Cooling collar and electric machine

Abstract

This invention relates to the field of motor technology, specifically to a cooling ring and a motor. The cooling ring includes: a main body structure, which is annular, having an inner ring wall and an outer ring wall. The inner side of the main body structure is suitable for mounting a rotor. A cooling channel is provided between the inner and outer ring walls, extending axially along and penetrating the main body structure. In practical use, by introducing a cooling medium into the cooling channel, which is located between the stator and rotor, the cooling medium can simultaneously cool both the stator and rotor, ensuring a cooling effect. Furthermore, since no holes need to be drilled in the stator, electromagnetic performance is not affected, and excessive local iron loss is avoided, thus ensuring motor operating efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a cooling sleeve ring and electric machine. BACKGROUND

[0002] During the operation of the electric machine, the electric machine is affected by various losses, and the heat problem has always been a key and difficult problem in the design and development process. The higher the temperature of the electric machine, the greater the loss under the same current, the lower the efficiency of the electric machine, and even the electric machine cannot run for a long time. The stator winding is closed in the stator slot, and the heat dissipation is insufficient, and the heat is the most serious. In addition, the rotor surface is also affected by the wind friction loss, and it is difficult to dissipate. In terms of the prior art, the cooling of the stator generally adopts the method of embedding heat pipes in the winding for heat dissipation, or transmitting and dissipating heat through the shell containing the cooling flow channel, or directly ventilating the stator and winding in the shell. Correspondingly, the manufacturing process is complex, the cost is high, or the cooling effect is insufficient; the rotor is generally forcedly air-cooled through radial holes, and the effect is general and seriously affects the electromagnetic performance.

[0003] The prior art discloses a scheme of opening a large number of through holes in the axial and radial directions of the stator core yoke, and the air enters the shell from both sides to cool the whole electric machine, and then flows out from the middle hole of the shell. The scheme can achieve a certain degree of cooling of the stator and rotor, but the effect is very limited. On the one hand, the number of holes in the stator is large, the electromagnetic performance is poor, and the efficiency of the electric machine is seriously affected. On the other hand, the compressed air entering the shell is relatively dispersed, the actual effective cooling area of the stator and rotor is small, the cooling effect is not good, and the temperature rise problem of the stator and rotor of the electric machine cannot be solved. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the defects of the prior art that the cooling effect of the electric machine cooling scheme is not good and the holes are opened in the stator, which affects the electromagnetic performance, so as to provide a cooling sleeve ring and electric machine which can ensure the cooling effect and will not affect the electromagnetic performance.

[0005] To solve the above technical problems, the present application provides a cooling sleeve ring, which comprises: a main body structure, which is annular, the main body structure has an inner ring wall and an outer ring wall, the inner side of the main body structure is adapted to be provided with a rotor, a cooling flow channel is arranged between the inner ring wall and the outer ring wall, the cooling flow channel extends along the axial direction of the main body structure and penetrates through the main body structure.

[0006] Optionally, a plurality of bosses are uniformly and spaced apart in the circumferential direction of the outer edge of the main body structure, the number of the bosses is adapted to be consistent with the number of the slot openings of the stator core, the bosses extend along the axial direction of the main body structure, and the bosses are adapted to be embedded in the slot openings of the stator core.

[0007] Optionally, a plurality of first radial holes are arranged on the inner ring wall and communicate with the cooling flow channel;

[0008] And / or, the outer ring wall and / or the boss is provided with a plurality of second radial holes in communication with the cooling flow channel.

[0009] Optionally, the cooling flow channel comprises a first cooling flow channel and a second cooling flow channel spaced apart, the first radial hole is in communication with the first cooling flow channel, the second radial hole is in communication with the second cooling flow channel, the first cooling flow channel is adapted to pass the first cooling medium, and the second cooling flow channel is adapted to pass the second cooling medium.

[0010] Optionally, the first cooling flow channel comprises a plurality of first axial through holes uniformly distributed along the circumference of the main body structure, the first axial through holes extend along the axial direction of the main body structure, and each first axial through hole is in communication with the inner side of the inner ring wall through the first radial hole.

[0011] And / or, the second cooling flow channel comprises a plurality of second axial through holes uniformly distributed along the circumference of the main body structure, the second axial through holes extend along the axial direction of the main body structure, and each second axial through hole is in communication with the outer side of the outer ring wall through the second radial hole.

[0012] Optionally, the first axial through holes and the second axial through holes are distributed on the same circumference and are alternately and spaced apart along the circumference of the main body structure.

[0013] Optionally, the second axial through holes are arranged one-to-one with the bosses.

[0014] Optionally, the first cooling medium is gaseous, and the second cooling medium is gaseous or liquid.

[0015] Optionally, the cooling sleeve ring is made of an insulating, high-temperature-resistant and non-magnetic material.

[0016] The application also provides an electric machine, comprising: a machine shell; a stator core fixedly arranged in the machine shell, the stator core comprising a stator yoke portion and a stator tooth portion, a slot being formed between two adjacent stator tooth portions; a stator winding arranged in the slot; the cooling sleeve ring arranged on the inner side of the stator winding; a rotor arranged in the cooling sleeve ring and having an air gap between the inner ring wall; and an end cover fixedly arranged at both ends of the machine shell.

[0017] The technical scheme of the application has the following advantages:

[0018] The cooling sleeve provided by the application, in particular in use, is installed inside the stator, and the rotor is installed inside the main body structure, i.e. inside the inner ring wall, and the cooling medium is introduced into the cooling flow channel, and since the cooling flow channel is located between the stator and the rotor, the cooling medium can cool the stator and the rotor at the same time, ensuring the cooling effect, and since no hole is needed to be opened on the stator, the electromagnetic performance is not affected, and the local iron loss is not large, thereby ensuring the operation efficiency of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the specific embodiments or prior art description will be briefly introduced. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 The structure diagram of the cooling sleeve provided in embodiment 1 of the present application;

[0021] Figure 2 The left view of the cooling sleeve shown in Figure 1

[0022] Figure 3 The cross-sectional view of the cooling sleeve shown in Figure 1

[0023] Figure 4 The cross-sectional view of the cooling sleeve shown in Figure 1

[0024] Figure 5 The cross-sectional view of the motor provided in embodiment 2 of the present application.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] 1, cooling sleeve; 101, main body structure; 1011, inner ring wall; 10111, first radial hole; 1012, outer ring wall; 10121, second radial hole; 1013, first axial through hole; 1014, second axial through hole; 102, boss; 2, rotor; 3, stator core; 4, casing; 5, stator winding; 7, end cover. DETAILED DESCRIPTION

[0027] The technical solutions of the present application will be described below in conjunction with the drawings, and obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.​​​

[0028] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0031] Embodiment 1

[0032] The present embodiment provides a cooling sleeve 1.

[0033] In one embodiment, as shown in Figures 1 to 4 The cooling sleeve 1 includes a main structure 101, which is annular, and has an inner ring wall 1011 and an outer ring wall 1012, the inner side of the main structure 101 is adapted to be provided with a rotor 2, and a cooling flow channel is arranged between the inner ring wall 1011 and the outer ring wall 1012, which extends along the axial direction of the main structure 101 and penetrates through the main structure 101.

[0034] In this embodiment, specifically in use, the cooling sleeve 1 is installed on the inner side of the stator, and the rotor 2 is installed on the inner side of the main structure 101, i.e. the inner side of the inner ring wall 1011, and by introducing cooling medium into the cooling flow channel, since the cooling flow channel is located between the stator and the rotor 2, the cooling medium can cool the stator and the rotor 2 at the same time, ensuring the cooling effect, and since no hole needs to be opened on the stator, the electromagnetic performance will not be affected, and the local iron loss will not be large, thereby ensuring the operation efficiency of the motor.

[0035] On the basis of the above-mentioned embodiments, in a preferred embodiment, the plurality of bosses 102 are circumferentially and uniformly spaced along the outer wall of the main body structure 101, the number of the bosses 102 is adapted to be consistent with the number of the notches of the stator core 3, the bosses 102 extend along the axial direction of the main body structure 101, and the bosses 102 are adapted to be embedded in the notches of the stator core 3. In this embodiment, the stator winding 5 can be positioned in the notches of the stator core 3 by embedding the bosses 102 in the notches of the stator core 3, and at the same time, the cooling sleeve 1 is fixedly connected to the stator.

[0036] On the basis of the above-mentioned embodiments, in a preferred embodiment, a plurality of first radial holes 10111 are provided on the inner ring wall 1011 and are in communication with the cooling flow channel; and a plurality of second radial holes 10121 are provided on the outer ring wall 1012 and / or the bosses 102 and are in communication with the cooling flow channel. In this embodiment, the cooling medium can flow to the surface of the rotor 2 through the first radial holes 10111 to cool the surface of the rotor 2; and the cooling medium can contact the stator winding 5 and / or the inner side of the stator core 3 through the second radial holes 10121 to cool the stator winding 5 and / or the inner side of the stator core 3, so that the cooling medium can contact the rotor 2 and the stator to cool them, and the cooling effect is good. In an alternative embodiment, only the first radial holes 10111 are provided on the inner ring wall 1011 and are in communication with the cooling flow channel, and the second radial holes 10121 are not provided; in this embodiment, the cooling effect on the rotor 2 is better than that on the stator. In another alternative embodiment, only the second radial holes 10121 are provided on the outer ring wall 1012 and / or the bosses 102 and are in communication with the cooling flow channel, and the first radial holes 10111 are not provided; in this embodiment, the cooling effect on the stator is better than that on the rotor 2. In another alternative embodiment, neither the first radial holes 10111 nor the second radial holes 10121 are provided; the cooling medium cools the cooling sleeve 1 when passing through the cooling flow channel, and the cooling of the stator and the rotor 2 is achieved through the heat exchange between the cooling sleeve 1 and the stator and the rotor 2, but obviously, the cooling effect of this embodiment is not as good as that of the embodiment without the first radial holes 10111 and the second radial holes 10121.

[0037] In a preferred embodiment, a plurality of second radial holes 10121 are uniformly distributed along the axial direction of the bosses 102, and the second radial holes 10121 are also provided at both ends of the bosses 102 on the outer ring wall 1012.

[0038] On the basis of the above-mentioned embodiments, in a preferred embodiment, the cooling flow channel comprises a first cooling flow channel and a second cooling flow channel which are spaced apart, the first radial hole 10111 is in communication with the first cooling flow channel, the second radial hole 10121 is in communication with the second cooling flow channel, the first cooling flow channel is adapted to pass the first cooling medium, and the second cooling flow channel is adapted to pass the second cooling medium. In this embodiment, the cooling of the stator and the cooling of the rotor 2 are carried out respectively, the first cooling flow channel and the second flow channel do not affect each other, and it is beneficial to pass different cooling media for cooling. Of course, in an alternative embodiment, the cooling flow channel can only be provided with one annular flow channel, and the cooling flow channel is in communication with the first radial hole 10111 and the second radial hole 10121 at the same time. Obviously, in this embodiment, the cooling medium for cooling the stator and the cooling medium for cooling the rotor 2 are the same.

[0039] On the basis of the above-mentioned embodiments, in a preferred embodiment, the first cooling flow channel comprises a plurality of first axial through holes 1013 which are uniformly distributed along the circumference of the main body structure 101, the first axial through holes 1013 extend along the axial direction of the main body structure 101, and each first axial through hole 1013 is in communication with the inner side of the inner ring wall 1011 through the first radial hole 10111; the second cooling flow channel comprises a plurality of second axial through holes 1014 which are uniformly distributed along the circumference of the main body structure 101, the second axial through holes 1014 extend along the axial direction of the main body structure 101, and each second axial through hole 1014 is in communication with the outer side of the outer ring wall 1012 through the second radial hole 10121. In this embodiment, by uniformly distributing a plurality of first axial through holes 1013 along the circumference of the main body structure 101, and each first axial through hole 1013 being in communication with the inner side of the inner ring wall 1011 through the first radial hole 10111, it can be ensured that the first cooling medium can uniformly and sufficiently cool the rotor 2; by uniformly distributing a plurality of second axial through holes 1014 along the circumference of the main body structure 101, and each second axial through hole 1014 being in communication with the outer side of the outer ring wall 1012 through the second radial hole 10121, it can be ensured that the second cooling medium can uniformly and sufficiently cool the stator, especially the stator winding 5. In an alternative embodiment, only the first cooling flow channel comprises a plurality of first axial through holes 1013 which are uniformly distributed along the circumference of the main body structure 101, and the second cooling flow channel can be an annular flow channel. In another alternative embodiment, only the second cooling flow channel comprises a plurality of second axial through holes 1014 which are uniformly distributed along the circumference of the main body structure 101, and the first cooling flow channel can be an annular flow channel. In another alternative embodiment, the first cooling flow channel is an annular flow channel, and the second cooling flow channel is an annular flow channel, and the second cooling flow channel is located on the outer side of the first cooling flow channel.

[0040] On the basis of the above-mentioned embodiments, in a preferred embodiment, the first axial through holes 1013 and the second axial through holes 1014 are alternately and spacedly arranged on the same circumference of the main body structure 101. In this embodiment, since the first axial through holes 1013 and the second axial through holes 1014 are arranged on the same circumference, the thickness of the cooling sleeve ring 1 can be reduced to some extent, facilitating the installation of the cooling sleeve ring 1 between the stator and the rotor 2, and not affecting the electromagnetic force between the rotor 2 and the stator. Since the first axial through holes 1013 and the second axial through holes 1014 are alternately arranged, uniform cooling of the stator and the rotor 2 can be ensured. In an alternative embodiment, the number of the first axial through holes 1013 and the number of the second axial through holes 1014 can be inconsistent. In this embodiment, considering that the heat generation of the stator and the heat generation of the rotor 2 can be inconsistent, different numbers of the first axial through holes 1013 and the second axial through holes 1014 are arranged to cool the stator and the rotor 2 respectively, so as to make the cooling effect uniform. In another alternative embodiment, the first axial through holes 1013 and the second axial through holes 1014 can be arranged on different circumferences.

[0041] On the basis of the above-mentioned embodiments, in a preferred embodiment, the second axial through holes 1014 are arranged one-to-one corresponding to the bosses 102. In this embodiment, the cooling medium flowing through the second axial through holes 1014 contacts the stator winding 5 through the second radial holes 10121, and sufficiently cools the stator winding 5. In the prior art, the stator winding 5 is enclosed in the slot, and the heat dissipation is not sufficient, and the heat generation is the most serious. Therefore, the second axial through holes 1014 in this embodiment are mainly used for cooling the stator winding 5, which can effectively solve the problem of temperature rise of the motor stator. Of course, in other alternative embodiments, the number of the second axial through holes 1014 can be greater than the number of the bosses 102, and the stator tooth part can also be cooled in addition to the cooling of the stator winding 5.

[0042] On the basis of the above-mentioned embodiments, in a preferred embodiment, the first cooling medium is gaseous, and the second cooling medium is gaseous or liquid. Specifically, the first cooling medium is gaseous medium such as compressed air, oil gas, and oil mist. When the sealing between the cooling sleeve ring 1 and the stator is good, the second cooling medium is gaseous medium such as compressed air, oil gas, and oil mist, or non-conductive and non-corrosive liquid medium. When the sealing between the cooling sleeve ring 1 and the stator is not good, the second cooling medium is gaseous medium such as compressed air, oil gas, and oil mist.

[0043] On the basis of the above-mentioned embodiments, in a preferred embodiment, the cooling sleeve 1 is made of an insulating, high-temperature-resistant and non-magnetic material. In this embodiment, since the cooling sleeve 1 is made of a non-magnetic material, the strong suction force can be effectively prevented from affecting the rotor 2 during the assembly of the rotor 2, making the assembly process extremely convenient. The cooling sleeve 1 can be made of an insulating, temperature-resistant and non-magnetic material, such as a glass fiber or carbon fiber reinforced synthetic resin matrix composite material, a resin matrix of which is a thermosetting resin that can withstand high temperatures, or a plastic, nylon and chopped fiber composite material or other insulating, temperature-resistant and non-magnetic materials.

[0044] Embodiment 2

[0045] The present embodiment provides an electric machine.

[0046] In one embodiment, as shown in Figure 5 The electric machine includes a housing 4, a stator core 3, a stator winding 5, the cooling sleeve 1 provided in the above-mentioned embodiments, a rotor 2 and end covers 7. The stator core 3 is fixedly arranged in the housing 4, and the stator core 3 includes a stator yoke portion and stator tooth portions, and a slot is formed between adjacent two stator tooth portions; the stator winding 5 is arranged in the slot; the cooling sleeve 1 is arranged on the inner side of the stator winding 5; the rotor 2 is arranged in the cooling sleeve 1 and has an air gap with the inner ring wall 1011; and the end covers 7 are fixedly arranged at both ends of the housing 4.

[0047] In this embodiment, by arranging the cooling sleeve 1 between the stator and the rotor 2, the cooling medium can be introduced into the cooling channel through the two end covers 7, or through one end cover 7 and then flow out from the other end cover 7. After the cooling medium flows into the cooling channel, the stator and the rotor 2 can be cooled, effectively reducing the temperature of the inner side of the stator and the surface of the rotor 2, improving the upper limit of the operating performance of the electric machine, and without the need to open holes in the stator and the rotor 2, the electromagnetic performance is not affected, and the local iron loss is not large, thereby ensuring the operating efficiency of the electric machine. Moreover, since the cooling sleeve 1 is arranged between the stator and the rotor 2, the thicker the thickness of the cooling sleeve 1, the larger the air gap between the stator and the rotor 2, and therefore the arrangement of the cooling sleeve 1 increases the effective air gap between the stator and the rotor 2, which has the advantages of reducing the slot effect, low harmonic content, small vibration during operation of the electric machine, etc.

[0048] It should be noted that a liquid cooling flow channel can be arranged in the housing 4, and part of the stator core 3 can be cooled by means of the liquid cooling flow channel in the housing 4. The housing 4 can be provided with an opening, and the cooling medium can flow out from the opening.

[0049] In combination with Embodiment 1, in a preferred embodiment, the plurality of protrusions 102 are circumferentially and uniformly spaced along the outer periphery of the main body structure 101, the number of the protrusions 102 is adapted to be consistent with the number of the slots of the stator core 3, the protrusions 102 extend along the axial direction of the main body structure 101, and the protrusions 102 are embedded in the slots of the stator core 3. In this embodiment, the stator winding 5 can be positioned in the slots of the stator core 3 by embedding the protrusions 102 in the slots of the stator core 3, and at the same time, the cooling sleeve 1 is fixedly connected to the stator.

[0050] On the basis of the above-mentioned embodiments, in a preferred embodiment, gaps are provided between the winding copper wires of the stator winding 5. In this embodiment, the stator winding 5 is not in a monolithic structure, and gaps are provided between the winding copper wires, which can better reduce the temperature and dissipate the heat.

[0051] Obviously, the above-mentioned embodiments are only examples for the purpose of clear illustration, and are not intended to limit the embodiments. Based on the above-mentioned description, other different forms of changes or variations can be made by those skilled in the art. It is not necessary and impossible to enumerate all the embodiments. The changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A cooling collar characterized in that, The application relates to a cooling sleeve ring for a rotating electrical machine, comprising: a main body structure (101) which is annular, the main body structure (101) having an inner annular wall (1011) and an outer annular wall (1012), the inner side of the main body structure (101) being adapted to be provided with a rotor (2), a cooling flow channel being arranged between the inner annular wall (1011) and the outer annular wall (1012), the cooling flow channel extending along the axial direction of the main body structure (101) and penetrating through the main body structure (101), a plurality of bosses (102) being uniformly and circumferentially spaced apart along the outer periphery of the main body structure (101), the number of the bosses (102) being adapted to be consistent with the number of notches of a stator core (3), the bosses (102) extending along the axial direction of the main body structure (101), the bosses (102) being adapted to be embedded in the notches of the stator core (3), the cooling flow channel comprising a first cooling flow channel and a second cooling flow channel which are spaced apart, a first radial hole (10111) being in communication with the first cooling flow channel, a second radial hole (10121) being in communication with the second cooling flow channel, the first cooling flow channel being adapted to be filled with a first cooling medium, and the second cooling flow channel being adapted to be filled with a second cooling medium. A plurality of first radial holes (10111) are arranged on the inner annular wall (1011) and in communication with the first cooling flow channel; a plurality of second radial holes (10121) are arranged on the outer annular wall (1012) and / or the bosses (102) and in communication with the second cooling flow channel. The first cooling flow channel comprises a plurality of first axial through holes (1013) which are uniformly distributed along the circumferential direction of the main body structure (101), the first axial through holes (1013) extending along the axial direction of the main body structure (101), and each of the first axial through holes (1013) is in communication with the inner side of the inner annular wall (1011) through the first radial hole (10111). The second cooling flow channel comprises a plurality of second axial through holes (1014) which are uniformly distributed along the circumferential direction of the main body structure (101), the second axial through holes (1014) extending along the axial direction of the main body structure (101), and each of the second axial through holes (1014) is in communication with the outer side of the outer annular wall (1012) through the second radial hole (10121). The first axial through holes (1013) and the second axial through holes (1014) are arranged on the same circle and alternately and spaced apart along the circumferential direction of the main body structure (101).

2. The cooling collar of claim 1, wherein, The second axial through holes (1014) are arranged in one-to-one correspondence with the bosses (102).

3. The cooling collar of claim 1, wherein, The first cooling medium is gaseous, and the second cooling medium is gaseous or liquid.

4. Cooling collar according to any of claims 1-3, characterized in that The cooling sleeve ring is made of an insulating, high-temperature-resistant and non-magnetic material.

5. The cooling collar of any one of claims 1-3, wherein, The application further relates to a rotating electrical machine, comprising: a casing (4); a stator core (3) which is fixedly arranged in the casing (4), the stator core (3) comprising a stator yoke portion and a plurality of stator tooth portions, notches being formed between adjacent two stator tooth portions; a stator winding (5) which is arranged in the notches; and the cooling sleeve ring according to any one of claims 1-5 which is arranged at the inner side of the stator winding (5).

6. An electric machine characterized by ​ ​ ​ ​ ​ A rotor (2) is arranged in the cooling sleeve (1) and has an air gap with the inner ring wall (1011); End covers (7) are fixedly arranged at both ends of the machine shell (4).

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