Motor

Abstract

The invention relates to the technical field of aerospace, in particular to a motor. The stator assembly is arranged on the peripheral side of the rotating shaft in a sleeving mode and comprises a stator support, the stator support is provided with a first end and a second end which are oppositely arranged in the axial direction of the stator support, and the first end of the stator support is connected with the rotating shaft through a first bearing; the rotor assembly comprises a rotor, a first fan and a second fan, the rotor is arranged on the peripheral side of the stator assembly in a sleeving mode, the first fan is connected with the end, close to the first bearing, of the rotating shaft, and the second fan is connected with the second end of the stator support through a second bearing; and the corresponding stator assembly and / or rotor assembly between the first fan and the second fan form a ventilation channel. The cooling effect of the motor is improved through a forced air cooling mode, the rotating shaft is short, the structure is simple, and the weight of the whole motor is light.

Description

Technical Field

[0001] The present application relates to the field of aerospace technology, and in particular to a motor. Background Art

[0002] The external rotor drive motor used in the aerospace field has an internal structure mainly including a rotating shaft, a stator, an end cover, a rotor, etc. High-power drive motors usually use liquid cooling for heat dissipation. The shaft system mostly adopts an internal double bearing or an internal and external triple bearing method. The rotating shaft is long, the overall structure is complex, and the weight is heavy. Summary of the Invention

[0003] The present application provides a motor that improves the heat dissipation effect of the motor through a forced air cooling method, and has a short rotating shaft, a simple structure, and a light weight of the entire motor.

[0004] In the first aspect, the present application provides a motor, comprising: a rotating shaft; a stator assembly, which is sleeved on the outer peripheral side of the rotating shaft, the stator assembly including a stator bracket, the stator bracket having a first end and a second end arranged opposite to each other along its own axial direction, the first end of the stator bracket being connected to the rotating shaft through a first bearing; and a rotor assembly, comprising a rotor, a first fan and a second fan, the rotor being sleeved on the outer peripheral side of the stator assembly, the first fan being connected to an end of the rotating shaft adjacent to the first bearing, the second fan being connected to the second end of the stator bracket through the second bearing, and ventilation ducts are formed between the corresponding stator assemblies and / or rotor assemblies between the first fan and the second fan.

[0005] In one possible implementation, the first fan is a centrifugal fan, which includes a first sleeve and a second sleeve arranged coaxially and a first bracket connected between the first sleeve and the second sleeve. The first bracket includes a plurality of connecting rods arranged at intervals along the outer circumference of the first sleeve. The second sleeve has a plurality of guide holes arranged at intervals along its own circumference, and the center line of the guide hole is set at a preset angle to the radial direction of the second sleeve.

[0006] In one possible implementation, the second fan is an axial flow fan, a fixing hole is provided at its rotation center, the fixing hole is fixedly connected to the outer ring of the second bearing, a plurality of through holes are provided between the fixing hole and the outer peripheral surface of the second fan, the plurality of through holes are arranged at intervals along the circumference of the second fan, and a rotatable blade is provided in each through hole.

[0007] In one possible implementation, the rotating shaft is provided with a first shoulder, a second shoulder and an annular groove along its own axial direction, which are distributed in sequence and at intervals. The first shoulder is connected to the first fan by a fastener, one end of the first bearing abuts against the second shoulder, and the other end of the first bearing abuts against a retaining ring sleeved on the annular groove.

[0008] In a possible implementation, the motor further includes a locking nut, which is sleeved on the outer circumference of the rotating shaft and pressed onto the retaining ring.

[0009] In a possible implementation, the stator bracket is provided with a first positioning hole and a second positioning hole in sequence along its own axial direction, the first positioning hole is fixedly connected to the outer ring of the first bearing, and a flange is provided between the second positioning hole and the end of the rotating shaft away from the first bearing.

[0010] In one possible implementation, the stator assembly further includes a stator core and a plurality of stator windings located on the outer peripheral side of the stator bracket. The stator core is provided with a plurality of stator holes distributed at intervals along its circumference. Each stator winding is wound around a stator hole, and the ventilation duct includes a gap formed between each two adjacent stator windings.

[0011] In a possible implementation, the stator core is further provided with a plurality of ventilation holes along its circumference, and the ventilation holes are provided closer to the rotating shaft than the stator holes, and the ventilation duct further includes a plurality of ventilation holes.

[0012] In a possible implementation, the rotor includes a rotor support and a plurality of magnets disposed on the rotor support, the plurality of magnets are spaced apart along the circumference of the rotor support, and the ventilation duct includes a first ventilation duct formed between every two adjacent magnets.

[0013] In a possible implementation, the ventilation duct further includes a second ventilation duct formed between the stator core and the plurality of magnetic steels.

[0014] According to the motor provided in the present application, a first fan and a second fan are respectively arranged at the axial ends of the rotating shaft, and a ventilation duct is formed between the corresponding stator assembly and / or rotor assembly of the first fan and the second fan, so that sufficient cooling air volume can be provided for the motor through a forced air cooling method; in addition, the rotating shaft is relatively short, and the first bearing serves as the main load-bearing bearing, which can provide axial force and radial force support for the rotating shaft, and the second bearing can improve the stiffness of the rotor. The structure is simple and the weight of the whole machine is light. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0016] Figure 1 A schematic cross-sectional view of a motor according to an embodiment of the present invention; Figure 2 for Figure 1 A schematic structural diagram of a rotor assembly in the motor shown; Figure 3 for Figure 2 A schematic structural diagram of a first fan in the rotor assembly shown; Figure 4 for Figure 2 A schematic structural diagram of a second fan in the rotor assembly shown; Figure 5 for Figure 1 A schematic structural diagram of the rotating shaft in the motor shown; Figure 6 for Figure 1 Schematic diagram of the structure of the stator core in the motor shown.

[0017] The reference numerals are as follows: 100. Motor; 1. Rotating shaft; 11. First shaft shoulder; 12. Second shaft shoulder; 13. Annular groove; 14. Fastener; 15. Retaining ring; 16. Lock nut; 17. Flange; 2. Stator assembly; 21. Stator bracket; 211. First positioning hole; 212. Second positioning hole; 22. Stator core; 221. Stator hole; 222. Ventilation hole; 3. Rotor assembly; 31. First fan; 311. First sleeve; 312. Second sleeve; 313. Connecting rod; 314. Air guide hole; 32. Second fan; 321. Fixing hole; 322. Through hole; 323. Blade; 33. Rotor; 331. Rotor bracket; 332. Magnet; 41. First bearing; 42. Second bearing. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions of this application in conjunction with the embodiments. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0019] Figure 1 A schematic cross-sectional view of a motor according to an embodiment of the present invention is provided. Figure 2 for Figure 1 The schematic diagram of the structure of the rotor assembly in the motor shown, Figure 3 for Figure 2 The schematic structural diagram of the first fan in the rotor assembly shown in FIG. Figure 4 for Figure 2 A schematic structural diagram of the second fan in the rotor assembly is shown.

[0020] like Figures 1 to 4 As shown, an embodiment of the present application provides a motor 100 , including a rotating shaft 1 , a stator assembly 2 , and a rotor assembly 3 .

[0021] The stator assembly 2 is sleeved on the outer circumference of the rotating shaft 1. The stator assembly 2 includes a stator bracket 21. The stator bracket 21 has a first end and a second end arranged opposite to each other along its own axial direction. The first end of the stator bracket 21 is connected to the rotating shaft 1 through a first bearing 41.

[0022] The rotor assembly 3 includes a rotor 33, a first fan 31 and a second fan 32. The rotor 33 is sleeved on the outer peripheral side of the stator assembly 2. The first fan 31 is connected to one end of the rotating shaft 1 adjacent to the first bearing 41. The second fan 32 is connected to the second end of the stator bracket 21 through the second bearing 42, and a ventilation duct is formed between the corresponding stator assembly 2 and / or rotor assembly 3 between the first fan 31 and the second fan 32.

[0023] In this embodiment, since the stator assembly 2 and rotor assembly 3 of the motor 100 generate heat during use, heat needs to be dissipated by the first fan 31 and the second fan 32. Specifically, the first fan 31 and the second fan 32 are respectively disposed at the axial ends of the stator bracket 21, and a ventilation duct is formed between the first fan 31 and the second fan 32 corresponding to the stator assembly 2 and / or the rotor assembly 3, so that forced convection cooling is generated between the first fan 31 and the second fan 32. This cooling method can increase the air pressure and provide sufficient cooling air volume for the motor 100.

[0024] In addition, the stator bracket 21 has a first end and a second end arranged opposite to each other along its own axial direction. The first end is connected to the rotating shaft 1 through a first bearing 41, and the second end is connected to the second fan 32 through a second bearing 42. The first bearing 41 can be a double-row ball bearing. The double-row ball bearing serves as the main load-bearing bearing and can provide axial force and radial force to the rotating shaft 1 at the same time; the second bearing 42 can be a rolling bearing, which can improve the stiffness of the rotor assembly 3, so that the length of the rotating shaft 1 can be shortened to within the stator bracket 21, thereby reducing the weight of the entire machine.

[0025] According to the motor 100 provided in the present application, a first fan 31 and a second fan 32 are respectively provided at the axial ends of the rotating shaft 1, and a ventilation duct is formed between the stator assembly 2 and / or the rotor assembly 3 corresponding to the first fan 31 and the second fan 32, so that sufficient cooling air volume can be provided for the motor 100 through a forced air cooling method; in addition, the rotating shaft 1 is relatively short, and the first bearing 41 serves as the main load-bearing bearing, which can provide axial force and radial force support for the rotating shaft 1, and the second bearing 42 can improve the stiffness of the rotor, the structure is simple, and the weight of the whole machine is light.

[0026] In some embodiments, the first fan 31 is a centrifugal fan, which includes a coaxially arranged first sleeve 311 and a second sleeve 312 and a bracket assembly connected between the first sleeve 311 and the second sleeve 312, the bracket assembly includes a plurality of connecting rods 313 arranged at intervals along the outer peripheral side of the first sleeve 311, and the second sleeve 312 is provided with a plurality of guide holes 314 spaced along its own circumference, and the center line of the guide hole 314 is set at a preset angle to the radial direction of the second sleeve 312.

[0027] like Figure 3 As shown, the first fan 31 is a centrifugal fan, which is a mechanical device that generates centrifugal force by rotating the first sleeve 311 to push the gas radially, wherein the first sleeve 311 can rotate around the rotating shaft 1 and drive multiple connecting rods 313 arranged at intervals on its outer circumference to rotate; the second sleeve 312 is provided with multiple guide holes 314 at intervals along its own circumference, and the guide holes 314 adopt an asymmetric structural design to generate high-pressure stable airflow, while enhancing the structural strength of the first fan 31 and achieving low noise and high-efficiency heat dissipation.

[0028] In this article, the center line of the guide hole 314 is set at a preset angle to the radial direction of the second sleeve 312. The center line of the guide hole 314 refers to the set of points that are equidistant from the two side edges of the guide hole 314. The center line of the guide hole 314 is set at a preset angle to the radial direction of the second sleeve 312, and the preset angle can be 30°~60°.

[0029] In some embodiments, the second fan 32 is an axial flow fan, and a fixing hole 321 is provided at its rotation center. The fixing hole 321 is fixedly connected to the outer ring of the second bearing 42. A plurality of through holes 322 are provided between the fixing hole 321 and the outer peripheral surface of the second fan 32. The plurality of through holes 322 are arranged at intervals along the circumference of the second fan 32, and a rotatable blade 323 is provided in each through hole 322.

[0030] like Figure 4 As shown, the second fan 32 is an axial flow fan. When the axial flow fan is working, the multiple blades 323 in the multiple through holes 322 push the air to flow in the same direction as the rotating shaft 1. In this way, the airflow pushed radially from the first fan 31 reaches the second fan 32 after flowing through the ventilation duct on the stator assembly 2 and / or the rotor assembly 3, and flows out along the axial direction of the rotating shaft 1, so that it can traverse the heating positions of the stator assembly 2 and / or the rotor assembly 3, and take out all the generated heat, thereby improving the heat dissipation effect of the motor 100.

[0031] Figure 5 for Figure 1 Schematic diagram of the structure of the rotating shaft in the motor shown.

[0032] In some embodiments, the rotating shaft 1 is provided with a first shoulder 11, a second shoulder 12 and an annular groove 13 along its own axial direction in sequence and at intervals. The first shoulder 11 is connected to the first fan 31 by a fastener 14. One end of the first bearing 41 abuts against the second shoulder 12, and the other end of the first bearing 41 abuts against the retaining ring 15 sleeved on the annular groove 13.

[0033] like Figure 1 and Figure 5 As shown, the rotating shaft 1 is provided with a first shoulder 11, a second shoulder 12, and an annular groove 13, which are sequentially and spaced apart along its axial direction. The outer diameter of the first shoulder 11 is larger than that of the second shoulder 12. The first shoulder 11 is provided with multiple threaded holes along its circumference. The first sleeve 311 of the first fan 31 is correspondingly provided with multiple stepped holes. The fastener 14 is sequentially penetrated through the stepped holes and threaded holes to securely connect the first fan 31 to one end of the rotating shaft 1. A retaining ring 15 is sleeved in the annular groove 13 to secure the first bearing 41 axially between the second shoulder 12 and the retaining ring 15.

[0034] In some embodiments, the motor 100 further includes a locking nut 16 , which is sleeved on the outer circumference of the rotating shaft 1 and pressed against the retaining ring 15 .

[0035] like Figure 1 As shown, an external thread is partially provided on the outer peripheral side of the rotating shaft 1 so that the locking nut 16 is threadedly connected to the rotating shaft 1, and the locking nut 16 is pressed onto the retaining ring 15 to improve the strength of the retaining ring 15 and prevent the retaining ring 15 from breaking due to excessive axial force.

[0036] In some embodiments, the stator bracket 21 is provided with a first positioning hole 211 and a second positioning hole 212 in sequence along its own axial direction. The first positioning hole 211 is fixedly connected to the outer ring of the first bearing 41, and a flange 17 is provided between the second positioning hole 212 and the end of the rotating shaft 1 away from the first bearing 41.

[0037] like Figure 1 As shown, the stator bracket 21 is provided with a first positioning hole 21 and a second positioning hole 212 in sequence along its own axial direction. The inner diameter of the second positioning hole 212 is larger than the inner diameter of the first positioning hole 211. The first positioning hole 211 is fixedly connected to the outer ring of the first bearing 41. A flange 17 is provided between the second positioning hole 212 and the end of the rotating shaft 1 away from the first bearing 41. The flange 17 is fixedly connected to the end face of the second positioning hole 212 by a plurality of fasteners to limit the axial movement of the rotating shaft 1.

[0038] Figure 6 for Figure 1 Schematic diagram of the structure of the stator core in the motor shown.

[0039] In some embodiments, the stator assembly 2 also includes a stator core 22 and a plurality of stator windings (not shown in the figure) located on the outer peripheral side of the stator bracket 21. The stator core 22 is provided with a plurality of stator holes 221 distributed at intervals along its own circumference. Each stator winding is wound around a stator hole 221, and the ventilation duct includes a gap formed between each two adjacent stator windings.

[0040] like Figure 1 and Figure 6 As shown, the stator core 22 is provided with a plurality of stator holes 221 spaced apart along its circumference. Each stator winding is wound around a stator hole 221 so that a gap is formed between each two adjacent stator windings. The plurality of gaps can form a part of a ventilation duct, thereby improving the heat dissipation effect of the motor 100.

[0041] In some embodiments, the stator core 22 is further provided with a plurality of ventilation holes 222 along its circumference, and the ventilation holes 222 are provided closer to the rotating shaft 1 than the stator holes 221 , and the ventilation duct further includes a plurality of ventilation holes 222 .

[0042] like Figure 6 As shown, the stator core 22 is further provided with a plurality of ventilation holes 222 along its circumference, and the ventilation holes 222 are arranged closer to the rotating shaft 1 than the stator holes 221. The plurality of ventilation holes 222 extend axially to form another part of the ventilation duct, further improving the heat dissipation effect of the motor 100.

[0043] In some embodiments, the rotor 33 includes a rotor support 331 and a plurality of magnets 332 disposed on the rotor support 331 . The plurality of magnets 332 are spaced apart along the circumference of the rotor support 331 . The ventilation duct includes a first ventilation duct formed between each two adjacent magnets 332 .

[0044] like Figure 1 and Figure 2 As shown, a plurality of magnetic steels 332 are arranged at intervals along the circumference of the rotor bracket 331 , and a first ventilation channel is formed between each two adjacent magnetic steels 332 , which serves as another part of the ventilation channel to further improve the heat dissipation effect of the motor 100 .

[0045] In some embodiments, the ventilation channel further includes a second ventilation channel formed between the stator core 22 and the plurality of magnetic steels 332 .

[0046] like Figure 1 and Figure 6 As shown, a second ventilation duct is formed between the stator core 22 and the plurality of magnetic steels 332 , serving as another part of the ventilation duct, to further improve the heat dissipation effect of the motor 100 .

[0047] When used in the aviation field, conventional motors typically use liquid cooling for heat dissipation, which generally requires an external oil pump and tank, increasing the weight of the aircraft and reducing safety margins. However, the motor 100 in the embodiment of the present application uses air cooling for forced heat dissipation, eliminating the need for external oil supply equipment and improving the system's safety margins. Compared to conventional motors, the motor 100 in the embodiment of the present application can be reduced in weight by up to approximately 20%, combining the advantages of strong air cooling and lightweight design, and has great application prospects.

[0048] According to the motor provided in the present application, a first fan 31 and a second fan 32 are respectively provided at the axial ends of the rotating shaft 1, and a ventilation duct is formed between the stator assembly 2 and / or the rotor assembly 3 corresponding to the first fan 31 and the second fan 32, so that sufficient cooling air volume can be provided for the motor 100 through a forced air cooling method; in addition, the rotating shaft 1 is relatively short, and the first bearing 41 serves as the main load-bearing bearing, which can provide axial force and radial force support for the rotating shaft 1, and the second bearing 42 can improve the stiffness of the rotor, the structure is simple, and the weight of the whole machine is light.

[0049] It should be noted that references in this specification to "one embodiment," "an embodiment," "an exemplary embodiment," "some embodiments," and the like indicate that the described embodiment may include a particular feature, structure, or characteristic, but not necessarily every embodiment includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0050] It should be readily understood that “on,” “above,” and “over” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0051] Additionally, spatially relative terms, such as "below," "beneath," "beneath," "above," and the like, may be used herein for ease of description to describe the relationship of one element or feature to other elements or features as depicted in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0052] 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 entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A motor, characterized in that: include: shaft; a stator assembly sleeved on an outer circumference of the rotating shaft, the stator assembly comprising a stator bracket, the stator bracket having a first end and a second end oppositely disposed along its own axial direction, the first end of the stator bracket being connected to the rotating shaft via a first bearing; and The rotor assembly includes a rotor, a first fan, and a second fan. The rotor is sleeved on the outer peripheral side of the stator assembly. The first fan is connected to one end of the rotating shaft adjacent to the first bearing. The second fan is connected to the second end of the stator bracket through a second bearing. A ventilation duct is formed between the corresponding stator assembly and / or the rotor assembly between the first fan and the second fan.

2. The motor according to claim 1, characterized in that The first fan is a centrifugal fan, which includes a first sleeve and a second sleeve arranged coaxially and a first bracket connected between the first sleeve and the second sleeve. The first bracket includes a plurality of connecting rods arranged at intervals along the outer circumference of the first sleeve. The second sleeve is provided with a plurality of guide holes arranged at intervals along its own circumference. The center line of the guide hole is set at a preset angle to the radial direction of the second sleeve.

3. The motor according to claim 1, characterized in that The second fan is an axial flow fan, and a fixing hole is provided at its rotation center. The fixing hole is fixedly connected to the outer ring of the second bearing. A plurality of through holes are provided between the fixing hole and the outer peripheral surface of the second fan. The plurality of through holes are arranged at intervals along the circumference of the second fan, and a rotatable blade is provided in each of the through holes.

4. The motor according to claim 1, characterized in that The rotating shaft is provided with a first shoulder, a second shoulder and an annular groove along its own axial direction, and is distributed in sequence and at intervals. The first shoulder is connected to the first fan by a fastener, one end of the first bearing abuts against the second shoulder, and the other end of the first bearing abuts against a retaining ring sleeved on the annular groove.

5. The motor according to claim 4, characterized in that It also includes a locking nut, which is sleeved on the outer peripheral side of the rotating shaft and pressed onto the retaining ring.

6. The motor according to claim 1, characterized in that The stator bracket is provided with a first positioning hole and a second positioning hole in sequence along its axial direction. The first positioning hole is fixedly connected to the outer ring of the first bearing. A flange is provided between the second positioning hole and the end of the rotating shaft away from the first bearing.

7. The motor according to any one of claims 1 to 6, characterized in that The stator assembly also includes a stator core and a plurality of stator windings located on the outer peripheral side of the stator bracket. The stator core is provided with a plurality of stator holes distributed at intervals along its own circumference. Each of the stator windings is wound around one of the stator holes. The ventilation duct includes a gap formed between each two adjacent stator windings.

8. The motor according to claim 7, characterized in that The stator core is further provided with a plurality of ventilation holes along its circumference, and the ventilation holes are arranged closer to the rotating shaft than the stator holes, and the ventilation duct further includes a plurality of the ventilation holes.

9. The motor according to claim 7, characterized in that The rotor includes a rotor support and a plurality of magnetic steels arranged on the rotor support. The plurality of magnetic steels are arranged at intervals along the circumference of the rotor support. The ventilation passage includes a first ventilation passage formed between every two adjacent magnetic steels.

10. The motor according to claim 9, characterized in that The ventilation passage further includes a second ventilation passage formed between the stator core and the plurality of magnetic steels.

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