CN1645719A - Permanent magnet electric motor with double rotor - Google Patents
Permanent magnet electric motor with double rotor Download PDFInfo
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- CN1645719A CN1645719A CN 200410075764 CN200410075764A CN1645719A CN 1645719 A CN1645719 A CN 1645719A CN 200410075764 CN200410075764 CN 200410075764 CN 200410075764 A CN200410075764 A CN 200410075764A CN 1645719 A CN1645719 A CN 1645719A
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Abstract
The invention adopts ferrite permanent magnet and a special inside and outside rotator magnet structure, which has dual rotators sharing one stator with cylindrical form iron core and can effectively increase magnetic flux density of inner and outside air gap generated from ferrite magnet. The 2.2KW dual rotators permanent electric machine has 1Nm/Kg torque density, 87% operating efficiency.
Description
(1) technical field
The invention belongs to magneto, particularly relate to the ferrite permanent-magnet motor technology.
(2) background technology
High operational efficiency and high torque density are the Essential Performance Requirements of motor, and rare-earth permanent-magnet electric machine is owing to the high performance rare earth magnet of employing is easy to satisfy this requirement, but the employing of expensive rare earth magnet has improved the manufacturing cost of motor greatly; The ferrite permanent-magnet motor has very low manufacturing cost because of used magnet material is cheap, but the magnet magnetic property is low, and makes motor have lower operational efficiency and very low torque density.Therefore magneto is because the contradiction of price and performance is difficult to extensive popularization and application.
The external public double-rotor radial magnetic field permanent magnet motor of sending out is to be nested together and the New-type electric machine of a shared stator by an outer-rotor permanent magnet motor and internal rotor permanent-magnetic motor, it can replace rare earth permanent magnet with cheap ferrite permanent-magnet, but still has higher efficient and torque density.This motor was seen in document first also at first by propositions such as American Thomas A Lipo in 2003.The cost advantage of this motor comes from the employing of ferrite permanent-magnet, and performance advantage only comes from the innovation of its structure.But this motor inner and outer rotors magnet adopts the conventional magnet structure, the piece number that is motor inner and outer rotors magnet all equates with the number of poles of motor, every magnet forms a magnetic pole of motor, so the not variation of the essence of the low air gap flux density of this motor, has limited the further raising of this kind motor performance; Simultaneously, this motor adopts conventional magnet structure, and the air gap flux density waveform that is produced is a trapezoidal wave, so the phase potential waveform also is trapezoidal wave, and does not fit into the sine ac power supply power supply.
(3) summary of the invention
The present invention provides a kind of novel dual rotor permanent magnetic motor for addressing the above problem.
The present invention is on the basis of above-mentioned dual rotor permanent magnetic motor, by adopting novel magnet structure, effectively improve the air gap flux density of inside and outside rotor, inner and outer rotors yoke portion magnetic is close can to reduce even save inner and outer rotors magnetic conductive iron yoke thereby reduce, thereby further improves the operational efficiency and the torque density of birotor ferrite permanent-magnet motor; By adopting this novel magnet structure, can effectively guarantee the sine of inside and outside rotor airgap magnetic flux density waveforms simultaneously, thereby guarantee the sine of motor phase potential waveform.
This dual rotor permanent magnetic motor is made up of the stator between inside and outside p-m rotor and the birotor, forms the outer air gap of motor between external rotor and the stator, forms the interior air gap of motor between internal rotor and the stator, and inner and outer rotors is fixed together in the end and rotation synchronously.
External rotor is made up of external rotor magnetic conductive iron yoke and the permanent magnet be close in it, and the every utmost point magnet of external rotor is made up of the magnet block that two or more than two has the rule that necessarily magnetizes.This kind magnet structure is compared with conventional external rotor magnet structure, and it is close to have improved motor gas-gap magnetic, and the magnetic that has reduced in the external rotor magnetic conductive iron yoke is close.
Internal rotor is by internal rotor magnetic conductive iron yoke and be close to its outer permanent magnet and form, the every utmost point magnet of internal rotor is made up of two or more than two the magnet block with the rule that necessarily magnetizes equally, this magnet structure can improve the air gap flux density of air gap in the motor, and the magnetic that reduces in the internal rotor magnetic conductive iron yoke is close.
The shared stator of the inner and outer rotors of motor, this stator are fixed on the vertical static end cap vertically.Stator is made up of stator core and stator winding.Stator core is a cylindrical structural, and outer surface has equally distributed teeth groove to place stator winding within it.Two effective edges of each coil of stator winding lay respectively in the inside and outside stator slot, and the centerline average of these two grooves is positioned on the same radial direction, also can misplace to some extent.The inside and outside air-gap field of motor is all with the part of stator core yoke as its closed magnetic circuit, and has identical direction in the stator core yoke.Therefore in each coil of stator winding, the effective edge that is arranged in the stator water jacket interacts with outer air gap magnet, and the effective edge that is arranged in the stator inside groove interacts with outer air-gap field.
The torque density of motor is directly proportional with motor gas-gap surface area, air gap flux density value, dual rotor permanent magnetic motor of the present invention, not only having inside and outside two air gaps, to have increased air gap surface long-pending, and increased the inner and outer rotors air gap flux density owing to the inner and outer rotors magnet all adopts special magnet structure, therefore increased the torque density of motor; Simultaneously special magnet structure of the present invention can make the close reduction of inner and outer rotors yoke portion magnetic a lot, significantly reduces even saves inner and outer rotors magnetic conductive iron yoke, greatly reduces the volume and weight of motor, thereby improves the torque density of motor more.The special stator coil structure of double-rotor machine can effectively improve motor copper cash utilance, reduce winding resistance, the special magnet structure that is adopted has simultaneously improved magnetic loading effectively, thereby has reduced electric loading, therefore can effectively reduce the copper loss of motor, improve the operational efficiency of motor.
Dual rotor permanent magnetic motor of the present invention adopts special inner and outer rotors magnet structure, not only make the close raising of inside and outside rotor airgap magnetic, make the close reduction of inner and outer rotors yoke portion magnetic, thereby improve the operational efficiency and the torque density of motor, and make the inner and outer rotors air gap flux density be Sine distribution, can guarantee that the winding electromotive force is Sine distribution.
(4) description of drawings
Fig. 1 is the cross-sectional view of dual rotor permanent magnetic motor.
Fig. 2 is the shaft section figure of dual rotor permanent magnetic motor: form external rotor by external rotor magnetic conductive iron yoke 1, external rotor magnet 2, form internal rotor by rotating shaft 8, internal rotor magnetic conductive iron yoke 7 and internal rotor magnet 6.Inside and outside rotor is fixed together by garden, end dish 9 and is supported on stationary holder 13 and the vertical static end cap 10 by bearing 11,12.Stator 4 is fixed on the vertical static end cap 10.Form the outer air gap 3 of motor between external rotor and the stator, form the interior air gap 5 of motor between internal rotor and the stator.
Fig. 3 is inside and outside rotor magnet figure: be made up of the magnet block of polylith same structure size, different magnetizing directions respectively.θ wherein
iThe position of representing a certain magnet block, the direction of arrow are this magnet block magnetizing direction, and use angle θ
mExpression, θ
m=(1 ± p) θ
i, when being used as outer magnet, magnet block gets "+", when being used as inner magnet, magnet block gets "-", and p is the number of pole-pairs of motor.
Fig. 4, Fig. 5, Fig. 6, in when Fig. 7 is respectively 2 magnets of the every utmost point of 4 utmost point dual rotor permanent magnetic motors and 3 magnets, the instance graph of external rotor magnet: the external rotor magnet structure when wherein Fig. 4 is 2 magnets of the every utmost point of 4 utmost point dual rotor permanent magnetic motors, internal rotor magnet structure when Fig. 5 is 2 magnets of the every utmost point of 4 utmost point dual rotor permanent magnetic motors, external rotor magnet structure when Fig. 6 is 3 magnets of the every utmost point of 4 utmost point dual rotor permanent magnetic motors, internal rotor magnet structure when Fig. 7 is 3 magnets of the every utmost point of 4 utmost point dual rotor permanent magnetic motors, at Fig. 3, Fig. 4, Fig. 5, Fig. 6, among Fig. 7, the direction of arrow is the magnetizing direction of magnet block.The number of pole-pairs of motor can be an arbitrary integer, and the every utmost point magnet block of motor number can be the arbitrary integer greater than 1.
Fig. 8 is the Distribution of Magnetic Field figure that 4 magnets of every utmost point, 4 pole external-rotor magnet structures produce, and wherein the direction of arrow is the magnet magnetizing direction, and each closed curve is represented magnetic field magnetic line.The magnet external magnetic field is very weak as can be seen, and internal magnetic field is very strong; Therefore the conductive magnetic yoke of magnet outside can be very thin even can saves the outside conductive magnetic yoke of magnet, has very strong internal magnetic field simultaneously.
Fig. 9 is the Distribution of Magnetic Field figure that 4 magnets of every utmost point, 4 utmost point internal rotor magnet structures produce, and wherein the direction of arrow is the magnet magnetizing direction, and each closed curve is represented the magnetic line of force.The magnet internal magnetic field is very weak as can be seen, and the external magnetic field is very strong; Therefore the conductive magnetic yoke of magnet inside can be very thin even can saves the inner conductive magnetic yoke of magnet, has very strong external magnetic field simultaneously.
Figure 10 is the stator stereogram of dual rotor permanent magnetic motor, is made up of stator core 1 and stator winding 2.
Figure 11 is the shaft section figure of stator, and wherein 1 is stator core, and 2 is two effective edges of a coil of stator winding.
(5) specific embodiments
The enforcement of dual rotor permanent magnetic motor is assemblied by birotor enforcement, stator enforcement and birotor and stator.Birotor is implemented as Fig. 1-shown in Figure 10.The internal rotor magnetic conductive iron yoke 7 of drum type is enclosed within the rotating shaft 8, and the external rotor magnetic conductive iron yoke 1 of drum type is fixedly connected in the rotating shaft 8 by end face garden dish 9, inner and outer rotors magnetic conductive iron yoke axle to length close and substantially over against; According to desired motor pole number and every utmost point magnet block number, make the magnet block of forming external rotor magnet 2 and internal rotor magnet 6, each magnet block physical dimension of forming the external rotor magnet is identical, and each magnet block physical dimension of forming the internal rotor magnet is also identical.Each magnet block is magnetized by magnet magnetizing direction shown in Figure 3, then with each magnet block by shown in Figure 3 be placed on successively on the external rotor magnetic conductive iron yoke inner surface and the outer surface of internal rotor magnetic conductive iron yoke on, constitute external rotor magnet 2 and internal rotor magnet 6.
Stator is implemented as Figure 11, shown in Figure 12.By punching out stator iron-core lamination shown in Figure 11, axial length on request laminates the stator core that lamination forms motor, place stator coil by mode shown in Figure 12, and according to certain rules each coil is interconnected and form stator winding, form the stator of dual rotor permanent magnetic motor like this.
The assembling of birotor and stator: will be supported on the vertical stationary holder 13 by bearing 11 near the rotating shaft axle head of end face garden dish 9; Stator one end is fixed on the vertical static end cap 10 vertically; Another axle head of rotating shaft is supported on the vertical static end cap 10 by bearing 12.
The 2.2kW birotor ferrite permanent-magnet motor of invention is compared with the commercial induction machine and the built-in Nd-Fe-B permanent-magnet motor of similar power, and torque density is respectively 1Nm/kg, 0.35Nm/kg, 0.5Nm/kg, and efficient is respectively 87%, 82%, 86%.Therefore double-rotor machine is compared with induction machine and interior permanent magnet machines and is had high efficient and torque density, and the high torque density of dual rotor permanent magnetic motor just means that the volume of motor is little, the consumption material is few, double-rotor machine adopts ferrite permanent-magnet simultaneously, so the dual rotor permanent magnetic motor of this invention is with low cost.
Claims (3)
1, a kind of dual rotor permanent magnetic motor, form by the stator between external rotor, internal rotor and the inner and outer rotors, the shared stator of birotor, it is characterized in that, the external rotor magnet is close to external rotor magnetic conductive iron yoke inner surface, and its every utmost point magnet is made up of the magnet block that has certain magnetizing direction rule more than 2 or 2; The internal rotor magnet is close to internal rotor magnetic conductive iron yoke outer surface, and its every utmost point magnet is made up of the magnet block that has certain magnetizing direction rule more than 2 or 2.
2, one one kinds of dual rotor permanent magnetic motors according to claim 1, it is characterized in that, the shared stator of described birotor, stator is made up of stator core and stator winding, stator core is a cylindrical structural, within it, outer surface has equally distributed teeth groove.
According to claims 1 or 2 described a kind of dual rotor permanent magnetic motors, it is characterized in that 3, two effective edges of each coil of stator winding place inside and outside stator slot respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100757643A CN100389533C (en) | 2004-12-30 | 2004-12-30 | Permanent magnet electric motor with double rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100757643A CN100389533C (en) | 2004-12-30 | 2004-12-30 | Permanent magnet electric motor with double rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1645719A true CN1645719A (en) | 2005-07-27 |
| CN100389533C CN100389533C (en) | 2008-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100757643A Expired - Fee Related CN100389533C (en) | 2004-12-30 | 2004-12-30 | Permanent magnet electric motor with double rotor |
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| CN (1) | CN100389533C (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101079559B (en) * | 2006-05-24 | 2010-06-02 | 本田技研工业株式会社 | Electric motor |
| CN102013781A (en) * | 2010-12-29 | 2011-04-13 | 北京奇峰聚能科技有限公司 | Brushless direct current motor with internal and external rotors and without core losses |
| CN102179436A (en) * | 2009-12-04 | 2011-09-14 | 尼克桑斯公司 | Device for continuous corrugation of a metallic tube |
| CN102497074A (en) * | 2011-12-26 | 2012-06-13 | 北京理工大学 | Multiphase fault tolerant permanent magnet motor based on birotor structure |
| CN101340131B (en) * | 2007-07-05 | 2012-07-18 | 松下电器产业株式会社 | Electric motor |
| CN101572452B (en) * | 2008-04-28 | 2012-12-19 | 宁波唯英能源科技有限公司 | Double-layer rotor aerogenerator |
| CN103872879A (en) * | 2014-03-05 | 2014-06-18 | 包海荣 | Reluctance-free alternating current generator |
| WO2015018083A1 (en) * | 2013-08-09 | 2015-02-12 | 深圳市配天电机技术有限公司 | Birotor motor as well as fan and compressor using same |
| CN108322002A (en) * | 2018-02-12 | 2018-07-24 | 山东大学 | A kind of fault tolerant type birotor bipolarity permanent magnet synchronous motor and method |
| CN109995218A (en) * | 2018-07-30 | 2019-07-09 | 熵零技术逻辑工程院集团股份有限公司 | A kind of motor |
| CN110311524A (en) * | 2019-06-18 | 2019-10-08 | 深圳市优必选科技股份有限公司 | A kind of drag cup brshless DC motor and robot |
| CN110601474A (en) * | 2019-09-17 | 2019-12-20 | 淮阴工学院 | Radial magnetic field composite flux switching motor |
| CN112838728A (en) * | 2020-12-30 | 2021-05-25 | 顺丰科技有限公司 | Birotor permanent magnet synchronous motor and working method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2066636U (en) * | 1990-05-16 | 1990-11-28 | 张恩侗 | Magnetogenerator |
| CN2293153Y (en) * | 1997-06-09 | 1998-09-30 | 夏成明 | Double ring magnetic pole parallel winding rare-earth permanent-magnet DC electric machine |
-
2004
- 2004-12-30 CN CNB2004100757643A patent/CN100389533C/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101079559B (en) * | 2006-05-24 | 2010-06-02 | 本田技研工业株式会社 | Electric motor |
| CN101340131B (en) * | 2007-07-05 | 2012-07-18 | 松下电器产业株式会社 | Electric motor |
| CN101572452B (en) * | 2008-04-28 | 2012-12-19 | 宁波唯英能源科技有限公司 | Double-layer rotor aerogenerator |
| CN102179436B (en) * | 2009-12-04 | 2015-03-25 | 尼克桑斯公司 | Device for continuous corrugation of a metallic tube |
| CN102179436A (en) * | 2009-12-04 | 2011-09-14 | 尼克桑斯公司 | Device for continuous corrugation of a metallic tube |
| CN102013781A (en) * | 2010-12-29 | 2011-04-13 | 北京奇峰聚能科技有限公司 | Brushless direct current motor with internal and external rotors and without core losses |
| CN102497074A (en) * | 2011-12-26 | 2012-06-13 | 北京理工大学 | Multiphase fault tolerant permanent magnet motor based on birotor structure |
| WO2015018083A1 (en) * | 2013-08-09 | 2015-02-12 | 深圳市配天电机技术有限公司 | Birotor motor as well as fan and compressor using same |
| CN105453394A (en) * | 2013-08-09 | 2016-03-30 | 深圳市配天电机技术有限公司 | Birotor motor as well as fan and compressor using same |
| CN105453394B (en) * | 2013-08-09 | 2018-09-21 | 深圳市配天电机技术有限公司 | A kind of double-rotor machine and fan, compressor using this motor |
| CN103872879A (en) * | 2014-03-05 | 2014-06-18 | 包海荣 | Reluctance-free alternating current generator |
| CN108322002A (en) * | 2018-02-12 | 2018-07-24 | 山东大学 | A kind of fault tolerant type birotor bipolarity permanent magnet synchronous motor and method |
| CN109995218A (en) * | 2018-07-30 | 2019-07-09 | 熵零技术逻辑工程院集团股份有限公司 | A kind of motor |
| CN110311524A (en) * | 2019-06-18 | 2019-10-08 | 深圳市优必选科技股份有限公司 | A kind of drag cup brshless DC motor and robot |
| CN110601474A (en) * | 2019-09-17 | 2019-12-20 | 淮阴工学院 | Radial magnetic field composite flux switching motor |
| CN112838728A (en) * | 2020-12-30 | 2021-05-25 | 顺丰科技有限公司 | Birotor permanent magnet synchronous motor and working method thereof |
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| Publication number | Publication date |
|---|---|
| CN100389533C (en) | 2008-05-21 |
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