Stator cooling oil ring structure and motor

Abstract

The utility model discloses a stator cooling oil ring structure and a motor. The stator cooling oil ring structure is arranged between a stator core and a motor end cover, an oil storage cavity is formed between a motor shell and a stator cooling oil ring, and the stator cooling oil ring structure comprises an end ring part which is provided with a plurality of teeth extending towards the central axis of the stator core, the teeth are provided with first holes spraying towards the inner layer of the winding and / or the middle layer of the winding. A plurality of second holes spraying towards the outer side of the winding are formed in the radial direction of the oil ring part; and the first hole and the second hole are communicated with the oil storage cavity. According to the utility model, the problem of poor cooling of the inner layer and the middle layer of the winding is solved; and the oil ring structure is integrated with the insulating end plate, so that the insulating property between the winding and the stator core is improved, and the oil ring structure is convenient to install.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a stator cooling oil ring structure and a motor. Background Art

[0002] As new energy vehicles have higher and higher demands on motor power density and motor efficiency, new energy vehicle drive motors are required to have higher peak torque and motor efficiency in a smaller volume. At present, there are two main cooling systems for new energy vehicle drive motors: oil cooling and water cooling. Oil cooling has better cooling performance than water cooling systems, so oil cooling is widely used in high power density motor systems. The general motor oil cooling system is mainly composed of oil rings, oil pipes, oil channels and other parts. The cooling of the motor stator end is mainly achieved by oil rings or oil pipes.

[0003] The oil ring in the prior art is generally installed on the motor housing, and the cooling oil can be directly sprayed onto the outer layer of the stator winding end, which has a good cooling effect on the outer side of the stator winding. However, for the inner and middle layer windings, it is often difficult for the cooling oil to contact due to the small winding gap, and the cooling effect is poor, resulting in a high temperature on the inside of the winding. In addition, the oil ring, as a unique part of the oil-cooled motor, increases the complexity of the system, and the installation and fixation of the oil ring is relatively difficult. Utility Model Content

[0004] The embodiments of the utility model provide a stator cooling oil ring structure and a motor to solve the problems that the existing oil ring cannot cool the inner layer of the winding and is difficult to install and fix.

[0005] According to one aspect of the present invention, a stator cooling oil ring structure is provided, wherein the stator cooling oil ring structure is arranged between the stator core and the motor end cover, and an oil storage cavity is formed between the motor housing and the stator cooling oil ring structure, and comprises:

[0006] An end ring portion, wherein the end ring portion is provided with a plurality of teeth extending toward the central axis of the stator core, and each of the teeth is provided with a first hole sprayed toward the inner layer of the winding and / or the middle layer of the winding;

[0007] An oil ring portion, wherein a plurality of second holes for spraying toward the outside of the winding are provided in the radial direction of the oil ring portion;

[0008] The first hole and the second hole are in communication with the oil storage chamber.

[0009] In some embodiments, the teeth abut against an end surface of the stator core and form a plurality of oil passages, each of which communicates with the oil storage cavity and the first hole.

[0010] In some embodiments, the number of the first holes on each of the teeth is several; and / or,

[0011] The second holes are arranged in a plurality of rows in the axial direction of the oil ring portion and are evenly distributed in the radial direction of the oil ring portion.

[0012] In some embodiments, a space for limiting the winding is formed between the plurality of teeth.

[0013] In some embodiments, the radial cross-section of the tooth is U-shaped, and the stator cooling oil ring structure is positioned and / or clamped on the end surface of the winding slot wall on the inner side of the stator core through the tooth.

[0014] In some embodiments, the end ring portion and the oil ring portion are integrally formed, detachably connected, or fixedly connected.

[0015] In some embodiments, the stator cooling oil ring structure is made of an electrically insulating material.

[0016] In some embodiments, an annular sealing ring is disposed on the outer side of the end of the oil ring portion away from the end ring portion.

[0017] In some embodiments, the oil ring portion is provided with a positioning portion at an inner side of an end portion away from the end ring portion.

[0018] According to another aspect of an embodiment of the utility model, a motor is provided, comprising a stator core, a winding, a motor housing and an end cover, wherein the winding is arranged in the stator core; it is characterized in that a stator cooling oil ring structure according to any one of the above-mentioned structures is respectively arranged on both axial side ends of the stator core, and the stator cooling oil ring structure is fixed between the stator core and the end cover.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] The stator cooling oil ring structure proposed in the embodiment of the utility model integrates the oil ring with the winding insulation end plate. On the one hand, it realizes the cooling of the inner, middle and outer layers (sides) of the stator winding through the design of the oil channel, the first hole and the second hole. On the other hand, it can increase the insulation between the winding and the iron core, thereby solving the problem of poor cooling of the inner and middle layers of the winding, and improving the insulation performance between the winding and the stator iron core and the convenience of oil ring installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a stator cooling oil ring structure provided by an embodiment of the utility model;

[0022] Figure 2 It is a top view schematic diagram of a stator cooling oil ring structure provided by an embodiment of the utility model;

[0023] Figure 3 It is a schematic diagram of the installation structure of the stator cooling oil ring structure and the stator core provided by an embodiment of the utility model;

[0024] Figure 4 This is a schematic diagram of the installation structure of the stator cooling oil ring structure and the winding provided by an embodiment of the utility model;

[0025] Figure 5 It is a structural schematic diagram of the position relationship of the above-mentioned components in the motor provided by one embodiment of the utility model.

[0026] Notes on the attached drawings:

[0027] 100. Stator cooling oil ring structure; 10. End ring part; 11. Tooth; 12. First hole; 13. First oil inlet; 20. Oil ring part; 21. Second hole; 22. Sealing ring; 23. Positioning part; 200. Stator core; 210. Oil inlet of oil storage chamber; 220. Winding slot; 230. Winding slot wall; 300. Winding. DETAILED DESCRIPTION

[0028] Many specific details are described in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation disclosed below.

[0029] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] In the description of the present invention, reference terms such as "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present invention.

[0032] The embodiment of the utility model discloses a stator cooling oil ring structure 100, combined with Figure 1-4As shown, the stator cooling oil ring structure 100 is arranged between the stator core and the end cover of the motor, and an oil storage cavity is formed between the motor housing and the stator cooling oil ring structure, including:

[0033] The end ring part 10 is provided with a plurality of teeth 11 extending toward the central axis of the stator core, combined with Figure 2 As shown, each of the teeth 11 is provided with a first hole 12 sprayed toward the inner side of the winding and the middle layer of the winding; optionally, the first hole 12 is inclined toward the inner layer or the middle layer of the winding;

[0034] An oil ring part 20, wherein a plurality of second holes 21 for spraying toward the outside of the winding are arranged in the radial direction of the oil ring part; optionally, the second holes 21 are arranged on the radial wall of the oil ring part and are evenly distributed;

[0035] The first hole 12 and the second hole 21 are connected to the oil storage chamber. Figure 1 and Figure 2 As shown, the first hole 21 is connected to the oil storage cavity through the oil passage formed between the tooth 11 and the end surface of the stator core 200, and the second hole 12 is directly connected to the oil storage cavity.

[0036] This embodiment can solve the problem of poor cooling of the inner and middle layers of the winding, and the oil ring structure integrates the insulating end plate, which not only increases the insulation performance between the winding and the stator core, but also ensures that the oil ring structure is easier to install.

[0037] In some embodiments, the tooth 11 abuts against an end surface of the stator core 200 , and a plurality of oil passages are formed between each tooth and the stator core, each of the oil passages being connected to the oil storage cavity and the first hole 12 .

[0038] Combination Figure 3 As shown, a first oil inlet 13 is provided at the bottom of the end ring portion 10 , and the first oil inlet 13 is an entrance of the oil passage connecting the oil storage cavity and the first hole 12 .

[0039] It should be noted that the oil storage chamber is provided with an oil inlet, which can be provided on the motor housing or the stator core. Figure 3 An oil storage cavity oil inlet 210 is provided on the end surface of the stator core 200 , and cooling oil is provided to the oil storage cavity through the oil storage cavity oil inlet 210 .

[0040] In some embodiments, the number of the first holes 12 on each of the teeth 11 is several. Optionally, two first holes 12 are respectively provided corresponding to the middle layer and the inner layer of the winding. Preferably, the first holes 12 are respectively provided obliquely toward the middle layer and the inner layer of the winding.

[0041] The second holes 21 may be arranged in several rows in the axial direction of the oil ring part 20 , and the second holes 21 in each row may have a different density. Optionally, the second holes 21 in each row may be evenly distributed in the radial direction of the oil ring part.

[0042] In some embodiments, in combination Figure 3 As shown, a space for limiting the winding 300 is formed between the multiple teeth 11. Furthermore, a corresponding multiple winding slots 220 are provided on the inner side surface of the stator core 200, and a winding slot wall 230 is provided between each of the winding slots 220.

[0043] In some embodiments, according to Figure 1 , Figure 3 and Figure 4 As shown, the radial cross section of the tooth 11 is U-shaped, and the stator cooling oil ring structure 100 is positioned or clamped on the end surface of the winding slot wall 230 on the inner side of the stator core through the tooth 11.

[0044] In some embodiments, the end ring portion 10 and the oil ring portion 20 are integrally formed, detachably connected or fixedly connected, wherein the integral forming may be injection molding, the detachable connection may be threaded connection, and the fixed connection includes welding, gluing, etc. Of course, the above embodiments may also adopt other equivalent connection methods.

[0045] In some embodiments, the stator cooling oil ring structure 100 is made of an electrically insulating material, such as rubber, silicone or plastic.

[0046] In some embodiments, in combination Figure 1-3 As shown, the oil ring part 20 is provided with an annular sealing ring 22 on the outer side of the end away from the end ring part 10. Optionally, there are multiple sealing rings to prevent the cooling oil in the oil storage cavity from overflowing from the top end cover.

[0047] In some embodiments, in combination Figure 3 As shown, the oil ring portion 20 is provided with a positioning portion 23 at the inner side of the end away from the end ring portion 10 , and the positioning portion 23 can be used for positioning when the stator cooling oil ring structure 100 is installed in the motor.

[0048] In summary, the stator cooling oil ring structure is proposed to have the following characteristics:

[0049] 1. The oil ring structure assembly consists of two parts, namely the insulating end ring part and the cooling oil ring part. The two parts are integrally injection molded or connected by other methods, such as bolt connection, welding, etc.

[0050] 2. The end plate is inserted into the winding slot through a U-shaped structure, and a part of it covers the end surface of the stator core. It forms a cooling oil channel with the surface of the core. The cooling oil flows through the oil channel to the oil injection holes of the winding slot and the tooth part to cool the inner and middle layers of the winding;

[0051] 3. The oil ring part surrounds the outside of the winding, and the oil ring part and the motor housing form an oil storage chamber (oil storage channel), and the oil storage chamber can be connected with the oil channel of the end ring part. A part of the cooling oil is sprayed out through the oil injection hole (second hole) of the oil ring part to cool the outer layer of the motor winding end.

[0052] The embodiments of the present invention have at least the following technical effects or advantages:

[0053] 1. Solved the problem of poor cooling of the inner and middle layers of the winding;

[0054] 2. The oil ring structure integrates the insulating end plate, which increases the insulation performance between the winding and the stator core and ensures the convenience of installation of the oil ring structure itself.

[0055] See also Figure 5 As shown, according to another aspect of the present invention, an electric motor is provided, the electric motor comprises a stator core 200, a winding 300, a motor housing (not shown) and an end cover (not shown), the winding 300 is arranged in the stator core 200; the stator cooling oil ring structure 100 according to any of the above embodiments is respectively arranged on the axial end portions of the stator core 200, the stator cooling oil ring structure 100 is installed and fixed between the stator core 200 and the end cover, and an oil storage cavity is formed between the motor housing and the stator cooling oil ring structure, the oil storage cavity is connected with the first hole 12 and the second hole 21 on the stator cooling oil ring structure 100, so as to spray cool the inner layer, the middle layer and the outer layer (side) of the winding 300 respectively.

[0056] It should be noted that although the utility model is disclosed as above in the form of a preferred embodiment, it is not intended to limit the utility model. Any technical personnel in this field may make possible changes and modifications without departing from the spirit and scope of the utility model. Therefore, the scope of protection of the utility model shall be based on the scope defined by the claims of the utility model.

Claims

1. A stator cooling oil ring structure, wherein the stator cooling oil ring structure is arranged between the stator core and the motor end cover, and an oil storage cavity is formed between the motor housing and the stator cooling oil ring structure, characterized in that: include: An end ring portion, wherein the end ring portion is provided with a plurality of teeth extending toward the central axis of the stator core, and each of the teeth is provided with a first hole sprayed toward the inner layer of the winding and / or the middle layer of the winding; An oil ring portion, wherein a plurality of second holes for spraying toward the outside of the winding are provided in the radial direction of the oil ring portion; The first hole and the second hole are in communication with the oil storage chamber.

2. The stator cooling oil ring structure according to claim 1, characterized in that: The teeth are in contact with the end surface of the stator core and a plurality of oil passages are formed thereon. Each of the oil passages is connected to the oil storage chamber and the second hole.

3. The stator cooling oil ring structure according to claim 1, characterized in that: The number of the first holes on each of the teeth is several; and / or, The second holes are arranged in a plurality of rows in the axial direction of the oil ring portion and are evenly distributed in the radial direction of the oil ring portion.

4. The stator cooling oil ring structure according to claim 1, characterized in that: A space for limiting the position of the winding is formed between the plurality of teeth.

5. The stator cooling oil ring structure according to claim 1, characterized in that: The radial cross section of the teeth is U-shaped, and the stator cooling oil ring structure is positioned and / or clamped on the end surface of the winding slot wall on the inner side of the stator core through the teeth.

6. The stator cooling oil ring structure according to claim 1, characterized in that: The end ring part and the oil ring part are integrally formed and detachably connected or fixedly connected.

7. The stator cooling oil ring structure according to any one of claims 1 to 6, characterized in that: The stator cooling oil ring structure is made of electrical insulating material.

8. The stator cooling oil ring structure according to any one of claims 1 to 6, characterized in that: The oil ring portion is provided with an annular sealing ring at the outer side of the end portion away from the end ring portion.

9. The stator cooling oil ring structure according to any one of claims 1 to 6, characterized in that: The oil ring portion is provided with a positioning portion at an inner side of an end portion away from the end ring portion.

10. A motor, comprising a stator core, a winding, a motor housing and an end cover, wherein the winding is arranged in the stator core; characterized in that: The stator cooling oil ring structure according to any one of claims 1 to 9 is respectively provided on both axial end portions of the stator core, and the stator cooling oil ring structure is fixed between the stator core and the end cover.

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