CN110752682A - Outer rotor permanent magnet motor - Google Patents
Outer rotor permanent magnet motor Download PDFInfo
- Publication number
- CN110752682A CN110752682A CN201910903678.3A CN201910903678A CN110752682A CN 110752682 A CN110752682 A CN 110752682A CN 201910903678 A CN201910903678 A CN 201910903678A CN 110752682 A CN110752682 A CN 110752682A
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- CN
- China
- Prior art keywords
- rotor
- stator
- outer rotor
- tooth
- permanent magnet
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
- H02K1/165—Shape, form or location of the slots
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2786—Outer rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention discloses an outer rotor permanent magnet motor, which comprises a stator and an outer rotor; the outer rotor comprises a rotor core and a plurality of rotor magnetic steels fixed on the inner side of the rotor core; the stator comprises a stator core and a stator winding embedded in a stator slot, the stator tooth comprises a tooth body and tooth shoes positioned on the left side and the right side of the tooth body, and the tooth body and the top surfaces of the tooth shoes on the left side and the right side form a sectional structure; the relation between the number Q of the stator slots and the number 2P of the outer rotor poles satisfies that Q is (2P +/-1): 2P, wherein P is the number of the pole pairs of the rotor. On the basis of improving the performance of the motor, the invention reduces the difficulty of the processing technology and the manufacturing cost of the motor, has the advantages of high winding coefficient, small harmonic content, low torque pulsation, high torque/power density and the like, and can be widely applied to the fields of flywheel energy storage, electric automobiles, electric propulsion and the like.
Description
Technical Field
The invention relates to the field of motors, in particular to a stator and a rotor of an outer rotor permanent magnet motor with high torque density and low pulsation and a motor related to the stator and the rotor.
Background
The external rotor set medium-winding permanent magnet motor has the advantages of small magnetic flux leakage coefficient and high torque density, and is widely applied to various fields. However, due to the existence of the magnetic steel, when the motor runs at a high speed, additional eddy current loss can be generated on the magnetic steel of the motor due to the change of a magnetic field. For the eddy current loss, the most common means is to adopt a magnetic steel segmentation mode, and reduce the eddy current on the magnetic steel by reducing the volume of the magnetic steel, thereby weakening the eddy current loss generated on the magnetic steel. The more magnetic steel segments, the better the eddy current loss weakening effect. However, the more the magnetic steel segments are, the greater the assembly difficulty is when the motor is produced and manufactured, and meanwhile, the cost of the magnetic steel is greatly increased.
Compared with a distributed winding motor, the concentrated winding group has the advantages of small end part, low cost, good manufacturability, high efficiency and the like, but the concentrated winding group has the problems of large torque fluctuation, large vibration, large noise and the like due to large air gap flux density harmonic waves.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the prior art, the outer rotor permanent magnet motor is provided, the installation difficulty is reduced, the cost is reduced, the eddy current loss of the motor can be effectively reduced, the sine degree of the air gap flux density is improved, and the torque pulsation of the motor is reduced.
The technical scheme is as follows: an outer rotor permanent magnet motor comprises a stator and an outer rotor; the outer rotor comprises a rotor core and a plurality of rotor magnetic steels fixed on the inner side of the rotor core; the stator comprises a stator core and a stator winding embedded in a stator slot, the stator tooth comprises a tooth body and tooth shoes positioned on the left side and the right side of the tooth body, and the tooth body and the top surfaces of the tooth shoes on the left side and the right side form a sectional structure; the relation between the number of stator slots Q and the number of outer rotor poles 2P satisfies Q2P +/-1 or Q2P +/-2, wherein P is the number of rotor pole pairs.
Furthermore, the stator teeth are of a bilateral symmetry structure, and the tooth body of a single stator tooth and the top surfaces of the tooth shoes on the left side and the right side are located on a regular polygon structure.
Furthermore, the stator teeth are of a bilateral symmetry structure, the top surfaces of the left and right side tooth shoes of a single stator tooth are located on a regular polygon structure, the top surface of the tooth body in the middle of the left and right side tooth shoes is an arc, and the center of the arc is the axis of the motor.
Furthermore, the section of the rotor magnetic steel perpendicular to the motor shaft is of an isosceles trapezoid structure, and the longer lower bottom of the rotor magnetic steel is fixed on the inner side of the rotor iron core.
Furthermore, the included angle between the longer lower bottom of the rotor magnetic steel and the trapezoid waist is theta1And satisfies the condition of theta < 45 DEG1＜60°。
Furthermore, the rotor magnetic steel is arranged in an axial segmentation mode, and the rotor magnetic steel on each magnetic pole is divided into a plurality of blocks in the axial direction.
Furthermore, the rotor magnetic steel on each magnetic pole of the outer rotor has the same segmentation mode, and each magnetic pole axially comprises at least two rotor magnetic steels with different axial lengths.
Further, the axial length of the rotor magnetic steel at the two end portions 1/4 of the outer rotor is L1, and the axial length of the rotor magnetic steel at the axial position center 1/2 is L2, wherein L2> L1.
Furthermore, two rectangular bulges are arranged on the inner side of the stator back yoke of the stator.
Furthermore, n axial grooves are uniformly formed in the outer side of the outer rotor, wherein n is 2P, and the axial grooves are located on the axis of the rotor magnetic pole.
Has the advantages that: the outer rotor permanent magnet motor reduces the difficulty of the production process and the manufacturing cost of the motor on the basis of improving the performance of the motor, has the advantages of high winding coefficient, low harmonic content, low torque pulsation, high torque/power density and the like, and can be widely applied to the fields of flywheel energy storage, electric automobiles, electric propulsion and the like.
Drawings
Fig. 1 is a schematic structural diagram of an outer rotor permanent magnet motor;
FIG. 2 is a schematic view of a stator structure;
FIG. 3 is a schematic structural view of an outer rotor;
FIG. 4 is a schematic view of an axially segmented rotor size configuration.
Detailed Description
The invention is further explained below with reference to the drawings.
Example 1: as shown in fig. 1, an outer rotor permanent magnet motor includes a stator and an outer rotor. The outer rotor comprises a rotor core 3 and a plurality of rotor magnetic steels 4 fixed on the inner side of the rotor core 3. The stator comprises a stator core 1 and a stator winding 2 embedded in a stator slot, the stator teeth 6 comprise tooth bodies 6a and tooth shoes 6b positioned on the left side and the right side of the tooth bodies 6a, and the top surfaces of the tooth bodies 6a and the tooth shoes 6b on the left side and the right side form a sectional structure.
The relation between the number of stator slots Q and the number of outer rotor poles 2P satisfies Q2P +/-1 or Q2P +/-2, wherein P is the number of rotor pole pairs. And a proper slot pole is arranged for matching, so that the winding coefficient of the motor can be increased, the flux linkage of the motor is increased, and the output capacity of the motor is improved. The section of the rotor magnetic steel 4 perpendicular to the motor shaft is of an isosceles trapezoid structure, and the included angle between the longer lower bottom of the rotor magnetic steel 4 and the trapezoid waist is theta1And satisfies the condition of theta < 45 DEG1< 60 degrees, the longer bottom of rotor magnetic steel 4 is fixed on the inner side of rotor iron core 3, as shown in figure 3. The structure of the trapezoidal rotor magnetic steel 4 can improve the sine degree of the air gap flux density of the motor, so that the output torque pulsation is reduced, the vibration noise is reduced, and meanwhile, the trapezoidal rotor magnetic steel 4 can save permanent magnet materials and reduce the cost.
Because the stator magnetic field of the concentrated coil motor is concentrated, the harmonic content of the air gap magnetic field is higher, and the torque pulsation of the motor is larger. The stator teeth 6 are arranged into a multi-section structure, so that the air gap flux density harmonic component can be reduced, and the motor torque pulsation is reduced. As shown in fig. 2, the stator teeth 6 have a symmetrical structure, and the tooth body 6a and the top surfaces of the left and right tooth shoes 6b of a single stator tooth 6 are located on a regular polygonal structure.
In order to reduce the eddy current loss of the rotor magnetic steel 4, the rotor magnetic steel 4 is divided into a plurality of sections in the axial direction. Because the number of the rotor magnetic steel 4 segments directly influences the cost of the rotor magnetic steel 4 and the assembly difficulty of the magnetic steel, on the basis of effectively weakening the eddy current loss, the number of the rotor magnetic steel 4 segments is more and more, and the better the rotor magnetic steel is. The magnetic steel at the two ends of the rotor is influenced by the end effect, and the generated eddy current loss is small. Therefore, the axial length of the rotor magnetic steel 4 close to the two ends can be longer, and the axial length of the magnetic steel close to the center is smaller. As shown in fig. 4, the axial length of rotor magnetic steel 4 at 1/4 at both ends of the rotor is L1, and the axial length of rotor magnetic steel 4 at axial position center 1/2 is L2, where L2> L1.
Two rectangular bulges are arranged on the inner side of a stator back yoke of the stator and used for fixing the stator. The outer side of outer rotor evenly sets up n axial recess 5, and wherein n equals 2P, and axial recess 5 is located rotor magnetic pole axis department. The arrangement of the groove 5 is beneficial to the connection of the rotor and the outside, and meanwhile, the arrangement of the groove 5 at the center of the magnetic pole does not influence the trend of the magnetic field inside the rotor.
Example 2: the only difference from example 1 is: the top surfaces of the left and right side tooth shoes 6b of a single stator tooth 6 are positioned on a regular polygon structure, the top surface of the tooth body 6a in the middle of the left and right side tooth shoes 6b is an arc, and the center of the arc is the axis of the motor.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An outer rotor permanent magnet motor, its characterized in that: comprises a stator and an outer rotor; the outer rotor comprises a rotor iron core (3) and a plurality of rotor magnetic steels (4) fixed on the inner side of the rotor iron core (3); the stator comprises a stator core (1) and a stator winding (2) embedded in a stator slot, the stator teeth (6) comprise tooth bodies (6a) and tooth shoes (6b) positioned on the left side and the right side of the tooth bodies (6a), and the top surfaces of the tooth bodies (6a) and the tooth shoes (6b) on the left side and the right side form a segmented structure; the relation between the number of stator slots Q and the number of outer rotor poles 2P satisfies Q2P +/-1 or Q2P +/-2, wherein P is the number of rotor pole pairs.
2. The outer rotor permanent magnet machine of claim 1, wherein: the stator teeth (6) are of a bilateral symmetry structure, and the top surfaces of the tooth bodies (6a) and the tooth shoes (6b) on the left side and the right side of a single stator tooth (6) are located on a regular polygon structure.
3. The outer rotor permanent magnet machine of claim 1, wherein: the stator teeth (6) are of a bilateral symmetry structure, the top surfaces of the left and right side tooth shoes (6b) of a single stator tooth (6) are located on a regular polygon structure, the top surfaces of the tooth bodies (6a) in the middle of the left and right side tooth shoes (6b) are circular arcs, and the circle center of each circular arc is the axis of the motor.
4. The outer rotor permanent magnet machine of any of claims 1-3, wherein: the section of the rotor magnetic steel (4) perpendicular to the motor shaft is of an isosceles trapezoid structure, and the longer lower bottom of the rotor magnetic steel (4) is fixed on the inner side of the rotor iron core (3).
5. The outer rotor permanent magnet machine of claim 4, wherein: the included angle between the longer lower bottom of the rotor magnetic steel (4) and the trapezoid waist is theta1And satisfies the condition of theta < 45 DEG1＜60°。
6. The outer rotor permanent magnet machine of any of claims 1-3, wherein: the rotor magnetic steel (4) is arranged in an axial segmentation mode, and the rotor magnetic steel (4) on each magnetic pole is divided into a plurality of blocks in the axial direction.
7. The outer rotor permanent magnet machine of claim 6, wherein: the rotor magnetic steel (4) on each magnetic pole of the outer rotor has the same segmentation mode, and each magnetic pole axially comprises at least two rotor magnetic steels (4) with different axial lengths.
8. The outer rotor permanent magnet machine of claim 7, wherein: the axial length of the rotor magnetic steel (4) positioned at the two end portions 1/4 of the outer rotor is L1, the axial length of the rotor magnetic steel (4) positioned at the axial position center 1/2 is L2, and L2 is greater than L1.
9. The outer rotor permanent magnet machine of any of claims 1-3, wherein: two rectangular bulges are arranged on the inner side of a stator back yoke of the stator.
10. The outer rotor permanent magnet machine of any of claims 1-3, wherein: the outer side of the outer rotor is uniformly provided with n axial grooves (5), wherein n is 2P, and the axial grooves (5) are positioned on the axis of the magnetic poles of the rotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910903678.3A CN110752682A (en) | 2019-09-24 | 2019-09-24 | Outer rotor permanent magnet motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910903678.3A CN110752682A (en) | 2019-09-24 | 2019-09-24 | Outer rotor permanent magnet motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110752682A true CN110752682A (en) | 2020-02-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910903678.3A Pending CN110752682A (en) | 2019-09-24 | 2019-09-24 | Outer rotor permanent magnet motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110752682A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022208376A1 (en) | 2022-08-11 | 2024-02-22 | Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Würzburg | Brushless electric motor for a radiator fan |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090250935A1 (en) * | 2006-04-14 | 2009-10-08 | Unison Co., Ltd. | Rotor for wind turbine and assembling method thereof |
| CN102099984A (en) * | 2008-10-15 | 2011-06-15 | 松下电器产业株式会社 | Dual-rotor motor |
| CN102780294A (en) * | 2012-08-22 | 2012-11-14 | 南车株洲电机有限公司 | Permanent magnet motor |
| JP2014236592A (en) * | 2013-06-03 | 2014-12-15 | 株式会社ジェイテクト | Rotor for dynamo-electric machine and manufacturing method therefor |
| CN105703506A (en) * | 2016-03-14 | 2016-06-22 | 南京航空航天大学 | Motor rotor structure capable of reducing eddy-current loss |
| CN105827035A (en) * | 2016-05-17 | 2016-08-03 | 浙江绿源电动车有限公司 | Magnetic steel sheet and processing method thereof, rotor, motor, and electric vehicle |
| CN107516988A (en) * | 2016-06-16 | 2017-12-26 | 广东力好科技股份有限公司 | External rotor permanent magnet synchronous hub motor used for electric vehicle |
| CN108512383A (en) * | 2017-02-28 | 2018-09-07 | 日本电产株式会社 | Motor |
| CN109193985A (en) * | 2018-11-15 | 2019-01-11 | 珠海格力电器股份有限公司 | Rotor, magneto and washing machine |
-
2019
- 2019-09-24 CN CN201910903678.3A patent/CN110752682A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090250935A1 (en) * | 2006-04-14 | 2009-10-08 | Unison Co., Ltd. | Rotor for wind turbine and assembling method thereof |
| CN102099984A (en) * | 2008-10-15 | 2011-06-15 | 松下电器产业株式会社 | Dual-rotor motor |
| CN102780294A (en) * | 2012-08-22 | 2012-11-14 | 南车株洲电机有限公司 | Permanent magnet motor |
| JP2014236592A (en) * | 2013-06-03 | 2014-12-15 | 株式会社ジェイテクト | Rotor for dynamo-electric machine and manufacturing method therefor |
| CN105703506A (en) * | 2016-03-14 | 2016-06-22 | 南京航空航天大学 | Motor rotor structure capable of reducing eddy-current loss |
| CN105827035A (en) * | 2016-05-17 | 2016-08-03 | 浙江绿源电动车有限公司 | Magnetic steel sheet and processing method thereof, rotor, motor, and electric vehicle |
| CN107516988A (en) * | 2016-06-16 | 2017-12-26 | 广东力好科技股份有限公司 | External rotor permanent magnet synchronous hub motor used for electric vehicle |
| CN108512383A (en) * | 2017-02-28 | 2018-09-07 | 日本电产株式会社 | Motor |
| CN109193985A (en) * | 2018-11-15 | 2019-01-11 | 珠海格力电器股份有限公司 | Rotor, magneto and washing machine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022208376A1 (en) | 2022-08-11 | 2024-02-22 | Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Würzburg | Brushless electric motor for a radiator fan |
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Application publication date: 20200204 |
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| RJ01 | Rejection of invention patent application after publication |