CN212278091U

CN212278091U - Brushless motor

Info

Publication number: CN212278091U
Application number: CN202021135493.7U
Authority: CN
Inventors: 高春超
Original assignee: Zhuichuang Technology Suzhou Co Ltd
Current assignee: Dreame Technology Suzhou Co ltd
Priority date: 2020-06-18
Filing date: 2020-06-18
Publication date: 2021-01-01
Anticipated expiration: 2030-06-18

Abstract

The application discloses a brushless motor. The brushless motor comprises a shell, a bearing assembly, a rotor assembly and a stator assembly; the bearing assembly comprises a bearing arranged in the shell and a rotating shaft arranged on the bearing in a penetrating way; the rotor assembly comprises a wind wheel and a magnet which are sleeved on the rotating shaft and are respectively positioned on two sides of the bearing; the stator assembly comprises a stator support and a coil winding wound on the stator support, and the stator support is arranged around the magnet; the distance between the wind wheel and the bearing along the axial direction of the rotating shaft is smaller than the distance between the bearing and the magnet along the axial direction of the rotating shaft. In this way, the brushless motor in this application compact structure and reliable.

Description

Brushless motor

Technical Field

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

Background

An Electric machine (also known as "motor") refers to an electromagnetic device that converts or transmits Electric energy according to the law of electromagnetic induction. The dc motor can be divided according to structure and working principle: brushless dc motors and brushed dc motors. The development time of the brushless motor in China is short, but the brushless motor is rapidly developed along with the increasing maturity and perfection of the technology. The motor is widely applied to fields such as aeromodelling, medical equipment, household appliances and electric vehicles, and the traditional motor has large noise and complex structure, so that a plurality of devices cannot be used in places with strict noise requirements.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the technology, the brushless motor has the characteristic of compact structure.

The technical scheme adopted by the application for solving the technical problem is as follows:

the application provides a brushless motor, includes:

a housing;

the bearing assembly comprises a bearing arranged in the shell and a rotating shaft arranged on the bearing in a penetrating way;

the rotor assembly comprises a wind wheel and a magnet which are sleeved on the rotating shaft and are respectively positioned on two sides of the bearing; and the number of the first and second groups,

the stator assembly comprises a stator support and a coil winding wound on the stator support, and the stator support is arranged around the magnet;

the distance between the wind wheel and the bearing along the axial direction of the rotating shaft is smaller than the distance between the bearing and the magnet along the axial direction of the rotating shaft.

Optionally, the wind wheel includes the wheel cover that the cover was located the pivot outside and connect the wheel casing that the wheel cover set up, the wheel casing is the cladding the wheel cover sets up.

Optionally, the wheel cover is annularly arranged along the circumferential direction of the wheel sleeve, and the side wall of the wheel sleeve is arranged in a gradually expanding manner along the axial direction of the bearing from the wind wheel to the bearing.

Optionally, the length of the wheel cover is greater than the length of the wheel cover.

Optionally, a plurality of reinforcing ribs are arranged at the transition between the wheel sleeve and the wheel cover.

Optionally, a plurality of air guiding ribs extending along the axial direction of the rotating shaft are arranged outside the wheel casing, and each air guiding rib is spirally arranged along the length direction.

Optionally, the bearing is followed two axial ends of pivot are first terminal surface and second terminal surface respectively, first terminal surface is close to the wind wheel sets up, sets for first terminal surface with the wheel cover is followed distance between the axial of pivot is L1, the second terminal surface with magnet is followed distance between the axial of pivot is L2, wherein, L1: l2 is 0.05-0.2.

Alternatively, L1 is 0.2mm to 3 mm.

Alternatively, L2 is 3mm to 10 mm.

Compared with the prior art, the application has the beneficial effects that: through with the wind wheel with the bearing is followed the distance between the axial of pivot is less than the bearing with magnet is followed the distance between the axial of pivot to make brushless motor's structure is compacter, and makes the bearing with the distance between the wind wheel sets up to be less, can make the rotation of rotor is more stable.

Drawings

Fig. 1 is a schematic structural diagram of a brushless motor provided in the present application;

FIG. 2 is an exploded view of the brushless motor of FIG. 1;

fig. 3 is a schematic sectional view of the brushless motor shown in fig. 1 along a-a direction;

figure 4 is a schematic view of the wind rotor of figure 1.

Detailed Description

The present application will now be described in further detail with reference to the accompanying drawings, whereby one skilled in the art can, with reference to the description, make an implementation.

Fig. 1 to 4 illustrate an embodiment of a brushless motor provided herein.

Referring to fig. 1 and 2, in an embodiment, a brushless motor includes a housing 1, a bearing assembly, a rotor assembly 2, and a stator assembly 5; the bearing assembly comprises a bearing 32 arranged in the shell 1 and a rotating shaft 31 arranged on the bearing 32 in a penetrating way, and the shell 1 is used for supporting the bearing; the rotor assembly 2 comprises a wind wheel 21 and a magnet 4 which are sleeved on the rotating shaft 31 and are respectively positioned at two sides of the bearing 32; the stator assembly 5 comprises a stator support 51 and a coil winding wound on the stator support 51, the stator support 51 is arranged around the magnet 4, and the magnet 4 is matched with the stator assembly 5 to drive the magnet 4 to rotate; wherein, the distance between the wind wheel 21 and the bearing 32 along the axial direction of the rotating shaft 31 is smaller than the distance between the bearing 32 and the magnet 4 along the axial direction of the rotating shaft 31. After the coil winding is electrified with direct current, an alternating electric field is generated between the coil winding and the magnet 4 to drive the magnet 4 to rotate, so that the rotating shaft 31 is driven to rotate, the wind wheel 21 rotates together, and electric energy is generated. The principle of generating power by the motor, the stator assembly, and the driving method of the stator assembly are all prior art, and therefore, the details thereof will not be described here.

The technical scheme that this application provided is less than bearing 32 and magnet 4 along the distance between the axial of pivot 31 through the distance between the axial with wind wheel 21 and bearing 32 to make brushless motor's structure compacter, and make the distance between bearing 32 and the wind wheel 21 set up to be less, can make the rotation of rotor more stable.

In an embodiment, the wind wheel 21 includes a wheel cover 211 sleeved outside the rotating shaft 31, and a wheel cover 212 connected to the wheel cover 211, the wheel cover 212 is disposed to cover the wheel cover 211, the wheel cover 211 is used to connect with the rotating shaft 31 to rotate together with the rotating shaft 31, and the wheel cover 212 is used to form an air flow so as to dissipate heat inside the housing 1.

Further, the wheel cover 212 is annularly arranged along the circumferential direction of the wheel hub 211, so that the air flow distribution is more uniform, and the side wall of the wheel hub 211 is gradually expanded from the wind wheel 21 to the bearing 32 along the axial direction of the bearing 32, so that the wheel cover is arranged in a streamline shape, so that the rotating resistance of the wind wheel 21 is smaller, and the noise generated when the wind wheel 21 rotates is smaller due to the smaller resistance, so that the noise of the brushless motor is smaller.

In one embodiment, the length of the wheel cover 212 is greater than that of the wheel hub 211 to extend to cover the bearing 32, so that the installation area of the wind wheel 21 is larger, and the heat dissipation effect is better. And on the other hand, the structure of the brushless motor is matched with that of the bearing 32, so that the whole brushless motor has a more compact structure and a smaller volume.

In one embodiment, a plurality of ribs 212b are provided at the transition between the wheel hub 211 and the wheel cover 212 to enhance the connection strength between the wheel hub 211 and the wheel cover 212, so that the structure of the wind turbine 21 is more reliable.

In an embodiment, referring to fig. 4, a plurality of wind-guiding ribs 212a extending along the axial direction of the rotating shaft 31 are disposed outside the wheel housing 212, and each wind-guiding rib 212a is disposed spirally along a length direction, i.e., along the axial direction of the rotating shaft 31, i.e., along one end of the wheel housing 212 to the other end. The spiral direction of the air guiding rib 212a is consistent with the rotation direction of the rotating shaft 31, so that the air pressure of the air flow in the housing 1 is stronger, and the heat dissipation effect is better. Of course, the installation mode of the air guiding rib 212a is not limited to the above, and a plurality of air guiding sections along the longitudinal direction may be provided, and the installation mode of the air guiding rib 212a for facilitating air flow transportation should be within the scope of the present application.

In an embodiment, referring to fig. 3, two ends of the bearing 32 in the axial direction of the rotating shaft 31 are respectively a first end face and a second end face, the first end face is disposed close to the wind wheel 21, and a distance between the first end face and the wheel hub 211 in the axial direction of the rotating shaft 31 is set to be L1; if set up too big with the distance between the axial of wheel cover 211 along pivot 31 and wheel cover, then the rotation of wind wheel 21 is more strenuous, if set up undersize with the distance between second terminal surface and magnet 4 along the axial of pivot 31, then make easily to produce and interfere between stator module and the bearing 32 to be unfavorable for the long-term operation of motor, consequently, generally get L1: l2 is 0.05 ~ 0.2 for the compact structure of brushless motor, the structure is also more reliable simultaneously.

Specifically, the distance L1 between the first end surface and the wheel hub 211 along the axial direction of the rotating shaft 31 can be between 0.2mm and 3mm, and the transmission effect is optimal.

Specifically, the distance L2 between the second end face and the magnet 4 along the axial direction of the rotating shaft 31 can be 3 mm-10 mm, so that the stator assembly is more reliable in long-term operation while the structure is compact.

While the embodiments of the present application have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in a variety of fields suitable for this application, and further modifications will be readily apparent to those skilled in the art, and it is therefore not intended to be limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims

1. A brushless motor, comprising:

a housing;

2. The brushless motor of claim 1, wherein the wind wheel comprises a wheel sleeve sleeved outside the rotating shaft and a wheel cover connected with the wheel sleeve, and the wheel cover is arranged to cover the wheel sleeve.

3. The brushless electric machine according to claim 2, wherein the wheel housing is annularly arranged in a circumferential direction of the wheel housing, and a side wall of the wheel housing is gradually enlarged in a direction from the wind wheel to the bearing in an axial direction of the bearing.

4. The brushless electric machine of claim 2, wherein the wheel housing has a length greater than a length of the wheel housing.

5. The brushless electric machine of claim 2, wherein a plurality of ribs are provided at the transition between the wheel housing and the wheel cover.

6. The brushless electric machine according to claim 2, wherein a plurality of air-guiding ribs extending in the axial direction of the rotating shaft are provided outside the wheel housing, and each of the air-guiding ribs is provided spirally in the longitudinal direction.

7. The brushless motor according to claim 2, wherein two ends of the bearing in the axial direction of the rotating shaft are a first end surface and a second end surface, respectively, the first end surface is disposed close to the wind wheel, a distance between the first end surface and the wheel hub in the axial direction of the rotating shaft is set to L1, and a distance between the second end surface and the magnet in the axial direction of the rotating shaft is set to L2, wherein L1: l2 is 0.05-0.2.

8. The brushless motor of claim 7, wherein L1 is 0.2mm to 3 mm.

9. The brushless motor of claim 7, wherein L2 is 3mm to 10 mm.