor stator is as follows: The cooling oil is introduced into the housing oil groove 101, flows circumferentially along the housing oil groove 101 and cools the outer periphery of the stator core 2; the cooling oil in the housing oil groove 101 enters the through holes 201 inside the stator core 2 through these opening grooves 202, and the cooling oil flows axially in the through holes 201 to cool the stator core 2 and the flat wire winding 3; the cooling oil flowing out from the end of the through hole 201 can cool the end of the flat wire winding 3.

[0040] The oil cooling structure of the motor stator can comprehensively cool the outer periphery and the inside of the stator core 2, the flat wire winding 3, especially the end of the flat wire winding 3, improving the cooling effect; the axial oil path formed by the through holes 201 inside the stator core 2 ensures that the cooling oil can fully exchange heat with the area inside the stator core 2, further improving the cooling effect; the axial oil path formed by the through holes 201 inside the stator core 2 does not affect the connection stability between the outer wall of the stator core 2 and the inner wall of the housing. Therefore, more numbers and a larger oil path cross-sectional area can be set to further improve the cooling effect; since the axial oil path is arranged inside the stator core 2, the content of the cooling oil at the connection surface between the outer wall of the stator core 2 and the inner wall of the tubular housing 1 is reduced, avoiding the problem that the cooling oil at the connection surface reduces the connection stability between the stator core 2 and the tubular housing 1, thus ensuring that a stable connection can be formed between the stator core 2 and the tubular housing 1 through interference fit or other means; it also avoids the resistance of the contact surface between the stator core 2 and the tubular housing 1 to the flow of the cooling oil, improving the circulation efficiency of the cooling oil.

[0041] In one embodiment, the inner wall of the tubular housing 1 is tightly sleeved on the outer wall of the stator core 2 and the two are in interference fit, so that the two can be stably connected through simple assembly, and it is ensured that the outer wall of the stator core 2 seals the housing oil groove 101 to prevent the leakage of the cooling oil in the housing oil groove 101.

[0042] In one embodiment, a plurality of through holes 201 are provided, and the plurality of through holes 201 are arranged at intervals circumferentially; a plurality of opening grooves 202 are provided, and the inner ends of the plurality of opening grooves 202 are connected to the plurality of through holes 201 one by one, and the outer ends of the plurality of opening grooves 202 are all connected to the housing oil groove 101. By providing a plurality of through holes 201, the cooling oil can exchange heat with more areas inside the stator core 2, further improving the cooling effect, and can more evenly transport the cooling oil to the end of the flat wire winding 3. Further, the plurality of opening grooves 202 are all arranged in the middle of the outer wall of the stator core 2, and the plurality of opening grooves 202 are evenly arranged at intervals along the circumference of the outer wall, so that the paths to both ends of the through hole 201 are the same, avoiding the flow resistance difference caused by the path difference, and further ensuring the uniform flow of the cooling oil in the through hole 201.

[0043] In one embodiment, an oil inlet passage 102 extending axially is provided on the outer wall of the tubular housing 1, and an oil inlet hole 103 extending radially is provided inside the tubular housing 1. Both ends of the oil inlet hole 103 communicate with the oil inlet passage 102 and the housing oil groove 101 respectively. Cooling oil is introduced into the housing oil groove 101 through the oil inlet passage 102 and the oil inlet hole 103, and the oil inlet passage 102 can be conveniently connected to an external cooling system such as a radiator and receive the cooling oil provided by the external cooling system.

[0044] In one embodiment, the oil cooling structure of the motor stator further includes an oil guiding ring 4 coaxially connected to the end of the stator core 2. The end of the flat wire winding 3 is arranged inside the oil guiding ring 4, and the oil guiding ring 4 is used to collect the cooling oil flowing out from the end of the through hole 201. There are two oil guiding rings 4, and the two oil guiding rings 4 are respectively coaxially connected to the two ends of the stator core 2. Refer to Figure 5 , further, an oil guiding hole 401 extending radially is provided on the oil guiding ring 4. Further still, cavities are provided at both ends of the tubular housing 1, and the oil guiding ring 4 divides the cavity into an inner cavity and an outer cavity, wherein the inner cavity communicates with the inner cavity of the stator core 2 and is used to collect the cooling oil so as to cool the flat wire winding 3, and the outer cavity is used to lead out the cooling liquid flowing out from the oil guiding hole 401 so as to realize the circulation of the cooling liquid.

[0045] This embodiment also provides a motor, which includes the oil cooling structure of the motor stator as described above. Other structures in the motor such as the rotor are not described and defined in detail and are conventional structures in the art. Since the motor adopts the above oil cooling structure of the motor stator, it also has the beneficial effects of the above oil-cooled stator structure.

[0046] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, including any suitable combination of each specific technical feature. To avoid unnecessary repetition, the present invention does not separately describe various possible combination methods. But these simple modifications and combinations should also be regarded as the content disclosed by the present invention and fall within the protection scope of the present invention.

Claims

1. A motor stator oil cooling structure, characterized in that: include: A tubular housing (1), wherein a housing oil groove (101) extending in a circumferential direction is provided on the inner wall of the tubular housing (1); A stator core (2), wherein the outer wall of the stator core (2) is fixedly connected to the inner wall of the tubular housing (1), a through hole (201) extending in the axial direction is provided on the end surface of the stator core (2), an open slot (202) is provided on the outer wall of the stator core (2), the inner end of the open slot (202) is connected to the through hole (201), the outer end of the open slot (202) is connected to the housing oil groove (101), and a plurality of tooth slots (203) extending in the axial direction are provided on the inner wall of the stator core (2); and A flat wire winding (3), the flat wire winding (3) being arranged in the tooth slot (203), and the two ends of the flat wire winding (3) being arranged corresponding to the two ends of the through hole (201) respectively, so that the cooling oil flowing out from the ends of the through hole (201) can cool the ends of the flat wire winding (3).

2. The motor stator oil cooling structure according to claim 1, characterized in that: A plurality of through holes (201) are provided, and the plurality of through holes (201) are arranged at intervals along the circumferential direction; a plurality of open grooves (202) are provided, and the inner ends of the plurality of open grooves (202) are connected to the plurality of through holes (201) in a one-to-one correspondence, and the outer ends of the plurality of open grooves (202) are connected to the housing oil groove (101).

3. The motor stator oil cooling structure according to claim 2 is characterized in that: The plurality of open slots (202) are all arranged in the middle of the outer wall of the stator core (2).

4. The motor stator oil cooling structure according to claim 1, characterized in that: The plurality of tooth slots (203) are evenly spaced and arranged along the circumferential direction of the inner wall of the stator core (2).

5. The motor stator oil cooling structure according to claim 1, characterized in that: An oil inlet passage (102) extending in the axial direction is arranged on the outer wall of the tubular housing (1), and an oil inlet hole (103) extending in the radial direction is arranged inside the tubular housing (1), and two ends of the oil inlet hole (103) are respectively connected to the oil inlet passage (102) and the housing oil groove (101).

6. The motor stator oil cooling structure according to claim 1, characterized in that: The motor stator oil cooling structure also includes an oil guide ring (4) coaxially connected to the end of the stator core (2), the end of the flat wire winding (3) is arranged in the oil guide ring (4), and the oil guide ring (4) is used to collect cooling oil flowing out from the end of the through hole (201).

7. The motor stator oil cooling structure according to claim 6, characterized in that: Two oil guide rings (4) are provided, and the two oil guide rings (4) are coaxially connected to the two ends of the stator core (2) respectively; and / or the oil guide ring (4) is provided with an oil guide hole (401) extending in the radial direction.

8. The motor stator oil cooling structure according to claim 7, characterized in that: Both ends of the tubular shell (1) are provided with cavities, and the oil guide ring (4) divides the cavity into an inner cavity and an outer cavity, the inner cavity is connected to the inner cavity of the stator core (2) and is used to collect cooling oil, and the outer cavity is used to guide the cooling liquid flowing out of the oil guide hole (401) to the outside of the tubular shell (1).

9. The motor stator oil cooling structure according to claim 1, characterized in that: The inner wall of the tubular housing (1) is tightly sleeved on the outer wall of the stator core (2) and the two are interference fit.

10. A motor, characterized in that: It comprises the motor stator oil cooling structure as described in any one of claims 1 to 9.