Stator heat dissipation structure and motor

Abstract

The utility model relates to the technical field of motors, in particular to a stator heat dissipation structure and a motor, and the stator heat dissipation structure comprises a motor casing which is provided with an oil inlet; the end covers are installed at the two ends of the motor shell, and an accommodating space is formed between the end covers and the motor shell; the stator iron core is arranged in the accommodating space, a staggered oil channel is formed between the outer side wall of the stator iron core and the inner side wall of the motor shell, and the staggered oil channel is communicated with the oil inlet; the iron core end plates are arranged on the two sides of the stator iron core and provided with oil outlets, and the joints of the iron core end plates and the motor shell are sealed; the front end of the annular oil blocking structure is connected with the end cover or the motor shell, the rear end of the annular oil blocking structure abuts against the iron core end plate, and an oil spraying opening facing the stator winding is formed in the annular oil blocking structure. The technical problem that a motor in the prior art can only carry out local and transient heat dissipation on a stator iron core and is difficult to meet the heat dissipation requirement of the motor is solved.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a stator heat dissipation structure and a motor. Background Technology

[0002] During motor operation, the main heat-generating component is the stator winding. When alternating current passes through it, the stator winding generates a rotating magnetic field, which interacts with the rotor's magnetic field to produce electromagnetic torque, thus causing the motor to rotate. Therefore, temperature rise control of the stator winding and its surrounding structure becomes crucial. Currently, motor cooling mainly involves setting up direct-connected heat dissipation channels at the stator ends and in the middle of the stator core, with the rotor throwing oil to both sides of the stator ends. These methods mostly only achieve localized heat dissipation, and the cooling medium can only stay on the structure requiring heat dissipation for a short time, resulting in low utilization of the cooling medium and difficulty in meeting the motor's heat dissipation requirements. Utility Model Content

[0003] To address the technical problem that existing motors can only provide localized and temporary heat dissipation to the stator core, which is insufficient to meet the motor's heat dissipation requirements, this invention provides a stator heat dissipation structure and a motor that solves the aforementioned technical problem.

[0004] To solve the above-mentioned technical problems, this utility model provides a stator heat dissipation structure, including:

[0005] Motor housing, the motor housing having an oil inlet;

[0006] End caps are installed at both ends of the motor housing, and an accommodating space is formed between the end caps and the motor housing;

[0007] A stator core is disposed within the accommodating space. An interlaced oil passage is formed between the outer side wall of the stator core and the inner side wall of the motor housing. The interlaced oil passage is connected to the oil inlet.

[0008] The iron core end plate is disposed on both sides of the stator iron core and has an oil outlet. The connection between the iron core end plate and the motor housing is sealed.

[0009] An annular oil baffle structure is provided, wherein the front end of the annular oil baffle structure is connected to the end cover or the motor housing, the rear end of the annular oil baffle structure abuts against the iron core end plate, and an oil spray port is provided on the annular oil baffle structure facing the stator winding.

[0010] According to one embodiment of the present invention, an oil return port is provided on the end cover, and an oil return channel is provided on the motor housing and the end cover, so that the cooling medium in the accommodating space is discharged from the oil return channel through the oil return port.

[0011] According to one embodiment of the present invention, the outer sidewall of the stator core is provided with multiple rows of protrusions along the circumferential direction, and each row of the protrusion array includes multiple protrusions spaced apart along the central axis of the stator core, so that an interlaced oil passage is formed between the outer sidewall of the stator core and the inner sidewall of the motor housing.

[0012] According to one embodiment of the present invention, the number of oil outlets opened on the iron core end plate is one, and the distance between the oil outlet and the oil inlet is greater than the diameter of the iron core end plate.

[0013] According to one embodiment of the present invention, the connection between the iron core end plate and the motor housing is an interference fit.

[0014] According to one embodiment of the present invention, the connection between the iron core end plate and the motor housing is sealed with an O-ring.

[0015] According to one embodiment of the present invention, the fuel injector is a hole-shaped opening.

[0016] According to one embodiment of the present invention, a sealing ring is also included, and the rear end of the annular oil-blocking structure abuts against the iron core end plate through the sealing ring.

[0017] According to one embodiment of the present invention, the end cap is made of metal, and when the front end of the annular oil baffle structure is connected to the end cap, the annular oil baffle structure and the end cap are integrally formed.

[0018] This utility model also provides an electric motor, including: a stator winding and a stator heat dissipation structure as described above, wherein the position of the oil injection port of the annular oil baffle structure corresponds to that of the stator winding.

[0019] Based on the above technical solution, the technical effects that this utility model can achieve are as follows:

[0020] The stator heat dissipation structure of this utility model, by opening an oil outlet on the iron core end plate and making the iron core end plate and the motor housing interference fit, can separate the stator iron core oil passage and the oil collecting cavity. The cooling medium can flow through all the oil passages in the oil passage between the stator iron core and the motor housing in a staggered oil passage structure before flowing into the oil collecting cavity from the oil outlet on the iron core end plate. After filling the oil collecting cavity, it is sprayed out from the oil spray nozzle to dissipate heat from the stator winding. This allows the stator iron core oil passage and the oil collecting cavity to use the maximum flow rate of cooling medium to dissipate heat from the surrounding structure. The heat dissipation area is large, the utilization rate of the cooling medium is high, and the motor heat dissipation capacity is strong.

[0021] The stator heat dissipation structure of this utility model further includes oil return channels on the motor housing and end cover, allowing the cooling medium to further dissipate heat from the motor housing through the oil return channels, thereby improving the utilization rate of the cooling medium.

[0022] The stator heat dissipation structure of this utility model has only one oil outlet on the iron core end plate, and the distance between the oil outlet and the oil inlet is greater than the diameter of the iron core end plate. This allows the cooling medium to enter the flow channel between the outer wall of the stator iron core and the inner wall of the motor housing from the oil inlet, and then flow through half of the outer wall of the stator iron core before entering the oil collection chamber from the oil outlet. This results in more sufficient heat dissipation and further improves the heat dissipation effect of the motor.

[0023] This utility model discloses a stator heat dissipation structure in which the annular oil baffle structure and the end cover are integrally formed. Compared with the plastic annular oil baffle structure, the metal annular oil baffle structure improves its own strength and reduces the risk of subsequent deformation. Moreover, for the sealing effect, only one sealing ring needs to be installed at the connection between the annular oil baffle structure and the iron core end plate to achieve the sealing effect of installing sealing rings at both ends of the independent annular oil baffle structure, which is less costly; the two processes of installing the annular oil baffle structure and installing the end cover are reduced to one, improving assembly efficiency.

[0024] The motor of this invention, having included the aforementioned stator heat dissipation structure, also possesses the aforementioned beneficial effects. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the motor of this utility model;

[0026] Figure 2 for Figure 1 Enlarged view of part A;

[0027] Figure 3 This is a schematic diagram of the sealing interface between the iron core end plate and the motor housing.

[0028] Figure 4 This is a schematic diagram of the connection between the iron core end plate and the motor housing.

[0029] Figure 5 This is a schematic diagram showing the flow direction of the cooling medium on the outer wall of the stator core.

[0030] Figure 6 This is a magnified view of a portion of the array of protrusions on the outer wall of the stator core.

[0031] Figure 7 A schematic diagram showing the use of a hard seal at the connection between the iron core end plate and the motor housing;

[0032] Figure 8 A schematic diagram showing the use of O-ring seals at the connection between the iron core end plate and the motor housing;

[0033] In the diagram: 1-Motor housing; 11-Oil inlet; 2-End cover; 21-Oil return port; 3-Stator core; 31-Protrusion; 4-Core end plate; 41-Oil outlet; 42-Sealing interface; 5-Annular oil baffle structure; 51-Oil spray nozzle; 6-Oil collection chamber; 7-Stator winding; 8-Oil return channel; 9-Sealing ring. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0036] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0037] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0038] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0039] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0040] like Figure 1 and 2 As shown, this embodiment provides a stator heat dissipation structure, including a motor housing 1, end caps 2, a stator core 3, core end plates 4, and an annular oil baffle structure 5. The motor housing 1 has an oil inlet 11; the end caps 2 are installed at both ends of the motor housing 1, forming an accommodating space between the end caps 2 and the motor housing 1; the stator core 3 is disposed within the accommodating space, and staggered oil channels are formed between the outer sidewall of the stator core 3 and the inner sidewall of the motor housing 1, communicating with the oil inlet 11; the core end plates 4 are disposed on both sides of the stator core 3 and have oil outlets 41; the connection between the core end plates 4 and the motor housing 1 is sealed, and the sealing interface 42 between the core end plates 4 and the motor housing 1 is as follows: Figure 3 and 4As shown; the front end of the annular oil baffle structure 5 is connected to the end cover 2 or the motor housing 1, and the rear end of the annular oil baffle structure 5 abuts against the iron core end plate 4, thereby forming an oil collecting cavity 6 between the annular oil baffle structure 5, the end cover 2, the motor housing 1, and the iron core end plate 4. The annular oil baffle structure 5 has an oil spray nozzle 51 facing the stator winding 7, so that the cooling medium entering the oil collecting cavity 6 through the oil outlet 41 of the iron core end plate 4 can be sprayed onto the stator winding 7 at both ends of the stator core 3 through the oil spray nozzle 51. Among them, Figure 1 The direction indicated by the middle arrow is the flow direction of the cooling medium.

[0041] Based on the above structure, the cooling medium can be split into two paths from the oil inlet (or it can be one, three, four, etc.). Figure 1 (Two paths) enter the oil passage between the stator core 3 and the motor housing 1 (e.g., two paths) Figure 5 and 6 As shown, the oil fills the cavity between the stator core 3 and the motor housing 1. Then, the oil flows into the oil collecting chamber 6 through the oil outlet 41 of the core end plate 4, and after filling the collecting chamber 6, it is sprayed out from the spray nozzle 51 to dissipate heat from the stator winding 7. The stator core cooling and the end stator winding cooling are connected in series by an oil circuit. Each part uses the maximum flow rate of cooling medium for cooling, resulting in a large heat dissipation area, high utilization rate of the cooling medium, and strong motor cooling capacity. Figure 5 and Figure 6 The direction the arrow points indicates the flow direction of the cooling medium.

[0042] As a preferred technical solution in this embodiment, an oil return port 21 can be provided on the end cover 2, and an oil return channel 8 can be provided on the motor housing 1 and the end cover 2, so that the cooling medium in the accommodating space can be discharged from the oil return channel 8 through the oil return port 21. When the cooling medium passes through the oil return channel 8, it can further dissipate heat on the motor housing 1, so that the cooling medium can be fully utilized.

[0043] like Figure 5 and Figure 6 As shown, as a preferred technical solution of this embodiment, the outer sidewall of the stator core 3 is provided with multiple rows of protrusions along the circumferential direction. Each row of protrusions includes multiple protrusions 31 spaced apart along the central axis of the stator core 3, so that an interlaced flow channel is formed between the outer sidewall of the stator core 3 and the inner sidewall of the motor housing 1, so that the cooling medium can flow in a meandering manner in the interlaced flow channel, increasing the residence time of the cooling medium in the flow channel and improving the utilization efficiency of the cooling medium.

[0044] In some other embodiments of this utility model, grooves and channels may be opened on the inner sidewall of the motor housing 1 according to actual needs, so that an interlaced oil passage is formed between the outer sidewall of the stator core 3 and the inner sidewall of the motor housing 1. This embodiment does not limit this.

[0045] As a preferred technical solution in this embodiment, the number of oil outlets 41 opened on the iron core end plate 4 is one. The distance between the oil outlet 41 and the oil inlet 11 is greater than the diameter of the iron core end plate. This allows the cooling medium to enter the flow channel between the outer wall of the stator iron core 3 and the inner wall of the motor housing 1 from the oil inlet 11, and then flow through half of the outer wall of the stator iron core 3 before entering the oil collection chamber 6 from the oil outlet 41, thereby improving the heat dissipation effect of the motor.

[0046] like Figure 7 As shown, in one embodiment of this utility model, the connection between the iron core end plate 4 and the motor housing 1 can be sealed by an interference fit, a hard seal method. Specifically, leakage of the cooling medium at the contact interface can be reduced by designing a reasonable interference fit and a sufficiently large axial connection length.

[0047] like Figure 8 As shown, in another embodiment of this utility model, the connection between the iron core end plate 4 and the motor housing 1 can also be sealed by a soft seal, such as using an O-ring seal at the connection between the iron core end plate 4 and the motor housing 1. This embodiment does not impose any limitations.

[0048] In one embodiment of this utility model, the oil injection port 51 may be an annular opening, so that the cooling medium can be directly sprayed onto the stator winding 7 at the stator end.

[0049] In another embodiment of this utility model, the oil spray nozzle 51 can be a hole-shaped opening, so that the cooling medium can be sprayed out quickly and accurately onto the stator winding 7 to dissipate heat from the stator end winding.

[0050] To ensure the sealing of the oil collecting cavity 6, as a preferred technical solution in this embodiment, the stator heat dissipation structure may further include a sealing ring 9, and the rear end of the annular oil baffle structure 5 can abut against the core end plate 4 through the sealing ring 9 (e.g., Figure 4 (As shown). When the front end of the annular oil baffle structure 5 abuts against the end cover 2 or the motor housing 1, a sealing ring can also be provided at the connection to improve the sealing effect. This embodiment does not impose any restrictions on this.

[0051] In one embodiment of this utility model, the annular oil baffle structure 5 can be a plastic part. When assembling the motor, the annular oil baffle structure 5 needs to be installed separately. When the annular oil baffle structure 5 abuts against the iron core end plate 4 via the sealing ring 9, since the annular oil baffle structure 5 and the end cover 2 need to be installed separately, and because of the presence of the sealing ring 9, assembly requires external force or must be performed while the casing is hot. This assembly is somewhat difficult and carries the risk of damage.

[0052] As a preferred technical solution in this embodiment, the end cap 2 is made of metal. When the front end of the annular oil-blocking structure 5 is connected to the end cap 2, the annular oil-blocking structure 5 and the end cap 2 are integrally formed. Thus, the annular oil-blocking structure 5 is changed from a plastic part to a metal part, improving its strength and reducing the risk of subsequent deformation. Furthermore, for a sealing effect, only one sealing ring 9 needs to be installed at the connection between the annular oil-blocking structure 5 and the iron core end plate 4 to achieve the sealing effect of installing sealing rings at both ends of the annular oil-blocking structure 5, resulting in lower costs. The two processes of installing the annular oil-blocking structure 5 and installing the end cap 2 are reduced to one, improving assembly efficiency.

[0053] like Figure 1 As shown, this embodiment also provides a motor, including: a stator winding 7 and a stator heat dissipation structure as described above. The position of the oil spray port 51 of the annular oil baffle structure 5 corresponds to the stator winding 7, so that the cooling medium can be sprayed onto the stator winding 7 from the oil spray port 51. The motor according to this utility model embodiment, since it includes the above-mentioned stator heat dissipation structure, also has the above-mentioned beneficial effects.

[0054] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A stator heat dissipation structure, characterized by comprising: The application relates to a motor stator heat dissipation structure. The motor stator heat dissipation structure comprises the following parts: a motor casing (1) having an oil inlet (11); end covers (2) installed at two ends of the motor casing (1), and a containing space formed between the end covers (2) and the motor casing (1); a stator core (3) arranged in the containing space, and an interlaced oil channel formed between an outer side wall of the stator core (3) and an inner side wall of the motor casing (1), the interlaced oil channel being communicated with the oil inlet (11); core end plates (4) arranged at two sides of the stator core (3) and provided with oil outlets (41), and the core end plates (4) being sealed at the connection with the motor casing (1); 2. The stator heat dissipation structure according to claim 1, characterized by a ring-shaped oil blocking structure (5) having a front end connected with the end cover (2) or the motor casing (1) and a rear end abutting against the core end plate (4), and the ring-shaped oil blocking structure (5) being provided with oil injection ports (51) facing the stator winding (7).

3. The stator heat dissipation structure according to claim 1, characterized by The end cover (2) is provided with an oil return port (21), and the motor casing (1) and the end cover (2) are provided with an oil return channel (8) so that the cooling medium in the containing space is discharged from the oil return channel (8) through the oil return port (21).

4. The stator heat sink structure of claim 1, wherein The outer side wall of the stator core (3) is provided with a plurality of rows of protrusion arrays in the circumferential direction, each row of the protrusion arrays comprising a plurality of protrusions arranged at intervals along the central axis of the stator core (3), so that the interlaced oil channel is formed between the outer side wall of the stator core (3) and the inner side wall of the motor casing (1).

5. The stator heat sink structure of claim 1, wherein The number of the oil outlets (41) provided on the core end plate (4) is one, and the distance between the oil outlet (41) and the oil inlet (11) is greater than the diameter of the core end plate (4).

6. The stator heat sink structure of claim 1, wherein The connection between the core end plate (4) and the motor casing (1) is in interference fit.

7. The stator heat sink structure of claim 1, wherein The connection between the core end plate (4) and the motor casing (1) is sealed by an O-ring.

8. The stator heat sink structure of claim 1, wherein The oil injection port (51) is a hole-shaped opening.

9. The stator heat dissipating structure according to claim 1 or 8, characterized by The rear end of the ring-shaped oil blocking structure (5) abuts against the core end plate (4) through a sealing ring (9).

10. An electric machine characterized by The end cover (2) is made of metal, and the ring-shaped oil blocking structure (5) is integrally formed with the end cover (2) when the front end of the ring-shaped oil blocking structure (5) is connected with the end cover (2). The application further relates to a motor stator winding (7) and the motor stator heat dissipation structure as claimed in any one of claims 1 to 9, and the position of the oil injection port (51) of the ring-shaped oil blocking structure (5) corresponds to the position of the stator winding (7).

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