CN216774472U - Direct-current brushless outer rotor motor - Google Patents
Direct-current brushless outer rotor motor Download PDFInfo
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- CN216774472U CN216774472U CN202220097550.XU CN202220097550U CN216774472U CN 216774472 U CN216774472 U CN 216774472U CN 202220097550 U CN202220097550 U CN 202220097550U CN 216774472 U CN216774472 U CN 216774472U
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Abstract
The utility model discloses a direct-current brushless outer rotor motor, which comprises a shaft, a stator assembly and a rotor assembly, wherein the stator assembly comprises a stator iron core and a coil winding, the rotor assembly comprises a casing sleeve, a plurality of permanent magnets arranged on the inner wall surface of the casing sleeve and an end plate positioned at one end of the casing sleeve, a bearing seat is arranged on the end plate at one end of the casing sleeve of the rotor assembly, bearing chambers are respectively arranged at two ends of the bearing seat, a bearing is arranged in each bearing chamber, the shaft penetrates through the middle of the bearing seat and is supported on the bearing, a central hole is arranged in the middle of the stator iron core, the central hole is a stepped hole and comprises a large-diameter hole and a small-diameter hole, the middle part of the shaft is directly inserted into the small-diameter hole and is connected and fixed with the stator iron core, an accommodating groove is formed between the hole wall of the large-diameter hole and the shaft, and the bearing seat is partially nested in the accommodating groove, therefore, the axial size of the motor can be effectively reduced, the structure is compact, the mounting requirement of the load is met, and the application range is widened.
Description
The technical field is as follows:
the utility model relates to a direct-current brushless outer rotor motor.
Background art:
the existing design scheme of the direct current brushless external rotor motor is that a main body is divided into five parts, the structure of the direct current brushless external rotor motor is shown in figure 1, a rotating shaft 1a, a stator assembly 2a, a rotor assembly 3a, a base 4a and a controller 5a are arranged, a bearing seat sleeve 41a axially protrudes from the middle of the base 4a, bearings are arranged at two ends of the bearing seat sleeve 41, the rotating shaft 1a is supported and arranged on the bearings, the stator assembly 2a is sleeved outside the bearing seat sleeve 41, and the rotor assembly 3a is connected with one end of a shaft and sleeved outside the stator assembly 2 a. The direct-current brushless outer rotor motor with the structure has the following defects: 1) the radial dimension is large, the main stress point for installation is in the bearing seat sleeve 41a, and the radial installation space is limited; 2) the base 4a is used as a fixed pivot for installation, belongs to single-end installation, is unstable, and is easy to generate motor vibration noise.
In view of this, the applicant filed a patent of utility model of external rotor motor on 11/3/2015 with the application numbers: 201520193830.0, which better solves the above technical problems, but still has the disadvantages: 1) the axial dimension is large, the structure is not compact, and the mounting requirement of the load can not be met in many times; 2) the positions of the mounting flange and the bearing seat sleeve which are connected by the wind wheel are axially staggered, so that the bearing is stressed unevenly, the service life of the bearing is influenced, and more motor noises are generated.
The utility model content is as follows:
the utility model aims to provide a direct-current brushless outer rotor motor, which solves the technical problems that the direct-current brushless outer rotor motor in the prior art is large in axial size and not compact in structure, and therefore the installation requirement of a load can not be met in many times.
The utility model further aims to provide a direct-current brushless outer rotor motor, which solves the technical problems that in the prior art, the positions of a mounting flange and a bearing seat sleeve of the direct-current brushless outer rotor motor are axially staggered, so that the stress of a bearing is unbalanced, the service life of the bearing is influenced, and more motor noise is generated.
The purpose of the utility model is realized by the following technical scheme:
the utility model provides a brushless external rotor electric machine of direct current, includes axle, stator module and rotor subassembly, and stator module includes stator core and coil winding, and the rotor subassembly includes the casing sleeve, installs a plurality of permanent magnets on the telescopic internal face of casing and the end plate that is located casing sleeve one end, sets up the bearing frame in the middle of the end plate, installs the bearing respectively at the bearing frame both ends, and the axle passes and the bearing is in from the bearing frame centre on the bearing, the stator module outside is located to the casing sleeve cover, its characterized in that: the middle of the stator core is provided with a central hole which is a stepped hole and comprises a large-caliber hole and a small-caliber hole, the middle part of the shaft is directly inserted into the small-caliber hole and is fixedly connected with the stator core, an accommodating groove is formed between the hole wall of the large-caliber hole and the shaft, and the bearing seat is partially nested in the accommodating groove.
The outer side wall of the casing sleeve is provided with a flange, and the flange is positioned in the middle of the bearing seat in the axial direction.
The large-caliber hole and the small-caliber hole are round holes.
The shaft is also sleeved with a sealing cover, the sealing cover and the casing sleeve cover the stator assembly together, and the end plate and the sealing cover are positioned on two sides of the stator assembly.
One end of the shaft extends from the cover and the other end of the shaft extends from the bearing seat.
A control box is further arranged on one side of the sealing cover, a plurality of circuit boards are mounted in the control box, and the shaft penetrates through the sealing cover, the plurality of control circuit boards and the control box and then extends out.
The circuit boards are arranged side by side along the axial direction.
The control box is connected with the sealing cover in an installing mode, and an opening of the control box is covered by the sealing cover.
And a dust cover is also arranged at the top of the bearing seat.
Compared with the prior art, the utility model has the following effects:
1) the utility model relates to a direct-current brushless outer rotor motor.A bearing seat is arranged on an end plate at one end of a shell sleeve of a rotor assembly, two ends of the bearing seat are respectively provided with a bearing chamber, a bearing is arranged in each bearing chamber, a shaft penetrates through the middle of the bearing seat and is supported on the bearing, a central hole is arranged in the middle of a stator iron core, the central hole is a stepped hole and comprises a large-diameter hole and a small-diameter hole, the middle part of the shaft is directly inserted into the small-diameter hole and is connected and fixed with the stator iron core, an accommodating groove is formed between the hole wall of the large-diameter hole and the shaft, and the bearing seat is partially embedded in the accommodating groove.
2) Other advantages of the present invention are described in detail in the examples section.
Description of the drawings:
fig. 1 is a schematic structural diagram of a dc brushless external rotor motor in the prior art;
FIG. 2 is a structural sectional view of a first embodiment of the present invention;
fig. 3 is a sectional view of a stator assembly according to a first embodiment of the present invention.
The specific implementation mode is as follows:
the present invention will be described in further detail below with reference to specific embodiments and with reference to the accompanying drawings.
The first embodiment is as follows:
as shown in fig. 2 and fig. 3, the embodiment provides a dc brushless external rotor motor, which includes a shaft 1, a stator assembly 2 and a rotor assembly 3, the stator assembly 2 includes a stator core 21 and a coil winding 22, the rotor assembly 3 includes a casing sleeve 30, a plurality of permanent magnets 31 mounted on an inner wall surface of the casing sleeve 30, and an end plate 32 located at one end of the casing sleeve 30, a bearing seat 320 is disposed in the middle of the end plate 32, bearings 4 are respectively mounted at two ends of the bearing seat 320, the shaft 1 passes through the middle of the bearing seat 320 and is supported on the bearings 4, and the casing sleeve 3 is sleeved outside the stator assembly 2, and is characterized in that: the center hole 210 is arranged in the middle of the stator core 21, the center hole 210 is a stepped hole and comprises a large-caliber hole 210a and a small-caliber hole 210b, the middle part of the shaft 1 is directly inserted into the small-caliber hole 210b and is fixedly connected with the stator core 21, an accommodating groove 211 is formed between the hole wall of the large-caliber hole 210a and the shaft 1, and the bearing seat 320 is partially embedded in the accommodating groove 211. The motor can effectively reduce the axial size of the motor, has compact structure, meets the installation requirement of the load, and widens the application range.
The working principle of the utility model is as follows: when the motor is installed, two ends of the shaft 1 are used as installation supporting points, the shaft 1 and the stator core 21 are connected and fixed together and do not rotate along with the rotor assembly 3, a bearing seat 320 is arranged in the middle of an end plate 32 at one end of a casing sleeve 30 of the rotor assembly 3, bearings 4 are respectively installed at two ends of the bearing seat 320, the shaft 1 penetrates through the middle of the bearing seat 320 and is supported on the bearings 4, and the rotor assembly 3 rotates together with the bearing seat 320.
A flange 301 is mounted on the outer side wall of the casing sleeve 30, and the flange 301 is located in the middle of the bearing seat 320 in the axial direction. Therefore, the bearing is relatively balanced in stress, the normal work of the bearing is effectively guaranteed, the service life is prolonged, and the running noise of the motor is reduced.
The large-diameter hole 210a and the small-diameter hole 210b are circular holes, and the diameter of the large-diameter hole 210a is larger than that of the small-diameter hole 210b, so that the structure is simple, and the processing is easy.
The shaft 1 is further sleeved with a cover 5, the cover 5 and the casing sleeve 30 together cover the stator assembly 2, and the end plate 32 and the cover 5 are located on two sides of the stator assembly 2.
One end of the shaft 1 extends from the cover 5, and the other end of the shaft 1 extends from the bearing housing 320.
A control box 6 is further arranged on one side of the sealing cover 5, a plurality of circuit boards 7 are mounted in the control box 6, and the shaft 1 penetrates through the control circuit boards 7 and the control box 6, so that the motor controller and the direct-current brushless outer rotor motor can be mounted together, and the structure is more compact.
The circuit boards 7 are arranged side by side along the axial direction, and the motor controller is distributed on the circuit boards 7 according to the functional circuit, so that the radial size of the whole product can be effectively reduced.
The control box 6 is connected with the sealing cover 5 in an installing mode, the opening of the control box 6 is covered by the sealing cover 5, and the control box is reasonable in structure and compact in size.
The plurality of wiring boards 7 mentioned above means a range of 2 to 5 wiring boards 7.
The top of the bearing seat 320 is also provided with a dust cover 8, so that dust or impurities are effectively prevented from falling into the bearing seat 320 to influence the normal work of the bearing.
The above embodiments are only preferred embodiments of the present invention, but the present invention is not limited thereto, and any other changes, modifications, substitutions, combinations, simplifications, which are made without departing from the spirit and principle of the present invention, are all equivalent replacements within the protection scope of the present invention.
Claims (10)
1. The utility model provides a brushless external rotor electric machine of direct current, including axle (1), stator module (2) and rotor subassembly (3), stator module (2) are including stator core (21) and coil winding (22), rotor subassembly (3) are including casing sleeve (30), install on the internal face of casing sleeve (30) a plurality of permanent magnets (31) and be located end plate (32) of casing sleeve (30) one end, set up bearing frame (320) in the middle of end plate (32), install bearing (4) respectively at bearing frame (320) both ends, axle (1) passes and the supporting is in from bearing frame (320) centre bearing (4) on, stator module (2) outside is located to casing sleeve (30) cover, its characterized in that: the middle of the stator core (21) is provided with a center hole (210), the center hole (210) is a stepped hole and comprises a large-caliber hole (210a) and a small-caliber hole (210b), the middle part of the shaft (1) is directly inserted into the small-caliber hole (210b) and is fixedly connected with the stator core (21), an accommodating groove (211) is formed between the hole wall of the large-caliber hole (210a) and the shaft (1), and part of the bearing seat (320) is embedded into the accommodating groove (211).
2. A dc brushless external rotor motor according to claim 1, wherein: the outer side wall of the casing sleeve (30) is provided with a flange (301), and the flange (301) is positioned in the middle of the bearing seat (320) in the axial direction.
3. A dc brushless external rotor motor according to claim 2, wherein: the large-diameter hole (210a) and the small-diameter hole (210b) are both circular holes.
4. A dc brushless external rotor motor according to claim 1, 2 or 3, wherein: the shaft (1) is further sleeved with a sealing cover (5), the sealing cover (5) and the machine shell sleeve (30) cover the stator assembly (2), and the end plate (32) and the sealing cover (5) are located on two sides of the stator assembly (2).
5. The dc brushless external rotor motor according to claim 4, wherein: one end of the shaft (1) extends from the cover (5), and the other end of the shaft (1) extends from the bearing seat (320).
6. A dc brushless external rotor electric machine according to claim 5, wherein: one side of the sealing cover (5) is also provided with a control box (6), a plurality of circuit boards (7) are arranged in the control box (6), and the shaft (1) penetrates through the sealing cover (5), the plurality of control circuit boards (7) and the control box (6) and then extends out.
7. A dc brushless external rotor electric machine according to claim 6, wherein: a plurality of circuit boards (7) are arranged side by side along the axial direction.
8. A dc brushless external rotor electric machine according to claim 7, wherein: the control box (6) is connected with the sealing cover (5) in an installing way, and the opening of the control box (6) is covered by the sealing cover (5).
9. A dc brushless external rotor electric machine according to claim 8, wherein: the number of circuit boards (7) is in the range of 2 to 5 circuit boards (7).
10. A dc brushless external rotor motor according to claim 1, 2 or 3, wherein: and a dust cover (8) is also arranged at the top of the bearing seat (320).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220097550.XU CN216774472U (en) | 2022-01-14 | 2022-01-14 | Direct-current brushless outer rotor motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220097550.XU CN216774472U (en) | 2022-01-14 | 2022-01-14 | Direct-current brushless outer rotor motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216774472U true CN216774472U (en) | 2022-06-17 |
Family
ID=81977518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220097550.XU Active CN216774472U (en) | 2022-01-14 | 2022-01-14 | Direct-current brushless outer rotor motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216774472U (en) |
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2022
- 2022-01-14 CN CN202220097550.XU patent/CN216774472U/en active Active
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