TWI882369B - Outer rotor type motor of drone - Google Patents

Abstract

An outer rotor type motor of drone device applied to drone includes a motor base, a first bearing, a second bearing, a stator assembly, and a rotor assembly. The motor base includes a base body and an outer ring structure. The base body consists of a cylindrical portion and a seat portion. The first bearing is fixedly mounted within the cylindrical portion. The second bearing is fixedly mounted within the seat portion. The stator assembly is fixedly mounted within the outer ring structure. The rotor assembly includes an outer rotor frame and multiple magnets. The outer rotor frame is rotatably mounted between the first bearing and the second bearing, allowing it to be movably housed within the motor base. The multiple magnets are fixed to the outer rotor frame and spaced apart from the stator assembly.

Description

Rotor motor device other than drone

The present invention relates to a motor device, and more particularly to a rotor-type motor device for a drone.

Generally speaking, in order to improve the hysteresis ability of drones, existing drones will not only use high-power output motors, but also try to reduce the weight of the motor housing. Since drones are very particular about balance, the motors are mainly exo-rotor motors. Compared with the more concentrated rotational inertia of the inner rotor motor, the exo-rotor motor can provide a larger range of rotational inertia, thereby making the drone body more balanced and improving stability.

Please refer to the first figure, which is a cross-sectional schematic diagram of a drone motor of the prior art. As shown in the first figure, a drone motor PA100 includes a stator base PA1, a stator assembly PA2, two bearings PA3 and PA4, a rotating shaft PA5 and a rotor assembly PA6. Among them, the stator assembly PA2 is sleeved and fixed on the stator base PA1, the rotating shaft PA5 is pivotally connected to the stator base PA1 through the two bearings PA3 and PA4, and the rotor assembly PA6 is sleeved and fixed on the rotating shaft PA5, so as to rotate relative to the stator assembly PA2.

As mentioned above, since the drone motor PA100 has the rotor assembly PA6 rotatably mounted outside the stator assembly PA2, it needs the connection of the shaft PA5 to be stably assembled on the stator assembly PA2; however, the shaft PA5 often affects the drone's hysteresis ability due to its certain weight, which is very inconvenient.

In view of the fact that in the prior art, the existing drone motor is connected to the rotor assembly and the stator assembly through a shaft, which easily causes the overall weight to increase significantly due to the existence of the shaft, thereby affecting the hysteresis ability of the drone; therefore, the main purpose of the present invention is to provide a drone external rotor type motor device that can effectively reduce the overall weight through a special mechanism design.

The present invention solves the problems of the prior art by adopting a necessary technical means to provide a rotor-type motor device for a drone, comprising a motor base, a first bearing, a second bearing, a stator assembly and a rotor assembly.

The motor base includes a base body and an outer ring structure. The base body includes a cylinder part and a seat part. The cylinder part extends along an axial direction and has a top bearing arrangement structure. The seat part includes an inner sleeve and a plurality of inner ring connecting pieces. The inner sleeve is circumferentially sleeved on the cylinder part and has a bottom bearing arrangement structure.

A plurality of inner ring connecting pieces are integrally formed and radially extend from the peripheral surface of the cylinder portion and are respectively integrally formed and connected to the inner sleeve ring, so as to separate a plurality of first axial channels between the cylinder portion and the inner sleeve ring.

The outer ring structure comprises an outer sleeve ring and a plurality of outer ring connecting pieces. The outer sleeve ring is sheathed around the inner sleeve ring.

A plurality of outer ring connecting pieces are integrally formed and radially extend from the circumference of the inner ring and are respectively integrally formed and connected to the outer ring, so as to separate a plurality of second axial channels between the inner ring and the outer ring.

The first bearing is sleeved and fixed on the top bearing arrangement structure. The second bearing is sleeved and fixed on the bottom bearing arrangement structure. The stator assembly is sleeved and fixed on the outer sleeve ring.

The rotor assembly includes an outer rotor frame and a plurality of magnets. The outer rotor frame includes a top centrifugal impeller, a bottom centrifugal impeller and a protective ring.

The top centrifugal impeller is sleeved and fixed on the first bearing, and the bottom centrifugal impeller is sleeved and fixed on the second bearing.

The protective ring is connected to the top centrifugal impeller and the bottom centrifugal impeller, and is sleeved on the stator assembly.

A plurality of magnets are fixed between the top centrifugal impeller and the bottom centrifugal impeller in an annular distribution and are spaced apart from the stator assembly respectively.

In an auxiliary technical means derived from the above necessary technical means, the inner sleeve further includes an inner ring body and an annular base. The inner ring body is spaced apart from the cylinder portion. The annular base is integrally connected to the cylinder portion and the inner ring body, and is provided with a plurality of wiring holes, which are respectively connected to the first axial channels.

In an auxiliary technical means derived from the above necessary technical means, the bottom centrifugal impeller further includes a bottom impeller collar, a bottom impeller ring plate and a bottom impeller ring plate. The bottom impeller collar is sleeved and fixed on the second bearing. The bottom impeller ring plate is connected to the bottom impeller collar. The bottom assembly ring is circumferentially connected to the bottom impeller ring plate for assembly to the protective ring.

Preferably, the bottom assembly ring further includes a set of connection ring pieces, a plurality of connecting ribs and a bottom butt convex ring. The assembly ring piece surrounds the bottom impeller ring plate. A plurality of connecting ribs are respectively connected to the bottom impeller ring plate and the assembly ring piece. The bottom butt convex ring protrudes from the assembly ring piece for inserting the protective ring.

In addition, the bottom centrifugal impeller further includes a plurality of first bottom buckle structures, which are radially protruded outward from the bottom docking convex ring, and the first bottom buckle structures are arranged around each other at intervals. The protective ring further has a bottom edge of the protective ring, and the bottom edge of the protective ring has a plurality of second bottom buckle structures, which are arranged around each other at intervals and are used to respectively correspond to the first bottom buckle structures.

On the other hand, the connecting ribs further form a plurality of bottom air ducts between the bottom impeller ring and the connecting ring plate, and the bottom air ducts are respectively connected to the second axial channels.

In an auxiliary technical means derived from the above necessary technical means, the top centrifugal impeller further includes a top impeller collar, a top impeller annular disc and a top butt-joint convex ring. The top impeller collar is fixedly mounted on the first bearing. The top impeller annular disc is circumferentially connected to the top impeller collar. The top butt-joint convex ring protrudes from the top impeller annular disc and is used to be inserted into the protective ring.

Preferably, the top centrifugal impeller further comprises a plurality of first top buckle structures, which protrude outward radially from the top abutting convex ring, and the first top buckle structures are arranged around each other at intervals. The protective ring further comprises a top edge of the protective ring, and the top edge of the protective ring has a plurality of second top buckle structures, which are arranged around each other at intervals and are used to respectively correspond to and buckle the first top buckle structures.

On the other hand, the top centrifugal impeller further includes an air guide ring cover, which is fixed to the top impeller collar and radiates outwardly with a plurality of top air ducts, and the top impeller ring is further provided with a plurality of axial connecting holes, which are respectively connected to the second axial channels and the top air ducts.

In addition, the top docking convex ring has a plurality of magnet fixing ribs, which protrude toward the bottom centrifugal impeller and are arranged at intervals from each other, and the magnets are respectively embedded between the magnet fixing ribs.

As mentioned above, the present invention mainly fixes the first bearing and the second bearing sleeve on the motor base, so that the outer rotor frame can be directly rotatably connected to the motor base through the first bearing and the second bearing, thereby achieving the effect of reducing weight.

The specific embodiments adopted by the present invention will be further described through the following embodiments and drawings.

100: Rotor motor device other than drone

1: Motor base

11: Base body

111: Cylinder body

1111: Top bearing setting structure

112: Seat body

1121:Inner ring

11211: Inner ring body

112111: Bottom bearing setting structure

11212: Ring base

112121: Cable routing hole

112122: Locking hole

1122: Inner ring connecting piece

12: Outer ring structure

121: Outer ring

1211: Connecting flange

122: Outer ring connecting piece

2: First bearing

21: First bearing inner ring

22: First bearing outer ring

3: Second bearing

31: Second bearing inner ring

32: Second bearing outer ring

4: Stator assembly

5: Rotor assembly

51: External rotor frame

511: Top centrifugal impeller

5111: Top impeller ring

5112: Top impeller ring plate

51121: Top plate outer surface

51122: Inner surface of top plate

51123: Axial connecting hole

51124: Top positioning mark

51125: Top plate perforation

5113: Top butt joint cam

51131: Magnetic fixing ribs

5114: First top buckle structure

5115: Air guide ring cover

5115T: Top air duct

512: Bottom centrifugal impeller

5121: Bottom impeller ring

5122: Bottom impeller ring

51221: Chassis outer surface

51222: Inner surface of chassis

5123: Bottom assembly ring

5123T: Bottom air duct

51231: Assembly ring

512311: Bottom positioning mark

512312: Chassis perforation

51232: Connecting ribs

51233: Bottom butt joint cam

5124: First bottom buckle structure

513: Protective ring

5131: Protective ring top edge

51311: Second top buckle structure

5132: bottom edge of protective ring

51321: Second bottom buckle structure

5133: Air guide ring cover

52:Magnet

T1: First axial channel

T2: Second axial channel

L1: First lock firmware

L2: Second lock firmware

D1: Axial

W: Cable

The first figure is a cross-sectional schematic diagram of a drone motor of the prior art; the second figure is a three-dimensional schematic diagram of an external rotor type motor device of a drone provided by a preferred embodiment of the present invention; the third figure is a three-dimensional exploded schematic diagram of an external rotor type motor device of a drone provided by a preferred embodiment of the present invention; the fourth figure is a three-dimensional exploded schematic diagram of another viewing angle of the external rotor type motor device of a drone provided by a preferred embodiment of the present invention; the fifth figure is an A-A cross-sectional schematic diagram of the second figure; the sixth figure is a cross-sectional exploded schematic diagram showing that the rotor assembly of the external rotor type motor device of a drone provided by a preferred embodiment of the present invention is rotatably assembled to the motor base through the first bearing and the second bearing; the seventh figure is a bottom centrifugal impeller assembly provided by a preferred embodiment of the present invention is connected to the motor base; The third embodiment of the present invention is a schematic diagram of the bottom centrifugal impeller provided by the preferred embodiment of the present invention inserted into the protective ring; the ninth embodiment is a schematic diagram of the B-B section of the eighth embodiment; the tenth embodiment is a schematic diagram of the bottom centrifugal impeller provided by the preferred embodiment of the present invention inserted into the protective ring and fixedly connected to the protective ring by rotation; the eleven ... The C-C cross-sectional diagram of Figure 10; Figure 12 is a three-dimensional exploded schematic diagram of the top centrifugal impeller provided by the preferred embodiment of the present invention connected to the motor base and the protective ring; Figure 13 is a three-dimensional schematic diagram showing the top centrifugal impeller provided by the preferred embodiment of the present invention inserted into the protective ring and fixed to the protective ring by rotation; and Figure 14 is a D-D cross-sectional diagram of Figure 13.

Please refer to Figures 2 to 6. Figure 2 is a three-dimensional schematic diagram showing the external rotor type motor device of the drone provided by the preferred embodiment of the present invention; Figure 3 is a three-dimensional exploded schematic diagram showing the external rotor type motor device of the drone provided by the preferred embodiment of the present invention; Figure 4 is a three-dimensional exploded schematic diagram showing another viewing angle of the external rotor type motor device of the drone provided by the preferred embodiment of the present invention; Figure 5 is a cross-sectional schematic diagram of the A-A section of Figure 2; Figure 6 is a cross-sectional exploded schematic diagram showing that the rotor assembly of the external rotor type motor device of the drone provided by the preferred embodiment of the present invention is rotatably assembled to the motor base through the first bearing and the second bearing.

As shown in the second to sixth figures, a rotor-type motor device 100 for a drone includes a motor base 1, a first bearing 2, a second bearing 3, a stator assembly 4, and a rotor assembly 5.

The motor base 1 includes a base body 11 and an outer ring structure 12. The base body 11 includes a cylinder portion 111 and a seat portion 112. The cylinder portion 111 extends along an axial direction D1 and has a top bearing arrangement structure 1111. The seat portion 112 includes an inner sleeve 1121 and a plurality of inner ring connecting pieces 1122 (only one is marked in the figure).

The inner ring 1121 includes an inner ring body 11211 and an annular base 11212. The inner ring body 11211 is sleeved on the cylindrical portion 111 and spaced from the cylindrical portion 111. The annular base 11212 is integrally connected to the cylindrical portion 111 and the inner ring body 11211. The annular base 11212 is provided with a plurality of wiring holes 112121 (only one is marked in the figure) and a plurality of locking holes 112122 (only one is marked in the figure). In this embodiment, a plurality of wiring holes 112121 are disposed around the cylindrical body 111, and a plurality of locking holes 112122 are disposed around the plurality of wiring holes 112121.

In addition, a bottom bearing arrangement structure 112111 is also provided on the outer circumference of the inner ring body 11211.

The plurality of inner ring connecting pieces 1122 are integrally formed to extend radially from the circumference of the barrel portion 111, and are integrally formed to connect to the inner collar 1121, so as to separate a plurality of first axial channels T1 (only one is marked in the figure) between the barrel portion 111 and the inner collar 1121; wherein the plurality of first axial channels T1 are respectively connected to the plurality of wiring holes 112121 and the plurality of locking holes 112122.

The outer ring structure 12 includes an outer sleeve 121 and a plurality of outer ring connecting pieces 122 (only one is marked in the figure). The outer sleeve 121 is arranged around the inner sleeve 1121 and is spaced from the inner sleeve 1121. The outer peripheral surface of the outer sleeve 121 has a receiving flange 1211.

The plurality of outer ring connecting pieces 122 are integrally formed to extend radially from the outer circumference of the inner ring body 11211 and are integrally formed to connect to the outer sleeve ring 121, so as to separate a plurality of second axial channels T2 between the inner sleeve ring 1121 and the outer sleeve ring 121.

The first bearing 2 includes a first bearing inner ring 21 and a first bearing outer ring 22. The first bearing inner ring 21 is sleeved and fixed on the top bearing setting structure 1111, and the first bearing outer ring 22 is rotatably sleeved on the first bearing inner ring 21. In practice, a plurality of balls (not shown) are provided between the first bearing inner ring 21 and the first bearing outer ring 22, so that the first bearing inner ring 21 and the first bearing outer ring 22 can rotate relative to each other.

The second bearing 3 includes a second bearing inner ring 31 and a second bearing outer ring 32. The second bearing inner ring 31 is sleeved and fixed on the bottom bearing setting structure 112111, and the second bearing outer ring 32 is rotatably sleeved on the second bearing inner ring 31. In practice, a plurality of balls (not shown) are provided between the second bearing inner ring 31 and the second bearing outer ring 32, so that the second bearing inner ring 31 and the second bearing outer ring 32 can rotate relative to each other.

The stator assembly 4 is sleeved on the outer sleeve ring 121 and supported by the receiving flange 1211, so that the stator assembly 4 is fixed to the outer sleeve ring 121.

The rotor assembly 5 includes an outer rotor frame 51 and a plurality of magnets 52 (only one is marked in the figure). The outer rotor frame 51 includes a top centrifugal impeller 511, a protective ring 513 and a bottom centrifugal impeller 512.

The top centrifugal impeller 511 includes a top impeller collar 5111, a top impeller ring plate 5112, a top mating convex ring 5113, six first top buckle structures 5114 (only one is marked in the figure) and an air guide ring cover 5115. The top impeller collar 5111 is sleeved on the first bearing outer ring 22 and rotatably connected to the motor base 1.

The top impeller ring 5112 is connected to the top impeller collar 5111 in an annular manner and has a top plate outer surface 51121 and a top plate inner surface 51122 arranged opposite to each other. The top impeller ring 5112 also has a plurality of axial through holes 51123 (only one is marked in the figure), a top positioning mark 51124 (marked in the thirteenth figure) and three top plate through holes 51125 (marked in the thirteenth figure, and only one is marked in the figure). The axial connecting holes 51123 are arranged around the top impeller ring 5111, and the plurality of axial connecting holes 51123 extend along the axial direction D1. The top positioning mark 51124 is arranged on the outer surface 51121 of the top plate, and the three top plate through holes 51125 are respectively opened on the edge of the top impeller ring 5112.

The top butt joint convex ring 5113 is circumferentially connected to the edge of the top impeller ring 5112 and extends in the opposite direction of the axial direction D1. The top butt joint convex ring 5113 also has a plurality of magnet fixing ribs 51131 (only one is marked in the figure). The plurality of magnet fixing ribs 51131 are integrally formed on the end surface of the top butt joint convex ring 5113 and protrude in the opposite direction of the axial direction D1.

The six first top buckle structures 5114 are respectively connected to the top docking convex ring 5113 and are arranged around each other at intervals; in this embodiment, the six first top buckle structures 5114 are respectively formed from the outer peripheral surface of the top docking convex ring 5113 and protrude outward in an integral manner, and the three top plate through holes 51125 correspond to three of the six first top buckle structures 5114, but not limited to this. In other embodiments, the top impeller ring 5112 can also be provided with six top plate through holes 51125 to correspond to the six first top buckle structures 5114.

The air guide ring cover 5115 is detachably fixed to the end of the top impeller collar 5111, and is provided with a plurality of top air ducts 5115T to generate centrifugal airflow during rotation; wherein, after the top centrifugal impeller 511 is rotatably assembled to the barrel portion 111 through the first bearing 2, the plurality of top air ducts 5115T are respectively connected to the first axial channel T1 and the second axial channel T2 through the axial connecting holes 51123.

The bottom centrifugal impeller 512 includes a bottom impeller collar 5121, a bottom impeller ring plate 5122, a bottom assembly ring 5123, and six first bottom buckle structures 5124 (only one is marked in the figure). The bottom impeller collar 5121 is sleeved on the second bearing outer ring 32 and rotatably assembled to the motor base 1.

The bottom impeller ring 5122 is connected to the bottom impeller collar 5121; wherein the bottom impeller ring 5122 also has a bottom plate outer surface 51221 and a bottom plate inner surface 51222 disposed opposite to each other, and the bottom impeller collar 5121 protrudes from the bottom plate inner surface 51222 along the axial direction D1.

The bottom assembly ring 5123 includes a set of ring plates 51231, a plurality of connecting ribs 51232 (only one is marked in the figure) and a bottom docking convex ring 51233.

The assembly ring 51231 is disposed around the outer periphery of the bottom impeller ring 5122, and a plurality of connecting ribs 51232 are respectively connected to the bottom impeller ring 5122 and the assembly ring 51231. The bottom docking convex ring 51233 protrudes from the assembly ring 51231 along the axial direction D1.

The six first bottom buckle structures 5124 protrude outward in a radial shape from the bottom connecting convex ring 51233. In addition, the assembly ring 51231 also has a bottom positioning mark 512311 (marked in the eighth figure) and three bottom plate through holes 512312 (marked in the eighth figure, and only one is marked in the figure).

In this embodiment, the six first bottom buckle structures 5124 are integrally formed and protrude outward from the outer peripheral surface of the bottom docking convex ring 51233.

The protective ring 513 has a protective ring top edge 5131 and a protective ring bottom edge 5132 arranged opposite to each other.

The top edge 5131 of the protective ring has six second top buckle structures 51311 (only one is marked in the figure), and the six second top buckle structures 51311 are arranged around each other at intervals, and are used to respectively correspond to the six first top buckle structures 5114. The bottom edge 5132 of the protective ring has six second bottom buckle structures 51321 (only one is marked in the figure), and the six second bottom buckle structures 51321 are arranged around each other at intervals, and are used to respectively correspond to the six first bottom buckle structures 5124.

As mentioned above, the six second bottom buckle structures 51321 and the six second top buckle structures 51311 in this embodiment are projected and overlapped with each other in the axial direction D1, but this is not limited to this in other embodiments.

The plurality of magnets 52 are respectively embedded between the magnet fixing ribs 51131; thereby, when the bottom centrifugal impeller 512 is assembled to the protective ring 513, the plurality of magnets 52 will be placed in the protective ring 513 and protected by the protective ring 513, and the plurality of magnets 52 are also arranged at intervals around the outer periphery of the stator assembly 4.

As mentioned above, in this embodiment, the top impeller ring 5112 is formed by extending outward from the outer edge of the top impeller collar 5111 in an integral manner, and the top positioning mark 51124 is located between two of the three top plate through holes 51125.

Please continue to refer to Figures 7 to 11. Figure 7 is a three-dimensional exploded schematic diagram showing the bottom centrifugal impeller provided by the preferred embodiment of the present invention connected to the motor base and the protective ring; Figure 8 is a three-dimensional schematic diagram showing the bottom centrifugal impeller provided by the preferred embodiment of the present invention inserted into the protective ring; Figure 9 is a B-B cross-sectional schematic diagram of Figure 8; Figure 10 is a three-dimensional schematic diagram showing the bottom centrifugal impeller provided by the preferred embodiment of the present invention inserted into the protective ring and fixedly connected to the protective ring by rotation; Figure 11 is a C-C cross-sectional schematic diagram of Figure 10.

As shown in the second to eleventh figures, in practice, the assembly of the external rotor motor device 100 of the drone of this embodiment is, for example, to first assemble the bottom centrifugal impeller 512 to the motor base 1 through the first bearing 2, and then assemble it to the protective ring 513.

As mentioned above, when assembling the bottom centrifugal impeller 512 and the protective ring 513, the six first bottom buckle structures 5124 are first passed through the gaps between the six second bottom buckle structures 51321 to allow the bottom abutting convex ring 51233 to enter the protective ring 513, and then the bottom assembly ring 5123 is rotated along a rotation direction R1 to allow the six first bottom buckle structures 5124 to be buckled with the six second bottom buckle structures 51321, so that the bottom centrifugal impeller 512 is fixed to the protective ring 513.

Please continue to refer to Figures 12 to 13. Figure 12 is a three-dimensional exploded schematic diagram of the top centrifugal impeller provided by the preferred embodiment of the present invention connected to the motor base and the protective ring; Figure 13 is a three-dimensional schematic diagram showing the top centrifugal impeller provided by the preferred embodiment of the present invention inserted into the protective ring and fixed to the protective ring by rotation.

As shown in the first to thirteenth figures, after the bottom centrifugal impeller 512, the motor base 1 and the protective ring 513 are assembled, the six second top buckle structures 51311 can be respectively passed through the gaps between the six first top buckle structures 5114 to make the top butt convex ring 5113 extend into the protective ring 513, and the top impeller ring 5112 can be made to be fixed to the bottom of the impeller ring 5112. The edge of the inner surface 51122 of the top plate abuts against the top edge 5131 of the protective ring 513, and then the top impeller ring plate 5112 is rotated along the rotation direction R1, so that the six second top buckle structures 51311 are buckled into the six first top buckle structures 5114 respectively, so that the top centrifugal impeller 511 is fixedly connected to the protective ring 513.

Please continue to refer to Figure 14, which is a schematic diagram of the D-D section of Figure 13.

As shown in the second to fourteenth figures, after the bottom centrifugal impeller 512 and the top centrifugal impeller 511 are respectively assembled to the protective ring 513, the user can also lock three first locking pieces L1 (only one is shown in the figure) and three second locking pieces L2 (only one is shown in the figure) to the three bottom plate through holes 512312 and the three top plate through holes 51125, so that the bottom centrifugal impeller 512 and the top centrifugal impeller 511 are more stably assembled to the protective ring 513 by clamping the first locking pieces L1 and the second locking pieces L2.

As described above, since the rotor frame 51 of the present embodiment is rotatably connected to the motor base 1 through the arrangement of the first bearing 2 and the second bearing 3, and the top centrifugal impeller 511 is further provided with a top air duct 5115T, and the bottom centrifugal impeller 512 is provided with a bottom air duct 5123T, when the entire rotor assembly 5 rotates relative to the motor base 1, a first air pressure belt and a second air pressure belt are formed at the top air duct 5115T and the bottom air duct 5123T, respectively, and a first reduced pressure of the first air pressure belt is less than a second reduced pressure of the second air pressure belt, so that the first air pressure belt is The pressure of the pressure belt is greater than the pressure of the second air pressure belt, thereby forming a plurality of heat dissipation air flows flowing from the top air duct 5115T through the second axial channel T2 and out of the bottom air duct 5123T; wherein, since the stator assembly 4 is sleeved and fixed on the outer ring structure 12, the heat energy generated by the stator assembly 4 during operation will be directly transferred to the outer ring structure 12, thereby, when the heat dissipation air flow enters the external rotor motor device 100 of the drone from the top air duct 5115T, it will absorb the heat energy transferred by the stator assembly 4 through the second axial channel T2, thereby accelerating the heat dissipation efficiency of the stator assembly 4.

It should be particularly noted that, in this embodiment, the first pressure relief of the first air pressure zone formed at the top air duct 5115T is smaller than the second pressure relief of the second air pressure zone formed at the bottom air duct 5123T. This is mainly because the total amount of centrifugal airflow generated by the bottom air duct 5123T is larger than that of the top air duct 5115T, and the second axial channel T2 is connected to the bottom air duct 5123T and the top air duct 5115T. Therefore, even if the top air duct 5115T It can also generate centrifugal airflow, but because the total amount of centrifugal airflow generated by the top air duct 5115T is smaller, the gas in the second axial channel T2 tends to be discharged from the bottom air duct 5123T, and the first air pressure belt formed at the top air duct 5115T presents a negative pressure state to the outside, so that the external gas enters the outer rotor type air-cooled motor 100 through the top air duct 5115T, and passes through the second axial channel T2 and is discharged from the bottom air duct 5123T.

As mentioned above, the centrifugal airflow generated by the bottom air duct 5123T and the top air duct 5115T mainly depends on the overall cross-sectional area of the bottom air duct 5123T and the top air duct 5115T. In this embodiment, the bottom air duct 5123T can achieve an overall cross-sectional area greater than the overall cross-sectional area of the top air duct 5115T, for example, by the difference in quantity and single cross-sectional area. In addition, in this embodiment, the radius of each bottom air duct 5123T is greater than the radius of each top air duct 5115T, so that the cross-sectional area of each bottom air duct 5123T is greater than the cross-sectional area of each top air duct 5115T. At this time, even if the number of the two is the same, the overall cross-sectional area of the bottom air duct 5123T can be greater than the overall cross-sectional area of the top air duct 5115T, thereby achieving a centrifugal air flow rate generated by the bottom air duct 5123T greater than the centrifugal air flow rate generated by the top air duct 5115T.

In addition, since the motor base 1 of this embodiment is also provided with a wiring hole 112121, the cable W can also enter the motor base 1 through the wiring hole 112121, and then be electrically connected to the stator assembly 4 to supply power to the coil of the stator assembly 4.

In summary, compared to the existing drone motor, which uses a rotating shaft to connect the rotor assembly and the stator assembly, the existence of the rotating shaft easily increases the overall weight, thereby affecting the hysteresis ability of the drone; the external rotor motor device of the drone of the present invention mainly fixes the first bearing and the second bearing sleeve on the motor base, so that the external rotor frame can be directly rotatably connected to the motor base through the first bearing and the second bearing, thereby achieving the effect of reducing weight.

In addition, the motor base of the present invention is also provided with a first axial channel and a second axial channel to further reduce the weight of the entire motor base. Since the outer rotor frame of the present invention is composed of a top centrifugal impeller and a bottom centrifugal impeller, the airflow generated by the top centrifugal impeller and the bottom centrifugal impeller when rotating is different in size. With the connection of the second axial channel, the airflow can be guided from the top centrifugal impeller to enter and pass through the second axial channel, and finally discharged from the bottom centrifugal impeller, thereby effectively improving the heat dissipation efficiency of the stator assembly.

The above detailed description of the preferred specific embodiments is intended to more clearly describe the features and spirit of the present invention, but is not intended to limit the scope of the present invention by the preferred specific embodiments disclosed above. On the contrary, the purpose is to cover various changes and arrangements with equivalents within the scope of the patent application for the present invention.

100: Rotor motor device other than drone

112: Seat body

112121: Cable routing hole

122: Outer ring connecting piece

2: First bearing

3: Second bearing

4: Stator assembly

5: Rotor assembly

51125: Top plate perforation

5113: Top butt joint cam

51131: Magnetic fixing ribs

5114: First top buckle structure

5115: Air guide ring cover

5115T: Top air duct

512: Bottom centrifugal impeller

51231: Assembly ring

512312: Chassis perforation

51233: Bottom butt joint cam

513: Protective ring

52:Magnet

T1: First axial channel

T2: Second axial channel

L1: First lock firmware

L2: Second lock firmware

W: Cable

Claims (10)

An external rotor type motor device for a drone comprises: a motor base, comprising: a base body, comprising: a cylindrical portion extending along an axial direction and having a top bearing arrangement structure; and a seat portion, comprising: an inner sleeve ring, which is circumferentially sleeved on the cylindrical portion and has a bottom bearing arrangement structure; and a plurality of inner ring connecting pieces, which are integrally formed from the cylindrical portion. The outer ring structure includes an outer ring which is radially extended from the circumference of the inner ring and is integrally connected to the inner ring so as to separate a plurality of first axial channels between the barrel and the inner ring; and an outer ring structure, comprising: an outer ring which is circumferentially sleeved on the inner ring; and a plurality of outer ring connecting pieces which are integrally extended from the circumference of the inner ring and are integrally connected to the inner ring. The outer ring is connected to the inner ring to separate a plurality of second axial channels between the inner ring and the outer ring; a first bearing is sleeved and fixed on the top bearing arrangement structure; a second bearing is sleeved and fixed on the bottom bearing arrangement structure; a stator assembly is sleeved and fixed on the outer ring; and a rotor assembly, including; an outer rotor frame, including; a top centrifugal An impeller is sleeved and fixed on the first bearing; a bottom centrifugal impeller is sleeved and fixed on the second bearing; and a protective ring is connected to the top centrifugal impeller and the bottom centrifugal impeller and sleeved on the stator assembly; and a plurality of magnets are fixed between the top centrifugal impeller and the bottom centrifugal impeller in an annular distribution and are spaced from the stator assembly respectively. As described in claim 1, the outer rotor motor device of the drone, wherein the inner sleeve further comprises: an inner ring body, which is spaced apart from the cylinder portion; and an annular base, which is integrally connected to the cylinder portion and the inner ring body, and has a plurality of wiring holes, which are respectively connected to the first axial channels. The external rotor motor device of the drone as described in claim 1, wherein the bottom centrifugal impeller further comprises: a bottom impeller collar, which is sleeved and fixed on the second bearing; a bottom impeller ring, which is connected to the bottom impeller collar; and a bottom assembly ring, which is circumferentially connected to the bottom impeller ring for assembly to the protective ring. The external rotor motor device of the drone as described in claim 3, wherein the bottom assembly ring further comprises: a set of connection ring plates, which surround the bottom impeller ring plate; A plurality of connecting ribs, which are respectively connected to the bottom impeller ring plate and the set of connection ring plates; and a bottom docking convex ring, which protrudes from the set of connection ring plates and is used to insert the protective ring. As described in claim 4, the outer rotor motor device of the drone, wherein the bottom centrifugal impeller further comprises a plurality of first bottom buckle structures, the first bottom buckle structures respectively protrude outwardly from the bottom docking convex ring in a radial shape, and the first bottom buckle structures are arranged around each other at intervals, the protective ring further comprises a protective ring bottom edge, the protective ring bottom edge has a plurality of second bottom buckle structures, the second bottom buckle structures are arranged around each other at intervals, and are used to respectively correspond to and buckle the first bottom buckle structures. As described in claim 4, the external rotor motor device of the drone, wherein the connecting ribs further form a plurality of bottom air ducts between the bottom impeller ring and the assembly ring, and the bottom air ducts are respectively connected to the second axial channels. The external rotor motor device of the drone as described in claim 1, wherein the top centrifugal impeller further comprises: a top impeller collar, which is sleeved and fixed on the first bearing; a top impeller ring, which is circumferentially connected to the top impeller collar; and a top docking convex ring, which protrudes from the top impeller ring and is used to be inserted into the protective ring. As described in claim 7, the external rotor motor device of the drone, wherein the top centrifugal impeller further comprises a plurality of first top buckle structures, the first top buckle structures respectively protrude outwardly from the top docking convex ring in a radial shape, and the first top buckle structures are arranged around each other at intervals, the protective ring further comprises a protective ring top edge, the protective ring top edge has a plurality of second top buckle structures, the second top buckle structures are arranged around each other at intervals, and are used to respectively correspond to and buckle the first top buckle structures. As described in claim 7, the external rotor motor device of the drone, wherein the top centrifugal impeller further includes an air guide ring cover, the air guide ring cover is fixed to the top impeller collar, and radiates outwardly with a plurality of top air ducts, and the top impeller ring disk further opens a plurality of axial connecting holes, and the axial connecting holes are respectively connected to the second axial channels and the top air ducts. As described in claim 7, the external rotor motor device of the drone, wherein the top docking convex ring further has a plurality of magnet fixing ribs, the magnet fixing ribs protrude toward the bottom centrifugal impeller, and are arranged at intervals from each other, and the magnets are respectively embedded between the magnet fixing ribs.

Images