CN204089544U - External rotor electric machine - Google Patents
External rotor electric machine Download PDFInfo
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- CN204089544U CN204089544U CN201420473888.6U CN201420473888U CN204089544U CN 204089544 U CN204089544 U CN 204089544U CN 201420473888 U CN201420473888 U CN 201420473888U CN 204089544 U CN204089544 U CN 204089544U
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Abstract
The utility model relates to a kind of external rotor electric machine, its rotor case internal fixtion is provided with some permanent magnets, described some permanent magnet adopts identical watt shape hexahedron structure and circumferentially regularly arranged with axial both direction, arbitrary circumference and arbitrary described permanent magnet quantity axially arranged are multiple, two peripheral side of described permanent magnet are the tapered plane shape of inner side top rake shape, its top rake angle is 5-35 degree, it is linear that described permanent magnet cross section outward flange is diametrically the circular arc that is positioned on the axis of described rotor case of the center of circle, described permanent magnet cross section inward flange is diametrically single circular arc or the curve for being interconnected to by multiple circular arc, described permanent magnet adopts high-performance Ne-Fe-B material, length is between 30-95mm, the thickness of described permanent magnet is between 8-18mm.The good stability run under the utility model low speed, vibrate little, noise is low, exerts oneself large, is specially adapted to the crane hoisting mechanism etc. that reel directly drives.
Description
Technical field
The utility model relates to a kind of external rotor electric machine, particularly low-speed big external rotor permanent magnet synchronous machine.
Background technology
Existing external rotor permanent magnet synchronous machine generally includes external rotor and is positioned at the stator of described external rotor, described stator fixed installation on center shaft, the two ends of described external rotor are fixedly connected with fixed disk, described fixed disk is rotatably connected with described central shaft by rotor bearing, the rotor case that described external rotor comprises tubular and the permanent magnet be fixedly located in rotor case, stator comprises by the stacked stator core of punched lamination and the winding that is inlaid in stator core, winding connects AC power according to certain mode, the permanent magnet interaction on rotating magnetic field and external rotor is produced when winding energising, external rotor is driven to rotate around central shaft.But, because the excitation field of its p-m rotor or stator winding are not desirable Sine distribution, there is obvious pulsating torque when low speed (comprising Ultra-Low Speed) runs, affect the stability that motor runs, vibration is large, noise is high, seriously hinders its application under the low speed.
Summary of the invention
In order to overcome the above-mentioned defect of prior art, the utility model provides a kind of external rotor electric machine, and this motor can run under the low speed, and the good stability run under the low speed, vibrate little, noise is low.
The technical scheme that the utility model adopts: a kind of external rotor electric machine, comprise external rotor and the stator being positioned at described external rotor, described stator fixed installation on center shaft, the two ends of described external rotor are fixedly connected with fixed disk, described fixed disk is rotatably connected with described central shaft by rotor bearing, described external rotor comprises the rotor case of tubular, described rotor case internal fixtion is provided with some permanent magnets, described some permanent magnet adopts identical watt shape hexahedron structure and circumferentially regularly arranged with axial both direction, arbitrary circumference and arbitrary described permanent magnet quantity axially arranged are multiple, two peripheral side of described permanent magnet are the tapered plane shape of inner side top rake shape, its top rake angle is 5-35 degree, in described two fixed disks, fixed disk is furnished with the brake tongs device of formation disk brake supporting with it, this fixed disk forms the brake disc of described disk brake, another fixed disk connects rotary encoder.
The beneficial effects of the utility model: form external rotor magnetic field owing to have employed some permanent magnets regularly arranged on circumferential and axial, be conducive to the optimization realizing magnetic field structure; Particularly owing to circumference have employed multiple permanent magnet, and two of permanent magnet peripheral side are the tapered plane shape of the inner side top rake shape of 5-35 degree, significantly reduce the aberration rate of field waveform; Owing to axially adopting multiple permanent magnet, be conducive to the length reducing permanent magnet, eliminate significantly or inhibit high order harmonic component.According to the experiment of applicant, relative to the conventional design under prior art, under the utility model preferred embodiment, the aberration rate of air-gap field waveform can reduce by 50%-80%, air-gap field irregularity of wave form is made to control below 15% or 10%, the aberration rate of back emf waveform controls below 10% or 8%, increase substantially the running stability of motor thus, reduce noise, reduce torque pulsation and contribute to increasing torque and export, be specially adapted to the crane that reel directly drives (using external rotor as reel), port machine, tower machine, elevator, hoist engine and other similar applications, due to the fixed disk of one end is connected to rotary encoder, position and the motor message of external rotor can be gathered by rotary encoder accurately, these signals are used for the control of motor power/frequency converter, are conducive to the running status improving motor, due to be provided with can with the brake tongs device of the supporting formation disk brake of the fixed disk of one end, the braking to external rotor can be realized, particularly when adopting electric braking to realize motor stalling, the maintenance of external rotor position can be realized after motor stops, to adapt to the application under the occasions such as crane hoisting mechanism by caliper brake.
Accompanying drawing explanation
Fig. 1 is general structure schematic diagram of the present utility model;
Fig. 2 (a), 2(b) and 2(c) be respectively the schematic diagram of the three kinds of embodiments relating to permanent magnet shape of cross section;
Fig. 3 is the axial schematic diagram that the utility model relates to an embodiment of permanent magnet mounting structure;
Fig. 4 is the axial schematic diagram of another embodiment that the present invention relates to permanent magnet mounting structure;
Fig. 5 is the axial schematic diagram that the utility model relates to motor body partial cross sectional.
Embodiment
See Fig. 1-5, the external rotor electric machine that the utility model provides comprises external rotor and is positioned at the stator 1 of described external rotor, and described stator is fixedly mounted on central shaft 2, and the two ends of central shaft are fixedly supported in two bearings 9 respectively.The two ends of described external rotor are fixedly connected with fixed disk 3, described fixed disk is rotatably connected with described central shaft by rotor bearing 4, described external rotor comprises the rotor case 5 of tubular, described rotor case internal fixtion is provided with some permanent magnets 6, described some permanent magnet adopt identical watt shape hexahedron structure and circumferentially (direction circumferentially) and axis (being parallel to the direction of center shaft axis) both direction regularly arranged, arbitrary circumference and arbitrary described permanent magnet quantity axially arranged are multiple, two peripheral side of described permanent magnet are the tapered plane shape of inner side top rake shape, its top rake angle θ is 5-35 degree.When producing rotating magnetic field after stator winding electrifying, external rotor is driven to rotate and Driving Torque.In described two fixed disks, fixed disk is furnished with the brake tongs device of formation disk brake supporting with it, and this fixed disk forms the brake disc of described disk brake, and another fixed disk connects rotary encoder.
Preferably, described some permanent magnets regular distribution mode in the circumferential and is axially for circumferentially aliging in the circumferential and being uniformly distributed, linearly align in the axial direction and be uniformly distributed, not only be conducive to circumference distribution and the axial distribution of each permanent magnet of reasonable arrangement thus, realize magnetic field optimization, and structure is simple, be convenient to processing, installation and maintenance.
Preferably, between the described permanent magnet that circumference is adjacent, leave spacing, be conducive to thus optimizing magnetic field and being convenient to install.
Preferably, the installation fixed form of described permanent magnet in described rotor case can adopt any one mode following:
(1) see Fig. 3, the inner surface of described rotor case be provided with somely axially to extend, the spaced and dovetail groove adapted with the shape and size of described permanent magnet of circumference, described permanent magnet is inlaid in corresponding dovetail groove;
(2) see Fig. 4, be provided with axially extended fixing press strip 7 between the described permanent magnet that circumference is adjacent, described axially extended fixing press strip is pressed on described rotor case and with the side, both sides of described permanent magnet by screw fastening.
Mounting means is planted for above-mentioned (1), described being inlaid between permanent magnet in corresponding dovetail groove and described dovetail groove can bond mutually, mounting means is planted for above-mentioned (2), the cross section of described axially extended fixing press strip can be rectangular or trapezoidal, also can be provided with not magnetic conduction binding agent 8 between the radial outer side of described axially extended fixing press strip and the inwall of described rotor case, improve the fastness of installation thus and can not have a negative impact to magnetic field.
Square-section is easy to processing, and trapezoid cross section can make the respective side of both sides and corresponding permanent magnet closely fit, and is conducive to improving fastness and reliability.Alleged trapezoidally comprise trapezoidal and contour approximation alleged by geometry shape trapezoidal alleged by the geometry, be made up of four edges, its upper base and go to the bottom edge line can be curved, each line junction can be horn shape, also can in level and smooth easement curve shape, equally, described rectangle comprises the shape of trapezoidal and contour approximation alleged by geometry rectangle alleged by the geometry.
Preferably, mounting means (when being namely provided with axially extended fixing press strip between the described permanent magnet that circumference is adjacent) is planted for above-mentioned (2), two axial sides of described permanent magnet also can be the tapered plane shape of inner side top rake shape, leave spacing between axially adjacent described permanent magnet and be provided with the circumferential fixing press strip extended, described axially extended fixing press strip is pressed on described rotor case and with the side, both sides of described permanent magnet by screw fastening, the cross section of described axially extended fixing press strip is rectangular or trapezoidal, the fastness that can improve installation thus is further gone forward side by side one-step optimization magnetic field.
Preferably, away from the edge of central shaft in described permanent magnet cross section (cross section perpendicular on the direction of central shaft) outward flange 61(radial direction diametrically) to be positioned on the axis of described rotor case (in permanent magnet cross section institute in the plane in the center of circle, the axis of described rotor case shows as a point, circular arc down together) is linear, near the edge of central shaft in described permanent magnet cross section inward flange 62(radial direction diametrically) curve in single circular arc or for being interconnected to by multi-section circular arc, by the optimal design of these curvilinear surface, air-gap field waveform can be improved significantly, reduce aberration rate.
Fig. 2 (a)-(c) provides the several embodiments relating to permanent magnet cross section inward flange shape diametrically:
In the embodiment that Fig. 2 (a) provides: described permanent magnet cross section inward flange is diametrically single circular arc, its center of circle is positioned on the axis of described rotor case, the radius of outward flange and inward flange is respectively R1 and R2, be formed in the permanent magnet of radial upper uniform thickness, the radial inside and outside surface of each permanent magnet is laid respectively on the corresponding face of cylinder coaxial to described rotor case, and makes spacing between permanent magnet inner surface diametrically and the outer surface of stator equal;
In the embodiment that Fig. 2 (b) provides: described permanent magnet cross section inward flange is diametrically single circular arc, its radius is equal with described permanent magnet cross section outer peripheral radius diametrically, be R1, its center of circle is positioned on the determined straight line of axis of described permanent magnet cross section outward flange mid point and described rotor case, form the structure that the thick both sides of permanent magnet central authorities are thin thus, be conducive to eliminating edge harmonic wave;
In the embodiment of Fig. 2 (c), described permanent magnet cross section inward flange diametrically can adopt the shape of Fig. 2 (a) embodiment, also the shape of Fig. 2 (b) embodiment can be adopted, its special character is the circumferential side of Fig. 2 (a) embodiment and permanent magnet cross section inward flange diametrically in Fig. 2 (b) embodiment and permanent magnet cross section to be connected by a little concave arc line (radius is R3), instead of direct connection under normal circumstances or connected by convex fillet, can more effectively reduce edge harmonic wave thus.The setting of both sides circular arc serves the effect of similar " top rake ", is conducive to further torque ripple reduction, optimizes magnetic field, eliminates or reduce the active force of high order harmonic component significantly, for motor steady operation under low speed/Ultra-Low Speed, high pulling torque provides basic guarantee.
Preferably, the length (axial length) of described permanent magnet is between 30-95mm, the thickness of described permanent magnet is (when permanent magnet is when not waiting thick structure, refer to maximum ga(u)ge) between 8-18mm, thus under the prerequisite ensureing mechanical strength and magnetic field intensity, the impact of high order harmonic component can be reduced significantly.
Preferably, described permanent magnet adopts NdFeB material, to improve magnetic property.
Preferably, the material of described permanent magnet meets following condition, to ensure that motor normally runs, improves adaptability:
(1) remanent magnetism is at more than 1.25T, and HCJ is between 20-30kOe;
(2) demagnetization curve during 150-180 DEG C is straight line, does not occur degaussing flex point or occurs degaussing flex point but its maximum degaussing working point b
mhhigher than its degaussing flex point.
Thus, it is SH, UH or EH NdFeB material that described permanent magnet should choose the trade mark, or performance quite or more excellent other may the NdFeB material of the trades mark.
Usually, described stator is made up of stator core and the winding be inlaid in the stator slot of described stator core, preferably, described stator slot adopts peariform slot, and notch size k is between 2.5-4.5mm, and winding pitch is 1, every circle coil winding is on a stator tooth, pole embrace is 0.8-0.9, can optimize stator field significantly thus, eliminates or reduces high order harmonic component, improve frequency characteristic, raising is exerted oneself, and saves material, reduces copper loss.
Preferably, pole slot fit adopts 8 pole 9 grooves, 10 pole 12 grooves, 20 pole 24 grooves, 30 pole 36 grooves, 22 pole 24 grooves, 16 pole 18 grooves or 32 pole 36 grooves, to eliminate cogging torque.
The alleged watt shape hexahedron of the utility model refers to that its main part is in the cylinder to be similar to watt, comprise the surface of two radial surfaces, two circumferential surfaces and two axis, the spaced side being connected to form cylinder between two, two surfaces of two wherein radial surfaces and circumference, two axial surfaces form the top and bottom of this cylinder, in almost fan.Arbitrary seamed edge of cylinder both can be the seamed edge that Plane intersects, surface intersection, plane and surface intersection are formed, and also can be the structure of curved surface or other any suitable seamlessly transitted.
On permanent magnet alleged by the utility model, certain surface tapered plane shape in inner side top rake shape refers to the state of the interior side direction permanent magnet inner radial surface intermediate, inclined of its radial direction.
The top rake angle of two peripheral side of the permanent magnet alleged by the utility model refers to the line of the axis of the outward flange two-end-point of permanent magnet cross section and rotor case for measuring standard, the angle of the circumferential side of permanent magnet cross section and the above-mentioned line of corresponding side.
Concave arc line alleged by the utility model refers to the entity relative to its place, the circular arc line that its bending direction makes the volume of described entity or area diminish.
Claims (10)
1. an external rotor electric machine, comprise external rotor and the stator being positioned at described external rotor, described stator fixed installation on center shaft, it is characterized in that the two ends of described external rotor are fixedly connected with fixed disk, described fixed disk is rotatably connected with described central shaft by rotor bearing, described external rotor comprises the rotor case of tubular, described rotor case internal fixtion is provided with some permanent magnets, described some permanent magnet adopts identical watt shape hexahedron structure and circumferentially regularly arranged with axial both direction, arbitrary circumference and arbitrary described permanent magnet quantity axially arranged are multiple, two peripheral side of described permanent magnet are the tapered plane shape of inner side top rake shape, its top rake angle is 5-35 degree, in described two fixed disks, fixed disk is furnished with the brake tongs device of formation disk brake supporting with it, this fixed disk forms the brake disc of described disk brake, another fixed disk connects rotary encoder.
2. external rotor electric machine as claimed in claim 1, it is characterized in that described some permanent magnets regular distribution mode in the circumferential and is axially for circumferentially aliging in the circumferential and being uniformly distributed, linearly align in the axial direction and be uniformly distributed, leave spacing between the described permanent magnet that circumference is adjacent, the installation fixed form of described permanent magnet in described rotor case adopts any one mode following:
Mode one: the inner surface of described rotor case is provided with some axially extension and the dovetail groove adapted with the shape and size of described permanent magnet, and described permanent magnet is inlaid in corresponding dovetail groove;
Mode two: be provided with axially extended fixing press strip between the described permanent magnet that circumference is adjacent, described axially extended fixing press strip is pressed on described rotor case and with the side, both sides of described permanent magnet by screw fastening.
3. external rotor electric machine as claimed in claim 2, be inlaid in described in it is characterized in that between permanent magnet in corresponding dovetail groove and described dovetail groove and mutually bond, the cross section of described axially extended fixing press strip is rectangular or trapezoidal, is provided with or is not provided with not magnetic conduction binding agent between the radial outer side of described axially extended fixing press strip and the inwall of described rotor case.
4. external rotor electric machine as claimed in claim 3, when it is characterized in that being provided with axially extended fixing press strip between the described permanent magnet that circumference is adjacent, the tapered plane shape of two axial sides also in inner side top rake shape of described permanent magnet, leave spacing between described axially adjacent permanent magnet and be provided with the circumferential fixing press strip extended, described axially extended fixing press strip is pressed on described rotor case and with the side, both sides of described permanent magnet by screw fastening, and the cross section of described axially extended fixing press strip is rectangular or trapezoidal.
5. the external rotor electric machine as described in claim 1,2,3 or 4, it is characterized in that described permanent magnet cross section outward flange is diametrically that the circular arc that is positioned on the axis of described rotor case of the center of circle is linear, described permanent magnet cross section inward flange is diametrically single circular arc or the curve for being interconnected to by multi-section circular arc.
6. external rotor electric machine as claimed in claim 5, is characterized in that described inward flange adopts any one version following:
Version one: the center of circle of the inward flange of described single circular arc is positioned on the axis of described rotor case;
Version two: the center of circle of the inward flange of described single circular arc is positioned on the determined straight line of axis of described permanent magnet cross section outward flange mid point and described rotor case, and its radius equals described outer peripheral radius;
Version three: the center of circle of the inward flange of described single circular arc is positioned on the axis of described rotor case, the circumferential side of permanent magnet cross section inward flange diametrically and permanent magnet cross section is connected by a little concave arc line;
Version four: the center of circle of the inward flange of described single circular arc is positioned on the determined straight line of axis of described permanent magnet cross section outward flange mid point and described rotor case, and its radius equals described outer peripheral radius, the circumferential side of permanent magnet cross section inward flange diametrically and permanent magnet cross section is connected by a little concave arc line.
7. external rotor electric machine as claimed in claim 6, it is characterized in that described permanent magnet adopts NdFeB material, the length of described permanent magnet is between 30-95mm, and the thickness of described permanent magnet is between 8-18mm.
8. external rotor electric machine as claimed in claim 7, is characterized in that the material of described permanent magnet meets following condition:
Condition one: remanent magnetism is at more than 1.25T, and HCJ is between 20-30kOe;
Demagnetization curve during condition two: 150-180 DEG C is straight line, does not occur degaussing flex point or occurs degaussing flex point but its maximum degaussing working point b
mhhigher than its degaussing flex point.
9. external rotor electric machine as claimed in claim 8, it is characterized in that described stator is made up of stator core and the winding be inlaid in the stator slot of described stator core, described stator slot adopts peariform slot, notch size k is between 2.5-4.5mm, winding pitch is 1, every circle coil winding is on a stator tooth, and pole embrace is 0.8-0.9.
10. external rotor electric machine as claimed in claim 9, is characterized in that its pole slot fit adopts 8 pole 9 grooves, 10 pole 12 grooves, 20 pole 24 grooves, 30 pole 36 grooves, 22 pole 24 grooves, 16 pole 18 grooves or 32 pole 36 grooves.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420473888.6U CN204089544U (en) | 2014-08-21 | 2014-08-21 | External rotor electric machine |
| DE202015101778.2U DE202015101778U1 (en) | 2014-08-21 | 2015-04-10 | External rotor motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420473888.6U CN204089544U (en) | 2014-08-21 | 2014-08-21 | External rotor electric machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204089544U true CN204089544U (en) | 2015-01-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420473888.6U Active CN204089544U (en) | 2014-08-21 | 2014-08-21 | External rotor electric machine |
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| CN (1) | CN204089544U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109274237A (en) * | 2018-09-13 | 2019-01-25 | 无锡小天鹅股份有限公司 | External rotor electric machine and washing machine with it |
| CN110115523A (en) * | 2018-02-06 | 2019-08-13 | 佛山市顺德区美的电热电器制造有限公司 | Interior DPU disk pack unit, stirring toolbox and food cooking machine |
| CN110462999A (en) * | 2017-03-27 | 2019-11-15 | 株式会社户田赛车 | Hub motor |
| CN110518767A (en) * | 2019-10-10 | 2019-11-29 | 珠海运控电机有限公司 | Electric drum permasyn morot |
| CN110994842A (en) * | 2019-12-24 | 2020-04-10 | 武汉万至达智能科技有限公司 | High-performance permanent magnet brushless motor with internal magnetism gathering characteristic |
| CN113364240A (en) * | 2021-04-28 | 2021-09-07 | 宁波赛嘉机电有限公司 | Outer rotor motor and assembling method thereof |
-
2014
- 2014-08-21 CN CN201420473888.6U patent/CN204089544U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110462999A (en) * | 2017-03-27 | 2019-11-15 | 株式会社户田赛车 | Hub motor |
| CN110115523A (en) * | 2018-02-06 | 2019-08-13 | 佛山市顺德区美的电热电器制造有限公司 | Interior DPU disk pack unit, stirring toolbox and food cooking machine |
| CN109274237A (en) * | 2018-09-13 | 2019-01-25 | 无锡小天鹅股份有限公司 | External rotor electric machine and washing machine with it |
| CN110518767A (en) * | 2019-10-10 | 2019-11-29 | 珠海运控电机有限公司 | Electric drum permasyn morot |
| CN110994842A (en) * | 2019-12-24 | 2020-04-10 | 武汉万至达智能科技有限公司 | High-performance permanent magnet brushless motor with internal magnetism gathering characteristic |
| CN113364240A (en) * | 2021-04-28 | 2021-09-07 | 宁波赛嘉机电有限公司 | Outer rotor motor and assembling method thereof |
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