CN218243140U - Outer rotor assembly of direct current brushless motor and direct current brushless motor - Google Patents
Outer rotor assembly of direct current brushless motor and direct current brushless motor Download PDFInfo
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- CN218243140U CN218243140U CN202222409675.4U CN202222409675U CN218243140U CN 218243140 U CN218243140 U CN 218243140U CN 202222409675 U CN202222409675 U CN 202222409675U CN 218243140 U CN218243140 U CN 218243140U
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- magnet steel
- wall
- brushless
- casing
- rotor assembly
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 113
- 239000010959 steel Substances 0.000 claims abstract description 113
- 239000000463 material Substances 0.000 claims abstract description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 7
- 239000003292 glue Substances 0.000 claims description 10
- 229910001172 neodymium magnet Inorganic materials 0.000 description 4
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The utility model belongs to the technical field of the motor, in particular to brushless DC motor's external rotor assembly and have brushless DC motor of this external rotor assembly. It includes the casing, and the casing is cylindric, and open-top, bottom center are equipped with pivot, its characterized in that: the inside of casing be equipped with magnetic assembly along the lateral wall, magnetic assembly including connecting the magnet steel holding assembly on shells inner wall to and the magnet steel holding assembly connect and with casing fixed connection's magnet steel, the magnet steel adopt ferrite material to make, the magnet steel include magnet steel body, magnet steel body has curved outer wall and ventral surface, magnet steel body's outer wall is fixed on the inside wall of casing, magnet steel body's both sides face is perpendicular with the tangent plane on outer wall summit, the utility model discloses to the structure of magnet steel and the improvement that magnet steel held the subassembly structure, promoted the reliability of being connected of magnet steel and casing, also guaranteed brushless DC motor's performance simultaneously and not reduced by a wide margin.
Description
Technical Field
The utility model belongs to the technical field of the motor, in particular to brushless DC motor's external rotor assembly and have brushless DC motor of this external rotor assembly.
Background
The brushless outer rotor motor is widely applied to various fields because of large power density and small volume, and comprises an inner stator and an outer rotor, wherein the inner stator is installed in a shell of the air compressor and is provided with a stator winding, and a main body of the outer rotor surrounds the periphery of the inner stator and is provided with a magnetic pole. However, the magnetic poles of the outer rotor are usually made of neodymium iron boron (ndfeb) material, and the ndfeb material needs expensive rare earth, so that the cost of the brushless outer rotor motor is higher than that of other motors.
In addition, the magnetic steel made of the existing ferrite is divided into a plurality of small magnetic steels in the radial direction by taking a circle center as a center, the magnetic steel is fixedly connected with the shell only through the bonding between the outer arc surface of the magnetic steel and the shell, the connection is not reliable, the problem of looseness is easy to occur, and in the bonding process, glue overflowing at the two ends of the magnetic steel needs to be cleaned.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model discloses a brushless DC motor's external rotor assembly and brushless DC motor.
The technical scheme of the utility model as follows:
the utility model provides a brushless DC motor's external rotor subassembly, its includes the casing, and the casing is cylindric, open-top, and the bottom center is equipped with pivot, its characterized in that: the inside of casing be equipped with magnetic component along the lateral wall, magnetic component including connecting the magnet steel holding assembly on shells inner wall to and the magnet steel holding assembly connect and with casing fixed connection's magnet steel, the magnet steel adopt ferrite material to make, the magnet steel include magnet steel body, magnet steel body has curved outer wall and ventral surface, magnet steel body's outer wall is fixed on the inside wall of casing, magnet steel body's both sides face is perpendicular with the tangent plane on outer wall summit.
Furthermore, an arc chamfer is arranged between the ventral surface and the side surface.
Further, the magnet steel holding assembly comprises an annular base, the annular base is fixedly installed at the bottom of the shell, a plurality of limiting columns are arranged on the surface of the annular base at equal intervals, the outer side faces of the limiting columns are tightly attached to the inner side wall of the shell, the cross sections of the limiting columns are square, the magnet steel is arranged between the adjacent limiting columns, and glue containing spaces are formed between the side walls of the limiting columns and the side walls of the magnet steel.
Furthermore, the positions of the left side surface and the right side surface of the magnetic steel, which are close to the ventral surface, are abutted against the side surfaces of the limiting columns.
Furthermore, the radius of the outer wall of the magnetic steel is 26.3mm, and the radius of the ventral surface is 23.4mm.
Furthermore, the distance between the two side surfaces of the magnetic steel body is 13mm.
Furthermore, the number of the magnetic steel is 10.
A DC brushless motor, characterized in that: the outer rotor assembly comprises the DC brushless motor.
Furthermore, the clearance between the stator assembly and the outer rotor assembly is 0.4mm.
To sum up, the utility model discloses following beneficial effect has:
the utility model discloses a brushless DC motor's external rotor subassembly, the structure to the magnet steel has improved, the terminal surface at magnet steel both ends is perpendicular with the tangent plane on outer wall summit, when the outer wall of magnet steel is fixed with the inner wall laminating of casing, the terminal surface at magnet steel both ends is not perpendicular to the inner wall of casing, when magnet steel and magnet steel holder assembly, can form one between the side of the spacing post of magnet steel holder and magnet steel and the casing and hold gluey space, can hold the glue that overflows from the magnet steel both sides, and the magnet steel left and right sides face offsets near the side of ventral surface department and spacing post, also play a spacing fixed effect, the utility model discloses the magnet steel of rotor subassembly improves, has promoted magnet steel and casing and with the magnet steel holder between be connected the reliability, and has reached the same electric performance of the motor that the neodymium iron boron magnet steel was made basically.
Drawings
Fig. 1 is a front view schematically illustrating an outer rotor assembly according to the present invention;
FIG. 2 is an enlarged schematic view of FIG. 1 at A;
fig. 3 is a schematic cross-sectional view of the outer rotor assembly of the present invention;
FIG. 4 is a schematic view of the structure of magnetic steel;
FIG. 5 is a comparison graph of the torque test of the motor of the present embodiment and the conventional AlFeB motor;
in the figure 1 there is shown a housing,
2 is a rotating shaft, and the rotating shaft is a rotating shaft,
3 is magnetic component, 30 is magnet steel holding assembly, 31 is the magnet steel, 310 is the magnet steel body, 311 is the outer wall, 312 is the ventral surface, 313 is the side, 301 is annular base, 302 is spacing post, 303 is for holding gluey space.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 to 4, an outer rotor assembly of a brushless dc motor includes a housing 1, the housing 1 is cylindrical, the top of the housing is open, and a rotating shaft 2 is disposed at the center of the bottom of the housing, and the outer rotor assembly is characterized in that: casing 1's inside be equipped with magnetic component 3 along the lateral wall, magnetic component 3 including connecting magnet steel holding assembly 20 on shells inner wall to and magnet steel holding assembly 30 connect and with casing fixed connection's magnet steel 31, magnet steel 31 adopt the ferrite material to make, magnet steel 31 include magnet steel body 310, magnet steel body has curved outer wall 311 and ventral surface 312, magnet steel body 310's outer wall is fixed on the inside wall of casing, magnet steel body 310's both sides face 313 is perpendicular with the tangent plane on outer wall summit.
The utility model discloses improve external rotor subassembly, specifically redesign has been carried out to the shape of the magnet steel of external rotor subassembly, the structure of the tangent plane on perpendicular to outer wall summit is adopted to the both sides face of magnet steel body, the magnetic property of the magnet steel that ferrite material made has been guaranteed, combine the clearance between adjustment external rotor subassembly and the stator module to reach and adopt the motor performance that neodymium iron boron magnetic steel is the same basically, thereby realized having guaranteed the basic invariance of motor performance when reducing motor cost.
Further, a circular chamfer is provided between the ventral surface 312 and the side surface 313.
Further, the magnetic steel holding assembly 30 includes an annular base 301, the annular base 301 is fixedly installed at the bottom of the casing 1, a plurality of limiting columns 302 are equidistantly arranged on the surface of the annular base 301, the outer side surfaces of the limiting columns 302 are tightly attached to the inner side wall of the casing 1, the cross sections of the limiting columns 302 are square, the magnetic steel 31 is arranged between the adjacent limiting columns 302, a glue containing space 303 is formed between the side wall of each limiting column 302 and the side wall of the magnetic steel 31, the structure of the magnetic steel holding assembly is limited in the glue containing space, the two side surfaces of the magnetic steel body are perpendicular to the tangent plane of the vertex of the outer wall, the side surfaces of the limiting columns are opposite in the radial direction, a glue containing space is formed between the two side surfaces of the magnetic steel body and the limiting columns, glue overflowing from the two ends of the magnetic steel can be contained, meanwhile, the connection strength between the side surfaces of the magnetic steel body and the magnetic steel holding frame can be increased through the overflowed glue, and the connection reliability between the magnetic steel, the magnetic steel holding frame and the casing is guaranteed.
Furthermore, the positions of the left side surface and the right side surface of the magnetic steel 31, which are close to the ventral surface, are abutted against the side surfaces of the limiting columns, the limiting columns have a physical limiting function on the magnetic steel, and the magnetic steel is not easy to be separated from the radial direction between the two limiting columns and can only be separated from the axial direction of the shell.
Furthermore, the radius of the outer wall 311 of the magnetic steel 31 is 26.3mm, and the radius of the ventral surface 312 is 23.4mm.
Further, the distance between the two side surfaces of the magnetic steel body 310 is 13mm.
Further, the number of the magnetic steel 310 is 10.
A DC brushless motor, characterized in that: the outer rotor assembly comprises the direct current brushless motor.
Further, the gap between the stator assembly and the outer rotor assembly is 0.4mm, specifically, the gap between the outer peripheral surface of the stator assembly and the ventral surface of the magnetic steel of the outer rotor assembly, where the gap between the stator assembly and the outer rotor assembly is reduced to raise the torque of the dc brushless motor, so that the performance of the motor is basically unchanged while the cost is reduced by using ferrite magnetic steel, and the specific performance comparison is shown in fig. 5.
To sum up, the utility model discloses following beneficial effect has:
the utility model discloses a brushless DC motor's external rotor subassembly, the structure to the magnet steel has improved, the terminal surface at magnet steel both ends is perpendicular with the tangent plane on outer wall summit, when the outer wall of magnet steel is fixed with the inner wall laminating of casing, the terminal surface at magnet steel both ends is not perpendicular to the inner wall of casing, when magnet steel and magnet steel holder assembly, can form one between the side of the spacing post of magnet steel holder and magnet steel and the casing and hold gluey space, can hold the glue that overflows from the magnet steel both sides, and the magnet steel left and right sides face offsets near the side of ventral surface department and spacing post, also play a spacing fixed effect, the utility model discloses the magnet steel of rotor subassembly improves, has promoted magnet steel and casing and with the magnet steel holder between be connected the reliability, and has reached the same electric performance of the motor that the neodymium iron boron magnet steel was made basically.
Claims (9)
1. The utility model provides a brushless DC motor's external rotor subassembly, its includes the casing, and the casing is cylindric, open-top, and the bottom center is equipped with pivot, its characterized in that: the inside of casing be equipped with magnetic component along the lateral wall, magnetic component including connecting the magnet steel holding assembly on shells inner wall to and the magnet steel holding assembly connect and with casing fixed connection's magnet steel, the magnet steel adopt ferrite material to make, the magnet steel include magnet steel body, magnet steel body has curved outer wall and ventral surface, magnet steel body's outer wall is fixed on the inside wall of casing, magnet steel body's both sides face is perpendicular with the tangent plane on outer wall summit.
2. The external rotor assembly of a dc brushless motor according to claim 1, wherein: and an arc chamfer is arranged between the ventral surface and the side surface.
3. The external rotor assembly of a dc brushless motor according to claim 1, wherein: the magnetic steel holding assembly comprises an annular base, the annular base is fixedly installed at the bottom of the shell, a plurality of limiting columns are arranged on the surface of the annular base at equal intervals, the outer side faces of the limiting columns are tightly attached to the inner side wall of the shell, the cross sections of the limiting columns are square, the magnetic steel is arranged between the adjacent limiting columns, and glue containing spaces are formed between the side walls of the limiting columns and the side walls of the magnetic steel.
4. An external rotor assembly of a brushless dc motor according to claim 3, wherein: the positions of the left and right side surfaces of the magnetic steel, which are close to the ventral surface, are abutted against the side surfaces of the limiting columns.
5. The external rotor assembly of a brushless dc motor according to any one of claims 1-4, wherein: the radius of the outer wall of the magnetic steel is 26.3mm, and the radius of the ventral surface is 23.4mm.
6. The external rotor assembly of the brushless dc motor according to claim 5, wherein: the distance between the two side surfaces of the magnetic steel body is 13mm.
7. The external rotor assembly of a dc brushless motor according to claim 6, wherein: the number of the magnetic steels is 10.
8. A brushless DC motor comprises a stator assembly, and is characterized in that: an external rotor assembly comprising the brushless dc motor according to any one of claims 1 to 7.
9. A dc brushless motor according to claim 8, wherein: the clearance between the stator assembly and the outer rotor assembly is 0.4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222409675.4U CN218243140U (en) | 2022-09-09 | 2022-09-09 | Outer rotor assembly of direct current brushless motor and direct current brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222409675.4U CN218243140U (en) | 2022-09-09 | 2022-09-09 | Outer rotor assembly of direct current brushless motor and direct current brushless motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218243140U true CN218243140U (en) | 2023-01-06 |
Family
ID=84664414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222409675.4U Active CN218243140U (en) | 2022-09-09 | 2022-09-09 | Outer rotor assembly of direct current brushless motor and direct current brushless motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218243140U (en) |
-
2022
- 2022-09-09 CN CN202222409675.4U patent/CN218243140U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No.15, Tianshan Road, high tech Industrial Development Zone, Xinbei District, Changzhou City, Jiangsu Province Patentee after: NidCo Antesa Electric Motor (Changzhou) Co.,Ltd. Address before: No.15, Tianshan Road, high tech Industrial Development Zone, Xinbei District, Changzhou City, Jiangsu Province Patentee before: NIDEC SERVO (CHANGZHOU) Corp. |
|
| CP01 | Change in the name or title of a patent holder |