WO2020173109A1

WO2020173109A1 - Brushless motor equipped with three bearings

Info

Publication number: WO2020173109A1
Application number: PCT/CN2019/113165
Authority: WO
Inventors: 曹天佑; 尹朝清; 桂长青
Original assignee: 曹天佑
Priority date: 2019-02-25
Filing date: 2019-10-25
Publication date: 2020-09-03

Abstract

The present invention relates to a brushless motor equipped with three bearings, comprising an air duct shell (10), a stator assembly (20), a rotor assembly (30), a first bearing (51), a second bearing (52), a third bearing (53), and a front coil holder (60). The first bearing (51) and the second bearing (52) are mounted in a first central through hole (111) of a bearing fixing block (11) of the air duct shell (10). The third bearing (53) is mounted in a third bearing chamber (61) of the front coil holder (60). The stator assembly (20) is fixed on the air duct shell (10). A part of the stator assembly (20) is located in the air duct shell (10), and the other part is located outside the air duct shell (10). The rear end of a rotating shaft (31) of the rotor assembly (30) is inserted from an inner hole of the first bearing (51) and an inner hole of the second bearing (52), respectively. The front coil holder (60) is provided on a stator core (21) of the stator assembly (20). The front end of the rotating shaft (31) is located in an inner hole of the third bearing (53) on the front coil holder (60), and a permanent magnet (32) of the rotor assembly (30) is located in an inner cavity of the stator core (21) of the stator assembly (20). The brushless motor of the present invention has the advantages of reasonable structure, small swing of the rotor assembly, low noise and the like.

Description

Brushless motor with three bearings Technical field

The present invention relates to a small or micro motor, in particular to a motor used in a hair dryer.

Background technique

Small or micro motors, for example, a high-speed permanent magnet brushless motor has a series of advantages such as high power density, small geometric size, fast dynamic response and high operating efficiency. It has broad application prospects in high-speed operation situations, such as hair dryers. A high-speed permanent magnet brushless motor is used.

The brushless motor used in the prior art for the hair dryer only includes two bearings. When the brushless motor is started, the rotor assembly will swing. Especially when the brushless motor is used for the hair dryer, the rotation speed is very high. The assembly swings more severely, causing the permanent magnets on the rotor assembly to scrape onto the stator core of the stator assembly, which will generate sharp noises and easily damage the permanent magnets on the rotor assembly and the stator core of the stator assembly.

Summary of the invention

The technical problem to be solved by the present invention is to avoid the above shortcomings of the prior art and provide a brushless motor equipped with three bearings, which has reasonable structure, small rotor assembly swing, low noise, firm fixing, good heat dissipation, and high wind speed. , The advantages of large air volume and long life.

The technical solutions adopted by the present invention to solve the technical problems are:

Provided is a brushless motor equipped with three bearings, including a hollow air duct housing with openings at both ends, a stator assembly, a rotor assembly and a fan blade; the stator assembly includes a stator core and a stator winding; the rotor assembly includes a rotating shaft And permanent magnet components; the brushless motor further includes a first bearing, a second bearing, a third bearing, and a front frame made of engineering plastics, and the front frame is provided with a third bearing chamber for accommodating the third bearing; The air duct housing is provided with a bearing fixing block capable of accommodating the first bearing and the second bearing. The bearing fixing block is fixed on the inner wall of the air duct housing by at least two ribs, two adjacent to each other. Between the ribs, an air channel for air circulation is formed, the length of the bearing fixing block is less than the length of the air channel housing, the bearing fixing block is provided with a first central through hole; the permanent magnet component is fixed at the The front end of the rotating shaft; the first bearing and the second bearing are installed in the first central through hole of the bearing fixing block of the air duct housing, and the third bearing is installed in the third bearing chamber of the front wire frame , The stator assembly is fixed on the air duct housing, so A part of the stator assembly is located in the air duct housing, and another part of the stator assembly is located outside the air duct housing. The rear end of the rotating shaft of the rotor assembly is separated from the inner hole of the first bearing and the second bearing. The inner hole is inserted, the front wire frame is arranged on the stator core of the stator assembly located outside the air duct housing, the front end of the rotating shaft of the rotor assembly is located in the inner hole of the third bearing on the front wire frame, so The permanent magnet part of the rotor assembly is located in the inner cavity of the stator core of the stator assembly, and the wind blade is located in the air duct housing and fixed at the rear end of the rotating shaft. The first central through hole of the bearing fixing block and the air duct housing share a common central axis. The brushless motor further includes a rear wire frame made of engineering plastics, and the rear wire frame is arranged on the stator core of the stator assembly in the air duct housing. The length of the stator assembly located outside the air duct housing is greater than the length of the stator assembly located inside the air duct housing. The brushless motor further includes a wiring board, a plurality of pins and a plug; one end of each of the plurality of pins is electrically connected to the stator winding of the stator assembly, and the other end of each is electrically connected and fixed to the wiring board. The wiring board; the plug is electrically connected and fixed on the wiring board. The brushless motor further includes a fixing bracket including a cylindrical rear end portion and a cylindrical front end portion coupled with the rear end portion, and the outer diameter of the front end portion is larger than the outer diameter of the rear end portion. The front end is provided with a first cavity for accommodating the rear of the stator assembly, and the rear end is provided with a second central through hole for accommodating the first bearing and the second bearing; The rear end of the bracket is inserted and fixed in the first central through hole of the bearing fixing block of the air duct housing, and the first bearing and the second bearing are installed in the second central through hole of the rear end of the fixed bracket The rear part of the stator assembly is fixed in the first cavity at the front end of the fixing bracket. The top of the fixing seat is provided with a second small bump. The present invention also provides a brushless motor equipped with a bearing assembly, which includes an air duct housing with openings at both ends, a stator assembly, a rotor assembly and a fan blade; the stator assembly includes a stator core and a stator winding; the rotor The assembly includes a shaft and permanent magnet components; the brushless motor also includes a bearing assembly, a front frame made of engineering plastics, and a third bearing. The bearing assembly includes a cylindrical bearing sheath, a first bearing and a second bearing. A bearing, the bearing sheath is provided with a second central through hole for accommodating the first bearing and the second bearing, and the first bearing and the second bearing are installed in the second central through hole of the bearing sheath The front wire frame is provided with a third bearing chamber for accommodating the third bearing; the air duct housing is provided with a bearing assembly fixing block, the bearing assembly fixing block is fixed to the air duct shell by at least two ribs Within the body On the wall, an air channel for air circulation is formed between two adjacent ribs, the length of the bearing assembly fixing block is less than the length of the air channel housing, and the bearing assembly fixing block is provided with a bearing that can accommodate the bearing The first central through hole of the assembly; the permanent magnet component is fixed at the front end of the rotating shaft; the third bearing is installed in the third bearing chamber of the front wire frame, and the stator assembly is fixed to the air duct housing Above, a part of the stator assembly is located in the air duct housing, another part of the stator assembly is located outside the air duct housing, and the front wire frame is arranged on the stator iron of the stator assembly located outside the air duct housing. On the core, the rear end of the rotating shaft of the rotor assembly is inserted into the inner hole of the first bearing and the inner hole of the second bearing of the bearing assembly, and the bearing sheath of the bearing assembly is located between the air duct housing In the first central through hole of the fixed block of the bearing assembly, the front end of the rotating shaft of the rotor assembly is located in the inner hole of the third bearing on the front frame, and the permanent magnet part of the rotor assembly is located in the stator of the stator assembly In the inner cavity of the iron core, the wind blade is located in the air duct housing and fixed at the rear end of the rotating shaft. Compared with the prior art, the beneficial effects of the brushless motor equipped with three bearings of the present invention are:

1. In the present invention, a bearing fixing block capable of accommodating the first bearing and the second bearing is specially arranged in the air duct housing, and a third bearing chamber for accommodating the third bearing is also arranged on the front wire frame; or, the present invention deliberately Set up the bearing assembly with two bearings installed so that the first bearing and the second bearing are directly installed in the bearing sheath of the bearing assembly, and the bearing assembly is then installed in the bearing assembly fixing block in the air duct housing, and at the same time The third bearing is installed in the third bearing chamber of the front wire frame; the use of three bearings increases the fulcrum for fixing the rotating shaft of the rotor assembly, so that when the brushless motor of the present invention starts, the swing of the rotor assembly is reduced, and the swing is smaller. It also avoids the permanent magnet parts of the rotor assembly from scraping onto the stator core of the stator assembly, resulting in low noise; and the first bearing and the second bearing are directly installed in the bearing sheath to form a bearing assembly, making the installation easier;

2. The bearing fixing block located in the air duct shell is fixed on the inner wall of the air duct shell by at least two ribs, and an air duct is formed between the two adjacent ribs, and the wind blades are located in the air duct shell Inside the body, when the motor is running, the fan blades suck air into the rear end of the air duct shell, and then are sent to the front end of the air duct shell through each air channel before being discharged. In this way, under the action of the fan blades, The air enters from one end of the air duct housing through each air duct and then is discharged from the other end of the air duct housing. This structure is very reasonable, so that the brushless motor of the present invention can fully play the role of the fan blade after being used in the hair dryer. , Can make the wind speed of the hair dryer high, the wind volume is large, and the service life will be correspondingly extended;

3. The stator assembly is fixed on the fixed bracket or in the front end of the bearing assembly fixing block, and the fixation is firm; and a part of the stator assembly is located in the air duct housing, and the other part or even most of the stator assembly is located outside the air duct housing. This facilitates the heat dissipation of the stator assembly, so that the brushless motor of the present invention has good heat dissipation, lower temperature rise, and longer service life; 4. The first bearing and the second bearing can dissipate heat axially through the first central through hole, or through Bearing solid The fixed block is dissipated into each air duct through the ribs and then discharged. It can also be discharged through the bearing fixing block through the ribs and then to the air duct housing. The heat dissipation effect is very good; the third bearing is arranged on the third of the front wire frame In the bearing room, the front wire frame is located outside the air duct shell and is in the outside air, and the third bearing room of the front wire frame faces the outside and communicates with the outside, so the heat dissipation effect of the third bearing is better;

5. Without the motor end cover, the stator assembly is directly fixed in the air duct housing, which makes the structure simple and the heat dissipation is good; 6. The elastic element is arranged between the first bearing and the second bearing, so that the first bearing and the second bearing The bearing has a certain pre-pressure, which eliminates the internal clearance of the bearing and is more conducive to reducing noise.

In summary, the brushless motor equipped with three bearings of the present invention has the advantages of reasonable structure, small rotor assembly swing, low noise, firm fixing, good heat dissipation, high wind speed, large air volume and long life.

Description of the drawings

Figure 1 is a schematic diagram of the axonometric projection of a brushless motor equipped with three bearings according to the present invention;

Fig. 2 is a schematic diagram of an axonometric projection of the first embodiment of the brushless motor after disassembly;

Fig. 3 is a schematic front view cross-sectional view of an orthographic projection of the brushless motor embodiment 1 shown in Fig. 2;

4 is a schematic diagram of axonometric projection of the second embodiment of the brushless motor after decomposition;

FIG. 5 is a schematic front view sectional view of an orthographic projection of the brushless motor embodiment 2 shown in FIG. 4;

Fig. 6 is a schematic diagram of the axonometric projection of the air duct housing of the first and second embodiments of the brushless motor;

Fig. 7 is a schematic front sectional view of the front projection of the air duct housing shown in Fig. 6;

Figure 8 is a schematic diagram of axonometric projection of the wire frame before the brushless motor;

Fig. 9 is a schematic diagram of axonometric projection of the fixing bracket of the first and second embodiments of the brushless motor;

Fig. 10 is a front sectional view of the front projection of the fixing bracket shown in Fig. 9;

Fig. 11 is a schematic diagram of the axonometric projection of the third embodiment of the brushless motor after decomposition;

Fig. 12 is a schematic front sectional view of the front projection of the brushless motor shown in Fig. 11;

FIG. 13 is a schematic diagram of an axonometric projection of the air duct housing of the third embodiment of the brushless motor;

Fig. 14 is a schematic diagram of axonometric projection of the air duct housing shown in Fig. 13 in another direction;

Fig. 15 is a schematic front view sectional view of the front projection of the air duct housing shown in Fig. 13;

16 is a schematic diagram of the axonometric projection of the assembly of the bearing assembly and the rotating shaft of the third embodiment of the brushless motor; FIG. 17 is a frontal sectional schematic view of the front projection of the assembly of the bearing assembly and the rotating shaft shown in FIG. 16.

detailed description The present invention will be further described in detail below in conjunction with the drawings.

Example one

Referring to Figures 1 to 3 and Figures 6 to 8, a brushless motor equipped with three bearings, including a duct housing 10 with a hollow inside at both ends, a stator assembly 20, a rotor assembly 30 and a fan blade 40; The stator assembly 20 includes a stator core 21 and a stator winding 22; the rotor assembly 30 includes a rotating shaft 31 and a permanent magnet component 32; the brushless motor also includes a first bearing 51, a second bearing 52, a third bearing 53 and the use of A front wire frame 60 made of engineering plastics, the front wire frame 60 is provided with a third bearing chamber 61 for accommodating the third bearing 53; the air duct housing 10 is provided with the first bearing 51 and the first bearing 51 The bearing fixing block 11 of the two bearings 52, the bearing fixing block 11 is fixed on the inner wall of the air duct housing 10 by at least two ribs 12, and air passages are formed between the two adjacent ribs 12 13, the length of the bearing fixing block 11 is less than the length of the air duct housing 10, the bearing fixing block 11 is provided with a first central through hole 111; the permanent magnet component 32 is fixed to the front end of the rotating shaft 31 The first bearing 51 and the second bearing 52 are installed in the first central through hole 111 of the bearing fixing block 11 of the air duct housing 10, and the third bearing 53 is installed on the first wire frame 60 In the three-bearing chamber 61, the stator assembly 20 is fixed on the air duct housing 10, a part of the stator assembly 20 is located in the air duct housing 10, and another part of the stator assembly 20 is located in the air duct Outside the housing 10, the rear end of the rotating shaft 31 of the rotor assembly 30 is inserted through the inner hole of the first bearing 51 and the inner hole of the second bearing 52, and the front wire frame 60 is arranged in the air duct housing On the stator iron core 21 of the stator assembly 20 outside 10, the front end of the rotating shaft 31 of the rotor assembly 30 is located in the inner hole of the third bearing 53 on the front frame 60, and the permanent magnet component 32 of the rotor assembly 30 Located in the inner cavity of the stator core 21 of the stator assembly 20, the wind blade 40 is located in the air duct housing 10 and fixed to the rear end of the rotating shaft 31.

Referring to Figures 3, 6 and 7, the stator assembly 20 is fixed on the air duct housing 10, and can be directly fixed on the end surface of the bearing fixing block 11 of the air duct housing 10, or as shown in Figures 12 and 13 As shown in the third embodiment of FIG. 15, the bearing fixing block 11 is extended forward and a cylindrical front end 119 that contains the rear end of the stator core 21 of the stator assembly 20 is extended, and the stator core 21 of the stator assembly 20 is rearwardly The end is fixed in the cylindrical front end 119, the cylindrical front end 119 is similar to the structure of the front end 82 of the fixing bracket 80 in FIG. 9; the stator assembly 20 can also be fixed by external parts The air duct housing 10 will be described in detail below with reference to FIGS. 4, 5, 9 and 10.

Referring to FIGS. 2 to 5 and 8, as well as FIGS. 11 and 12 of the third embodiment, the third bearing 53 is arranged in the third bearing chamber 61 of the front wire frame 60, and the front wire frame 60 is located outside the air duct housing 10. It is in the outside air, and the third bearing chamber 61 of the front wire frame 60 faces outward and communicates with the outside, so the heat dissipation effect of the third bearing 53 is better.

6 and 7, in order to strengthen the strength and firmness of the bearing fixing block 11, the number of ribs 12 can be designed to be larger, but not too much. For example, the number of ribs 12 can be 5-10. 6 and 7, in fact, the air duct housing 10, the bearing fixing block 11 and the rib 12 are the same part, of course, they can also be assembled from different parts.

Referring to Figure 7, the first central through hole 111 of the bearing fixing block 11 and the air duct housing 10 have a common central axis.

Referring to Figures 2 to 5 and 8, as well as Figures 11 and 12 of the third embodiment, the brushless motor further includes a rear wire frame 70 made of engineering plastics, and the rear wire frame 70 is set in the On the stator core 21 of the stator assembly 20 in the air duct housing 10. The rear bobbin 70 and the front bobbin 60 are made of engineering plastics, and can also be used as insulation between the stator slots (not shown) of the stator core 21 of the stator assembly 20 and the stator winding 22, see Figures 2 to 5 and 8, the front wire frame 60 is provided with the same number and size of the front convex slots 69 as the stator slots of the stator core 21, and the rear wire frame 70 is also provided with the same number and size as the stator slots of the stator core 21 For the rear convex groove 79 of the size, the front convex groove 69 of the front wire frame 60 and the rear convex groove 79 of the rear wire frame 70 are respectively inserted from the front and rear ends of the stator core 21 into the stator slots of the stator core 21. , The insulation between the stator core 21 and the stator winding 22 can be ensured.

3 and 5, the length of the stator assembly 20 located outside the air duct housing 10 is greater than the length of the stator assembly 20 located in the air duct housing 10; that is, the stator assembly 20 has only a few Part of it is located in the air duct housing 10, and most of the stator assembly 20 is outside the air duct housing 10. This facilitates the heat dissipation of the stator assembly 20, so that the brushless motor of the present invention has good heat dissipation and low temperature rise. Longer life.

Referring to Figures 1 to 5, and Figures 11 and 12 of the third embodiment, for the convenience and firmness of wiring, the brushless motor further includes a wiring board 99, a plurality of pins 98 and a plug 97; each of the plurality of pins 98 One end of each is electrically connected to the stator winding 22 of the stator assembly 20, and the other end of each is electrically connected to the wiring board 99 and fixed to the wiring board 99; the plug 97 is electrically connected and fixed to the wiring board 99 . Referring to Fig. 1 and Fig. 8, each pin 98 can be fixed to each boss 68 on the front end surface of the front wire frame 60, and then the stator winding 22 and each pin 98 are electrically connected. Example two

The second embodiment is basically the same as the first embodiment. The difference is that the fixing method of the stator assembly 20 is different. Refer to Figure 4, Figure 5, Figure 9 and Figure 10, in order to facilitate the installation of the stator assembly 20 and make the stator assembly 20 fixed firmly The brushless motor further includes a fixing bracket 80, which includes a cylindrical rear end 81 and a cylindrical front end 82 connected to the rear end 81. The outer diameter of the front end 82 is larger than The outer diameter of the rear end 81, the front end 82 is provided with a first cavity 821 for accommodating the rear of the stator assembly 20, and the rear end 81 is provided for accommodating the first bearing 51 and The second central through hole 811 of the second bearing 52; the rear end 81 of the fixing bracket 80 is inserted and fixed in the first central through hole 111 of the bearing fixing block 11 of the air duct housing 10, the first bearing 51 and the second bearing 52 are installed in the second central through hole 811 of the rear end 81 of the fixing bracket 80, and the rear of the stator assembly 20 is fixed on the Said fixing bracket 80 is inside the first cavity 821 of the front end 82. The main function of the end 81 behind the fixing bracket 80 is to insert into the first central through hole 111 of the bearing fixing block 11 of the air duct housing 10 to fix the stator assembly 20 firmly. Of course, the end 81 behind the fixing bracket 80 has another function. It is used to install the first bearing 51 and the second bearing 52, and the main function of the front end 82 of the fixing bracket 80 is to facilitate the installation and fixing of the stator assembly 20. The front end 82 of the fixing bracket 80 is also provided with a second cavity 822 for receiving the end of the rear wire frame 70.

9 and 10, in order to better heat the stator assembly 20, the front end 82 of the fixing bracket 80 is provided with at least one notch 823. In the figure, the front end 82 of the fixing bracket 80 is evenly provided with three notches 823. Example three

The third embodiment is basically the same as the first embodiment, except that the first bearing 51 and the second bearing 52 are directly installed in the bearing sheath 58 to form the bearing assembly 50, in order to be different from the first and second embodiments. , The air duct shell is indicated by the label 10A, specifically:

Referring to Figure 1, Figure 11 to Figure 17, a brushless motor equipped with three bearings, including a hollow air duct housing 10A at both ends, a stator assembly 20, a rotor assembly 30 and a blade 40; The stator assembly 20 It includes a stator core 21 and a stator winding (not shown); the rotor assembly 30 includes a shaft 31 and a permanent magnet component 32; the brushless motor also includes a bearing assembly 50, a front frame 60 made of engineering plastics, and a first Three bearings 53, the bearing assembly 50 includes a cylindrical bearing sheath 58, a first bearing 51 and a second bearing 52, and the bearing sheath 58 is provided to accommodate the first bearing 51 and the second bearing 52 The bearing sheath 58 can be made of metal material, for example, the bearing sheath 58 is made of stainless steel, and the first bearing 51 and the second bearing 52 are installed in the bearing In the second central through hole 588 of the sheath 58; the front wire frame 60 is provided with a third bearing chamber 61 for accommodating the third bearing 53; a bearing assembly fixing block 11 is provided in the air duct housing 10A, The bearing assembly fixing block 11 is fixed on the inner wall of the air duct housing 10A through at least two ribs 12, and an air passage 13 for air circulation is formed between two adjacent ribs 12, the bearing assembly fixing block The length of 11 is less than the length of the air duct housing 10A, the bearing assembly fixing block 11 is provided with a first central through hole 111 that can accommodate the bearing assembly 50; the permanent magnet component 32 is fixed to the rotating shaft 31 The third bearing 53 is installed in the third bearing chamber 61 of the front frame 60, the stator assembly 20 is fixed on the air duct housing 10A, and a part of the stator assembly 20 is located in the In the air duct housing 10A, another part of the stator assembly 20 is located outside the air duct housing 10A, and the front wire frame 60 is arranged on the stator core 21 of the stator assembly 20 located outside the air duct housing 10A The rear end of the rotating shaft 31 of the rotor assembly 30 is inserted from the inner hole of the first bearing 51 and the inner hole of the second bearing 52 of the bearing assembly 50, and the bearing sheath 58 of the bearing assembly 50 is located in the In the first central through hole 111 of the bearing assembly fixing block 11 of the air duct housing 10A, the front end of the rotating shaft 31 of the rotor assembly 30 is located in the inner hole of the third bearing 53 on the front wire frame 60, and the rotor Component 30 The permanent magnet component 32 is located in the inner cavity of the stator core 21 of the stator assembly 20, and the wind blade 40 is located in the air duct housing 10A and fixed to the rear end of the rotating shaft 31.

Referring to Figure 15, the first central through hole 111 of the bearing assembly fixing block 11 and the air duct housing 10A have the same central axis.

Referring to Figures 12 to 15, in order to facilitate the installation of the stator assembly 20 and secure the stator assembly 20 firmly, the front end of the bearing assembly fixing block 11 of the air duct housing 10A is also provided with a cylindrical front end 119, the front end The portion 119 is provided with a first cavity 1199 for accommodating the rear of the stator assembly 20; the rear of the stator assembly 20 is fixed to the first cavity of the front end 119 of the bearing assembly fixing block 11 of the air duct housing 10A. Cavity 1199. The front end 119 is also provided with a second cavity 1197, which is used to accommodate the end of the rear bobbin 70.

Referring to Figure 13, in order to better heat the stator assembly 20, the front end 119 of the bearing assembly fixing block 11 is provided with at least one notch 1198, and the front end 119 in the figure is evenly provided with three notches 1198. Referring to Figures 2 to 5, Figure 11 and Figure 17, in order to eliminate the internal clearance of the first bearing 51 and the second bearing 52 and reduce noise, the brushless motor or the bearing assembly 50 further includes The elastic element 59 between the bearing 51 and the second bearing 52; the two ends of the elastic element 59 are respectively pressed between the outer ring of the first bearing 51 and the outer ring of the second bearing 52, giving the first bearing 51 and the second bearing 52—a fixed pre-pressure to eliminate the internal clearance of the first bearing 51 and the second bearing 52, which is more conducive to reducing noise, because the first bearing 51 and the second bearing 52 generally use ball bearings, while ball bearings Including the inner ring and outer ring, as well as the balls and cages between the inner ring and the outer ring, there is a clearance inside the ball bearing. After a certain amount of pre-pressure is given to the bearing, the outer ring of the bearing will squeeze the ball, and the ball will squeeze Inner ring, this eliminates the internal clearance of the bearing. The elastic element 59 may be a spring. The above-mentioned embodiments only express the preferred embodiments of the present invention. The description is more specific and detailed, but it should not be interpreted as a limitation on the scope of the present invention; it should be noted that for those of ordinary skill in the art Under the premise of not departing from the concept of the present invention, several modifications and improvements can be made, which belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made to the scope of the claims of the present invention shall belong to the present invention. The scope of invention claims.

Claims

Rights request

1. A brushless motor equipped with three bearings, comprising a hollow air duct housing (10) with openings at both ends, a stator assembly (20), a rotor assembly (30) and a fan blade (40); the stator assembly ( 20) Including a stator core (21) and stator windings; the rotor assembly (30) includes a rotating shaft (31) and a permanent magnet component (32); characterized by:

It also includes a first bearing (51), a second bearing (52), a third bearing (53), and a front wire frame (60) made of engineering plastics, and the front wire frame (60) is provided to accommodate the third bearing (53) the third bearing chamber (61); the air duct housing (10) is provided with a bearing fixing block (11) capable of accommodating the first bearing (51) and the second bearing (52), the The bearing fixing block (11) is fixed on the inner wall of the air duct housing (10) through at least two ribs (12), and an air-circulating air duct (13) is formed between two adjacent ribs (12). ), the length of the bearing fixing block (11) is less than the length of the air duct housing (10), the bearing fixing block (11) is provided with a first central through hole (111); the permanent magnet component ( 32) fixed on the front end of the rotating shaft (31); the first bearing (51) and the second bearing (52) are installed on the first center of the bearing fixing block (11) of the air duct housing (10) In the through hole (111), the third bearing (53) is installed in the third bearing chamber (61) of the front wire frame (60), and the stator assembly (20) is fixed to the air duct housing ( 10), a part of the stator assembly (20) is located in the air duct housing (10), and another part of the stator assembly (20) is located outside the air duct housing (10), and the rotor assembly The rear end of the rotating shaft (31) of (30) is inserted from the inner hole of the first bearing (51) and the inner hole of the second bearing (52), and the front wire frame (60) is arranged in the air duct housing (10) On the stator core (21) of the outer stator assembly (20), the front end of the rotating shaft (31) of the rotor assembly (30) is located between the third bearing (53) on the front wire frame (60) In the inner hole, the permanent magnet component (32) of the rotor assembly (30) is located in the inner cavity of the stator core (21) of the stator assembly (20), and the wind blade (40) is located in the air duct The housing (10) is fixed at the rear end of the rotating shaft (31).

2. The brushless motor equipped with three bearings according to claim 1, characterized in that:

It also includes a rear wire frame (70) made of engineering plastics, and the rear wire frame (70) is arranged on the stator core (21) of the stator assembly (20) located in the air duct housing (10) .

3. The brushless motor equipped with three bearings according to claim 1, characterized in that:

The length of the stator assembly (20) located outside the air duct housing (10) is greater than the length of the stator assembly (20) located inside the air duct housing (10).

4. The brushless motor equipped with three bearings according to claim 1, characterized in that:

It also includes a terminal block (99), multiple pins (98) and a plug (97); each end of the multiple pins (98) is divided into Do not be electrically connected to the stator windings of the stator assembly (20), and each other end is electrically connected to the terminal board (99) and fixed to the terminal board (99); the plug (97) is electrically connected and fixed to the terminal board (99); On the terminal block (99).

5. The brushless motor equipped with three bearings according to claim 1, characterized in that:

It also includes a fixing bracket (80), which includes a cylindrical rear end (81) and a cylindrical front end (82) connected to the rear end (81). The front end (80) The outer diameter of 82) is greater than the outer diameter of the rear end (81), the front end (82) is provided with a first cavity (821) for accommodating the rear of the stator assembly (20), and the rear The end (81) is provided with a second central through hole (811) for accommodating the first bearing (51) and the second bearing (52); the rear end (81) of the fixing bracket (80) is inserted and fixed in In the first central through hole (111) of the bearing fixing block (11) of the air duct housing (10), the first bearing (51) and the second bearing (52) are mounted on the fixing bracket (80) ) In the second central through hole (811) of the rear end (81), the rear of the stator assembly (20) is fixed to the first cavity (821) of the front end (82) of the fixing bracket (80) Inside.

6. The brushless motor equipped with three bearings according to claim 1, characterized in that:

It also includes an elastic element (59) installed between the first bearing (51) and the second bearing (52).

7. A brushless motor equipped with three bearings, including a hollow air duct housing (10A) with openings at both ends and a stator assembly

(20), the rotor assembly (30) and the wind blade (40); the stator assembly (20) includes a stator core (21) and stator windings; the rotor assembly (30) includes a rotating shaft (31) and a permanent magnet component ( 32), which is characterized by:

It also includes a bearing assembly (50), a front frame (60) made of engineering plastics, and a third bearing (53). The bearing assembly (50) includes a cylindrical bearing sheath (58) and a first bearing ( 51) and a second bearing (52), the bearing sheath (58) is provided with a second central through hole (588) for accommodating the first bearing (51) and the second bearing (52), the first A bearing (51) and a second bearing (52) are installed in the second central through hole (588) of the bearing sheath (58); the front wire frame (60) is provided with a device for accommodating the third bearing ( 53) the third bearing chamber (61); the air duct housing (10A) is provided with a bearing assembly fixing block (11), the bearing assembly fixing block (11) is fixed in the housing by at least two ribs (12) On the inner wall of the air duct housing (10A), an air duct (13) for air circulation is formed between two adjacent ribs (12), and the length of the bearing assembly fixing block (11) is less than that of the wind The length of the housing (10A), the bearing assembly fixing block (11) is provided with a first central through hole (111) that can accommodate the bearing assembly (50); the permanent magnet component (32) is fixed at the The front end of the rotating shaft (31); the third bearing (53) is installed in the third bearing chamber (61) of the front wire frame (60), and the stator assembly (20) is fixed to the air duct housing (10A), a part of the stator assembly (20) is located in the air duct housing (10A), and another part of the stator assembly (20) is located outside the air duct housing (10A), the The front wire frame (60) is arranged on the stator core (21) of the stator assembly (20) located outside the air duct housing (10A) Above, the rear end of the rotating shaft (31) of the rotor assembly (30) is inserted into the inner hole of the first bearing (51) and the inner hole of the second bearing (52) of the bearing assembly (50), and The bearing sheath (58) of the bearing assembly (50) is located in the first central through hole (111) of the bearing assembly fixing block (11) of the air duct housing (10A), and the rotating shaft of the rotor assembly (30) The front end of (31) is located in the inner hole of the third bearing (53) on the front frame (60), and the permanent magnet component (32) of the rotor assembly (30) is located in the stator of the stator assembly (20) In the inner cavity of the iron core (21), the wind blade (40) is located in the air duct housing (10A) and fixed at the rear end of the rotating shaft (31).

8. The brushless motor equipped with three bearings according to claim 7, characterized in that:

The front end of the bearing assembly fixing block (11) of the air duct housing (10A) is also provided with a cylindrical front end (119), and the front end (119) is provided for accommodating the stator assembly (20) The first cavity (1199) at the rear; the first cavity at the front end (119) of the bearing assembly fixing block (11) at the rear of the stator assembly (20) fixed to the air duct housing (10A) (1199).

9. The brushless motor equipped with three bearings according to claim 8, characterized in that:

The front end (119) of the bearing assembly fixing block (11) is provided with at least one notch (1198).

10. The brushless motor equipped with three bearings according to claim 7, characterized in that:

The bearing assembly (50) also includes an elastic element (59) installed between the first bearing (51) and the second bearing (52).