CN204145121U - External rotor electric machine - Google Patents
External rotor electric machine Download PDFInfo
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- CN204145121U CN204145121U CN201420584364.4U CN201420584364U CN204145121U CN 204145121 U CN204145121 U CN 204145121U CN 201420584364 U CN201420584364 U CN 201420584364U CN 204145121 U CN204145121 U CN 204145121U
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Abstract
The utility model discloses a kind of external rotor electric machine, comprise: the rotor of stator and annular, be enclosed within outside rotor on stator, rotor comprises support sector and many group permanent-magnets group, many group permanent-magnets group is separately fixed on the internal perisporium of support sector, many group permanent-magnets group is arranged successively in the circumferential direction of rotor, every group permanent-magnet group comprises multiple permanent magnet distributed successively at the axial direction of rotor, on same periphery, the Magnetic Phase of the multiple permanent magnets in every group permanent-magnet group is same, the magnetic of the permanent magnet group of two adjacent groups is different, wherein in every group permanent-magnet group two permanent magnets of arbitrary neighborhood center to the center of rotor line between angle be skew angle, α > 0.According to external rotor electric machine of the present utility model, effectively can reduce the number of cycles of cogging torque amplitude and change cogging torque waveform, reduce vibration and the noise of external rotor electric machine.
Description
Technical field
The utility model relates to driving field, especially relates to a kind of external rotor electric machine.
Background technology
In the related, the cogging torque of external-rotor motor is large, thus the torque ripple caused by cogging torque increases thereupon, and then brings larger vibration & noise.
Utility model content
The utility model is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, an object of the present utility model is to propose a kind of external rotor electric machine, reduces the number of cycles of cogging torque amplitude and change cogging torque waveform.
According to external rotor electric machine of the present utility model, comprising: stator, the rotor of annular, be enclosed within outside described rotor on described stator, described rotor comprises support sector and many group permanent-magnets group, described many group permanent-magnets group is separately fixed on the internal perisporium of described support sector, described many group permanent-magnets group is arranged successively in the circumferential direction of described rotor, often organize described permanent magnet group and comprise multiple permanent magnet distributed successively at the axial direction of described rotor, on same periphery, the Magnetic Phase often organizing the described multiple permanent magnet in described permanent magnet group is same, the magnetic of the described permanent magnet group of two adjacent groups is different, the center wherein often organizing two permanent magnets of arbitrary neighborhood in described permanent magnet group to the center of described rotor line between angle be skew angle, α > 0.
According to external rotor electric machine of the present utility model, by being provided with many groups permanent magnet group spaced apart in the circumferential, every group permanent-magnet group comprises multiple permanent magnet axially distributing successively, and the phase place of the magnetic pole of two permanent magnets of arbitrary neighborhood in every group permanent-magnet group is in staggered distribution along the circumferencial direction of rotor with skew angle, thus effectively can reduce the number of cycles of cogging torque amplitude and change cogging torque waveform, reduce vibration and the noise of external rotor electric machine.
In addition, above-mentioned according to the utility model external rotor electric machine can also have following additional technical characteristic:
Preferably, the span of described skew angle is: 2 °≤α≤15 °.
According to embodiments more of the present utility model, often organize described permanent magnet group and comprise two described permanent magnets, the axial length often organizing described two permanent magnets of described permanent magnet group is identical, and the angle of deviation between described two permanent magnets of different group is equal.
According to other embodiments of the present utility model, often organize described permanent magnet group and comprise N number of described permanent magnet, described N is even number and described N is greater than 2, the axial length often organizing two described permanent magnets of the arbitrary neighborhood of described permanent magnet group is not identical, and all described skew angle in described many group permanent-magnets group is all equal.
According to some embodiments more of the present utility model, often organize described permanent magnet group and comprise N number of described permanent magnet, described N is odd number and described N is greater than 2, the axial length often organizing the N number of described permanent magnet of described permanent magnet group is identical, two the described permanent magnets often organizing the arbitrary neighborhood in described permanent magnet group partner, and the skew angle between the multipair described permanent magnet in described many group permanent-magnets group is not identical.
In embodiments more of the present utility model, often organize described permanent magnet group and comprise N number of described permanent magnet, described N < 7.
According to specific embodiments more of the present utility model, described support sector is formed as " U " shape substantially.
Alternatively, each described permanent magnet is pasted onto on the internal perisporium of described support sector by bonding agent.
In embodiments more of the present utility model, described stator is formed by stacking successively by the axis of multiple stator punching along described rotor.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the external rotor electric machine according to the utility model embodiment;
Fig. 2 is the schematic diagram of the external rotor electric machine according to another embodiment of the utility model;
Fig. 3 is the schematic diagram of the external rotor electric machine according to another embodiment of the utility model;
Fig. 4 is the end view of the external rotor electric machine according to the utility model embodiment;
Fig. 5 compares schematic diagram with the torque characteristics of the external rotor electric machine of correlation technique for the external rotor electric machine shown in Fig. 1, and wherein T1 is the cogging torque waveform of the external rotor electric machine of correlation technique, and T2 is the cogging torque waveform of the external rotor electric machine shown in Fig. 1;
Fig. 6 compares schematic diagram with the torque characteristics of the external rotor electric machine of correlation technique for the external rotor electric machine shown in Fig. 2, and wherein T1 is the cogging torque waveform of the external rotor electric machine of correlation technique, and T2 is the cogging torque waveform of the external rotor electric machine shown in Fig. 2;
Fig. 7 compares schematic diagram with the torque characteristics of the external rotor electric machine of correlation technique for the external rotor electric machine shown in Fig. 3, and wherein T1 is the cogging torque waveform of the external rotor electric machine of correlation technique, and T2 is the cogging torque waveform of the external rotor electric machine shown in Fig. 3.
Reference numeral:
External rotor electric machine 100,
Stator 1, teeth groove 10,
Rotor 2, support sector 20, permanent magnet group 21, permanent magnet 210,
First line 3, second connects 4.
Embodiment
Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.
In description of the present utility model, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In description of the present utility model, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.
In the utility model, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements.For the ordinary skill in the art, the concrete meaning of above-mentioned term in the utility model can be understood as the case may be.
The external rotor electric machine 100 according to the utility model embodiment is described in detail below with reference to Fig. 1-Fig. 7.
As Figure 1-Figure 4, according to the external rotor electric machine 100 of the utility model embodiment, comprising: the rotor 2 of stator 1 and annular, wherein, stator 1 is provided with multiple teeth groove 10 for winding around winding.Cogging torque is interacted by the teeth groove 10 of the magnetic field of the permanent magnet 210 of rotor 2 with stator 1, in the torque that circumferencial direction produces.
On the stator 1, rotor 2 comprises support sector 20 and many group permanent-magnets group 21 to rotor 2 overcoat, it should be noted that, the material of support sector 20 is permeability magnetic material, and wherein support sector 20 adopts the object of permeability magnetic material to be for the magnetic field of motor provides loop.Particularly, support sector 20 can be made of one piece, stacked etc.In the example of Fig. 1-Fig. 3 of the present utility model, support sector 20 is formed as " U " shape substantially.
Many group permanent-magnets group 21 is separately fixed on the internal perisporium of support sector 20, in other words, many group permanent-magnets group 21 is positioned on the periphery wall of stator 1, in the direction from the center of external rotor electric machine 100 to the periphery wall of external rotor electric machine 100, be placed with rotor 2, permanent magnet group 21 and support sector 20 successively.
Many group permanent-magnets group 21 is arranged successively in the circumferential direction of rotor 2, every group permanent-magnet group 21 comprises multiple permanent magnet 210 distributed successively at the axial direction of rotor 2, that is, every group permanent-magnet group 21 is divided into multistage on the axial direction of rotor 2, be understandable that, the number of the permanent magnet 210 in the permanent magnet group 21 of different group should be identical.In concrete example of the present utility model, in order to reduce the difficulty of processing of rotor 2, every group permanent-magnet group 21 comprises N number of permanent magnet 210, N < 7.
On same periphery, the Magnetic Phase of the multiple permanent magnets 210 in every group permanent-magnet group 21 is same, the magnetic of the permanent magnet group 21 of two adjacent groups is different, wherein in every group permanent-magnet group 21 two permanent magnets 210 of arbitrary neighborhood center to the center of rotor 2 line between angle be skew angle, α > 0, that is, the center of one of them permanent magnet 210 in two permanent magnets 210 of the arbitrary neighborhood in every group permanent-magnet group 21 is to the line at the center of rotor 2, and the center of another one permanent magnet 210 to the center of rotor 2 line between there is skew angle.In other words, the phase place of the magnetic pole of two permanent magnets 210 at the same level that the axis in every group permanent-magnet group 21 is adjacent is in staggered distribution along the circumferencial direction of rotor 2 on the internal perisporium of support sector 20 with skew angle.
Two permanent magnets 210 of the arbitrary neighborhood in every group permanent-magnet group 21 in a pair, therefore every group permanent-magnet group 21 comprises at least one pair of permanent magnet 210, the line at the center of one of them permanent magnet 210 in often pair of permanent magnet 210 and the center of rotor 2 is the first line 3, the line at the center of another permanent magnet 210 and the center of rotor 2 is the second line 4, between first line 3 and the second line 4, there is angle, this angle is skew angle, in other words, between often pair of permanent magnet 210, there is skew angle.
Be understandable that, the skew angle of the multipair permanent magnet 210 in many group permanent-magnets group 21 can be the same or different.The number of cycles of the amplitude that the size that wherein size of the skew angle of often pair of permanent magnet 210 affects cogging torque reduces and cogging torque waveform.In preferred exemplary of the present utility model, the span of skew angle is: 2 °≤α≤15 °, thus ensures the maximum of cogging torque to be reduced to minimum and to make the number of cycles of the waveform of cogging torque be in optimum number.
According to the external rotor electric machine 100 of the utility model embodiment, by being provided with many groups permanent magnet group 21 spaced apart in the circumferential, every group permanent-magnet group 21 comprises multiple permanent magnet 210 axially distributing successively, and the phase place of the magnetic pole of two permanent magnets 210 of arbitrary neighborhood in every group permanent-magnet group 21 is in staggered distribution along the circumferencial direction of rotor 2 with skew angle, thus effectively can reduce the number of cycles of cogging torque amplitude and change cogging torque waveform, reduce vibration and the noise of external rotor electric machine 100.
In concrete examples more of the present utility model, when every group permanent-magnet group 21 comprises two permanent magnets 210 and the skew angle of two permanent magnets 210 is 10 °, the maximum of cogging torque of external rotor electric machine 100 of the present utility model reduces 63% compared with the maximum of the cogging torque of the external rotor electric machine of correlation technique, and the number of cycles of cogging torque waveform increases.
The rotor 2 according to the utility model three specific embodiments is described in detail below with reference to Fig. 1-Fig. 7.
Embodiment 1:
In this embodiment, as shown in Figure 1, every group permanent-magnet group 21 comprises two permanent magnets 210, and the axial length of two permanent magnets 210 of every group permanent-magnet group 21 is identical, and the angle of deviation between two permanent magnets 210 of different group is equal.In other words, every group permanent-magnet group 21 is 2 sections along the hop count of the axial segmentation of rotor 2, and deflection made by two permanent magnets 210 in every group permanent-magnet group 21 axial length such as along the circumferential direction, and the skew angle of multipair permanent magnet 210 is equal.
As shown in Figure 5, adopt the external rotor electric machine 100 of the rotor 2 of this embodiment compared with the external rotor electric machine 100 in correlation technique, adopt the size of the cogging torque of the external rotor electric machine 100 of the rotor 2 of this embodiment significantly to reduce and the number of cycles of cogging torque waveform increases.
Embodiment 2:
As shown in Figure 2, in this embodiment, every group permanent-magnet group 21 comprises three permanent magnets 210, the axial length of three permanent magnets 210 of every group permanent-magnet group 21 is identical, two permanent magnet groups 21 of the arbitrary neighborhood in every group permanent-magnet group 21 in a pair, namely every group permanent-magnet group 21 comprises two pairs of permanent magnets 210, skew angle between two pairs of permanent magnets 210 in every group permanent-magnet group 21 is not identical, and skew angle between any two pairs of permanent magnets 210 in the permanent magnet group 21 of different group is not identical, in brief, skew angle between multipair permanent magnet 210 in many group permanent-magnets group 21 is not identical.
In other words, every group permanent-magnet group 21 is 3 along the hop count of the axial segmentation of rotor 2, two permanent magnets 210 of the arbitrary neighborhood in every group permanent-magnet group 21 along the circumferential direction etc. make deflection to axial length, and the skew angle of any two pairs of permanent magnets 210 is not identical.
As shown in Figure 6, adopt the external rotor electric machine 100 of the rotor 2 of this embodiment compared with the external rotor electric machine 100 in correlation technique, adopt the size of the cogging torque of the external rotor electric machine 100 of the rotor 2 of this embodiment significantly to reduce and the number of cycles of cogging torque waveform does not change.
Be understandable that, in this embodiment, under the prerequisite that the size of cogging torque significantly reduces and the number of cycles of cogging torque waveform does not change, the number of the permanent magnet 210 of every group permanent-magnet group 21 can be not limited to three, such as can also be 5, 7 are waited odd number, in other words, every group permanent-magnet group 21 comprises N number of permanent magnet 210, N is odd number and N is greater than 2, the axial length of N number of permanent magnet 210 of every group permanent-magnet group 21 is identical, two permanent magnets 210 of the arbitrary neighborhood in every group permanent-magnet group 21 in a pair, skew angle between multipair permanent magnet 210 in many group permanent-magnets group 21 is not identical.
Embodiment 3:
As shown in Figure 3, in this embodiment, every group permanent-magnet group 21 comprises four permanent magnets 210, two permanent magnet groups 21 of the arbitrary neighborhood in every group permanent-magnet group 21 in a pair, namely each permanent magnet group 21 comprises three pairs of permanent magnets 210, the axial length of two permanent magnets 210 of the arbitrary neighborhood in every group permanent-magnet group 21 is not identical, all skew angle in many group permanent-magnets group 21 are all equal, and all skew angle are all equal to be referred to: the skew angle of any two pairs of permanent magnets 210 in many group permanent-magnets group 21 is all equal.
In other words, every group permanent-magnet group 21 is four along the hop count of the axial segmentation of rotor 2, two permanent magnets 210 of the arbitrary neighborhood in every group permanent-magnet group 21 along the circumferential direction axial length make deflection unevenly, and the skew angle of axially adjacent two couples permanent magnet at the same level 210 is identical, the skew angle of any two pairs of permanent magnets 210 is all identical.
As shown in Figure 7, adopt the external rotor electric machine 100 of the rotor 2 of this embodiment compared with the external rotor electric machine 100 in correlation technique, adopt the size of the cogging torque of the external rotor electric machine 100 of the rotor 2 of this embodiment significantly to reduce and the minimizing of the number of cycles of cogging torque waveform.
Be understandable that, in this embodiment, in the prerequisite that the size of cogging torque significantly reduces and the number of cycles of cogging torque waveform reduces, the number of the permanent magnet 210 of every group permanent-magnet group 21 can be not limited to three, can also be such as the even numbers such as 6,8, in other words, every group permanent-magnet group 21 comprises N number of permanent magnet 210, N is even number and N is greater than 2, the axial length of two permanent magnets 210 of the arbitrary neighborhood of every group permanent-magnet group 21 is not identical, and all skew angle in many group permanent-magnets group 21 are all equal.
In specific embodiment of the utility model, each permanent magnet 210 is pasted onto by bonding agent on the internal perisporium of support sector 20, in order to ensure enough glue-joint strengths, must provide the bond layer of certain thickness.Thus ensure that permanent magnet 210 can not transfer produce skew or drop because of the high-speed rotary of rotor 2, improve the reliability of external rotor electric machine 100.In concrete example of the present utility model, the glue of high strength can be adopted to carry out gluing permanent magnet 210, and decide glue-joint strength requirement according to the shape and size of rotor 2 and material used.Be understandable that, each permanent magnet 210 can also adopt other fixed forms to be fixed on the internal perisporium of support sector 20, such as, adopt jump ring.
According to specific embodiment of the utility model, stator 1 is formed by stacking successively by the axis of multiple stator punching along rotor 2, and that is, stator 1 adopts same stator punching to form, and stator punching axially lamination reaches required height.Particularly, each stator punching can be silicon steel sheet.In concrete example of the present utility model, each stator punching is thickness is 0.35mm or 0.5mm or other thinner silicon steel sheets, reduces the iron loss of motor.
In the utility model, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present utility model or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and described embodiment of the present utility model above, be understandable that, above-described embodiment is exemplary, can not be interpreted as restriction of the present utility model, those of ordinary skill in the art can change above-described embodiment, revises, replace and modification in scope of the present utility model.
Claims (9)
1. an external rotor electric machine, is characterized in that, comprising:
Stator;
The rotor of annular, be enclosed within outside described rotor on described stator, described rotor comprises support sector and many group permanent-magnets group, described many group permanent-magnets group is separately fixed on the internal perisporium of described support sector, described many group permanent-magnets group is arranged successively in the circumferential direction of described rotor, often organize described permanent magnet group and comprise multiple permanent magnet distributed successively at the axial direction of described rotor, on same periphery, the Magnetic Phase often organizing the described multiple permanent magnet in described permanent magnet group is same, the magnetic of the described permanent magnet group of two adjacent groups is different, the center wherein often organizing two permanent magnets of arbitrary neighborhood in described permanent magnet group to the center of described rotor line between angle be skew angle, α > 0.
2. external rotor electric machine according to claim 1, is characterized in that, the span of described skew angle is: 2 °≤α≤15 °.
3. external rotor electric machine according to claim 1, it is characterized in that, often organize described permanent magnet group and comprise two described permanent magnets, the axial length often organizing described two permanent magnets of described permanent magnet group is identical, and the angle of deviation between described two permanent magnets of different group is equal.
4. external rotor electric machine according to claim 1, it is characterized in that, often organize described permanent magnet group and comprise N number of described permanent magnet, described N is even number and described N is greater than 2, the axial length often organizing two described permanent magnets of the arbitrary neighborhood of described permanent magnet group is not identical, and all described skew angle in described many group permanent-magnets group is all equal.
5. external rotor electric machine according to claim 1, it is characterized in that, often organize described permanent magnet group and comprise N number of described permanent magnet, described N is odd number and described N is greater than 2, the axial length often organizing the N number of described permanent magnet of described permanent magnet group is identical, two the described permanent magnets often organizing the arbitrary neighborhood in described permanent magnet group partner, and the skew angle between the multipair described permanent magnet in described many group permanent-magnets group is not identical.
6. the external rotor electric machine according to any one of claim 1-2,4-5, is characterized in that, often organizes described permanent magnet group and comprises N number of described permanent magnet, described N < 7.
7. external rotor electric machine according to claim 1, is characterized in that, described support sector is formed as " U " shape substantially.
8. external rotor electric machine according to claim 1, is characterized in that, each described permanent magnet is pasted onto on the internal perisporium of described support sector by bonding agent.
9. external rotor electric machine according to claim 1, is characterized in that, described stator is formed by stacking successively by the axis of multiple stator punching along described rotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420584364.4U CN204145121U (en) | 2014-10-10 | 2014-10-10 | External rotor electric machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420584364.4U CN204145121U (en) | 2014-10-10 | 2014-10-10 | External rotor electric machine |
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| Publication Number | Publication Date |
|---|---|
| CN204145121U true CN204145121U (en) | 2015-02-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420584364.4U Active CN204145121U (en) | 2014-10-10 | 2014-10-10 | External rotor electric machine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160286A (en) * | 2016-07-13 | 2016-11-23 | 广东威灵电机制造有限公司 | Magneto |
| CN107787547A (en) * | 2015-06-30 | 2018-03-09 | 罗伯特·博世有限公司 | The motor of slot effect and torque ripple with reduction |
| CN109617275A (en) * | 2018-12-15 | 2019-04-12 | 宁波中大力德智能传动股份有限公司 | A kind of brshless DC motor |
-
2014
- 2014-10-10 CN CN201420584364.4U patent/CN204145121U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107787547A (en) * | 2015-06-30 | 2018-03-09 | 罗伯特·博世有限公司 | The motor of slot effect and torque ripple with reduction |
| US10530208B2 (en) | 2015-06-30 | 2020-01-07 | Robert Bosch Gmbh | Electrical machine with reduced cogging and torque ripple |
| CN106160286A (en) * | 2016-07-13 | 2016-11-23 | 广东威灵电机制造有限公司 | Magneto |
| CN106160286B (en) * | 2016-07-13 | 2018-07-24 | 广东威灵电机制造有限公司 | Magneto |
| CN109617275A (en) * | 2018-12-15 | 2019-04-12 | 宁波中大力德智能传动股份有限公司 | A kind of brshless DC motor |
| CN109617275B (en) * | 2018-12-15 | 2020-08-11 | 宁波中大力德智能传动股份有限公司 | Brushless DC motor |
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