CN104505966A - Outer rotor brushless motor - Google Patents
Outer rotor brushless motor Download PDFInfo
- Publication number
- CN104505966A CN104505966A CN201410849816.1A CN201410849816A CN104505966A CN 104505966 A CN104505966 A CN 104505966A CN 201410849816 A CN201410849816 A CN 201410849816A CN 104505966 A CN104505966 A CN 104505966A
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- China
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- brushless motor
- magnetic pole
- rotor brushless
- stator
- bonnet
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Abstract
The invention is applicable to the technical field of motor structures, and discloses an outer rotor brushless motor. The outer rotor brushless motor comprises a stator assembly and a rotor assembly; the stator assembly comprises a rear cover, stator windings and a stator core; the center of the rear cover is outwardly provided with a hollow cylindrical boss; the stator core is vertically fixed on the outer side wall of the boss, and provided with a plurality of winding slots; each winding slot is winded with a stator winding; the rotor assembly comprises a front cover, a rotary shaft and a shell; the inner side wall of the shell is provided with a plurality of eodymium-iron-boron magnetic poles according to the number of the winding slots and the multiple of increasing the least common multiple; the center of the front cover is provide with a through hole; one end of the rotary shaft is fixedly connected into the through hole, and the other end of the rotary shaft extends out of the rear cover through a hollow passage of the boss; and the shell is fixedly connected to the front cover and covers the periphery of the stator core. The outer rotor brushless motor is small in size, large in torque, small in cogging torque, and high in sensitivity, and the quality of photos is improved.
Description
Technical field
The invention belongs to electric machine structure technical field, particularly relate to a kind of external rotor brushless motor.
Background technology
Permanent magnetic brushless has high energy conversion efficiency, excellent dynamic and static governor control characteristics, higher reaction sensitivity, and structure simple, reliable, be easy to the advantages such as control, make it apply from war industry, develop rapidly to Aero-Space, medical treatment, information, household electrical appliances and industrial automation.
Under the background that the living condition of people improves constantly, take pictures, photography etc. has been deep into each family, also more and more harsh to the quality requirement of shooting.In existing picture pick-up device, all can use brushless electric machine, thus, the performances such as the sensitivity of brushless electric machine reaction, the stationarity of rotation and efficiency, all affect the quality of photograph taking.And existing brushless electric machine exists that volume is comparatively large, efficiency is low, moment compared with the defect such as little, cogging torque is large, sensitivity is low, cause the of low quality of photograph taking.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of external rotor brushless motor, its volume is little, efficiency is high, moment is large, cogging torque is little, highly sensitive, improve the quality of photograph taking.
Technical scheme of the present invention is: a kind of external rotor brushless motor, comprise stator module and rotor assembly, described stator module comprises bonnet, stator winding and stator core, one end, center of described bonnet is to the cylindrical boss being outside equipped with hollow, described stator core is vertically fixed on the lateral wall of described boss, described stator core has multiple winding slot, in each described winding slot, is all wound with described stator winding; Described rotor assembly comprises protecgulum, rotating shaft and casing, the madial wall of described casing is provided with multiple ndfeb magnetic pole according to by increasing with the relation of its least common multiple according to the number of winding slot, described protecgulum center offers the through hole for installing described rotating shaft, one end of described rotating shaft is fixedly connected in described through hole, the other end passes described bonnet via the hollow channel extension of described boss, described casing is fixedly connected on described protecgulum, and is located at the periphery of described stator core.
Particularly, the equidistant circumference array of each described magnetic pole on the madial wall of described casing, and and between described stator core, there is running clearance, the polarity described in adjacent two between magnetic pole is contrary.
Particularly, described protecgulum is provided with the separation trough for installing fixing described magnetic pole, one end of described magnetic pole is inserted in described separation trough.
Particularly, described winding slot number is 12, and the number of described magnetic pole is 14.
Particularly, the width of described winding slot opening is 0.5 ~ 2mm.
Preferably, the width of described winding slot opening is 1.5mm.
Particularly, described spindle central and described bonnet central coaxial are arranged, and are rotationally connected by bearing and described bonnet, described bonnet offer the installing hole for installing fixing described bearing.
Further, described bonnet also offers the fixing hole for installing fixed electrical machinery.
A kind of external rotor brushless motor provided by the invention, by the one end, center at bonnet outwards to the cylindrical boss being outside equipped with hollow, and stator core is vertically fixedly mounted on the lateral wall of boss, simultaneously, the chassis cover be fixedly connected with protecgulum is located at the periphery of stator core, and the rotating shaft being arranged on protecgulum center is extended via the hollow channel of boss the outside passed to bonnet.In addition, according to the number of winding slot, by increasing the relation with its least common multiple, the multiple ndfeb magnetic pole of relative set on the madial wall of casing.By such setting, the compact conformation of motor, volume is little, and adopt the ndfeb magnetic pole of high energy product, and use the composition of relations of magnetic pole and winding slot number, increase the periodicity that least common multiple counting method increases cogging torque, reduce the amplitude of cogging torque, electric machine rotation is steady, controls highly sensitive.
Accompanying drawing explanation
Fig. 1 is the generalized section of the external rotor brushless motor that the embodiment of the present invention provides;
Fig. 2 is another generalized section of the external rotor brushless motor that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
A kind of external rotor brushless motor that the embodiment of the present invention provides, rotating speed is the external rotor permanent magnet brushless motor of (20 ~ 30 rpms).Comprise stator module (not indicating in figure) and rotor assembly (not indicating in figure).Because the motor in the present embodiment is external rotor electric machine, thus the rotor assembly of motor is arranged on the outside of stator module, and can rotate by relative stator assembly.
Particularly, as depicted in figs. 1 and 2, stator module comprises bonnet 11, stator winding 12 and stator core 13, the axle center place of bonnet 11 is provided with and the cylindrical boss 112 of hollow coaxial with it, stator core 13 is vertically fixed on the lateral wall of boss 112, stator core 13 has multiple winding slot 131, in each winding slot 131, be all wound with stator winding 12, rotor assembly comprises protecgulum 21, rotating shaft 22 and casing 24, according to the number of winding slot 131 and according to the relation by increase and its least common multiple on the madial wall of casing 24, and be provided with multiple ndfeb magnetic pole 23, the axle center place of protecgulum 21 offers the through hole 211 for installing rotating shaft 22, one end of rotating shaft 22 is fixedly connected in through hole 211, and be connected and fixed by screw class securing member (not indicating in figure), to ensure the reliability that rotatory force is transmitted, the other end of rotating shaft 22 extends via the center of circle of boss 112 and passes bonnet 11, power is transmitted for being connected with external equipment.Casing 24 is fixedly connected on protecgulum 21, and be located at the periphery of stator core 13, thus the magnetic pole 23 be arranged on casing 24 madial wall can be interacted with the stator winding 12 be wrapped on stator core 13, by the rotary driving force of magnetic field generation between the two, rotor assembly is rotated.And casing 24 is located at the periphery of stator core 13, also serve the function of protection stator core 13.
Particularly, as depicted in figs. 1 and 2, in the present embodiment, vertically be fixedly mounted on by stator core 13 on the lateral wall of boss 112, the casing 24 be simultaneously fixedly connected with protecgulum 21 is located at the periphery of stator core 13, and the rotating shaft 22 being arranged on protecgulum 21 axle center place is extended via the center of circle of boss 112 outside passed to bonnet 11, so that the output of power, and by such setting, improve the compactedness of whole electric motor structure, thus decrease the volume of motor.And the ndfeb magnetic pole 23 of setting is permanent magnet, can produce stable magnetic field, thus the magnetic field changed after stator winding 12 is energized, both interact, and enable rotor assembly smooth rotation, efficiency is high, and the moment of rotating generation is large.
Particularly, as depicted in figs. 1 and 2, the equidistant circumference array of each magnetic pole 23 on the madial wall of casing 24, and and has running clearance between stator core 13, can freely rotate.Each magnetic pole 23 is fixed on the madial wall of casing 24 by anaerobic adhesive, not easily loosens, good stability.And the polarity between adjacent two magnetic poles 23 is contrary, thus can according to design needs, the magnetic field changed, for the magnetic field interaction produced with stator winding 12, realizes driving rotor assembly rotation.
Particularly, as depicted in figs. 1 and 2, casing 24 is connected to one by the mounting means of interference fit and protecgulum 21, and when rotating, the magnetic pole 23 be fixed on casing 24 madial wall is followed casing 24 and is rotated together, for ensureing that each magnetic pole 23 is arranged on the stability on casing 24 madial wall, just on protecgulum 21, be provided with the separation trough (not shown) for installing fixed magnetic pole 23, one end of magnetic pole 23 is inserted in separation trough, thus by the further fixed magnetic pole 23 of separation trough, ensure that the stability that magnetic pole 23 is installed.
Particularly, as depicted in figs. 1 and 2, in order to reach the steady reliability service of motor, the apolegamy of magnetic pole 23 logarithm and winding slot 131 number is extremely important.When the ratio of number of poles and groove number equals integer, be integer groove winding; Equal mark, be fractional slot winding.If adopt integer groove winding in outer rotor motor, the magnetic pole 23 often producing the tooth of stator and rotor is attracting and produce similar and " the aliging in tooth pole " of stepping motor phenomenon, the namely pulsation that causes of slot effect, produces harmful effect to motor running.Therefore preference score groove concentratred winding in the present invention, the pass of the number of the winding slot 131 on the number of magnetic pole 23 of rotor and stator core 13 is adopted to be: winding slot 131 is 12, magnetic pole 23 number is 14, thus make the least common multiple of the number of magnetic pole 23 and the number of winding slot 131 be 84, magnetic pole 23 number and the several relation of winding slot 131 and the periodicity of cogging torque that produces is 84 thus, and pass through the periodicity of preferably large cogging torque, to reduce the amplitude of cogging torque, to ensure the stationarity of electric machine rotation.
Preferably, as depicted in figs. 1 and 2, in actual production, when ensureing coiling, preferably relatively small-rabbet width, for reduction cogging torque.According to designing requirement, be generally 0.5 ~ 2mm.In the present embodiment, the width of winding slot 131 opening is set to 1.5mm.Certainly, understandably, according to different designing requirements, the width of winding slot 131 opening can also be arranged to different width, is not limited only to the width that the present embodiment is arranged, does not limit at this.
Particularly, as depicted in figs. 1 and 2, rotating shaft 22 center and bonnet 11 central coaxial are arranged, and are rotationally connected by bearing 14 and bonnet 11, bonnet 11 offers the installing hole (not indicating in figure) for installing rigid bearing 14, and mounting hole site is in the side of boss 112.In the present embodiment, bearing 14 is ball bearing, and is provided with two, lay respectively at the both sides of boss 112, one of them is arranged in installing hole, and another abuts with the top of boss 112 and arranges, rotating shaft 22 is located in dead eye, by the support of bearing 14, guarantees the stationarity of rotating.
Further, as depicted in figs. 1 and 2, for convenience of the installation of motor, bonnet 11 also offers the fixing hole 111 for installing fixed electrical machinery.Fixing hole 111 is screwed hole, thus by adopting bolt class securing member and fixing hole 111 to assemble, is fixed on installation position by whole motor, installs fixing quick and easy.In addition, bonnet 11 is hollow structure, and all component except protecgulum 21 all surrounds therein by it, improves integrally-built compactedness.
A kind of external rotor brushless motor that the embodiment of the present invention provides, magnetic pole 23 adopts high energy product neodymium iron boron magnetite, and pass through the combination of the relation between the number of magnetic pole 23 and the number of winding slot 131, to increase the periodicity that least common multiple counting method increases cogging torque, thus realize the amplitude reducing cogging torque, improve the stationarity of rotating.This external rotor brushless motor, it is small, efficiency is high, moment is large, cogging torque is little, highly sensitive.Can be widely used in very high the taking photo by plane, daily shooting, on the device such as moving camera shooting, improve the quality of photograph taking of motor performance requirement.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement or improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. an external rotor brushless motor, comprise stator module and rotor assembly, it is characterized in that, described stator module comprises bonnet, stator winding and stator core, one end, center of described bonnet is to the cylindrical boss being outside equipped with hollow, described stator core is vertically fixed on the lateral wall of described boss, and described stator core has multiple winding slot, is all wound with described stator winding in each described winding slot; Described rotor assembly comprises protecgulum, rotating shaft and casing, the madial wall of described casing is provided with multiple ndfeb magnetic pole according to by increasing with the relation of its least common multiple according to the number of winding slot, described protecgulum center offers the through hole for installing described rotating shaft, one end of described rotating shaft is fixedly connected in described through hole, the other end passes described bonnet via the hollow channel extension of described boss, described casing is fixedly connected on described protecgulum, and is located at the periphery of described stator core.
2. external rotor brushless motor as claimed in claim 1, is characterized in that, the equidistant circumference array of each described magnetic pole on the madial wall of described casing, and and between described stator core, there is running clearance, the polarity described in adjacent two between magnetic pole is contrary.
3. external rotor brushless motor as claimed in claim 1, it is characterized in that, described protecgulum is provided with the separation trough for installing fixing described magnetic pole, one end of described magnetic pole is inserted in described separation trough.
4. external rotor brushless motor as claimed in claim 1, it is characterized in that, described winding slot number is 12, and the number of described magnetic pole is 14.
5. external rotor brushless motor as claimed in claim 4, it is characterized in that, the width of described winding slot opening is 0.5 ~ 2mm.
6. external rotor brushless motor as claimed in claim 5, it is characterized in that, the width of described winding slot opening is 1.5mm.
7. as the external rotor brushless motor in claim 1 to 6 as described in any one, it is characterized in that, described spindle central and described bonnet central coaxial are arranged, and are rotationally connected by bearing and described bonnet, described bonnet offer the installing hole for installing fixing described bearing.
8. as the external rotor brushless motor in claim 1 to 6 as described in any one, it is characterized in that, described bonnet also offering the fixing hole for installing fixed electrical machinery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410849816.1A CN104505966A (en) | 2014-12-30 | 2014-12-30 | Outer rotor brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410849816.1A CN104505966A (en) | 2014-12-30 | 2014-12-30 | Outer rotor brushless motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104505966A true CN104505966A (en) | 2015-04-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410849816.1A Pending CN104505966A (en) | 2014-12-30 | 2014-12-30 | Outer rotor brushless motor |
Country Status (1)
| Country | Link |
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| CN (1) | CN104505966A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743262A (en) * | 2016-04-22 | 2016-07-06 | 麦永冲 | External rotor motor |
| WO2020211494A1 (en) * | 2019-04-15 | 2020-10-22 | 佛山市启正电气有限公司 | Low-rotation-speed large-torque outer rotor, electric motor, and ceiling fan |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2583870Y (en) * | 2002-11-14 | 2003-10-29 | 艾欧史密斯电气产品(常州)有限公司 | Outside rotor brushless dc motor |
| JP2006050709A (en) * | 2004-08-02 | 2006-02-16 | Matsushita Electric Ind Co Ltd | Electric power steering device |
| CN203775003U (en) * | 2014-03-24 | 2014-08-13 | 中山大洋电机制造有限公司 | Direct-current brushless outer rotor motor and air blower of application thereof |
| CN204425079U (en) * | 2014-12-30 | 2015-06-24 | 深圳市双环全新机电股份有限公司 | External rotor brushless motor |
-
2014
- 2014-12-30 CN CN201410849816.1A patent/CN104505966A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2583870Y (en) * | 2002-11-14 | 2003-10-29 | 艾欧史密斯电气产品(常州)有限公司 | Outside rotor brushless dc motor |
| JP2006050709A (en) * | 2004-08-02 | 2006-02-16 | Matsushita Electric Ind Co Ltd | Electric power steering device |
| CN203775003U (en) * | 2014-03-24 | 2014-08-13 | 中山大洋电机制造有限公司 | Direct-current brushless outer rotor motor and air blower of application thereof |
| CN204425079U (en) * | 2014-12-30 | 2015-06-24 | 深圳市双环全新机电股份有限公司 | External rotor brushless motor |
Non-Patent Citations (1)
| Title |
|---|
| 张科: "永磁电机齿槽转矩研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743262A (en) * | 2016-04-22 | 2016-07-06 | 麦永冲 | External rotor motor |
| WO2020211494A1 (en) * | 2019-04-15 | 2020-10-22 | 佛山市启正电气有限公司 | Low-rotation-speed large-torque outer rotor, electric motor, and ceiling fan |
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| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
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Application publication date: 20150408 |