CN211209447U

CN211209447U - Motor casing, brushless DC motor and unmanned aerial vehicle

Info

Publication number: CN211209447U
Application number: CN201922431431.4U
Authority: CN
Inventors: 周少平; 叶立厚; 唐小龙
Original assignee: Shenzhen Kechuangxing Motor Technology Co ltd
Current assignee: Shenzhen Kechuangxing Motor Technology Co ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-08-07
Anticipated expiration: 2029-12-30

Abstract

The embodiment of the utility model discloses motor housing, brushless DC motor and unmanned aerial vehicle. The motor shell is characterized by comprising a shell, a main shaft and a reinforcing sleeve, wherein the main shaft is connected with the shell in an interference fit mode, the reinforcing sleeve is fixed on the main shaft, and the reinforcing sleeve is abutted to the shell and fixedly connected with the shell. The main shaft is connected with the shell in an interference manner, and the main shaft and the shell are tightly matched. Furthermore, the reinforcing sleeve is fixed on the main shaft and fixed with the shell, so that the fixed connection strength of the main shaft and the shell is further improved, and the capability of the main shaft for resisting external axial impact force can be improved. And the reinforcing sleeve reduces the mounting pressure on the main shaft assembly, and has small influence on the coaxiality of the main shaft.

Description

Motor casing, brushless DC motor and unmanned aerial vehicle

Technical Field

The utility model relates to the technical field of electric machines, especially, relate to a motor housing, brushless DC motor and unmanned aerial vehicle.

Background

Brushless DC motor includes rotor subassembly and stator module, and the rotor subassembly includes the casing and is fixed in the main shaft of casing, and wherein, the motor shaft is connected in the casing through grafting interference fit to improve the concentricity and the cooperation precision of casing and motor shaft. In the related art, the pushing-off force of the motor shaft is distributed at 15-20 KG, and when the impact force of the falling of the motor is larger than the pushing-off force of the motor shaft, the motor shaft can be loosened and displaced. When the interference magnitude of the motor shaft and the shell is increased, the shaft bending phenomenon can occur in the assembling process of the motor shaft and the shell, and the concentricity of the shell and the motor shaft is poor.

SUMMERY OF THE UTILITY MODEL

To the technical problem, the embodiment of the utility model provides a motor housing, brushless DC motor and unmanned aerial vehicle.

A first aspect of the embodiments provides a motor casing, including casing, interference fit connect in the main shaft of casing with be fixed in the reinforcement cover of main shaft, the reinforcement cover butt in the casing and with casing fixed connection.

Optionally, the reinforcing sleeve is welded to the housing.

Optionally, the reinforcing sleeve is provided with a mounting hole, the spindle is inserted into the mounting hole and is connected with the reinforcing sleeve in an interference fit manner, and one end of the reinforcing sleeve abuts against the shell and is connected with the shell in a welding manner.

Optionally, the reinforcing sleeve further includes an insertion hole coaxially disposed with the mounting hole, and a part of the housing is inserted into the insertion hole.

Optionally, the casing includes the installation wall, set up in the shaft hole of installation wall and certainly installation wall convex grafting portion, the shaft hole runs through grafting portion with the installation wall, the main shaft with the shaft hole interference fit is connected and one end is worn out the casing, the reinforcement sleeve is fixed in the main shaft and with grafting portion grafting cooperation is connected.

Optionally, the spindle includes a shaft body and a step portion formed by partially protruding from the surface of the shaft body, the reinforcing sleeve is sleeved on one end of the shaft body and abuts against the step portion, the other end of the shaft body is inserted into the housing, and the step portion abuts against the reinforcing sleeve.

A second aspect of the embodiment of the present invention provides a brushless dc motor, including as above motor housing, interval install in motor housing's permanent magnet assembly, mount, install in the coil pack and the bearing assembly of mount, the main shaft install in the bearing assembly, the coil pack when the circular telegram with permanent magnet assembly magnetic induction, in order to drive the casing with the main shaft rotates.

Optionally, the reinforcement sleeve abuts an inner ring of the bearing assembly.

Optionally, the fixing frame includes a fixing portion and a flange portion formed by local protrusion from the surface of the fixing portion, the fixing portion is provided with an assembly hole, the bearing assembly is installed in the assembly hole, and the coil assembly is installed on the peripheral wall of the fixing portion.

The embodiment of the third aspect provides an unmanned aerial vehicle, including the flight main part, as above brushless DC motor with install in brushless DC motor's rotor.

The embodiment of the utility model provides an among the technical scheme main shaft and casing interference are connected, and cooperation between them is inseparable. Furthermore, the reinforcing sleeve is fixed on the main shaft and fixed with the shell, so that the fixed connection strength of the main shaft and the shell is further improved, and the capability of the main shaft for resisting external axial impact force can be improved. And the reinforcing sleeve reduces the mounting pressure on the main shaft assembly, and has small influence on the coaxiality of the main shaft.

Drawings

Fig. 1 is a schematic sectional view of a motor casing with a spindle as an optical axis according to an embodiment of the present invention;

fig. 2 is a schematic sectional view of a motor housing in which a main shaft is a step shaft according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a reinforcement sleeve according to an embodiment of the present invention;

fig. 4 is a schematic perspective view of an output end of the brushless dc motor according to the embodiment of the present invention;

fig. 5 is a schematic perspective view of an installation end of the brushless dc motor according to an embodiment of the present invention;

fig. 6 is a schematic cross-sectional view of a brushless dc motor according to an embodiment of the present invention.

In the figures, a housing 10; a mounting wall 11; a shaft hole 12; a plug-in part 13; an annular wall 14; a main shaft 20; a shaft body 21; a step portion 22; a reinforcing sleeve 30; a mounting hole 31; a plug-in hole 32; a coil assembly 40; the driving coil 41; a fixed frame 50; a fixed part 51; a flange portion 52; the fitting hole 53; a threading hole 54; a fixing hole 55; a permanent magnet assembly 60; a permanent magnet 61; a bearing assembly 70.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that the following embodiments may be combined without conflict.

Referring to fig. 1, an embodiment of a motor housing according to the embodiment of the present invention includes: the motor shell comprises a shell 10, a main shaft 20 connected to the shell 10 in an interference fit manner and a reinforcing sleeve 30 fixed on the main shaft 20, wherein the reinforcing sleeve 30 abuts against the shell 10 and is fixedly connected with the shell 10.

The housing 10 is a thin-walled structural member having an installation space therein. Optionally, the housing 10 includes a mounting wall 11 and a shaft hole 12 provided in the mounting wall 11, the spindle 20 is inserted into the shaft hole 12, and the reinforcing sleeve 30 is attached to and fixedly connected to the mounting wall 11. The mounting wall 11 is a wall portion for fixing the main shaft 20, and has a stable structural shape and rigidity. The mounting wall 11 is provided with a through shaft hole 12, and the spindle 20 is inserted into the shaft hole 12 and connected with the housing 10 in an interference fit manner, so that the spindle and the housing are tightly matched and the mounting position is reliable. Wherein, one end of the main shaft 20 is located in the installation space, and the other end thereof penetrates out of the housing 10. Optionally, the housing 10 further comprises an annular wall 14 surrounding the mounting wall 11, the annular wall 14 and the mounting wall 11 constituting a cylindrical structure, which encloses a space forming the mounting space.

The reinforcing sleeve 30 is fixed to the main shaft 20, and is coaxially disposed with high coaxiality. Alternatively, the reinforcing sleeve 30 may be mounted to the main shaft 20, then mounted to the housing 10 with the main shaft 20 and attached to the surface of the housing 10. Optionally, the main shaft 20 is connected with the housing 10 in a plug interference fit manner, and the reinforcing sleeve 30 is connected with the main shaft 20 in an interference fit manner and moves along the center line of the main shaft 20 until being attached to the surface of the housing 10. The reinforcing sleeve 30 and the shell 10 are matched and fixedly connected with the main shaft 20, the single friction resistance borne by the main shaft 20 is small, the deformation of the main shaft 20 is small, and the coaxiality is high. The reinforcing sleeve 30 is fixedly connected with the housing 10, and both form an integrated structure to simultaneously define the position of the main shaft 20, and the axial resistance of the main shaft 20 relative to the reinforcing sleeve 30 and the housing 10 is increased, so that the capability of the main shaft 20 for resisting the external axial impact force is enhanced, and the stability of the overall structure of the motor casing is improved.

The reinforcing sleeve 30 is fixedly connected with the housing 10 so as to fix the two into an integral structure. Optionally, the reinforcement sleeve 30 is snap-fit connected to the housing 10. For example, the housing 10 is provided with a snap hole, and the end of the reinforcing sleeve 30 is provided with a partially protruding snap rib. The reinforcing sleeve 30 is attached to the surface of the casing 10, and the clamping ribs are correspondingly inserted into the clamping holes and buckled on the casing 10, so that the reinforcing sleeve 30 is fixedly connected with the casing 10. Optionally, the reinforcing sleeve 30 is riveted to the housing 10. For example, the case 10 is provided with a spin-riveting hole, and the end of the reinforcing sleeve 30 is provided with a riveting rib that partially protrudes. The reinforcing sleeve 30 is attached to the surface of the casing 10, and the riveting ribs are correspondingly inserted into the spin riveting holes and are turned outwards or inwards to be connected to the casing 10 in a spin riveting manner, so that the reinforcing sleeve 30 is fixedly connected with the casing 10.

Optionally, the reinforcing sleeve 30 is welded to the housing 10 to integrate the two. One end of the reinforcing sleeve 30 is attached to the surface of the housing 10, and the two are welded and connected into a whole, so that the connection strength is high. Optionally, the reinforcing sleeve 30 is connected to the housing 10 by laser welding, and the welding seam is an annular welding seam.

As shown in fig. 1 and 3, the reinforcing sleeve 30 is fixedly connected to the main shaft 20 so as to connect the two into a whole. Optionally, the reinforcing sleeve 30 is provided with a mounting hole 31, the spindle 20 is inserted into the mounting hole 31 and connected with the reinforcing sleeve 30 in an interference fit manner, and one end of the reinforcing sleeve 30 abuts against the housing 10 and is connected with the housing 10 in a welding manner.

The main shaft 20 is inserted into the mounting hole 31, so that the reinforcing sleeve 30 is sleeved on the main shaft 20 and connected with the main shaft 20 in an interference fit manner, and the main shaft 20 and the mounting hole are convenient to mount. The reinforcing sleeve 30 moves relative to the center line of the spindle 20 and abuts against the surface of the housing 10, and the mounting position of the reinforcing sleeve 30 is determined. Optionally, the end surface of the reinforcing sleeve 30 is a plane so that the reinforcing sleeve 30 is attached to the surface of the casing 10, and the joint surface between the two is large and the attachment tightness is high. Optionally, the end surface of the reinforcing sleeve 30 partially protrudes to form an annular rib, and the end surface of the annular rib abuts against the surface of the shell 10, so that the two are well attached. One end of the reinforcing sleeve 30 is abutted against the shell 10 and is connected with the shell 10 into a whole through a welding process, and the main shaft 20 is high in mounting and fixing position precision and high in coaxiality.

Alternatively, the surface of the mounting wall 11 of the housing 10 is set to be a flat surface, and the end surface of the reinforcing sleeve 30 is directly abutted against and attached to the mounting wall 11 and is welded to the mounting wall 11. The shaft hole 12 penetrates through the mounting wall 11, and the main shaft 20 is inserted into the shaft hole 12 and connected with the shaft hole 12 in an interference fit manner. Alternatively, the surface of the mounting wall 11 is partially protruded to form a tubular protrusion structure, and the shaft hole 12 is located at the center of the protrusion structure. The reinforcing sleeve 30 is adapted to the housing 10 to improve the tightness of the combination of the two.

Optionally, the reinforcing sleeve 30 further includes a plug hole 32 coaxially disposed with the mounting hole 31, and a portion of the housing 10 is plugged into the plug hole 32. The plug hole 32 and the mounting hole 31 are coaxially arranged in a stepped hole structure, and the plug hole 32 is partially connected with the housing 10 in a plug fit manner.

Optionally, the housing 10 further includes an insertion portion 13 protruding from the mounting wall 11, the shaft hole 12 penetrates through the insertion portion 13 and the mounting wall 11, the main shaft 20 is connected with the shaft hole 12 in an interference fit manner, and one end of the main shaft penetrates through the housing 10, and the reinforcing sleeve 30 is fixed to the main shaft 20 and is connected with the insertion portion 13 in an insertion fit manner.

The insertion part 13 is protruded on the mounting wall 11 in a tubular shape, the shaft hole 12 penetrates through the mounting wall 11 and the insertion part 13, and the matching area of the shaft hole 12 and the main shaft 20 is increased. The reinforcing sleeve 30 is sleeved on the main shaft 20 and abuts against the surface of the mounting wall 11, and accordingly, the insertion part 13 is inserted into the insertion hole 32 to be connected in a matching mode, so that the matching precision of the reinforcing sleeve 30 and the shell 10 is improved, meanwhile, the peripheral wall of the insertion part 13 is limited, and the capability of the main shaft 20 for resisting transverse impact force is improved. In addition, the reinforcing sleeve 30 is separately processed and then mounted on the housing 10, so that the processing cost of the housing 10 can be reduced.

The peripheral wall of the insertion part 13 is inserted and matched with the insertion hole 32 to ensure that the installation position of the two parts is accurate and the installation guidance is good. Optionally, the insertion portion 13 is in clearance fit connection with the insertion hole 32, so as to improve the convenience of mounting the reinforcing sleeve 30 with the housing 10 and improve the corresponding guidance. Alternatively, the insertion portion 13 is connected with the insertion hole 32 in an interference fit manner, so that the casing 10 and the reinforcing sleeve 30 are tightly combined, the end face of the reinforcing sleeve 30 is welded with the mounting wall 11, and the position of the reinforcing sleeve 30 relative to the casing 10 is fixed. The spindle 20 is inserted into the shaft hole 12 of the housing 10 and the mounting hole 31 of the reinforcing sleeve 30, and the insertion portion 13 is connected to the insertion hole 32 in an interference fit manner, so that the coaxiality of the shaft hole 12 and the mounting hole 31 can be improved.

As shown in fig. 1 and 2, the main shaft 20 is inserted into the housing 10 and the reinforcing sleeve 30 to improve the axial position stability of the main shaft 20 under the impact of an external force, and the anti-slip force is large. Optionally, the spindle 20 is provided as an optical axis to facilitate the mounting of the spindle 20 with the housing 10 and the reinforcement sleeve 30. Alternatively, the main shaft 20 is provided as a stepped shaft. The spindle 20 includes a shaft body 21 and a step portion 22 formed by partially protruding from a surface of the shaft body 21, the reinforcing sleeve 30 is sleeved on one end of the shaft body 21 and abuts against the step portion 22, the other end of the shaft body 21 is inserted into the housing 10, and the step portion 22 abuts against the reinforcing sleeve 30.

The shaft body 21 protrudes from two sides of the step portion 22, and the shaft body 21 at one end is connected to the housing 10 in an inserting manner and connected to the housing 10 in an interference fit manner. The shaft body 21 at the other end is inserted and connected to the reinforcing sleeve 30 and is connected with the reinforcing sleeve 30 in an interference fit manner. The reinforcing sleeve 30 is fixed to the housing 10 such that the step portion 22 is sandwiched between the mating part 13 and the bottom wall of the mating hole 32. The axial impact force applied to the main shaft 20 can be transmitted to the reinforcing sleeve 30 through the step portion 22, and then transmitted to the housing 10 through the reinforcing sleeve 30, and the axial position of the main shaft 20 is stabilized.

As shown in fig. 4 to 6, the motor housing disclosed in the above embodiment is applied to a brushless dc motor to improve the shock resistance of the brushless dc motor. Alternatively, the brushless dc motor includes a motor housing as described above, a permanent magnet assembly 60 mounted to the motor housing at intervals, a fixing bracket 50, a coil assembly 40 mounted to the fixing bracket 50, and a bearing assembly 70, and the spindle 20 is mounted to the bearing assembly 70. The coil assembly 40 magnetically induces with the permanent magnet assembly 60 when energized to drive the housing 10 and the spindle 20 to rotate.

The permanent magnet assembly 60 includes two or more permanent magnets 61 fixed to the housing 10, wherein the permanent magnets 61 are spaced apart from the annular wall 14 and disposed opposite to the coil assembly 40. The coil assembly 40 includes two or more driving coils 41, and the driving coils 41 are spaced apart from each other and wound around the fixing frame 50. When energized, the driving coil 41 generates an electromagnetic field and generates a driving force with the permanent magnet 61 located in the electromagnetic field, thereby rotating the motor housing and the permanent magnet assembly 60 mounted to the motor housing relative to the fixed frame 50.

A bearing assembly 70 is provided between the spindle 20 and the mount 50 to enable a motor housing, in which the spindle 20 is disposed, to rotate relative to the mount 50. The bearing assembly 70 includes at least one bearing member, wherein the main shaft 20 is connected to an inner ring of the bearing member, and the fixed frame 50 is connected to an outer ring of the bearing member. Optionally, the bearing assembly 70 includes two bearing members, the two bearing members being spaced apart. The bearing member includes different types of bearings, and can be adaptively adjusted according to design requirements, and is not particularly limited herein.

The motor housing is mounted to the bearing assembly 70 by the spindle 20, optionally with the reinforcing sleeve 30 abutting against an inner ring of the bearing assembly 70 to define an axial position between the bearing assembly 70 and the motor housing. The reinforcing sleeve 30 plays a role in limiting and positioning, reduces the axial size of the brushless direct current motor, enables the axial impact on the spindle 20 to be directly transmitted to the bearing through the reinforcing sleeve 30, and improves the axial anti-falling force of the spindle 20. Optionally, the spindle 20 passes through the bearing assembly 70 and is locked by a lock to prevent the spindle 20 from disengaging the bearing assembly 70. For example, the locking member is a snap spring, a latch, or the like attached to the spindle 20.

The fixing bracket 50 is used to mount and support the bearing assembly 70 and the motor housing, and to connect and fix the brushless dc motor to an external device. Optionally, the fixing frame 50 includes a fixing portion 51 and a flange portion 52 formed by partially protruding from a surface of the fixing portion 51, and the fixing portion 51 is provided with a mounting hole 53. The bearing assembly 70 is mounted to the mounting hole 53, and the coil assembly 40 is mounted to the outer circumferential wall of the fixing portion 51.

The fitting hole 53 is opened to the fixing portion 51 and serves to define the mounting bearing assembly 70. For example, the two bearing members are respectively fitted to the fixing portion 51 from both ends of the fitting hole 53 and are spaced apart by the spacing ribs in the fitting hole 53, and the fitting accuracy is high. The coil assembly 40 is fixed to the outer circumferential wall of the fixing portion 51, so that the coil assembly 40 is fixedly connected to the fixing frame 50. For example, the coil assembly 40 is sleeved with the fixing part 51 to realize integral assembly, and the assembly efficiency is high. The coil assembly 40 is independently processed and integrally mounted to the fixing frame 50, so that the processing efficiency is high and the processing is convenient.

The flange 52 is protruded from the fixing portion 51, and is used to connect and fix the brushless dc motor to an external device. Optionally, the flange portion 52 is provided with a threading hole 54 and two or more fixing holes 55, and the threading hole 54 is used for leading out a wire used for the coil assembly 40 and connecting with a power supply. The fixing portions 51 are spaced apart from the flange portion 52, so that the fastening member can pass through the fixing hole 55 and fix the flange portion 52 to the external device, and the connection effect is good.

The brushless direct current motor disclosed by the embodiment can be applied to an unmanned aerial vehicle and the like, the brushless direct current motor can keep stable structural form and working performance when the unmanned aerial vehicle falls and impacts, and the operation stability is good. Optionally, the drone comprises a flying body and a brushless dc motor as disclosed in the above embodiments and a rotor mounted to the brushless dc motor.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. The utility model provides a motor shell, its characterized in that, including casing, interference fit connect in the main shaft of casing and be fixed in the reinforcement cover of main shaft, reinforcement cover butt in the casing and with casing fixed connection.

2. The motor housing of claim 1, wherein the reinforcing sleeve is welded to the housing.

3. The motor casing as claimed in claim 2, wherein the reinforcing sleeve is provided with a mounting hole, the spindle is inserted into the mounting hole and is connected with the reinforcing sleeve in an interference fit manner, and one end of the reinforcing sleeve abuts against the housing and is connected with the housing in a welding manner.

4. The motor housing of claim 3, wherein the reinforcing sleeve further comprises a plug hole coaxially disposed with the mounting hole, and a portion of the housing is plug-connected to the plug hole.

5. The motor casing of claim 1, wherein the housing includes a mounting wall, a shaft hole formed in the mounting wall, and a plug portion protruding from the mounting wall, the shaft hole penetrates through the plug portion and the mounting wall, the main shaft is connected with the shaft hole in an interference fit manner, one end of the main shaft penetrates through the housing, and the reinforcing sleeve is fixed to the main shaft and connected with the plug portion in a plug fit manner.

6. The motor casing of claim 1, wherein the main shaft comprises a shaft body and a step portion partially protruding from a surface of the shaft body, the reinforcement sleeve is sleeved on one end of the shaft body and abuts against the step portion, the other end of the shaft body is inserted into the housing, and the step portion abuts against the reinforcement sleeve.

7. A brushless DC motor comprising a motor housing according to any one of claims 1 to 6, a permanent magnet assembly mounted in spaced relation to the motor housing, a mounting bracket, a coil assembly mounted to the mounting bracket and a bearing assembly, the spindle being mounted to the bearing assembly, the coil assembly being magnetically responsive to the permanent magnet assembly when energised to drive rotation of the housing and the spindle.

8. The brushless dc motor of claim 7, wherein the reinforcing sleeve abuts an inner race of the bearing assembly.

9. The brushless dc motor of claim 7, wherein the fixing frame includes a fixing portion and a flange portion partially formed to protrude from a surface of the fixing portion, the fixing portion is provided with a fitting hole, the bearing assembly is mounted to the fitting hole, and the coil assembly is mounted to a peripheral wall of the fixing portion.

10. A drone, characterized by comprising a flying body, a brushless dc motor according to any one of claims 7 to 9 and a rotor mounted to the brushless dc motor.