CN102983647A - External rotor electric machine - Google Patents
External rotor electric machine Download PDFInfo
- Publication number
- CN102983647A CN102983647A CN2012104550552A CN201210455055A CN102983647A CN 102983647 A CN102983647 A CN 102983647A CN 2012104550552 A CN2012104550552 A CN 2012104550552A CN 201210455055 A CN201210455055 A CN 201210455055A CN 102983647 A CN102983647 A CN 102983647A
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- Prior art keywords
- external rotor
- electric machine
- rotor
- end cap
- boss portion
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Abstract
The invention relates to an external rotor electric machine which comprises an internal stator, an external rotor matched with the internal stator, and an electric machine end cover covered on the upper portion of the external rotor. The inner wall of the external rotor is provided with conical degree, and the width of an opening of the external rotor is greater than that of an opening of the bottom of the external rotor. According to the external rotor electric machine, the inner wall of the external rotor is machined to be provided with a certain conical degree, the inner diameter of the opening is slightly greater than that of the root, air gap is small where deformation quantity of a rotating shaft is small, the air gap is adequately increased where the deformation quantity of the rotating shaft is large, friction generated between the stator and the rotor is ensued not to happen when the electric machine operates, and combination properties of the electric machine are promoted. An interval between a pressing shaft tool and the inner wall of the rotor can also be reduced, and concentricity of a rotor shaft and the inner wall of the rotor is improved.
Description
Technical field
The present invention relates to a kind of external rotor electric machine.
Background technology
At present, external rotor electric machine mainly is comprised of internal stator assembly, outer rotor component, and stator comprises end cap, stator core and coil windings etc., and coil windings is on stator core; Rotor assembly mainly is comprised of rotor core, cast aluminium sliver, cast aluminium end ring, axle sleeve, motor shaft etc.Rotor is by rotating shaft and two bearing fits that are installed on the stator.This external rotor electric machine rotating shaft only has an end to fix with rotor, belongs to typical overhanging beam structure, does not rub in order to guarantee rotor inwall and stator outer wall, has to add air gaps, has reduced the electromagnetic performance of motor, and electric efficiency is generally not high; Secondly, rotating shaft and rotor axle sleeve are interference fit, and armature spindle and rotor inner wall concentricity are difficult to guarantee; In addition, the structures shape of this motor it can not accomplish to seal fully, the motor water resistance is generally bad.
Summary of the invention
The purpose of this invention is to provide a kind of external rotor electric machine.
For achieving the above object, the technical solution used in the present invention is:
A kind of external rotor electric machine, it comprises internal stator, the external rotor that matches with described internal stator, the electric motor end cap that covers described external rotor top, the inwall of described external rotor has tapering, and the width of described external rotor oral area is greater than the width of bottom.
Preferably, described external rotor bottom is provided with pit, the internal face of described external rotor bottom consists of the outside wall surface of described pit, offers several delivery ports on the outside wall surface of described pit, and the water outlet direction of described delivery port is radially consistent with described external rotor.
Further preferably, the porch of the bottom of described external rotor, delivery port is provided with block.
Further preferably, the internal face of described pit extends upward and forms described block.
Preferably, the top of described external rotor is provided with the cast aluminium flange.
Preferably, the end face of described motor side tegmental wall has concave part, and the corresponding position of described external rotor and described electric motor end cap concave part has boss portion, and described electric motor end cap, external rotor match by described concave part, boss portion.
Further preferably, the boss portion inboard of described external rotor is provided with water-blocking groove, the inner peripheral surface of described boss portion consists of the outside wall surface of described water-blocking groove, when the concave part of described electric motor end cap with after the boss portion of described external rotor matches, the inner peripheral surface of the concave part of described electric motor end cap and the outside wall surface of described water-blocking groove have the gap.
Because technique scheme is used, the present invention compared with prior art has following advantages:
The present invention is processed into the external rotor inwall with certain taper, make the oral area internal diameter more bigger than root internal diameter, the local air gap that the rotating shaft deflection is little is less, the local air gap that the rotating shaft deflection is large suitably strengthens, can not rub between stator and the rotor when having guaranteed the motor operation, electric machine combination property gets a promotion; Can also reduce the gap of last item frock and rotor inner wall, improve the concentricity of armature spindle and rotor inner wall.
Description of drawings
Accompanying drawing 1 is stereogram of the present invention;
Accompanying drawing 4 is the cross-sectional schematic of external rotor among the present invention;
Accompanying drawing 5 is B section enlarged drawing in the accompanying drawing 4.
Wherein: 1, internal stator; 2, external rotor; 20, boss portion; 21, water-blocking groove; 22, gap; 3, electric motor end cap; 30, concave part; 4, pit; 5, delivery port; 6, cast aluminium flange; 7, block.
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
A kind of external rotor electric machine as shown in Figure 1, 2, it comprises internal stator 1, the external rotor 2 that matches with internal stator 1, covers the electric motor end cap 3 on external rotor 2 tops, the end face of electric motor end cap 3 walls has concave part 30, external rotor 2 has boss portion 20 with concave part 30 cooperation places of electric motor end cap 3, when external rotor 2 cooperated with electric motor end cap 3, boss portion 20 was inserted in the concave part 30.
Shown in Fig. 3,4, also be specially provided with waterproof construction on the external rotor 2, this waterproof construction comprises the water-blocking groove 21 that the inboard of the boss portion 20 of external rotor 2 arranges, the inner peripheral surface of boss portion 20 consists of the outside wall surface of water-blocking groove 21, in the present embodiment, it is U-shaped that water-blocking groove is, when the concave part 30 of electric motor end cap 3 with after the boss portion 20 of external rotor 2 matches, the inner peripheral surface of the concave part 30 of electric motor end cap 3 and the outside wall surface of water-blocking groove 21 have gap 22, make between electric motor end cap 3 and the external rotor 2 to consist of clearance seal, reach the effect of waterproof.
The inwall of external rotor 2 has tapering, and the width of external rotor 2 oral areas is greater than the width of bottom, like this be arranged so that the little local air gap of rotating shaft deflection is less, the local air gap that the rotating shaft deflection is large suitably strengthens, can not rub between stator and the rotor when having guaranteed the motor operation, electric machine combination property gets a promotion; And can reduce the gap of last item frock and external rotor 2 inwalls, improve the concentricity of armature spindle and external rotor 2 inwalls.
In addition, the porch of the bottom of external rotor 2, delivery port 5 is provided with block 7, and in the present embodiment, the internal face of pit 4 extends upward and forms this block 7, and block 7 can prevent effectively that the foreign object accident from entering motor internal, can protect well the stator coil winding.
At last, also be provided with cast aluminium flange 7 on the top of external rotor 2, convenient various installations.
Above-described embodiment only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the personage who is familiar with technique can understand content of the present invention and according to this enforcement, can not limit protection scope of the present invention with this.All equivalences that Spirit Essence is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (7)
1. external rotor electric machine, it comprises internal stator, the external rotor that matches with described internal stator, the electric motor end cap that covers described external rotor top, it is characterized in that: the inwall of described external rotor has tapering, and the width of described external rotor oral area is greater than the width of bottom.
2. a kind of external rotor electric machine according to claim 1, it is characterized in that: described external rotor bottom is provided with pit, the internal face of described external rotor bottom consists of the outside wall surface of described pit, offer several delivery ports on the outside wall surface of described pit, the water outlet direction of described delivery port is radially consistent with described external rotor.
3. a kind of external rotor electric machine according to claim 2, it is characterized in that: the bottom of described external rotor, the porch of delivery port are provided with block.
4. a kind of external rotor electric machine according to claim 3 is characterized in that: the internal face of described pit extends upward and forms described block.
5. a kind of external rotor electric machine according to claim 1, it is characterized in that: the top of described external rotor is provided with the cast aluminium flange.
6. a kind of external rotor electric machine according to claim 1, it is characterized in that: the end face of described motor side tegmental wall has concave part, the corresponding position of described external rotor and described electric motor end cap concave part has boss portion, and described electric motor end cap, external rotor match by described concave part, boss portion.
7. a kind of external rotor electric machine according to claim 6, it is characterized in that: the boss portion inboard of described external rotor is provided with water-blocking groove, the inner peripheral surface of described boss portion consists of the outside wall surface of described water-blocking groove, when the concave part of described electric motor end cap with after the boss portion of described external rotor matches, the inner peripheral surface of the concave part of described electric motor end cap and the outside wall surface of described water-blocking groove have the gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104550552A CN102983647A (en) | 2012-11-14 | 2012-11-14 | External rotor electric machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104550552A CN102983647A (en) | 2012-11-14 | 2012-11-14 | External rotor electric machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102983647A true CN102983647A (en) | 2013-03-20 |
Family
ID=47857456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104550552A Pending CN102983647A (en) | 2012-11-14 | 2012-11-14 | External rotor electric machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102983647A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110896649A (en) * | 2018-05-31 | 2020-03-20 | 深圳市大疆创新科技有限公司 | Cloud platform |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09261923A (en) * | 1996-03-25 | 1997-10-03 | Toshiba Corp | Rotating electric machine |
| CN101420146A (en) * | 2008-11-13 | 2009-04-29 | 杭州顿力长三角高新技术成果转化中心有限公司 | Outer rotor waterproof motor and waterproof method |
| CN201789359U (en) * | 2010-09-14 | 2011-04-06 | 中山大洋电机制造有限公司 | External rotor electric machine with waterproof structure |
-
2012
- 2012-11-14 CN CN2012104550552A patent/CN102983647A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09261923A (en) * | 1996-03-25 | 1997-10-03 | Toshiba Corp | Rotating electric machine |
| CN101420146A (en) * | 2008-11-13 | 2009-04-29 | 杭州顿力长三角高新技术成果转化中心有限公司 | Outer rotor waterproof motor and waterproof method |
| CN201789359U (en) * | 2010-09-14 | 2011-04-06 | 中山大洋电机制造有限公司 | External rotor electric machine with waterproof structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110896649A (en) * | 2018-05-31 | 2020-03-20 | 深圳市大疆创新科技有限公司 | Cloud platform |
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Application publication date: 20130320 |