CN116799991B - Outer rotor motor - Google Patents
Outer rotor motor Download PDFInfo
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- CN116799991B CN116799991B CN202311016005.9A CN202311016005A CN116799991B CN 116799991 B CN116799991 B CN 116799991B CN 202311016005 A CN202311016005 A CN 202311016005A CN 116799991 B CN116799991 B CN 116799991B
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- Prior art keywords
- rotor
- motor
- stator
- rotating shaft
- air outlets
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- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000004804 winding Methods 0.000 claims description 8
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
- 238000000034 method Methods 0.000 claims 1
- 238000009423 ventilation Methods 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- Motor Or Generator Cooling System (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
An outer rotor motor comprises a rotating shaft extending along the axial direction, an outer rotor fixed on the rotating shaft, a fan and an inner stator positioned between the rotating shaft and the outer rotor. The outer rotor comprises a rotor shell covering the inner stator, the rotor shell is provided with an annular wall sleeved on the periphery of the inner stator and an end wall connected to the axial front end of the annular wall, and the end wall is adjacent to the fan and fixed on the rotating shaft. The rotor shell is provided with air outlets which are positioned on the end wall and uniformly distributed along the axial direction, the air outlets are of an asymmetric petal-shaped structure, and the number of the air outlets is odd. Under the same rotating speed, the air outlet with the petal-shaped structure improves the air gap flow between the stator and the rotor of the motor, improves the temperature rise of the motor and prolongs the endurance time of the whole product.
Description
Technical Field
The invention relates to the technical field of motors, in particular to an external rotor motor with good heat dissipation effect.
Background
The common external rotor motor in the market at present mainly comprises an internal stator, an external rotor and a rotating shaft, and the mutual conversion between electric energy and mechanical energy is realized through electromagnetic action. The main heat dissipation air path between the stator and the rotor of the outer rotor motor is shown as follows: outside air flows through the gear box shell, the motor stator and rotor air gap, the motor outer rotor air outlet and the fan blades in sequence. Therefore, the main factors influencing the temperature rise of the motor are the ventilation area of an air gap between the stator and the rotor of the motor and the ventilation area of the outer rotor of the motor. Because the motor air gap is influenced by the number of winding turns among stator slots and the overall arrangement of the rotor magnetic steel structure, the ventilation area of the air gap is basically fixed. Therefore, the current design mostly achieves the purpose of controlling the temperature rise of the motor by changing the ventilation area of the outer rotor. However, the prior art solutions suffer from the drawbacks: 1. the air outlet of the motor outer rotor is designed into a symmetrical porous type, wing type or fan shape, and the design defect is that the air gap flow of the motor stator and rotor is smaller and insufficient to provide the heat dissipation requirement of the motor; 2. radial blade design is often adopted for motor blades, so that the power consumption of the blades is high; the problems cause the temperature of the motor to rise and the endurance time of the whole product to be reduced.
In view of the above, it is desirable to provide an improved external rotor motor that overcomes the shortcomings of the prior art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an outer rotor motor which is provided with an air outlet with an asymmetric petal-shaped structure, so that the air gap flow between a stator and a rotor of the outer rotor motor is improved.
The technical scheme adopted for solving the problems in the prior art is as follows: an outer rotor motor comprises a rotating shaft extending along the axial direction, an outer rotor fixed on the rotating shaft, a fan and an inner stator positioned between the rotating shaft and the outer rotor. The outer rotor comprises a rotor shell covering the inner stator, the rotor shell is provided with an annular wall sleeved on the periphery of the inner stator and an end wall connected to the axial front end of the annular wall, and the end wall is adjacent to the fan and fixed on the rotating shaft. The rotor shell is provided with air outlets which are arranged on the end wall and uniformly distributed along the axial direction, the air outlets are of an asymmetric petal-shaped structure, the number of the air outlets is odd, the inner stator comprises a stator support sleeved on the rotating shaft and a stator core fixedly arranged on the stator support, the stator core is provided with an annular part fixed on the stator support and a plurality of tooth parts protruding outwards from the annular part in the radial direction, the distance from the circumferential outer edge of the air outlets to the circle center is r, the outer edge radius of the tooth parts is d1, the outer edge radius of the annular part is d2, and the ratio of (d1+d2)/2 < r < d1.
The further improvement scheme is as follows: the number of the air outlets is 5.
The further improvement scheme is as follows: the inner stator comprises windings wound on the stator core, and the windings are wound on the corresponding tooth parts.
The further improvement scheme is as follows: the end wall is provided with a rib part between two adjacent air outlets, wherein the thickness of the rib part is L1, and 3mm < L1< (d 1-d 2)/2.
The further improvement scheme is as follows: the fan is located at the axial front end of the end wall and is provided with an annular base fixed on the rotating shaft and a plurality of blades extending from the base in a radial outward bending mode, and the blades are arranged in an arc shape.
The further improvement scheme is as follows: the fan is provided with a circular base plate which protrudes outwards from the axial front end of the base part along the radial direction, and the blades are formed by protruding backwards from the axial rear end surface of the base plate along the axial direction.
The further improvement scheme is as follows: the number of the air outlets is n, and the number of the blades is 2 (n+1).
The further improvement scheme is as follows: the outer rotor comprises a rotor bracket fixedly held on the inner wall surface of the annular wall and a plurality of magnetic steels attached to the inner wall surface of the annular wall, and the magnetic steels are fixed in the rotor shell through the rotor bracket.
The further improvement scheme is as follows: the outer rotor motor is a unidirectional rotating motor or a bidirectional rotating motor.
Compared with the prior art, the invention has the following beneficial effects: the rotor shell is provided with air outlets which are positioned on the end wall and uniformly distributed along the axial direction, the air outlets are of an asymmetric petal-shaped structure, and the number of the air outlets is odd. Under the same rotating speed, the air outlet with the petal-shaped structure improves the air gap flow between the stator and the rotor of the motor, improves the temperature rise of the motor and prolongs the endurance time of the whole product.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings:
fig. 1 is a perspective view of an external rotor motor according to a preferred embodiment of the present invention;
FIG. 2 is a partially exploded view of the outer rotor motor shown in FIG. 1;
FIG. 3 is a partially exploded view of the outer rotor motor of FIG. 1 at another angle;
FIG. 4 is a front view of the rotor housing and fan of the outer rotor motor of FIG. 1;
FIG. 5 is a front view of the rotor housing shown in FIG. 4;
fig. 6 is a front view of the outer rotor motor shown in fig. 1.
Meaning of reference numerals in the drawings:
100. outer rotor motor 10, rotary shaft 20, outer rotor 21, rotor housing 211, annular wall 212, end wall 213, air outlet 214, rib 22, rotor holder 23, magnetic steel 30, inner stator 31, stator holder 311, bearing 32, stator core 321, annular portion 322, tooth portion 33, winding 40, fan 41, base 42, base plate 43, blade
Detailed Description
The terminology used in the present invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Words such as "upper", "lower", "front", "rear", etc., indicating an azimuth or a positional relationship are based on only the azimuth or the positional relationship shown in the drawings, and are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus/elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention.
Referring to fig. 1 to 6, an external rotor motor 100 according to a preferred embodiment of the present invention is shown, and the external rotor motor 100 is generally applied to a power tool, particularly a high pressure washer (not shown). The outer rotor motor 100 includes a rotating shaft 10 extending in an axial direction, an outer rotor 20 fixed on the rotating shaft 10, an inner stator 30 positioned between the rotating shaft 10 and the outer rotor 20, and a fan 40 fixed on the rotating shaft 10. The rotating shaft 10 drives the outer rotor 20 and the fan 40 to rotate together.
Referring to fig. 2 to 3, the outer rotor 20 includes a rotor housing 21 covering the inner stator 30, a rotor support 22 fixed on an inner wall surface of the rotor housing 21, and a plurality of magnetic steels 23 attached to the inner wall surface of the rotor housing 21, wherein the magnetic steels 23 are fixed in the rotor housing 21 through the rotor support 22. The rotor housing 21 is provided with an annular wall 211 sleeved on the outer periphery of the inner stator 30 and an end wall 212 connected to the axial front end of the annular wall 211, and the end wall 212 is disposed adjacent to the fan 40 and fixed on the rotating shaft 10. In this embodiment, the rotor holder 22 and the magnetic steel 23 are both attached to the inner wall surface of the annular wall 211.
The rotor housing 21 is provided with air outlets 213 positioned on the end wall 212, and the air outlets 213 are uniformly distributed along the axial direction, so that not only can good dynamic balance performance be ensured, but also certain rotational rigidity can be ensured. The air outlets 213 are in an asymmetric petal-shaped structure, and the number of the air outlets 213 is an odd number, in this embodiment, the number of the air outlets 213 is 5. Compared with the vent structure of the existing external rotor motor, the air outlet 213 with the petal-shaped structure can reduce 20% of power consumption of the fan 40 at the same rotating speed, and meanwhile, the air gap flow between the stator and the rotor of the motor is improved by 10%, namely, the air gap flow between the stator and the rotor of the motor is improved, and the temperature rise of the motor is improved, so that the endurance time of the whole motor is prolonged.
As shown in fig. 5 and 6, the inner stator 30 includes a stator frame 31 sleeved on the rotating shaft 10, a stator core 32 fixed on the stator frame 31, and a winding 33 wound on the stator core 32, and the stator frame 31 is rotatably connected to the rotating shaft 10 through a bearing 311. The stator core 32 is provided with an annular portion 321 fixed on the stator frame 31 and a plurality of teeth portions 322 protruding outwards from the annular portion 321 in the radial direction, the teeth portions 322 are uniformly distributed in the circumferential direction, and the windings 33 are wound on the corresponding teeth portions 322.
Further, the distance from the circumferential outer edge of the air outlet 213 to the center of the circle is r, the outer edge radius of the tooth portion 322 is d1, and the outer edge radius of the annular portion 321 is d2, which satisfies the following dimensional relationship: the dimensions of (d1+d2)/2 < r < d1, r satisfy the above conditions so that r does not fail to secure a sufficient ventilation amount due to the dimensions being too small, nor does it affect the power consumption and efficiency of the external rotor motor 100 due to the dimensions being too large. Meanwhile, the end wall 212 is provided with a rib 214 between two adjacent air outlets 213, and the thickness of the rib 214 is L1, which satisfies the following dimensional relationship: the size of 3mm < L1< (d 1-d 2)/2, L1 meets the above conditions, so that L1 cannot cause insufficient flow area of the air outlet 213 due to too large size, thereby influencing motor temperature rise; the stress distribution around the air outlet 213 is not uniform due to the small size, thereby affecting the structural strength of the outer rotor 20.
As shown in fig. 4, the fan 40 is located at the axial front end of the end wall 212 and is provided with an annular base 41 fixed to the rotary shaft 10, a circular base plate 42 protruding radially outward from the axial front end of the base 41, and a plurality of blades 43 extending radially outward from the base 41 in a curved manner. The blades 43 are formed by protruding from the axial rear end surface of the base plate 42 in the axial direction, and the blades 43 are arranged in an arc shape. Meanwhile, the number of the air outlets 213 is set to n (n is greater than or equal to 3), and the number of the blades 43 is set to 2 (n+1); aiming at the electric tool, the forward rotation use working condition of the outer rotor motor 100 is relatively large, and the air gap flow between the stator and the rotor of the motor can be obviously increased on the basis of reducing the power consumption by matching the arc-shaped blades 43 with the air outlet 213 with a petal-shaped structure; the reverse rotation use condition of the outer rotor motor 100 occupies smaller space, and the temperature rise of the outer rotor motor 100 is less affected by adopting the arc-shaped blades 43. Thus, the present invention is not limited to application to unidirectional rotating electrical machines, and electric tools based on bidirectional rotating electrical machines are still applicable.
In the present invention, the rotor housing 21 is provided with air outlets 213 which are located on the end wall 212 and are uniformly distributed along the axial direction, the air outlets 213 are of an asymmetric petal-shaped structure, and the number of the air outlets 213 is an odd number. Under the same rotating speed, the air outlet 213 with the petal-shaped structure improves the air gap flow between the stator and the rotor of the motor, improves the temperature rise of the motor and prolongs the endurance time of the whole product.
The present invention is not limited to the above-described embodiments. Those of ordinary skill in the art will readily appreciate that many alternatives to the outer rotor motor of the present invention are possible without departing from the spirit and scope of the present invention. The protection scope of the present invention is subject to the claims.
Claims (8)
1. An outer rotor motor comprises a rotating shaft extending along the axial direction, an outer rotor fixed on the rotating shaft, a fan and an inner stator positioned between the rotating shaft and the outer rotor, wherein the outer rotor comprises a rotor shell covering the inner stator, the rotor shell is provided with an annular wall sleeved on the periphery of the inner stator and an end wall connected to the axial front end of the annular wall, and the end wall is adjacent to the fan and fixed on the rotating shaft; the method is characterized in that: the rotor shell is provided with air outlets which are positioned on the end wall and uniformly distributed along the axial direction, the air outlets are of an asymmetric petal-shaped structure, the number of the air outlets is odd and not less than 3, the inner stator comprises a stator bracket sleeved on the rotating shaft and a stator iron core fixedly arranged on the stator bracket, the stator iron core is provided with an annular part fixedly arranged on the stator bracket and a plurality of tooth parts protruding outwards from the annular part in the radial direction, the distance from the circumferential outer edge of the air outlets to the circle center is r, the outer edge radius of the tooth parts is d1, the outer edge radius of the annular part is d2, and the ratio of (d1+d2)/2 < r < d1; the end wall is provided with a rib part between two adjacent air outlets, wherein the thickness of the rib part is L1, and 3mm < L1< (d 1-d 2)/2.
2. The external rotor motor of claim 1, wherein: the number of the air outlets is 5.
3. The external rotor motor of claim 1, wherein: the inner stator comprises windings wound on the stator core, and the windings are wound on the corresponding tooth parts.
4. The external rotor motor of claim 1, wherein: the fan is located at the axial front end of the end wall and is provided with an annular base fixed on the rotating shaft and a plurality of blades extending from the base in a radial outward bending mode, and the blades are arranged in an arc shape.
5. The external rotor motor of claim 4, wherein: the fan is provided with a circular base plate which protrudes outwards from the axial front end of the base part along the radial direction, and the blades are formed by protruding backwards from the axial rear end surface of the base plate along the axial direction.
6. The external rotor motor of claim 4, wherein: the number of the air outlets is n, and the number of the blades is 2 (n+1).
7. The external rotor motor of claim 1, wherein: the outer rotor comprises a rotor bracket fixedly held on the inner wall surface of the annular wall and a plurality of magnetic steels attached to the inner wall surface of the annular wall, and the magnetic steels are fixed in the rotor shell through the rotor bracket.
8. The external rotor motor of claim 1, wherein: the outer rotor motor is a unidirectional rotating motor or a bidirectional rotating motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311016005.9A CN116799991B (en) | 2023-08-14 | 2023-08-14 | Outer rotor motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311016005.9A CN116799991B (en) | 2023-08-14 | 2023-08-14 | Outer rotor motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116799991A CN116799991A (en) | 2023-09-22 |
| CN116799991B true CN116799991B (en) | 2024-01-02 |
Family
ID=88050006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311016005.9A Active CN116799991B (en) | 2023-08-14 | 2023-08-14 | Outer rotor motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116799991B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393733A (en) * | 2014-12-03 | 2015-03-04 | 上海电动工具研究所 | Integral high-speed permanent-magnet brushless direct-current motor for electric tool |
| CN206164322U (en) * | 2016-11-10 | 2017-05-10 | 宁波金洪胜机电科技有限公司 | A external rotor electric machine for snowplow |
| CN115118046A (en) * | 2022-06-28 | 2022-09-27 | 江苏东成工具科技有限公司 | External rotor motor and fan thereof |
-
2023
- 2023-08-14 CN CN202311016005.9A patent/CN116799991B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393733A (en) * | 2014-12-03 | 2015-03-04 | 上海电动工具研究所 | Integral high-speed permanent-magnet brushless direct-current motor for electric tool |
| CN206164322U (en) * | 2016-11-10 | 2017-05-10 | 宁波金洪胜机电科技有限公司 | A external rotor electric machine for snowplow |
| CN115118046A (en) * | 2022-06-28 | 2022-09-27 | 江苏东成工具科技有限公司 | External rotor motor and fan thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116799991A (en) | 2023-09-22 |
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