CN216086326U

CN216086326U - Brushless motor

Info

Publication number: CN216086326U
Application number: CN202122024561.3U
Authority: CN
Inventors: 肖炯亮
Original assignee: Guangdong Syma Model Aircraft Industrial Co ltd
Current assignee: Guangdong Syma Model Aircraft Industrial Co ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2022-03-18
Anticipated expiration: 2031-08-25

Abstract

The utility model discloses a brushless motor, which comprises a rotor assembly, wherein the rotor assembly comprises a rotor shell, a motor spindle and a magnet assembly; the motor spindle penetrates through the rotor shell in the axial direction and is fixedly connected with the rotor shell; the magnet assembly is circumferentially and fixedly arranged along the inner wall surface of the rotor shell; at least one heat dissipation hole is formed in the top of the rotor shell, a blocking layer is arranged on the at least one heat dissipation hole, and a plurality of blocking holes are formed in the blocking layer. The utility model can prevent external foreign matters from entering the interior of the motor through the heat dissipation holes, and ensures the safe and stable operation of the brushless motor.

Description

Brushless motor

Technical Field

The utility model relates to the technical field of motors, in particular to a brushless motor.

Background

Present brushless motor generally is used for unmanned aerial vehicle, and unmanned aerial vehicle has certain requirement to motor weight and heat dissipation, so too big louvre must be seted up at the top of motor, and unmanned aerial vehicle is using, in-process such as assembly processing, maintenance, for example fly on the sandy beach, during the sand falls into the louvre very easily, and then get into inside the motor, lead to the motor to rotate and break down.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problems that the existing brushless motor has requirements on the weight and the strength of the motor and is provided with overlarge heat dissipation holes, so that sundries are easy to enter the motor, the processing and the assembly are easy to damage and the like, and the utility model provides the brushless motor aiming at least one defect in the prior art.

The technical scheme adopted by the utility model for solving the technical problems is as follows: constructing a brushless motor comprising a rotor assembly including a rotor housing, a motor shaft, and a magnet assembly;

the motor spindle axially penetrates through the rotor shell and is fixedly connected with the rotor shell;

the magnet assembly is circumferentially and fixedly arranged along the inner wall surface of the rotor shell;

at least one heat dissipation hole is formed in the top of the rotor shell, a blocking layer is arranged on at least one heat dissipation hole, and a plurality of blocking holes are formed in the blocking layer.

Preferably, in the brushless motor of the present invention, the barrier layer is formed on a barrier sheet.

Preferably, in the brushless motor of the present invention, the rotor housing is a housing with an open bottom; the blocking sheet is provided with a through hole for the motor spindle to pass through, and the blocking sheet is fixedly arranged at the inner top of the rotor shell.

Preferably, in the brushless motor of the present invention, two ends of the inner top of the rotor housing are provided with a limiting post, and the blocking sheet is provided with a limiting hole that is fixedly connected with the limiting post in an inserting manner.

Preferably, in the brushless motor according to the present invention, the thickness of the barrier sheet is 0.02mm or more and 1mm or less.

Preferably, in the brushless motor of the present invention, the blocking holes under each of the heat dissipation holes are uniformly spaced.

Preferably, in the brushless motor of the present invention, a distance between the blocking holes under each of the heat dissipation holes is less than or equal to 2 mm.

Preferably, in the brushless motor of the present invention, the blocking plate is fixedly disposed on a top of the magnet assembly.

Preferably, in the brushless motor of the present invention, the magnet assembly includes a ring-shaped magnet holder and a plurality of magnets disposed on the magnet holder at regular intervals;

the blocking piece and the top of the magnet fixing seat are integrally formed.

Preferably, in the brushless motor of the present invention, the brushless motor further includes a stator assembly including a bearing assembly, a stator holder, and a coil member;

the outer ring of the bearing assembly is fixedly connected with the stator fixing seat; the inner ring of the bearing assembly is fixedly connected with the motor spindle; the coil part is fixed on the stator fixing seat; the stator fixing seat is fixed outside.

By implementing the utility model, the following beneficial effects are achieved:

according to the utility model, the blocking layer is arranged at the heat dissipation hole at the top of the rotor shell, and the blocking layer is provided with the plurality of blocking holes, so that external foreign matters are prevented from entering the motor through the heat dissipation hole, and the safe and stable operation of the brushless motor is ensured.

Drawings

The utility model will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic view of the overall structure of a brushless motor according to the present invention;

FIG. 2 is a schematic structural view of a rotor assembly and a stator assembly of the present invention;

fig. 3 is an exploded view of the brushless motor of the present invention;

FIG. 4 is a schematic view of a construction of the barrier panel of the present invention;

FIG. 5 is a schematic view of the construction of the present invention wherein the barrier ribs are fixedly disposed at the top of the rotor housing;

FIG. 6 is a schematic view of the structure of the utility model in which the blocking plate is integrally formed with the top of the magnet holder;

FIG. 7 is a schematic view of the oil bearing and snap ring of the present invention disposed on the motor spindle;

fig. 8 is a schematic view of the structure of the oil bearing and snap ring of the present invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

In the following description, it should be understood that the orientations and positional relationships indicated herein and the like are configured and operated in specific orientations based on the orientations and positional relationships shown in the drawings, and are only for convenience of describing the technical solution, and do not indicate that the indicated devices or elements must have specific orientations, and thus, are not to be construed as limiting the present invention.

As shown in fig. 1 to 3, the present embodiment discloses a brushless motor including a rotor assembly 1 including a rotor housing 11, a motor spindle 12, and a magnet assembly 13. Wherein, the motor spindle 12 axially penetrates through the rotor housing 11 and is fixedly connected with the rotor housing 11; the magnet assembly 13 is fixedly arranged along the circumferential direction of the inner wall surface of the rotor shell 11; at least one heat dissipation hole 111 is formed in the top of the rotor housing 11, a blocking layer is arranged on the at least one heat dissipation hole 111, and a plurality of blocking holes 141 are formed in the blocking layer.

In this embodiment, as shown in fig. 4, the blocking layer may be formed on a blocking sheet 14, and the blocking sheet 14 is provided with a blocking hole region corresponding to the heat dissipation hole 111, where the blocking hole region includes a plurality of blocking holes 141. In some embodiments, the top of the rotor housing 11 is provided with four heat dissipation holes 111 uniformly spaced along the circumferential direction, and correspondingly, the blocking sheet 14 is provided with four blocking hole regions corresponding to the heat dissipation holes 111, and each blocking hole region includes a plurality of blocking holes 141.

In some embodiments, in order to provide strength to the barrier sheet 14 without affecting the installation and weight of the motor, the thickness of the barrier sheet 14 is greater than or equal to 0.02mm and less than or equal to 1 mm.

As shown in fig. 5, the rotor case 11 is a case with an open bottom, the barrier piece 14 is provided with a through hole 142 for the motor spindle 12 to pass through, and the barrier piece 14 is fixedly disposed at the inner top of the rotor case 11. In other embodiments, the barrier sheet 14 may be fixedly disposed on the outer top of the rotor housing 11.

In some embodiments, the manner in which the barrier ribs 14 are fixed to the inner top of the rotor housing 11 may be: the two ends of the inner top of the rotor housing 11 are provided with the limiting posts 112, and the blocking piece 14 is provided with limiting holes 143 which are fixedly inserted into the limiting posts 112 in a matching manner. Further, in order to improve the heat dissipation of the motor, the two ends of the limiting column 112 penetrate in the axial direction.

In order to better block the external foreign matters, the blocking holes 141 under each heat dissipation hole 111 are uniformly spaced, for example, the distance between the blocking holes 141 under each heat dissipation hole 111 is less than or equal to 2 mm. Also, the blocking holes 141 may have a bar shape, a circular shape, or other irregular shapes, which are not listed here.

In some embodiments, as shown in fig. 6, the blocking plate 14 is fixedly disposed on top of the magnet assembly 13. Specifically, the magnet assembly 13 includes a ring-shaped magnet holder 131 and a plurality of magnets 132 uniformly spaced on the magnet holder 131, and the blocking plate 14 is integrally formed on the top of the magnet holder 131.

As shown in fig. 2 and 3, the brushless motor further includes a stator assembly 2, and the rotor assembly 1 is sleeved on the stator assembly 2. The stator assembly 2 includes a bearing assembly, a stator holder 23, and a coil member 24. The outer ring of the bearing assembly is fixedly connected with the stator fixing seat 23; the inner ring of the bearing assembly is fixedly connected with the motor spindle 12; the coil piece 24 is fixed on the stator fixing seat 23; the stator fixing base 23 is fixed to the outside. Wherein, the bearing assembly is tightly matched with the stator fixing seat 23 and the motor spindle 12.

In some embodiments, the bearing assembly comprises a first bearing 21 and a second bearing 22; the stator fixing seat 23 is axially provided with a channel 231, two ends of the inner side wall of the channel 231 are respectively and fixedly connected with the outer rings of the first bearing 21 and the second bearing 22, and the inner rings of the first bearing 21 and the second bearing 22 are respectively and fixedly connected with the motor spindle 12.

In some embodiments, the motor spindle 12 and the bearing assembly are tightly fitted to each other to ensure the accuracy of the horizontal gap, and the whole motor is fixed up and down by the oil bearing 3 and the snap ring 4, specifically, as shown in fig. 7, the brushless motor further includes the oil bearing 3 and the snap ring 4, an annular groove 121 is formed on the outer side wall of one end of the motor spindle 12, the oil bearing is disposed on the outer upper portion of the groove 121, and the snap ring 4 is snapped into the groove 121. As shown in fig. 8, the snap ring 4 is a U-shaped body, the end of the snap ring is a plane inclined outward, and the end of the snap ring is a ring surface matching with the shape of the groove 121.

It is to be understood that the foregoing examples, while indicating the preferred embodiments of the utility model, are given by way of illustration and description, and are not to be construed as limiting the scope of the utility model; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims

1. A brushless motor comprising a rotor assembly (1), characterized in that the rotor assembly (1) comprises a rotor housing (11), a motor spindle (12) and a magnet assembly (13);

the motor spindle (12) penetrates through the rotor shell (11) in the axial direction and is fixedly connected with the rotor shell (11);

the magnet assembly (13) is fixedly arranged along the circumferential direction of the inner wall surface of the rotor shell (11);

the top of the rotor shell (11) is provided with at least one heat dissipation hole (111), a blocking layer is arranged on at least one heat dissipation hole (111), and a plurality of blocking holes (141) are formed in the blocking layer.

2. The brushless electric machine according to claim 1, wherein the barrier layer is formed on a barrier sheet (14).

3. The brushless electric machine according to claim 2, characterized in that the rotor housing (11) is an open-bottomed casing; the blocking sheet (14) is provided with a through hole (142) for the motor spindle (12) to pass through, and the blocking sheet (14) is fixedly arranged at the inner top of the rotor shell (11).

4. The brushless motor according to claim 3, wherein two ends of the inner top of the rotor housing (11) are provided with a limiting post (112), and the blocking piece (14) is provided with a limiting hole (143) which is fixedly inserted into the limiting post (112).

5. The brushless electric machine according to claim 2, wherein the thickness of the barrier sheet (14) is 0.02mm or more and 1mm or less.

6. The brushless motor according to claim 1, wherein the blocking holes (141) are uniformly spaced under each of the heat dissipation holes (111).

7. The brushless motor according to claim 6, wherein a distance between the blocking holes (141) under each of the heat dissipation holes (111) is 2mm or less.

8. The brushless electric machine according to claim 2, characterized in that the blocking plate (14) is fixedly arranged on top of the magnet assembly (13).

9. The brushless motor according to claim 8, wherein the magnet assembly (13) includes a ring-shaped magnet holder (131) and a plurality of magnets (132) disposed on the magnet holder (131) at regular intervals;

the blocking piece (14) and the top of the magnet fixing seat (131) are integrally formed.

10. The brushless electric machine according to claim 1, further comprising a stator assembly (2) including a bearing assembly, a stator holder (23), and a coil member (24);

the outer ring of the bearing assembly is fixedly connected with the stator fixing seat (23); the inner ring of the bearing assembly is fixedly connected with the motor spindle (12); the coil piece (24) is fixed on the stator fixing seat (23); the stator fixing seat (23) is fixed outside.