electric machine

Abstract

The application relates to the field of aerospace technology, in particular to a motor, which comprises a rotating shaft, a stator assembly sleeved on the outer circumferential side of the rotating shaft, the stator assembly comprising a stator support, the stator support having a first end and a second end oppositely arranged along the axial direction of the stator support, the first end of the stator support being connected with 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 circumferential side of the stator assembly, the first fan being connected with one end of the rotating shaft adjacent to the first bearing, the second fan being connected with the second end of the stator support through a second bearing, and the stator assembly and / or the rotor assembly corresponding to the first fan and the second fan being formed with a ventilation channel. The motor has the forced air cooling mode, the rotating shaft is short, the structure is simple, and the whole motor is light in weight.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aerospace technology, in particular to an electric machine. BACKGROUND

[0002] The outer rotor driving electric machine applied in the field of aerospace mainly includes a rotating shaft, a stator, an end cover, a rotor and the like. The high-power driving electric machine usually adopts a liquid cooling mode for heat dissipation. The shafting usually adopts an internal double bearing or internal-external triple bearing mode. The rotating shaft is relatively long. The overall structure is complex. The weight is large. SUMMARY

[0003] The present application provides an electric machine. The cooling mode of forced air cooling is used to improve the heat dissipation effect of the electric machine. The rotating shaft is relatively short. The structure is simple. The overall weight of the machine is light.

[0004] In a first aspect, the present application provides an electric machine, comprising: a rotating shaft; a stator assembly, which is sleeved on the outer circumferential side of the rotating shaft, the stator assembly comprising a stator support, the stator support having a first end and a second end oppositely arranged along the axial direction of the stator support, the first end of the stator support 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 circumferential side of the stator assembly, the first fan being connected to one end of the rotating shaft adjacent to the first bearing, the second fan being connected to the second end of the stator support through a second bearing, and the stator assembly and / or the rotor assembly corresponding to the first fan and the second fan forming an air duct.

[0005] In a possible implementation, the first fan is a centrifugal fan, which comprises coaxially arranged first and second shaft sleeves and a first support connected between the first and second shaft sleeves. The first support comprises a plurality of connecting rods arranged at intervals along the outer circumferential side of the first shaft sleeve. The second shaft sleeve is provided with a plurality of flow guide holes arranged at intervals along the circumferential direction of the second shaft sleeve. The center line of the flow guide hole is arranged at a preset angle between the radial direction of the second shaft sleeve.

[0006] In a possible implementation, the second fan is an axial fan, the rotating center of which is provided with a fixing hole fixedly connected to the outer ring of the second bearing. A plurality of through holes are arranged between the outer circumferential surface of the second fan and the fixing hole. The plurality of through holes are arranged at intervals along the circumferential direction of the second fan. A rotatable blade is arranged in each through hole.

[0007] In a possible implementation, the rotating shaft is provided with a first shaft shoulder, a second shaft shoulder and an annular groove arranged at intervals in sequence along the axial direction of the rotating shaft. The first shaft shoulder is connected to the first fan through a fastener. One end of the first bearing is abutted to the second shaft shoulder. The other end of the first bearing is abutted to a retainer ring sleeved on the annular groove.

[0008] In a possible implementation, the electric machine further comprises a locking nut, which is sleeved on the outer circumferential side of the rotating shaft and is press-connected to the retainer ring.

[0009] In one possible implementation, the stator support 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 located on the outer periphery of the stator support and a plurality of stator windings. The stator core is provided with a plurality of stator holes spaced apart along its circumference. Each stator winding is wound around a stator hole. The ventilation duct includes a gap formed between each pair of adjacent stator windings.

[0011] In one possible implementation, the stator core is also provided with multiple ventilation holes along its circumference, and the ventilation holes are located closer to the shaft than the stator holes. The ventilation channel also includes multiple ventilation holes.

[0012] In one possible implementation, the rotor includes a rotor support and a plurality of magnets disposed on the rotor support, the plurality of magnets being spaced apart circumferentially along the rotor support, and the ventilation duct includes a first ventilation duct formed between each pair of adjacent magnets.

[0013] In one possible implementation, the ventilation duct also includes a second ventilation duct formed between the stator core and the multiple magnets.

[0014] According to the motor provided in this application, by setting a first fan and a second fan at both ends of the axial direction of the rotating shaft, and forming a ventilation channel between the stator assembly and / or rotor assembly corresponding to the first fan and the second fan, sufficient cooling air volume can be provided to the motor through forced air cooling. In addition, the rotating shaft is relatively short, the first bearing, as the main load-bearing bearing, can provide axial and radial force support for the rotating shaft, and the second bearing can improve the rigidity of the rotor. The structure is simple and the whole machine is lightweight. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 A cross-sectional structural diagram of the motor provided in an embodiment of this application;

[0017] Figure 2 for Figure 1 The diagram shows the structure of the rotor assembly in the motor.

[0018] Figure 3 Fig. 1 is a structural schematic diagram of a motor according to an embodiment of the present application; Figure 2 Fig. 2 is a structural schematic diagram of a rotor assembly in the motor according to the embodiment of the present application;

[0019] Figure 4 Fig. 3 is a structural schematic diagram of a stator core in the motor according to the embodiment of the present application; Figure 2 Fig. 4 is a structural schematic diagram of a first fan in the rotor assembly according to the embodiment of the present application;

[0020] Figure 5 Fig. 5 is a structural schematic diagram of a second fan in the rotor assembly according to the embodiment of the present application; Figure 1 Fig. 6 is a structural schematic diagram of a rotating shaft in the motor according to the embodiment of the present application;

[0021] Figure 6 Fig. 7 is a structural schematic diagram of the stator core in the motor according to the embodiment of the present application. Figure 1

[0022] The reference signs are as follows:

[0023] 100, motor;

[0024] 1, rotating shaft; 11, first shaft shoulder; 12, second shaft shoulder; 13, annular groove; 14, fastener; 15, retainer; 16, lock nut; 17, flange plate;

[0025] 2, stator assembly; 21, stator support; 211, first positioning hole; 212, second positioning hole; 22, stator core; 221, stator hole; 222, ventilation hole;

[0026] 3, rotor assembly; 31, first fan; 311, first shaft sleeve; 312, second shaft sleeve; 313, connecting rod; 314, flow guide hole; 32, second fan; 321, fixing hole; 322, through hole; 323, blade; 33, rotor; 331, rotor support; 332, magnetic steel;

[0027] 41, first bearing; 42, second bearing. DETAILED DESCRIPTION

[0028] The technical solutions of the present application will be described clearly and completely below in conjunction with embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] Figure 1 Fig. 1 is a structural schematic diagram of a motor according to an embodiment of the present application, Figure 2 Fig. 2 is a structural schematic diagram of a rotor assembly in the motor according to the embodiment of the present application, Figure 1 Fig. 3 is a structural schematic diagram of a first fan in the rotor assembly according to the embodiment of the present application, Figure 3 Fig. 4 is a structural schematic diagram of a second fan in the rotor assembly according to the embodiment of the present application, Figure 2 Fig. 5 is a structural schematic diagram of a rotating shaft in the motor according to the embodiment of the present application, Figure 4 Fig. 6 is a structural schematic diagram of the stator core in the motor according to the embodiment of the present application.​Figure 2 Structure schematic diagram of the second fan in the rotor assembly.

[0030] As Figures 1 to 4 The motor 100 provided by the embodiment of the present application includes a rotating shaft 1, a stator assembly 2 and a rotor assembly 3.

[0031] The stator assembly 2 is sleeved on the outer circumferential side of the rotating shaft 1, and the stator assembly 2 includes a stator support 21 having a first end and a second end oppositely arranged along the axial direction of the stator support 21, and the first end of the stator support 21 is connected with the rotating shaft 1 through a first bearing 41.

[0032] 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 circumferential side of the stator assembly 2, the first fan 31 is connected with one end of the rotating shaft 1 adjacent to the first bearing 41, the second fan 32 is connected with the second end of the stator support 21 through a second bearing 42, and the stator assembly 2 and / or the rotor assembly 3 corresponding to the first fan 31 and the second fan 32 are formed with a ventilation channel.

[0033] In the embodiment, the stator assembly 2 and the rotor assembly 3 of the motor 100 generate heat during use, and the heat needs to be dissipated through the first fan 31 and the second fan 32. Specifically, the first fan 31 and the second fan 32 are arranged at the two axial ends of the stator support 21, and the stator assembly 2 and / or the rotor assembly 3 corresponding to the first fan 31 and the second fan 32 are formed with a ventilation channel, so that forced convection air cooling is formed between the first fan 31 and the second fan 32. This cooling mode can improve the air pressure and provide sufficient cooling air volume for the motor 100.

[0034] In addition, the stator support 21 has a first end and a second end oppositely arranged along the axial direction of the stator support 21, the first end is connected with the rotating shaft 1 through the first bearing 41, and the second end is connected with the second fan 32 through the second bearing 42. The first bearing 41 can be a double-row ball bearing, which can provide axial force and radial force for the rotating shaft 1 as a main load bearing. 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 into the stator support 21, and the weight of the whole machine is reduced.

[0035] According to the motor 100 provided by the present application, the first fan 31 and the second fan 32 are arranged at the two axial ends of the rotating shaft 1, and the stator assembly 2 and / or the rotor assembly 3 corresponding to the first fan 31 and the second fan 32 are formed with a ventilation channel, so that the forced air cooling cooling mode can provide sufficient cooling air volume for the motor 100. In addition, the rotating shaft 1 is relatively short, the first bearing 41 can provide axial force and radial force support for the rotating shaft 1 as a main load bearing, and the second bearing 42 can improve the stiffness of the rotor, so that the structure is simple and the whole machine is light in weight.

[0036] In some embodiments, the first fan 31 is a centrifugal fan, which includes coaxially arranged first and second shaft sleeves 311 and 312 and a bracket assembly connected between the first and second shaft sleeves 311 and 312, the bracket assembly including a plurality of connecting rods 313 arranged at intervals along the outer circumferential side of the first shaft sleeve 311, and the second shaft sleeve 312 being provided with a plurality of flow guide holes 314 arranged at intervals along the circumferential direction thereof, the center line of the flow guide hole 314 being arranged at a preset angle with respect to the radial direction of the second shaft sleeve 312.

[0037] As shown in Figure 3 , the first fan 31 is a centrifugal fan, which generates centrifugal force by rotating the first shaft sleeve 311 to push gas radially, wherein the first shaft sleeve 311 can rotate around the rotating shaft 1 and drive the plurality of connecting rods 313 arranged at intervals along the outer circumferential side thereof to rotate; the second shaft sleeve 312 is provided with a plurality of flow guide holes 314 arranged at intervals along the circumferential direction thereof, the flow guide holes 314 being designed in an asymmetric structure to generate high-pressure stable airflow, thereby enhancing the structural strength of the first fan 31 while achieving low noise and high efficiency of heat dissipation.

[0038] In this document, the center line of the flow guide hole 314 is arranged at a preset angle with respect to the radial direction of the second shaft sleeve 312, the center line of the flow guide hole 314 referring to a set of points equidistant from the two side edges of the flow guide hole 314, and the preset angle between the center line of the flow guide hole 314 and the radial direction of the second shaft sleeve 312 being 30°-60°.

[0039] In some embodiments, the second fan 32 is an axial fan, which is provided with a fixed hole 321 at the center of rotation, the fixed hole 321 being fixedly connected with the outer ring of the second bearing 42, a plurality of through holes 322 being arranged between the fixed hole 321 and the outer circumferential surface of the second fan 32, the plurality of through holes 322 being arranged at intervals along the circumferential direction of the second fan 32, and a rotatable blade 323 being arranged in each through hole 322.

[0040] As shown in Figure 4 , the second fan 32 is an axial fan, when the axial fan is in operation, the plurality of blades 323 in the plurality of through holes 322 push air to flow in the same direction as the rotating shaft 1, so that the airflow pushed radially by the first fan 31 reaches the second fan 32 after flowing through the ventilation channels on the stator assembly 2 and / or the rotor assembly 3, and flows out along the axial direction of the rotating shaft 1, thereby being able to pass through the heat generating positions of the stator assembly 2 and / or the rotor assembly 3 and carry out all the generated heat, thereby improving the heat dissipation effect of the motor 100.

[0041] Figure 5 As shown in Figure 1 , a structural schematic view of the rotating shaft in the motor.

[0042] In some embodiments, the rotating shaft 1 is provided with a first shaft shoulder 11, a second shaft shoulder 12 and an annular groove 13 in sequence and at intervals along the axial direction of the rotating shaft 1, the first shaft shoulder 11 is connected with the first fan 31 through a fastener 14, one end of the first bearing 41 is abutted to the second shaft shoulder 12, and the other end of the first bearing 41 is abutted to a retainer ring 15 sleeved on the annular groove 13.

[0043] As shown in Figure 1 and Figure 5 , the rotating shaft 1 is provided with a first shaft shoulder 11, a second shaft shoulder 12 and an annular groove 13 in sequence and at intervals along the axial direction of the rotating shaft 1, the outer diameter of the first shaft shoulder 11 is greater than the outer diameter of the second shaft shoulder 12, the first shaft shoulder 11 is provided with a plurality of threaded holes along the circumferential direction of the first shaft shoulder 11, the first shaft sleeve 311 of the first fan 31 is correspondingly provided with a plurality of stepped holes, and the fastener 14 is sequentially threaded through the stepped holes and the threaded holes to fixedly connect the first fan 31 with one end of the rotating shaft 1. The retainer ring 15 is sleeved on the annular groove 13 to axially fix the first bearing 41 between the second shaft shoulder 12 and the retainer ring 15.

[0044] In some embodiments, the motor 100 further comprises a locking nut 16, the locking nut 16 is sleeved on the outer circumferential side of the rotating shaft 1 and is press-fitted to the retainer ring 15.

[0045] As shown in Figure 1 , the outer circumferential side of the rotating shaft 1 is partially provided with external threads to threadedly connect the locking nut 16 with the rotating shaft 1, and the locking nut 16 is press-fitted to the retainer ring 15 to improve the strength of the retainer ring 15 and prevent the retainer ring 15 from being broken due to excessive axial force.

[0046] In some embodiments, the stator support 21 is provided with a first positioning hole 211 and a second positioning hole 212 in sequence along the axial direction of the stator support 21, the first positioning hole 211 is fixedly connected with the outer ring of the first bearing 41, and the second positioning hole 212 is provided with a flange plate 17 between the end of the rotating shaft 1 away from the first bearing 41.

[0047] As shown in Figure 1 , the stator support 21 is provided with a first positioning hole 211 and a second positioning hole 212 in sequence along the axial direction of the stator support 21, the inner diameter of the second positioning hole 212 is greater than the inner diameter of the first positioning hole 211, the first positioning hole 211 is fixedly connected with the outer ring of the first bearing 41, and the second positioning hole 212 is provided with a flange plate 17 between the end of the rotating shaft 1 away from the first bearing 41, and the flange plate 17 is fixedly connected with the end face of the second positioning hole 212 through a plurality of fasteners to limit the axial movement of the rotating shaft 1.

[0048] Figure 6 For Figure 1 , the structure diagram of the stator core in the motor.

[0049] In some embodiments, the stator assembly 2 further comprises a stator core 22 and a plurality of stator windings (not shown in the figure) located at the outer circumferential side of the stator support 21, the stator core 22 is provided with a plurality of stator holes 221 spaced along the circumferential direction of the stator core 22, each stator winding is wound around one stator hole 221, and the air passage comprises a gap formed between each adjacent two stator windings.

[0050] As shown in Figure 1 and Figure 6 , the stator core 22 is provided with a plurality of stator holes 221 spaced along the circumferential direction of the stator core 22, each stator winding is wound around one stator hole 221, so that a gap is formed between each adjacent two stator windings, and the plurality of gaps can form a part of the air passage to improve the heat dissipation effect of the motor 100.

[0051] In some embodiments, the stator core 22 is further provided with a plurality of ventilation holes 222 along the circumferential direction of the stator core 22, and the ventilation holes 222 are closer to the rotating shaft 1 than the stator holes 221, and the air passage further comprises the plurality of ventilation holes 222.

[0052] As shown in Figure 6 and , the stator core 22 is further provided with a plurality of ventilation holes 222 along the circumferential direction of the stator core 22, and the ventilation holes 222 are closer to the rotating shaft 1 than the stator holes 221, and the plurality of ventilation holes 222 extend along the axial direction to form another part of the air passage, further improving the heat dissipation effect of the motor 100.

[0053] In some embodiments, the rotor 33 comprises a rotor support 331 and a plurality of magnetic steels 332 arranged on the rotor support 331, the plurality of magnetic steels 332 are spaced along the circumferential direction of the rotor support 331, and the air passage comprises a first air passage formed between each adjacent two magnetic steels 332.

[0054] Figure 1 As shown in Figure 2 and , the plurality of magnetic steels 332 are spaced along the circumferential direction of the rotor support 331, and a first air passage is formed between each adjacent two magnetic steels 332 as another part of the air passage to further improve the heat dissipation effect of the motor 100.

[0055] In some embodiments, the air passage further comprises a second air passage formed between the stator core 22 and the plurality of magnetic steels 332.

[0056] Figure 1 As shown in Figure 6 and , the second air passage is formed between the stator core 22 and the plurality of magnetic steels 332 as another part of the air passage to further improve the heat dissipation effect of the motor 100.

[0057] The motor in the related art is usually used in the aviation field, and is cooled by liquid cooling. An external oil pump and an oil tank are generally needed, which increases the weight of the aircraft and reduces the safety redundancy. The motor 100 in the embodiment of the present application is forcedly cooled by air cooling, and does not need external oil supply equipment, thereby improving the safety redundancy of the system. Compared with the motor in the related art, the weight of the motor 100 in the embodiment of the present application can be reduced by about 20% at most, and the motor 100 has the advantages of air cooling and strong heat dissipation and light weight, and has a high application prospect.

[0058] According to the motor provided in the present application, the first fan 31 and the second fan 32 are arranged at the two axial ends of the rotating shaft 1 respectively, and the corresponding stator assembly 2 and / or rotor assembly 3 between the first fan 31 and the second fan 32 is formed with a ventilation channel, so that the motor 100 can be provided with sufficient cooling air volume by the forced air cooling cooling mode; in addition, the rotating shaft 1 is relatively short, the first bearing 41 serves as a main force bearing and can provide axial force and radial force support for the rotating shaft 1, and the second bearing 42 can improve the rigidity of the rotor, and the structure is simple and the whole machine is light in weight.

[0059] It should be noted that the terms "one embodiment", "an embodiment", "exemplary embodiment", "some embodiments", etc. in the specification mean that the described embodiments can include a particular feature, structure or characteristic, but not necessarily every embodiment. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a particular feature, structure or characteristic is described in connection with an embodiment, it is within the knowledge of those skilled in the art to realize such feature, structure or characteristic in connection with other embodiments described explicitly or implicitly.

[0060] It should be readily understood that "on", "above", and "over" in the present disclosure should be interpreted in the broadest way, so that "on" not only means "directly on", but also includes the meaning of "on" with intermediate features or layers therebetween, and "above" or "over" not only includes the meaning of "above" or "over", but also can include the meaning of "above" or "over" without intermediate features or layers therebetween (i.e., directly on).

[0061] In addition, spatial relative terms, such as "below", "under", "lower", "above", "on", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The device can have other orientations (rotated 90 degrees or otherwise) and the spatial relative descriptors used herein can be interpreted accordingly.

[0062] It should be noted that, in the present document, relational terms such as "first" and "second", and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0063] Finally, it should be noted that the above-described embodiments are merely intended for describing and illustrating, not limiting, the technical solutions of the present application; even though the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some or all of the technical features; and such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments.

Claims

1. An electric motor, characterized in that, include: Shaft; A stator assembly, sleeved on the outer periphery of the rotating shaft, the stator assembly including a stator bracket, the stator bracket having a first end and a second end disposed opposite to each other 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 periphery of the stator assembly. The first fan is connected to one end of the shaft adjacent to the first bearing. The second fan is connected to the second end of the stator bracket through the second bearing. A ventilation channel is formed between the first fan and the second fan in the corresponding stator assembly and / or rotor assembly. The first fan is a centrifugal fan, which includes a first bushing and a second bushing arranged coaxially, and a first bracket connected between the first bushing and the second bushing. The first bracket includes a plurality of connecting rods spaced apart along the outer periphery of the first bushing. The second bushing has a plurality of guide holes spaced apart along its own circumference. The centerline of the guide holes is set at a preset angle with the radial direction of the second bushing. 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. Multiple through holes are provided between the fixing hole and the outer peripheral surface of the second fan. The multiple through holes are spaced apart along the circumference of the second fan. Each through hole is provided with a rotatable blade. The rotating shaft is provided with a first shoulder, a second shoulder and an annular groove arranged sequentially and at intervals along its own axial direction. 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 the retaining ring sleeved in the annular groove. It also includes a locking nut, which is sleeved on the outer circumference of the rotating shaft and pressed against the retaining ring; The stator support 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. The stator assembly also includes a stator core located on the outer periphery of the stator support and a plurality of stator windings. The stator core is provided with a plurality of stator holes spaced apart along its circumference. Each stator winding is wound around one of the stator holes. The ventilation duct includes a gap formed between each pair of adjacent stator windings. The stator core is also provided with a plurality of ventilation holes along its circumference, and the ventilation holes are located closer to the rotating shaft than the stator holes; the ventilation channel also includes a plurality of the ventilation holes. The rotor includes a rotor support and a plurality of magnets disposed on the rotor support, the plurality of magnets being spaced apart circumferentially along the rotor support, and the ventilation duct includes a first ventilation duct formed between each pair of adjacent magnets; The ventilation duct also includes a second ventilation duct formed between the stator core and the plurality of magnets.

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