CN115173594A - Cooling structure of oil-cooled motor, oil-cooled motor and vehicle - Google Patents

Abstract

The invention relates to the technical field of motors, in particular to a cooling structure of an oil-cooled motor, the oil-cooled motor and a vehicle; cooling structure of oil-cooled motor includes: a housing; the stator core is arranged in the shell, a slot is formed in the stator core, and the slot is communicated with the stator slot in the stator core; the winding is arranged in the stator slot and is far away from one end of the slot; the packaging device wraps the winding device and is used for plugging the stator slots, and the inner surface of the packaging device, the slots and the stator slots form a cooling flow channel together; and the oil return groove is communicated with the cooling flow channel. The cooling structure of the oil-cooled motor forms a cooling flow channel together with the slotting and the stator slot through the inner surface of the packaging device, and cooling oil can fully, comprehensively and uniformly flow through the winding and the end part of the winding to fully cool the winding and the end part of the winding, so that the heat dissipation uniformity is achieved, and the utilization rate of the cooling oil is increased.

Description

Cooling structure of oil-cooled motor, oil-cooled motor and vehicle

Technical Field

The invention relates to the technical field of motors, in particular to a cooling structure of an oil-cooled motor, the oil-cooled motor and a vehicle.

Background

In recent years, new energy automobiles have been widely used, and index requirements of driving motors as core parts in new energy automobiles are also increasing. As the demands for low cost, miniaturization and high power density of the motor increase, the heat dissipation problem of the motor becomes more important. Therefore, the cooling method is also required to be higher. In order to solve the problems of the conventional water cooling and air cooling technologies, such as low heat dissipation efficiency and large occupied space, the oil cooling technology is the hot research direction for heat dissipation of the motor.

During operation of the motor, the motor windings are one of the main heat generating components. The oil cooling mode of cooling winding commonly used at present is mostly spraying the cooling. The flow direction of the cooling oil sprayed to the end part of the winding is difficult to control, part of the cooling oil is directly sprayed or dripped to other parts, the part of the cooling oil can not effectively dissipate heat of the winding, and the cooling efficiency of the cooling oil is reduced. Meanwhile, the cooling oil flowing along the winding has unsatisfactory heat dissipation uniformity and cannot flow across the winding surface uniformly. The existing oil cooling spraying design can not uniformly radiate the winding, and has low utilization rate of cooling oil and great limitation.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the problems that the existing oil-cooling spraying design in the prior art cannot uniformly radiate heat to the winding, and the utilization rate of cooling oil is not high, so that the limitation is large, thereby providing a cooling structure of an oil-cooling motor, the oil-cooling motor and a vehicle.

In order to solve the above technical problem, the present invention provides a cooling structure of an oil-cooled motor, including: a housing; the stator core is arranged in the shell, a slot is formed in the stator core, and the slot is communicated with the stator slot in the stator core; the winding is arranged in the stator slot and is far away from one end of the slot; the packaging device wraps the winding device and is used for plugging the stator slots, and the inner surface of the packaging device, the slots and the stator slots form a cooling flow channel together; and the oil return groove is communicated with the cooling flow channel.

Furthermore, the stator core comprises a plurality of first stator punching sheets and a plurality of second stator punching sheets which are sequentially overlapped, the slot is formed in the first stator punching sheets, and the stator slot is formed in the first stator punching sheets and the second stator punching sheets.

Furthermore, the number of the slots is multiple, and the slots are distributed at intervals along the circumferential direction of the first stator punching sheet.

Further, the slots are arranged perpendicular to the stator slots.

Furthermore, the two packaging devices are arranged at two ends of the winding and flush with the outer surface of the stator core.

Furthermore, the packaging device and the shell are provided with openings, and the openings are connected with the oil return grooves.

Further, the oil return device also comprises a connecting pipe, and the connecting pipe is connected with the opening and the oil return groove.

Further, still include: the rotating shaft is arranged in the shell, and two ends of the rotating shaft extend out of the shell; and the rotor is sleeved on the rotating shaft, is positioned in the stator iron core and is coaxially arranged with the stator iron core.

The invention also provides an oil-cooled motor which comprises the cooling structure of the oil-cooled motor.

The invention also provides a vehicle comprising the oil-cooled motor.

The technical scheme of the invention has the following advantages:

1. the invention provides a cooling structure of an oil-cooled motor, comprising: a housing; the stator core is arranged in the shell, a slot is formed in the stator core, and the slot is communicated with the stator slot in the stator core; the winding is arranged in the stator slot and is far away from one end of the slot; the packaging device wraps the winding device and is used for plugging the stator slots, and the inner surface of the packaging device, the slots and the stator slots jointly form a cooling flow channel; and the oil return groove is communicated with the cooling flow channel.

The stator core is provided with the slots which are arranged at the later stage, the slots are communicated with the original stator slots in the stator core, and meanwhile, the windings are arranged in the stator slots, and the two ends of the windings are wrapped by the packaging device, so that the packaging device is used for plugging the stator slots. The inner part of the packaging device, the grooving and the stator groove jointly form a cooling flow channel, when cooling oil is introduced into the cooling flow channel, the cooling oil flows to the winding end part through the stator groove under the action of pressure, the cooling oil at the winding end part is filled with the whole winding end part and the cooling flow channel under the action of pressure and gravity and flows through the surfaces of all the winding end parts to perform sufficient heat exchange on the winding and the winding end part, finally reaches the hole at the bottom end of the gravity direction of the winding end part, and the cooling oil after heat exchange falls back to the oil return groove under the action of gravity so as to perform the next cooling circulation.

The cooling structure of the oil-cooled motor forms a cooling flow channel together with the slotting and the stator slot through the inside of the packaging device, cooling oil can fully, comprehensively and uniformly flow through the winding and the end part of the winding to fully cool the winding and the end part of the winding, so that the heat dissipation uniformity is achieved, and the utilization rate of the cooling oil is increased.

2. According to the cooling structure of the oil-cooled motor, the plurality of slots are formed and are distributed at intervals along the circumferential direction of the first stator punching sheet, so that the entering of cooling oil is increased, the circulation of the cooling oil in a cooling flow passage is facilitated, and the heat exchange between the winding and the end part of the winding is increased.

3. According to the cooling structure of the oil-cooled motor, the slots are arranged perpendicular to the stator slots, so that the length of the slots can be reduced, and the length of the slots in the stator core is further reduced.

4. The cooling structure of the oil-cooled motor further comprises a connecting pipe, and the connecting pipe is connected with the opening and the oil return groove, so that cooling oil in the cooling flow channel can conveniently enter the oil return groove through the connecting pipe, and the next cooling circulation can be conveniently carried out.

This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the disclosure, nor is it intended to be used to limit the scope of the disclosure.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a cooling structure of an oil-cooled motor provided by the invention;

fig. 2 is a schematic structural diagram of a cooling structure of an oil-cooled motor provided by the present invention;

fig. 3 is a schematic structural diagram of a cooling structure of an oil-cooled motor provided by the present invention.

Description of reference numerals:

1-a shell; 2-a stator core; 21-a first stator punching sheet; 22-a second stator lamination; 23-slotting; 24-stator slots; 3-winding; 4-packaging the device; 5-opening the hole; 6-connecting pipe; 7-an oil return groove; 8-a rotating shaft; 9-rotor.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art can appreciate, the described embodiments can be modified in various different ways, without departing from the spirit or scope of the present disclosure. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the present disclosure, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "straight", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present disclosure. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.

Throughout the description of the present disclosure, it is to be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection, either mechanically, electrically, or otherwise in communication with one another; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or may comprise the first and second features being in contact, not directly, but via another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. The first feature being "under," "beneath," and "under" the second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the disclosure. To simplify the disclosure of the present disclosure, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present disclosure. Moreover, the present disclosure may repeat reference numerals and/or reference letters in the various examples for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.

The preferred embodiments of the present disclosure will be described below with reference to the accompanying drawings, and it should be understood that the preferred embodiments described herein are merely for purposes of illustrating and explaining the present disclosure and are not intended to limit the present disclosure.

Referring to fig. 1 to 3, the present invention provides a cooling structure of an oil-cooled motor, including: a housing 1; the stator core 2 is arranged in the shell 1, a slot 23 is formed in the stator core 2, and the slot 23 is communicated with a stator slot 24 in the stator core 2; the winding 3 is arranged in the stator slot 24 and is far away from one end of the slot 23; the packaging device 4 is arranged to wrap the winding 3, the packaging device 4 is used for sealing the stator slots 24, and the inner surface of the packaging device 4, the slots 23 and the stator slots 24 jointly form a cooling flow channel; and the oil return groove 7 is communicated with the cooling flow channel.

The stator core 2 is provided with the slot 23, the slot 23 is the slot 23 opened at the later stage, the slot 23 is communicated with the original stator slot 24 in the stator core 2, meanwhile, the winding 3 is arranged in the stator slot 24, and the packaging device 4 is utilized to wrap the two ends of the winding 3, so that the slot 24 is used for plugging the stator slot 24. The interior of the packaging device 4, the slot 23 and the stator slot 24 jointly form a cooling flow channel, when cooling oil is introduced into the cooling flow channel, the cooling oil flows to the end part of the winding 3 through the stator slot 24 under the action of pressure, the cooling oil at the end part of the winding 3 is filled in the end part of the whole winding 3 and the cooling flow channel under the action of pressure and gravity and flows through the surfaces of all the end parts of the winding 3 to fully exchange heat for the end parts of the winding 3 and the winding 3, and finally reaches the open hole 5 at the bottommost end of the gravity direction of the end part of the winding 3, and the cooling oil after heat exchange falls back to the oil return groove 7 under the action of gravity so as to carry out the next cooling circulation.

According to the cooling structure of the oil-cooled motor, the inner surface of the packaging device 4, the open groove 23 and the stator groove 24 form a cooling flow channel together, cooling oil can fully, comprehensively and uniformly flow through the end parts of the winding 3 and the winding 3 to fully cool the winding 3 and the end part of the winding 3, so that the heat dissipation uniformity is achieved, and the utilization rate of the cooling oil is increased.

In some optional embodiments, the stator core 2 includes a plurality of first stator laminations 21 and second stator laminations 22 stacked in sequence, and the slot 23 is disposed on the first stator laminations 21; the stator slots 24 are formed in the first stator lamination 21 and the second stator lamination 22.

In some optional embodiments, the number of the slots 23 is multiple, and the multiple slots 23 are distributed at intervals along the circumferential direction of the first stator punching sheet 21, so that the entry of cooling oil is increased, the circulation of the cooling oil in a cooling flow channel is facilitated, and further the heat exchange between the winding 3 and the end portion of the winding 3 is increased.

In the present embodiment, the slots 23 have five, and the five slots 23 are spaced and uniformly arranged along the circumferential direction of the first stator punching 21. For the stator slot 24 corresponding to the slot 23, the stator slot 24 of the first stator punching sheet 21 is not opened, and a closed type stator slot punching sheet is adopted at the position, so that the structural strength of the first stator punching sheet 21 is enhanced.

In alternative embodiments, the slots 23 are arranged perpendicular to the stator slots 24, so that the length of the slots 23, and thus the length of the slots 23 in the stator core 2, can be reduced.

Of course, the slots 23 can also be arranged obliquely to the stator slots 24, in particular, they can be arranged as desired.

In some alternative embodiments, the two encapsulation devices 4 are provided, and the encapsulation devices 4 are provided at both ends of the winding 3 and flush with the outer surface of the stator core 2. The winding 3 is wrapped by a packaging device 4, the packaging device 4 is used for sealing the stator slots 24, and the inner surface of the packaging device 4, the slots 23 and the stator slots 24 form a cooling flow channel together.

In this embodiment, the package device 4 is made of epoxy resin. The encapsulation device 4 made of epoxy resin has excellent physical mechanical and electrical insulation properties due to the excellent physical mechanical and electrical insulation properties of epoxy resin.

In some optional embodiments, the enclosure 4 and the housing 1 are provided with an opening 5, and the opening 5 is connected with the oil return groove 7. Through being equipped with trompil 5 on packaging hardware 4, simultaneously, also have on casing 1 and be equipped with trompil 5 for the coolant oil falls back to oil gallery 7 under the action of gravity, so that carry out the cooling cycle next time.

In some optional embodiments, the cooling structure of the oil-cooled motor further includes a connecting pipe 6, and the connecting pipe 6 connects the opening 5 and the oil return groove 7, so that the cooling oil in the cooling flow passage can enter the oil return groove 7 through the connecting pipe 6, and the next cooling cycle can be performed.

In some optional embodiments, the cooling structure of the oil-cooled motor further comprises a rotating shaft 8 and a rotor 9; the rotating shaft 8 is arranged in the shell 1, and two ends of the rotating shaft 8 extend out of the shell 1; rotor 9 cover establish with on the pivot 8, and be located in stator core 2, and with stator core 2 coaxial setting. In this embodiment, the rotating shaft 8 extends out of the two ends of the housing 1, which is the output end of the cooling motor.

The invention also provides an oil-cooled motor which comprises the cooling structure of the oil-cooled motor.

The invention further provides a vehicle comprising the oil-cooled motor.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.

Claims (10)

1. A cooling structure of an oil-cooled motor, comprising:

a housing (1);

the stator core (2) is arranged in the shell (1), a slot (23) is formed in the stator core (2), and the slot (23) is communicated with a stator slot (24) in the stator core (2);

the winding (3) is arranged in the stator slot (24) and is far away from one end of the slot (23);

the packaging device (4) is arranged to wrap the winding (3), the packaging device (4) is used for plugging the stator slots (24), and the inner surface of the packaging device (4), the slots (23) and the stator slots (24) jointly form a cooling flow channel;

and the oil return groove (7) is communicated with the cooling flow channel.

2. The cooling structure of the oil-cooled motor according to claim 1, wherein the stator core (2) comprises a plurality of first stator laminations (21) and second stator laminations (22) which are sequentially stacked, the slots (23) are formed in the first stator laminations (21), and the stator slots (24) are formed in the first stator laminations (21) and the second stator laminations (22).

3. The cooling structure of the oil-cooled motor according to claim 2, wherein the plurality of slots (23) are provided, and the plurality of slots (23) are spaced apart from each other in a circumferential direction of the first stator lamination (21).

4. A cooling structure of an oil-cooled machine according to any of claims 1-3, characterized in that the slots (23) are arranged perpendicular to the stator slots (24).

5. A cooling structure of an oil-cooled machine according to claim 4, characterized in that the encapsulation means (4) has two, which are provided at both ends of the winding (3) and flush with the outer surface of the stator core (2).

6. Cooling arrangement for an oil-cooled machine according to claim 5, characterized in that the encapsulation means (4) and the housing (1) are provided with openings (5), which openings (5) are connected to the oil return channel (7).

7. The cooling structure of the oil-cooled motor according to claim 6, further comprising a connection pipe (6), the connection pipe (6) connecting the opening (5) and the oil returning groove (7).

8. The cooling structure of the oil-cooled motor according to any one of claims 5 to 7, further comprising:

the rotating shaft (8) is arranged in the shell (1), and two ends of the rotating shaft (8) extend out of the shell (1);

and the rotor (9) is sleeved on the rotating shaft (8), is positioned in the stator core (2), and is coaxially arranged with the stator core (2).

9. An oil-cooled electric machine characterized by comprising the cooling structure of the oil-cooled electric machine of any one of claims 1 to 8.

10. A vehicle comprising the oil-cooled electric machine of claim 9.

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