Motor rotor oil cooling structure and motor

Abstract

The utility model discloses a motor rotor oil cooling structure and a motor. The structure comprises a rotor shaft, a first cooling channel is arranged in the rotor shaft along the axial direction, and a second cooling channel is arranged on the rotor shaft along the circumferential direction; the squirrel cage rotor iron core assembly comprises a rotor iron core and a squirrel cage structure, a third cooling channel is formed in the matching surface of the rotor iron core and the rotor shaft in the axial direction, and cooling oil flows to the two ends of the rotor iron core through the third cooling channel; the oil guide plates are respectively arranged at the two ends of the rotor iron core and are respectively provided with an oil guide channel and a cooling oil outlet; a plurality of fourth cooling channels are arranged in the rotor core along the axial direction; and the fourth cooling channels are respectively communicated with the oil guide channels and the cooling oil outlets on the oil guide plates at the two ends of the rotor core. According to the utility model, an oil cooling loop is formed among the rotor shaft, the oil guide plate and the iron core, so that cooling oil flows through a serious heating position, the internal deformation of the rotor is reduced, and the problems of serious air gap reduction, chamber sweeping and the like are avoided.

Description

Technical Field

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

[0002] Existing methods for cooling squirrel-cage rotors in asynchronous motors do not yet offer a cooling oil circuit within the rotor. During high-speed operation, the motor generates significant heat at the mating surface between the shaft and the core, particularly in the middle of the mating surface. Without an effective heat sink, this area generates significant heat. Since this heat is difficult to dissipate outside the motor, significant deformation can occur at the mating surface, leading to a significant reduction in the air gap and motor bore erosion.

[0003] In addition, the core punching sheets of existing rotors are mostly composed of two or more silicon steel sheets, and multiple molds are required for mass production, which is very costly. Utility Model Content

[0004] The embodiment of the utility model provides a motor rotor oil cooling structure and a motor, so as to solve the technical problems such as deformation and bore scraping caused by the inability to effectively cool the mating surface between the rotating shaft and the iron core.

[0005] According to one aspect of an embodiment of the present invention, a motor rotor oil cooling structure is provided, comprising:

[0006] A rotor shaft, wherein the rotor shaft is a hollow shaft, a first cooling channel is axially provided inside the rotor shaft, a second cooling channel is circumferentially provided on the rotor shaft, the second cooling channel is arranged at an axially intermediate position between the mating surface of the rotor shaft and the rotor core, and the first cooling channel is communicated with the second cooling channel;

[0007] A squirrel cage rotor core assembly includes a rotor core and a squirrel cage structure. The rotor core has a third cooling channel axially defined on its mating surface with the rotor shaft. The third cooling channel communicates with the second cooling channel, and cooling oil flows through the third cooling channel to both ends of the rotor core.

[0008] Oil guide plates are respectively provided at both ends of the rotor core, and are respectively provided with an oil guide channel and a cooling oil outlet. The oil guide channel is provided on a side of the oil guide plate close to the rotor core and communicates with the third cooling channel. The cooling oil outlet passes through the oil guide plate and is used to discharge cooling oil flowing out of the rotor core.

[0009] A plurality of fourth cooling channels are axially arranged in the rotor core, and each fourth cooling channel is respectively connected to the oil guide channel and the cooling oil outlet on the oil guide plates at both ends of the rotor core.

[0010] In some embodiments, the oil guide plate includes a first oil guide plate, which is arranged at one end of the rotor core. The first oil guide plate includes a first oil guide channel, and the first oil guide channel includes a first oil guide groove and a second oil guide groove. The first oil guide groove is connected to the third cooling channel, and the second oil guide groove is connected to the first oil guide groove.

[0011] In some embodiments, a portion of the fourth cooling channel on the rotor core is connected to the second oil guide groove;

[0012] The oil guide plate includes a second oil guide plate, which is arranged at the other end of the rotor core. The second oil guide plate is provided with a second cooling oil outlet, which is communicated with the fourth cooling channel.

[0013] In some embodiments, the second oil guide plate further includes a second oil guide channel, the second oil guide channel includes a third oil guide groove and a fourth oil guide groove, the third oil guide groove is communicated with the third cooling channel, and the fourth oil guide groove is communicated with the third oil guide groove.

[0014] In some embodiments, another portion of a fourth cooling channel on the rotor core is in communication with the fourth oil guide groove, and the fourth cooling channel is also in communication with the first cooling oil outlet on the first oil guide plate.

[0015] In some embodiments, the second oil guide groove is an arc region segment with the center of the first oil guide plate as the center.

[0016] In some embodiments, the fourth oil guide groove is an arc region segment with the center of the second oil guide plate as the center.

[0017] In some embodiments, a radial cross-section of the third cooling channel is an arc-shaped groove or a square groove.

[0018] In some embodiments, a radial cross-section of the fourth cooling channel in the rotor core is an arc region segment with the central axis of the rotor core as the center.

[0019] According to another aspect of an embodiment of the present invention, a motor is provided, comprising a stator and a squirrel cage rotor, wherein the squirrel cage rotor is cooled using the motor rotor oil cooling structure according to any one of the above embodiments.

[0020] Compared with the prior art, the utility model has the following advantages:

[0021] The motor rotor oil cooling structure proposed in the embodiment of the present invention can form a cooling circuit within the rotating shaft, squirrel cage rotor core assembly, and oil guide plate, so that the cooling oil flows directly through the location where heat is severe, preventing heat from accumulating in this location for a long time, dissipating heat efficiently and quickly, reducing the problem of excessive deformation of the rotor caused by severe internal heating, and thus avoiding problems such as severe air gap reduction and motor bore scraping.

[0022] Furthermore, the rotor core disclosed in the embodiment of the present invention only requires one type of punching sheet and only requires a single mold for making the punching sheet, which can greatly reduce the cost of the rotor core mold and save the motor manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional schematic diagram of a motor rotor oil cooling structure provided by some embodiments of the present utility model;

[0024] Figure 2 (a) is a schematic structural diagram of a first oil guide plate provided in some embodiments of the present invention;

[0025] Figure 2 (b) is a cross-sectional view of a squirrel cage rotor core assembly provided by some embodiments of the present invention;

[0026] Figure 2 (c) is a cross-sectional view of a second oil guide plate provided in some embodiments of the present invention;

[0027] FIG3( a ) is a schematic diagram of the three-dimensional structure of a squirrel cage rotor core assembly provided in some embodiments of the present invention;

[0028] FIG3( b ) is a schematic diagram of the three-dimensional structure of a squirrel cage structure provided by some embodiments of the present invention;

[0029] FIG3( c ) is a schematic diagram of the three-dimensional structure of the rotor core viewed from one side according to some embodiments of the present invention;

[0030] FIG3( d ) is a schematic diagram of the three-dimensional structure of the rotor core viewed from the other side provided in some embodiments of the present invention;

[0031] FIG3( e ) is a schematic structural diagram of a rotor core provided in some embodiments of the present invention from a front view;

[0032] Figure 4 (a) A schematic diagram of the structure of the first oil guide plate in contact with the rotor core in some embodiments of the present invention;

[0033] Figure 4 (b) A schematic structural diagram of the side of the first oil guide plate not in contact with the rotor core provided by some embodiments of the present invention;

[0034] Figure 5(a) A schematic diagram of the structure of the second oil guide plate in contact with the rotor core in some embodiments of the present invention;

[0035] Figure 5 (b) Schematic diagram of the structure of the second oil guide plate provided in some embodiments of the present invention, which does not contact the rotor core.

[0036] Description of the accompanying drawings:

[0037] 1. Rotor shaft; 2. First oil guide plate; 3. Squirrel cage rotor core assembly, 31. Rotor core, 32. Squirrel cage structure; 4. Second oil guide plate; 5. First cooling channel; 6. Second cooling channel; 7. Third cooling channel; 8. First oil guide channel, 81. First oil guide groove, 82. Second oil guide groove; 9. Fourth cooling channel; 10. Second cooling oil outlet; 11. Second oil guide channel, 111. Third oil guide groove, 112. Fourth oil guide groove; 12. First cooling oil outlet. DETAILED DESCRIPTION

[0038] The following description sets forth many specific details to facilitate a thorough 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 scope of the present invention. Therefore, the present invention is not limited to the specific implementations disclosed below.

[0039] In the description of the present invention, it should be understood that descriptions involving orientations, 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. They 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. Therefore, they cannot be understood as limitations on the present invention.

[0040] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting 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.

[0041] In the description of the present invention, reference to terms such as "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means 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.

[0042] See also Figure 1-5 As shown, an embodiment of the present utility model discloses a motor rotor oil cooling structure, comprising:

[0043] The rotor shaft 1 is a hollow shaft. The hollow structure in the rotor shaft can be a through hole or a blind hole. A first cooling channel 5 is provided in the axial direction inside the rotor shaft, and a second cooling channel 6 is provided in the circumferential direction on the rotor shaft 1. Figure 1 As shown, the second cooling channel 6 is arranged in the middle of the axial direction between the mating surface of the rotor shaft 1 and the rotor core, ensuring uniform distribution of cooling oil flow and thus ensuring good heat dissipation. In addition, the first cooling channel 5 is connected to the second cooling channel 6. When the rotor shaft 1 rotates, the cooling oil in the first cooling channel 5 is affected by centrifugal force and is thrown into the second cooling channel.

[0044] It should be noted that if Figure 1 As shown, the cooling oil supply device can be assembled on the rotor shaft 1 in the direction of the arrow and connected to the first end of the first cooling channel 5. The cooling oil enters the hollow structure of the rotor shaft 1 along the direction of the arrow.

[0045] The squirrel cage rotor core assembly 3 includes a rotor core 31 and a squirrel cage structure 32. The rotor core 31 is provided with a plurality of third cooling channels 7 along the axial direction on the mating surface with the rotor shaft 1. The third cooling channels 7 are connected to the second cooling channels 6. Cooling oil flows through the third cooling channels 7 to both ends of the rotor core.

[0046] It should be noted that the specific structure of the third cooling channel 7 requires no special instructions; it only needs to allow cooling oil to flow from the second cooling channel. Any design structure for the cooling channel on the inner diameter surface of the squirrel-cage rotor core assembly 3 is within the scope of protection of this utility model. To reduce structural stress on the inner diameter surface of the core, the cross-section of the third cooling channel 7 can optionally be an arcuate groove structure. Furthermore, to ensure uniform and unobstructed flow of cooling oil from the second cooling channel 6 to the third cooling channel 7, the number of the two should be consistent; in terms of relative position, the third cooling channel should directly face the second cooling channel.

[0047] Combine Figure 3a 、 Figure 3b As shown, the squirrel cage rotor core assembly 3 includes a rotor core 31 and a squirrel cage structure 32 . The material of the squirrel cage structure 32 includes but is not limited to cast aluminum, cast copper, aluminum bars, copper bars, etc.

[0048] Oil guide plates (2, 4) are respectively arranged at both ends of the rotor core 31. The oil guide plates (2, 4) are respectively provided with oil guide channels (8, 11) and cooling oil outlets (10, 12). The oil guide channels (8, 11) are arranged on the side of the oil guide plates (2, 4) close to the rotor core and communicate with the third cooling channel 7; the cooling oil outlets (10, 12) penetrate the oil guide plates and are used to discharge the cooling oil flowing out of the rotor core 3. It should be pointed out that in order to ensure the assembly of the oil guide plates and make them close to the rotor core, the outer diameter of the oil guide plates should be smaller than the inner diameter of the squirrel cage rotor end ring, and a certain assembly margin should be ensured.

[0049] Among them, combined Figure 2 、 Figure 3c 、 Figure 3d and Figure 3e As shown, a plurality of axially arranged fourth cooling channels 9 are axially arranged in the rotor core 31 of the squirrel cage rotor core assembly 3, cooling oil flows through the fourth cooling channels 9 in opposite directions, and each axially arranged fourth cooling channel 9 is respectively connected to the oil guide channels (8, 11) and cooling oil outlets (10, 12) on the oil guide plates (2, 4) at both ends of the rotor core.

[0050] According to the above embodiments, the motor rotor oil cooling structure provided by the present invention can form a cooling circuit within the rotor shaft 1, the rotor core 31, and the oil guide plate, so that the cooling oil flows directly through the location where heat is most severe, thereby preventing heat from accumulating in this location for a long time, dissipating heat efficiently and quickly, and reducing the problem of excessive deformation of the rotor caused by severe internal heating, thereby avoiding problems such as severe reduction of the air gap and motor bore scraping.

[0051] In some embodiments, combined Figure 2 、 4 As shown, the oil guide plate includes a first oil guide plate 2, which is arranged at one end of the rotor core. The first oil guide plate 2 includes a first oil guide channel 8, and the first oil guide channel 8 includes a first oil guide groove 81 and a second oil guide groove 82. The first oil guide groove 81 is connected to the third cooling channel 7, and the second oil guide groove 82 is connected to the first oil guide groove 81.

[0052] It should be noted that the number of the first oil guide channels 8 is designed according to the needs. Figure 4 Two first oil-conducting channels 8 are shown in FIG.

[0053] It should be noted that, combined with Figure 1 and Figure 2As shown, the first oil guide groove 81 communicates with the left side of the third cooling channel 7 within the rotor core 31. The number of first oil guide grooves 81 can be half the number of the third cooling channels 7, and they are symmetrically arranged on the first oil guide plate 2. Cooling oil can flow through the third cooling channel 7 into the first oil guide groove 81. Then, within the first oil guide plate 2, the cooling oil can flow from the first oil guide groove 81 into the second oil guide groove 82.

[0054] In some embodiments, a portion of the fourth cooling channel 9 on the rotor core 31 is connected to the second oil guide groove 82; Figure 4 As shown, a fourth cooling channel 9 is axially defined in the rotor core 31. The front face of the first oil guide plate 2 is connected to the left end face of the rotor core 31, and the second oil guide groove 82 communicates with the fourth cooling channel 9. It should be noted that to ensure smooth flow of cooling oil from the second oil guide groove 82 into the fourth cooling channel 9, the arc shape of the second oil guide groove 82 and the center distance from the rotor axis must be the same.

[0055] Combine Figure 2 and Figure 4 As shown, the oil guide plate includes a second oil guide plate 4, which is arranged at the other end of the rotor core 31. The second oil guide plate 4 is provided with a second cooling oil outlet 10, which is communicated with the fourth cooling channel 9, thereby guiding the cooling oil out of the rotor core 31.

[0056] In some embodiments, combined Figure 4 As shown, the second oil guide plate 4 also includes a second oil guide channel 11, which includes a third oil guide groove 111 and a fourth oil guide groove 112. The third oil guide groove 111 is connected to the third cooling channel 7, and the fourth oil guide groove 112 is connected to the third oil guide groove 111.

[0057] In some embodiments, another portion of the fourth cooling channel 9 on the rotor core 31 is connected to the fourth oil guide groove 112, and then the fourth cooling channel of this portion is connected to the first cooling oil outlet 12 on the first oil guide plate 2, thereby guiding the cooling oil of this portion out of the rotor core 31.

[0058] Likewise, the fourth oil guiding groove 112 and the fourth cooling channel 9 have the same arc shape and the same center distance from the rotor axis.

[0059] The above describes the specific flow of cooling oil within one side of the rotor shaft 1, rotor core 31, first oil guide plate 2, and second oil guide plate 4. This can be described as follows: cooling oil supply device → first cooling channel → second cooling channel → third cooling channel → first oil guide channel → fourth cooling channel → second cooling oil outlet → exit from the rotor. The cooling oil flow on the other side of the rotor can be described as follows: cooling oil supply device → first cooling channel → second cooling channel → third cooling channel → first oil guide channel → fourth cooling channel → first cooling oil outlet → exit from the rotor. It should be noted that when the cooling oil flows from the first oil guide channel to the fourth cooling channel on the other side, it flows through two channels (180° apart) that are different from the aforementioned fourth cooling channel 9.

[0060] Therefore, in some optional embodiments, the second oil guide groove 82 is an arc area segment with the center of the first oil guide plate 2 as the center of the circle. Through the design of the arc segment, the cooling and heat dissipation of the oil guide plate are improved by the cooling oil, and the arc area segment corresponds to the arc shape of the fourth cooling channel.

[0061] Optionally, the arc angle of the arc region is 10-40 degrees, preferably 20-30 degrees.

[0062] In some optional embodiments, the fourth oil guide groove 112 is an arc segment with the center of the second oil guide plate as the center, and the arc of the arc segment is 10-40 degrees, preferably 20-30 degrees.

[0063] It should be noted that the above-mentioned specific angle settings must meet the requirements of mechanical strength and electromagnetic performance.

[0064] In some embodiments, the radial cross-section of the third cooling channel 7 is an arc-shaped groove or a square groove.

[0065] In some embodiments, the radial cross-section of the fourth cooling channel 9 axially arranged in the rotor core is an arc area segment with the central axis of the rotor core as the center. By setting the arc area segment, the cooling efficiency of the rotor core is improved, and the arc area segment corresponds to the arc area segments of the second and fourth oil guide grooves.

[0066] When those skilled in the art apply this cooling method to design the structure of an asynchronous motor, the number of the second cooling channel 6, the third cooling channel 7, the first oil guide channel 8, the fourth cooling channel 9, the second cooling oil outlet 10, the second oil guide channel 11, and the first cooling oil outlet 12 can all be reasonably set according to the actual project requirements, as long as it is ensured that the cooling oil can form a cooling circuit in the rotor core. It should be noted that when applying this cooling method to design the structure of an asynchronous squirrel cage rotor, in order to form a complete cooling circuit in the rotor, the number of the second cooling channels 6 is consistent with the number of the third cooling channels 7 and the fourth cooling channels 9; at the same time, the number of the first oil guide channel 8, the second cooling oil outlet 10, the second oil guide channel 11 and the first cooling oil outlet 12 is consistent, and each is half of the number of the second cooling channels 6, and this number can be odd or even. In other words, the number of the second cooling channels 6 and the number of the third cooling channels 7 and the fourth cooling channels 9 are all even numbers. Based on the above cooling structure, the interior of the rotor assembly, especially the Figure 2 The section shown and its vicinity are severely deformed due to heat, thereby avoiding problems such as extremely serious bore scraping caused by excessive deformation.

[0067] According to another aspect of an embodiment of the present invention, a motor is provided, which includes a stator and a squirrel cage rotor, wherein the squirrel cage rotor includes a squirrel cage rotor core assembly 3 and a rotor shaft 1, wherein the squirrel cage rotor is cooled using the motor rotor oil cooling structure according to any one of the above embodiments.

[0068] In summary, the motor rotor oil cooling structure disclosed in the above embodiments of the present invention can achieve the following technical effects:

[0069] The motor rotor oil cooling structure proposed in the embodiment of the present invention can form a cooling circuit inside the rotor shaft, squirrel cage rotor core, and oil guide plate, so that the cooling oil flows directly through the position where heat is seriously generated, thereby preventing heat from accumulating in this position for a long time, dissipating heat efficiently and quickly, reducing the problem of excessive deformation of the rotor caused by severe internal heating, and thus avoiding problems such as serious reduction of the air gap and motor bore scraping.

[0070] Furthermore, the rotor core in the embodiment of the present invention only requires one type of punching sheet and only requires a single mold for making the punching sheet, which can greatly reduce the cost of the rotor core mold and save the motor manufacturing cost.

[0071] It should be noted that although the present invention is disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.

Claims

1. A motor rotor oil cooling structure, characterized in that: The motor rotor oil cooling structure comprises: A rotor shaft, wherein the rotor shaft is a hollow shaft, a first cooling channel is axially provided inside the rotor shaft, a second cooling channel is circumferentially provided on the rotor shaft, the second cooling channel is arranged at an axially intermediate position between the mating surface of the rotor shaft and the rotor core, and the first cooling channel is communicated with the second cooling channel; A squirrel cage rotor core assembly includes a rotor core and a squirrel cage structure. The rotor core has a third cooling channel axially defined on its mating surface with the rotor shaft. The third cooling channel communicates with the second cooling channel, and cooling oil flows through the third cooling channel to both ends of the rotor core. Oil guide plates are respectively provided at both ends of the rotor core, and are respectively provided with an oil guide channel and a cooling oil outlet. The oil guide channel is provided on a side of the oil guide plate close to the rotor core and communicates with the third cooling channel. The cooling oil outlet passes through the oil guide plate and is used to discharge cooling oil flowing out of the rotor core. A plurality of fourth cooling channels are axially arranged in the rotor core, and each fourth cooling channel is respectively connected to the oil guide channel and the cooling oil outlet on the oil guide plates at both ends of the rotor core.

2. The motor rotor oil cooling structure according to claim 1, characterized in that: The oil guide plate includes a first oil guide plate, which is arranged at one end of the rotor core. The first oil guide plate includes a first oil guide channel, and the first oil guide channel includes a first oil guide groove and a second oil guide groove. The first oil guide groove is connected to the third cooling channel, and the second oil guide groove is connected to the first oil guide groove.

3. The motor rotor oil cooling structure according to claim 2, characterized in that: A portion of the fourth cooling channel on the rotor core is connected to the second oil guide groove; The oil guide plate includes a second oil guide plate, which is arranged at the other end of the rotor core. The second oil guide plate is provided with a second cooling oil outlet, which is communicated with the fourth cooling channel.

4. The motor rotor oil cooling structure according to claim 3, characterized in that: The second oil guide plate further includes a second oil guide channel, and the second oil guide channel includes a third oil guide groove and a fourth oil guide groove. The third oil guide groove is communicated with the third cooling channel, and the fourth oil guide groove is communicated with the third oil guide groove.

5. The motor rotor oil cooling structure according to claim 4, characterized in that: Another portion of the fourth cooling channel on the rotor core is communicated with the fourth oil guide groove, and the fourth cooling channel is also communicated with the first cooling oil outlet on the first oil guide plate.

6. The motor rotor oil cooling structure according to claim 2, characterized in that: The second oil guide groove is an arc region segment with the center of the first oil guide plate as the center of the circle.

7. The motor rotor oil cooling structure according to claim 4, characterized in that: The fourth oil guide groove is an arc region segment with the center of the second oil guide plate as the center of the circle.

8. The motor rotor oil cooling structure according to any one of claims 1 to 7, characterized in that: The radial cross section of the third cooling channel is an arc-shaped groove or a square groove.

9. The motor rotor oil cooling structure according to any one of claims 1 to 7, characterized in that: The radial cross section of the fourth cooling channel is an arc region segment with the central axis of the rotor core as the center.

10. A motor, characterized in that: The motor includes a stator and a squirrel cage rotor, wherein the squirrel cage rotor is cooled by using the motor rotor oil cooling structure according to any one of claims 1 to 9.

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