Totally enclosed motor rotor cooling structure

Abstract

The application relates to the motor technical field and discloses a totally-enclosed motor rotor cooling structure. In the structure: a first annular cavity is formed between a first rotating disc and a first end cover, and the first end cover is provided with a first air inlet; a second annular cavity is formed between a second rotating disc and a second end cover, and the second end cover is provided with a second air inlet; a rotor iron core sleeve is installed on the outside of a rotor support, the rotor support is provided with a plurality of first axial ventilation holes, and the two ends of each first axial ventilation hole are respectively communicated with the first annular cavity and the second annular cavity; a stator assembly is provided with a second axial ventilation hole, one end of the second axial ventilation hole is communicated with the second annular cavity, and the other end is an outer circulation air outlet communicated with the outside of the motor. Through the totally-enclosed motor rotor cooling structure, the heat dissipation effect of the innermost part of the rotor iron core and the central rotating shaft can be improved, and the rotor iron core can be prevented from being polluted by the heat dissipation airflow.

Description

A fully enclosed motor rotor cooling structure Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a fully enclosed motor rotor cooling structure. Background Technology

[0002] A permanent magnet motor is a special type of motor with permanent magnet materials mounted on its rotor. To ensure that the motor is clean and trouble-free inside and to ensure the stability of the performance of the permanent magnet materials, the motor usually adopts a fully enclosed structure.

[0003] Compared to open-structure motors, fully enclosed-structure motors have lower heat dissipation and cooling efficiency. Without effective heat dissipation measures, or even if heat dissipation measures are ineffective, the motor temperature rises rapidly, affecting the magnetic properties of the rotor permanent magnet material. Higher temperatures can also cause changes in the magnetic properties of the permanent magnet, resulting in losses that cannot be recovered even after remagnetization, thus affecting the normal and safe operation of the motor.

[0004] Currently, most motors improve rotor heat dissipation efficiency by opening heat dissipation holes inside the rotor. However, this method has a very low heat dissipation effect on the innermost part of the rotor core and the central shaft, and the circulating airflow can easily contaminate the rotor core when passing through the ventilation holes inside the rotor core.

[0005] Therefore, how to improve the heat dissipation effect of the innermost part of the rotor core and the central shaft, and how to avoid the circulating airflow from easily contaminating the rotor core when passing through the internal ventilation holes, are technical problems that urgently need to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a fully enclosed motor rotor cooling structure that can improve the heat dissipation effect of the innermost part of the rotor core and the central shaft, and help to avoid contamination of the rotor core by the heat dissipation airflow.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A fully enclosed motor rotor cooling structure, characterized in that it includes a first rotating disk, a second rotating disk, a central rotating shaft, a rotor core, a rotor support, a first end cover, a second end cover, and a stator assembly, wherein:

[0009] The first end cover is mounted on the central rotating shaft via the first bearing. The first turntable is located inside the first end cover and is coaxially fixed to the central rotating shaft. A first annular cavity is formed between the first turntable and the first end cover. The first end cover is provided with a first air inlet that communicates with the first annular cavity.

[0010] The second end cover is mounted on the central rotating shaft via the second bearing. The second turntable is located inside the second end cover and is coaxially fixed to the central rotating shaft. A second annular cavity is formed between the second turntable and the second end cover. The second end cover is provided with a second air inlet that communicates with the second annular cavity.

[0011] The rotor support is sleeved on the outside of the central rotating shaft, and the rotor core is sleeved on the outside of the rotor support. The rotor support is provided with multiple first axial ventilation holes, and the two ends of each first axial ventilation hole are respectively connected to the first annular cavity and the second annular cavity.

[0012] The stator assembly is provided with a second axial ventilation hole. One end of the second axial ventilation hole is connected to the second annular cavity, and the other end is an external circulation air outlet connected to the outside of the motor.

[0013] In some embodiments of the present invention, the rotor support is a non-magnetic support.

[0014] In some embodiments of the present invention, a plurality of first axial ventilation holes are arranged sequentially along a circular trajectory.

[0015] In some embodiments of the present invention, the first end cover is provided with a first air outlet, and the distance between the midpoint of the first air outlet and the central axis of the central rotating shaft is greater than the distance between the midpoint of the first air inlet and the central axis of the central rotating shaft.

[0016] In some embodiments of the present invention, the first air inlet is equipped with a filter screen for filtering impurities in the ambient air.

[0017] In some embodiments of the present invention, a groove for mounting a first bearing is provided on the outer side of the first end cap;

[0018] The radially inner side of the first end cover has a space for mounting a bearing housing for the first bearing, and the first bearing is mounted on the bearing housing.

[0019] In some embodiments of the present invention, a conical air guide surface coaxial with the first bearing is provided on the inner side of the first end cover. The large diameter end of the conical air guide surface is connected to the first air inlet, and the small diameter end of the conical air guide surface is axially aligned with the port of the first axial ventilation hole. The bottom of the outer surface of the bearing seat is a conical air guide surface.

[0020] In some embodiments of the present invention, a second air outlet communicating with the first axial ventilation hole is provided on the side of the second turntable near the second end cover. Air discharged through the second air outlet merges with air entering through the second air inlet to enter the second annular cavity.

[0021] In some embodiments of the present invention, a fan blade is provided on the side of the second turntable near the second end cover. The fan blade is used to promote the rapid outflow of air in the first axial ventilation hole and to merge with the airflow entering the second annular cavity through the second air inlet.

[0022] In some embodiments of the present invention, the stator assembly includes a stator core and a housing, wherein the housing is fitted over the outside of the stator core, and a second axial ventilation hole is formed between the two.

[0023] As can be seen from the above technical solution, in the fully enclosed motor rotor cooling structure provided by the present invention, the first air inlet, the first annular cavity, the first axial ventilation hole, the second annular cavity, and the second axial ventilation hole are sequentially connected to form an external circulation air cooling path. Since the heat dissipation airflow in this path passes through the axial ventilation holes of the rotor support, that is, flows through the central hole of the rotor core, without passing through the permanent magnets of the rotor core, it can avoid contaminating the rotor core with the heat dissipation airflow, and achieve a good cooling effect on the innermost part of the rotor core and the central shaft, which is beneficial to improving the overall heat dissipation efficiency of the motor.

[0024] In addition, since the airflow in this path passes through the second axial ventilation hole of the stator assembly, it can also play a certain role in heat dissipation for the rotor core and stator assembly. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 is an isometric view of the rotor support provided in an embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of the external circulation air cooling path provided in an embodiment of the present invention.

[0028] Wherein, 1 is the first turntable, 2 is the second turntable, 3 is the central shaft, 4 is the rotor core, 5 is the rotor support, 6 is the first axial ventilation hole, 7 is the first end cover, 8 is the first air inlet, 9 is the first bearing, 10 is the second end cover, 11 is the second air inlet, 12 is the second bearing, 13 is the stator core, 14 is the second axial ventilation hole, 15 is the first air outlet, 16 is the fan blade, 17 is the second air outlet, 18 is the permanent magnet, 19 is the mesh cover, 20 is the housing; 100 is the first annular cavity, and 200 is the second annular cavity. Detailed Implementation

[0029] This invention discloses a fully enclosed motor rotor cooling structure, which can improve the heat dissipation effect of the innermost part of the rotor core and the central shaft, and helps to avoid contamination of the rotor core by the heat dissipation airflow.

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please refer to Figures 1 and 2. The fully enclosed motor rotor cooling structure provided in this embodiment of the invention includes a first rotating disk 1, a second rotating disk 2, a central rotating shaft 3, a rotor core 4, a rotor support 5, a first end cover 7, a second end cover 10, and a stator assembly. Wherein:

[0032] The first end cover 7 is mounted on the central rotating shaft 3 via the first bearing 9. The first turntable 1 is located inside the first end cover 7 and is coaxially fixed to the central rotating shaft 3. A first annular cavity 100 is formed between the first turntable 1 and the first end cover 7. The first end cover 7 is provided with a first air inlet 8 that communicates with the first annular cavity 100.

[0033] The second end cover 10 is mounted on the central rotating shaft 3 via the second bearing 12. The second turntable 2 is located inside the second end cover 10 and is coaxially fixed to the central rotating shaft 3. A second annular cavity 200 is formed between the second turntable 2 and the second end cover 10. The second end cover 10 is provided with a second air inlet 11 that communicates with the second annular cavity 200.

[0034] The rotor support 5 is sleeved on the outside of the central rotating shaft 3, and the rotor core 4 is sleeved on the outside of the rotor support 5. The rotor support 5 is provided with a plurality of first axial ventilation holes 6, which are arranged sequentially along a circular trajectory (that is, the plurality of first axial ventilation holes 6 are arranged sequentially in a ring around the central axis of the rotor support 5), and the two ends of each first axial ventilation hole 6 are respectively connected to the first annular cavity 100 and the second annular cavity 200.

[0035] The stator assembly is provided with a second axial ventilation hole 14. One end of the second axial ventilation hole 14 is connected to the second annular cavity 200, and the other end is an external circulation air outlet connected to the outside of the motor.

[0036] As can be seen from the principle, in the fully enclosed motor rotor cooling structure provided in this embodiment of the invention, the first air inlet 8, the first annular cavity 100, the first axial ventilation hole 6, the second annular cavity 200, and the second axial ventilation hole 14 are sequentially connected to form an external circulation air cooling path. Since the heat dissipation airflow in this path passes through the axial ventilation hole 6 of the rotor support 5, that is, flows through the central hole of the rotor core 4, without passing through the permanent magnet 18 of the rotor core, it can avoid contamination of the rotor core 4 by the heat dissipation airflow, and has a good cooling effect on the innermost part of the rotor core 4 and the central shaft 3, reducing the rotor temperature and improving the overall heat dissipation efficiency of the motor.

[0037] In addition, since the airflow in this path passes through the second axial ventilation hole 14 of the stator assembly, it can also play a certain role in heat dissipation for the rotor core 4 and the stator assembly.

[0038] In addition, since the second annular cavity 200 is close to the bearing, it helps to reduce the bearing temperature, thereby further improving the overall heat dissipation efficiency of the motor.

[0039] Specifically, rotor support 5 is a non-magnetic support. It can isolate the magnetic circuit, prevent the adsorption of ferromagnetic impurities, and keep the ventilation holes unobstructed. For example, it can be made of non-magnetic metal or non-magnetic plastic, etc.

[0040] Specifically, the inner wall of the rotor support 5 is provided with a first keyway for installing a first positioning key, so as to circumferentially position the central shaft 3 and the rotor support 5 by means of the first positioning key to prevent slippage; the outer wall of the rotor support 5 is provided with a second keyway for installing a second positioning key, so as to circumferentially position the rotor core 4 and the rotor support 5 by means of the second positioning key to prevent slippage. Preferably, the first keyway is provided between two adjacent sets of first axial ventilation holes 6, and the second keyway is provided between another two adjacent sets of first axial ventilation holes 6.

[0041] Please refer to Figure 1. In a specific embodiment, the rotor support 5 has a total of twelve first axial ventilation holes 6, which can be arranged in groups of three or two. The spacing between groups is relatively large compared to the distance between two adjacent first axial ventilation holes 6 in the same group.

[0042] The aforementioned first air outlet 15 can be disposed on the first end cover 7, the second end cover 10, or the stator assembly. In some embodiments of the present invention, the first air outlet 15 is disposed on the first end cover 7, and the distance between the midpoint of the first air outlet 15 and the central axis of the central rotating shaft 3 is greater than the distance between the midpoint of the first air inlet 8 and the central axis of the central rotating shaft 3. Alternatively, in other specific embodiments, the distance between the midpoint of the first air inlet 8 and the central axis of the central rotating shaft 3 may be less than the distance between the midpoint of the first air outlet 15 and the central axis of the central rotating shaft 3.

[0043] Furthermore, multiple first air inlets 8 and multiple first air outlets 15 are provided, and the multiple first air inlets 8 and multiple first air outlets 15 are distributed in a ring matrix, all surrounding the radial outer side of the first bearing 9. This helps to improve the heat dissipation effect of the first bearing 9.

[0044] To reduce the amount of debris entering the first air inlet 8, the first air inlet 8 is also equipped with a mesh cover 19.

[0045] Specifically, referring to Figure 2, the outer side of the first end cover 7 is provided with a groove for mounting the first bearing 9; the inner side of the first end cover 7 is provided with a conical air guide surface coaxial with the first bearing 9. The large-diameter end of the conical air guide surface is connected to the first air inlet 8, and the small-diameter end of the conical air guide surface is axially aligned with the port of the first axial ventilation hole 6. Thus, through this conical air guide surface, part of the airflow entering from the first air inlet 8 can be smoothly guided into the first axial ventilation hole 6, forming the aforementioned external circulation air cooling path. Moreover, since the first bearing 9 is very close to the conical air guide surface, the first bearing 9 can obtain a good heat dissipation effect through the aforementioned external circulation air cooling path. The airflow passing through the first bearing 9 helps to reduce the temperature of the first bearing 9.

[0046] Specifically, as shown in Figure 2, the second turntable 2 has a second air outlet 17 on the side near the second end cover 10, which communicates with the first axial ventilation hole 6. The air discharged through the second air outlet 17 merges with the air entering through the second air inlet 11 to enter the second annular cavity 200. Since the second air outlet 17 is located close to the second bearing, it can effectively dissipate heat from the second bearing.

[0047] Specifically, the distances from the side of the second air outlet 17 near the center of rotation to the central axis of the central rotating shaft 3, the distances from the second air inlet 11 to the central axis of the central rotating shaft 3, and the distances from the first axial ventilation hole 6 to the central axis of the central rotating shaft 3 decrease sequentially. That is, the second air outlet 17 is located radially outside the second air inlet 11, and the outlet of the first axial ventilation hole 6 is located radially inside the second air inlet 11. Due to the specific structural design of the second air outlet 17, during its rotation, it can draw airflow near the second air inlet 11 and near the outlet of the first axial ventilation hole 6. This facilitates the entry of air outside the second end cover 10 into the second annular cavity through the second air inlet 11 and then out through the second axial ventilation hole 14; it also facilitates the entry of airflow from the first axial ventilation hole 6 into the second annular cavity and then out through the second axial ventilation hole 14.

[0048] Furthermore, a fan blade 16 is provided on the side of the second turntable 2 near the second end cover 10. The fan blade 16 is used to promote the convergence of the airflow from the second air outlet 17 with the airflow entering the second annular cavity 200 through the second air inlet 11.

[0049] Specifically, as shown in Figure 2, the fan blade 16 is located radially inside the second air inlet 11 and radially outside the first axial ventilation hole 6. Due to the specific structural design of the fan blade 16, it can draw airflow into the first axial ventilation hole 6 during rotation. It should be noted that without the fan blade 16, the drawing effect of the second air outlet 17 is mainly applied to the second air inlet 11, and its effect on the airflow into the first axial ventilation hole 6 is relatively small, resulting in relatively poor cooling of the rotor core 4, the first bearing 9, and the second bearing 12.

[0050] The stator assembly includes a stator core 13 and a housing 20, wherein the housing 20 is fitted around the outside of the stator core 13, forming the second axial ventilation hole 14 between them. Specifically, the second axial ventilation hole is located on the outer periphery of the stator core, or on the inner wall of the housing, or a portion of the second axial ventilation hole is located on the outer periphery of the stator core and a portion is located on the inner wall of the housing. The housing and stator core are installed by welding, or by bolt connection, etc.

[0051] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0052] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0053] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fully enclosed motor rotor cooling structure, characterized in that, The device includes a first turntable (1), a second turntable (2), a central shaft (3), a rotor core (4), a rotor support (5), a first end cover (7), a second end cover (10), and a stator assembly, wherein: the first end cover (7) is located at the end of the motor away from the output end of the central shaft (3), the first end cover (7) is mounted on the central shaft (3) by a first bearing (9), the first turntable (1) is located inside the first end cover (7) and is coaxially fixed to the central shaft (3), and a first annular cavity (100) is formed between the first turntable (1) and the first end cover (7). The first end cap (7) is provided with a first air inlet (8) communicating with the first annular cavity (100); the second end cap (10) is located at one end of the motor near the output end of the central rotating shaft (3), the second end cap (10) is mounted on the central rotating shaft (3) by a second bearing (12), the second turntable (2) is located inside the second end cap (10) and is coaxially fixed to the central rotating shaft (3), a second annular cavity (200) is formed between the second turntable (2) and the second end cap (10), and the second end cap (10) is provided with an air inlet (8) communicating with the second annular cavity (200). 0) The second air inlet (11) is connected; the rotor bracket (5) is sleeved on the outside of the central rotating shaft (3), the rotor core (4) is sleeved on the outside of the rotor bracket (5), the rotor bracket (5) is provided with a plurality of first axial ventilation holes (6), and the two ends of each first axial ventilation hole (6) are respectively connected to the first annular cavity (100) and the second annular cavity (200); the stator assembly is provided with a second axial ventilation hole (14), one end of the second axial ventilation hole (14) is connected to the second annular cavity (200), and the other end is connected to the motor. An external circulation air outlet is connected to the outside; the first air inlet (8), the first annular cavity (100), the first axial ventilation hole (6), the second annular cavity (200), and the second axial ventilation hole (14) are connected in sequence to form an external circulation air cooling path; the second turntable (2) is provided with a second air outlet (17) connected to the first axial ventilation hole (6) on the side near the second end cover (10), and the air discharged through the second air outlet (17) merges with the air entering through the second air inlet (11) to enter the second annular cavity (200).

2. The fully enclosed motor rotor cooling structure according to claim 1, characterized in that, The rotor support (5) is a non-magnetic support.

3. The fully enclosed motor rotor cooling structure according to claim 1, characterized in that, Multiple first axial ventilation holes (6) are arranged sequentially along a circular trajectory.

4. The fully enclosed motor rotor cooling structure according to claim 1, characterized in that, The first end cap (7) is provided with a first air outlet (15). The distance between the midpoint of the first air outlet (15) and the central axis of the central rotating shaft (3) is greater than the distance between the midpoint of the first air inlet (8) and the central axis of the central rotating shaft (3).

5. The fully enclosed motor rotor cooling structure according to claim 1, characterized in that, The first air inlet (8) is equipped with a filter screen (19) to filter environmental air impurities.

6. The fully enclosed motor rotor cooling structure according to claim 1, characterized in that, The outer side of the first end cover (7) is provided with a groove for installing the first bearing (9); the radial inner side of the first end cover (7) has a space for a bearing seat for installing the first bearing (9), and the first bearing (9) is installed on the bearing seat.

7. The fully enclosed motor rotor cooling structure according to claim 1, characterized in that, The inner side of the first end cover (7) is provided with a conical air guide surface coaxial with the first bearing (9). The large diameter end of the conical air guide surface is connected to the first air inlet (8), and the small diameter end of the conical air guide surface is axially aligned with the port of the first axial ventilation hole (6). The bottom of the outer surface of the bearing seat is a conical air guide surface.

8. The fully enclosed motor rotor cooling structure according to claim 5, characterized in that, The second turntable (2) is provided with a fan blade (16) on the side near the second end cover (10). The fan blade (16) is used to promote the rapid flow of air in the first axial ventilation hole (6) and merge with the air flow that enters the second annular cavity through the second air inlet (11).

9. The fully enclosed motor rotor cooling structure according to claim 1, characterized in that, The stator assembly includes a stator core (13) and a housing (20), wherein the housing (20) is fitted on the outside of the stator core (13), and a second axial ventilation hole (14) is formed between the two.

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