CN104092342B - A kind of magnetic resistance modulation system Dual-stator brushless double-fed motor - Google Patents
A kind of magnetic resistance modulation system Dual-stator brushless double-fed motor Download PDFInfo
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- CN104092342B CN104092342B CN201410357208.9A CN201410357208A CN104092342B CN 104092342 B CN104092342 B CN 104092342B CN 201410357208 A CN201410357208 A CN 201410357208A CN 104092342 B CN104092342 B CN 104092342B
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Abstract
The invention discloses a kind of magnetic resistance modulation system Dual-stator brushless double-fed motor, including external stator, inner stator and the rotor being placed between external stator and inner stator, external stator, rotor and inner stator concentric and separate, outer air gap it is provided with between external stator and rotor, being provided with interior air gap between rotor and inner stator, the number of pole-pairs in external stator includes that external stator is unshakable in one's determination and embeds stator coring groove outside is 2pExternal stator winding;Inner stator includes that internal stator iron core and the number of pole-pairs embedded in internal stator iron core groove are 2qInner stator winding, whereinpWithqIt is respectively positive integer, andpWithqUnequal;Rotor by (p+q) individual magnetic resistance modulating unit constitute, each magnetic resistance modulating unit by alternately arranged magnetic conduction pole piece and not magnetic inductive block constitute.Owing to there is two-layer air gap in double feedback electric engine of the present invention, degree of saturation is less than two kinds of existing single stator structures, keeps the power density of double feedback electric engine to be basically unchanged while going brushization on magnetic circuit.
Description
Technical field
The present invention relates to a kind of magnetic resistance modulation system Dual-stator brushless double-fed motor, it is adaptable to frequency control occasion, the present invention
Relate to motor, mechanical field.
Background technology
Traditional double generating aid is wound rotor asynchronous machine, and rotor windings rotates with rotor, it is necessary to use electric brush slip ring will
The voltage x current rotated in winding is drawn with conduction pattern.So that double feedback electric engine has two electric ports, a machinery
Port, has good frequency control performance, is widely used in megawatt level wind power generation system and high-grade drives.
But the existence of electric brush slip ring causes motor reliability poor, maintenance cost is high.Have brush double feedback electric engine goes brushization always
The focus of people's research.
Existing brushless dual-feed motor has three kinds of structures, tandem type, nested rings rotator type and reluctance rotor formula.Wherein,
Tandem type is that two wound asynchronous motors coaxially cascade and form, and its axial length is long, it is difficult to severely limited in space
Application scenario use.Patent CN200510047247.X discloses a kind of bimorph transducer, single rotor disc brushless double-fed
Alternating current generator, two stators and a rotor are axially disposed, and rotor is positioned in the middle of two stators.Two stator cores
All near rotor-side one-side gaining, embed 2p pole and 2q pole three-phase symmetrical stator winding, two set stator winding respectively
Separate.Rotor core double surface grooving embeds 2p and 2q pole three-phase symmetrical rotor windings, two set rotor windings respectively
Connect with phase sequence or negative-phase sequence and form a set of rotor windings.Two radial flux asynchronous machines that this structure will axially cascade
Make two the axial magnetic flux asynchronous machines axially cascaded into, it is possible to realize desired dual feeding synchronous and run, but only at p=q
And can be only achieved and have brush double feedback electric engine during the two set three-phase symmetrical rotor windings negative-phase sequence connection a set of rotor windings of formation
Identical torque rotor volume ratio.As p ≠ q, inside and outside two-layer air gap electromagnetic load can not take higher value, its turn simultaneously
Square volume ratio about has 0.75 times of brush double feedback electric engine.
The two set stator winding that nested rings rotator type and reluctance rotor formula are single stator structure, i.e. number of pole-pairs different share
One stator core, therefore, the electromagnetic load of single number of pole-pairs is restricted so that torque volume ratio is also about there being brush
0.75 times of double feedback electric engine.
In order to improve the power density (power to volume ratio) of existing brushless dual-feed motor, patent CN201220025540.1
The Dual-stator brushless double-fed motor structure that a kind of radial concentric is arranged is proposed.The rotor of this motor uses inside and outside double-deck mouse
Cage winding, in rotor side axially, inside and outside layer mouse cage sliver is respectively with two separate public end ring
Connect;Rotor axially opposite side, inside and outside layer mouse cage sliver is according to each produced rotating excitation field phase
Direction of motion phase inverse correspondence for rotor itself connects.So that steady-state speed meets nr=60 (fp±fq)/(p+q),
Realize dual feeding synchronous to run.This structural requirement rotor inside and outside layer sliver number is identical, and groove number is identical.Due to bimorph transducer without
Between brush double fed electric machine rotor inside and outside layer iron core, only circuit connects and without flux coupled, ectonexine rotor core all should
Leave enough yoke portion thickness to avoid rotor core the most saturated.Rotor is increased along the thickness of radial direction, with
As a example by the Dual-stator brushless double-fed motor of p=4, q=2, the ratio of external diameter and internal diameter is up to 2:1.If still according to elder generation
The Dual-stator brushless double-fed motor rotor structure of front design, internal and external circumference fluting number is identical, certainly will cause internal layer air gap
Electric load is 2 times of outer layer air gap, and internal layer air gap magnetic loading is 2 times of outer layer air gap.Owing to internal stator iron core is saturated
Restriction, the unshakable in one's determination electromagnetic load of external stator is substantially less than inner stator, and then exerting oneself of motor unit volume is restricted.
In summary, existing brushless dual-feed motor reduces the power density of brush double feedback electric engine (about while non-brushing
Reduce 25%).
Summary of the invention
Technical problem: the present invention is directed to traditional double generating aid and there is the problem of electric brush slip ring, former from the operation of double feedback electric engine
Reason is set out, and inner stator and magnetic resistance modulation rotor are equivalent to a wound rotor, proposes a kind of magnetic resistance modulation system bimorph transducer
Brushless dual-feed motor, thus on the basis of traditional double generating aid function is fully achieved, cancel electric brush slip ring, keep simultaneously
The power density close with there being brush double feedback electric engine.
Technical scheme: for solving above-mentioned technical problem, the technical scheme is that
A kind of magnetic resistance modulation system Dual-stator brushless double-fed motor, including external stator, inner stator and be placed in described external stator and
Rotor between inner stator, described external stator, rotor and inner stator concentric and separate, external stator and rotor it
Between be provided with outer air gap, be provided with interior air gap between rotor and inner stator and it is characterized in that:
Described external stator include that external stator is unshakable in one's determination and embed stator coring groove outside in the external stator that number of pole-pairs is 2p
Winding;Described inner stator includes internal stator iron core and the inner stator that number of pole-pairs is 2q embedded in internal stator iron core groove
Winding, wherein p and q is respectively positive integer, and p with q is unequal;
Described rotor is made up of (p+q) individual magnetic resistance modulating unit, and each magnetic resistance modulating unit is along self angular bisector pair
Claim, by alternately arranged magnetic conduction pole piece and not magnetic inductive block constitute, magnetic conduction pole piece is satisfied with the width ratio of not magnetic inductive block:
ω2=2 ω3 (2)
Wherein ωsFor the width of single magnetic resistance modulating unit, ω1For two magnetic conduction pole pieces of outermost layer in each magnetic resistance modulating unit
Width between Wai Ce, ω2And ω3Be respectively the width of magnetic conduction pole piece in each magnetic resistance modulating unit and adjacent two lead
The width of not magnetic inductive block between pole piece, k is positive integer, and meets
ω2< min (ωis_toothtop,ωos_toothtop) (3)
Wherein ωis_toothtopFor inner stator addendum width, ωos_toothtopFor external stator addendum width.K take by formula (1)-
(3) minimum of a value limited.
Beneficial effect: the present invention compares with traditional double generating aid, can be fully achieved the function of brush double feedback electric engine.This
Skilled person knows, the Mechanical Contact between stationary power brush and rotary slip ring is the place being easiest to break down,
And under hyperbaric environment, it is easily generated arc discharge, thus in actual applications, need regular maintenance.The present invention is led to
Cross cancellation electric brush slip ring, improve the reliability of place system, reduce maintenance cost, be that ratio has brush double feedback electric engine to answer
With wider a kind of motor type.
Accompanying drawing explanation
Fig. 1 is the magnetic resistance modulation system Dual-stator brushless double-fed motor schematic cross-section of the present invention;
Fig. 2 is the magnetic resistance modulating unit constituting rotor of the present invention;
Fig. 3 is the rotor pack in process of the present invention.
Figure has: 1 is unshakable in one's determination for external stator, and 2 is external stator winding, and 3 is rotor, and 4 is internal stator iron core, and 5 is interior
Stator winding;31 is not magnetic inductive block, and 32 is magnetic conduction pole piece, the 33 tiny yoke portions being connected for magnetic conduction pole piece.
Detailed description of the invention
The present invention will be further described below in conjunction with the accompanying drawings.
As it is shown in figure 1, the magnetic resistance modulation system Dual-stator brushless double-fed motor of the present invention is interior the most successively
Stator core 4, inner stator winding 5, rotor 3, external stator winding 2 and external stator iron core 1, two described stators
And it is provided with air gap between rotor 3;Described external stator winding 2 number of pole-pairs is 2p, and described inner stator winding 5 is the most right
Number is respectively positive integer for 2q, p and q.From the fundamental property of winding, for make q to pole field p to pole around
Group does not produce induced electromotive force, i.e. two set stator winding not direct-couplings, it is desirable to p and q is unequal;
According to magnetic resistance modulation principle, when the number of rotor magnetic resistance modulating unit is | p ± q | and | p ± q | is when ≠ 0, Ke Yiyu
Q produces the p magnetic-field component to pole to the magnetic fields of pole.The fewest in view of rotor magnetic resistance modulating unit number, single magnetic
The width of resistance modulating unit is the biggest, and the magnetic line of force feelings that one side closes through one layer of air gap the most easily occurs in magnetic conduction region
Shape, therefore select described rotor 3 to be made up of (p+q) individual magnetic resistance modulating unit.Each magnetic resistance modulating unit is along self angle
Bisector is symmetrical, including magnetic conduction region and the not magnetic conduction region on both sides of central authorities.In order to reduce the only office through single air gap
The magnetic flux of portion's Guan Bi, is divided into alternately arranged magnetic conduction pole piece 32 and not magnetic inductive block 31 further by magnetic conduction region.
Magnetic conduction pole piece meets formula (1) with the width ratio of not magnetic inductive block,
Wherein ωsFor the width of single magnetic resistance modulating unit, ω1For two magnetic conduction pole pieces of outermost layer in each magnetic resistance modulating unit
Width between Wai Ce, ω2And ω3Be respectively the width of magnetic conduction pole piece in each magnetic resistance modulating unit and adjacent two lead
The width of not magnetic inductive block between pole piece, k is positive integer;
In order to limit zigzag leakage, it is desirable to the width of single magnetic conduction pole piece meets formula (2)
ω2=2 ω3 (2)
And meet
ω2< min (ωis_toothtop,ωos_toothtop) (3)
Wherein ωis_toothtopFor inner stator addendum width, ωos_toothtopFor external stator addendum width.
Meet at the same time in the k of (1)-(3) and take minimum of a value, to reduce the difficulty of processing of fine size.
Fig. 1 provides one embodiment of the present of invention, wherein p=4, q=2, and rotor has 4+2=6 magnetic resistance modulating unit.
ωis_toothtop=6.70 °, ωos_toothtop=5.24 °, (1)-(3) k > 4.15 can be obtained, therefore take k=5.ω2=4.28 °,
ω3=2.14 °.
Inside and outside stator core is overrided to form by silicon steel laminations, and silicon steel laminations is cut preparation by mould punching or line.
The preparation of rotor is divided into five steps:
(1) cut preparation by mould or line and there is the overall silicon steel laminations in tiny yoke portion;
(2) silicon steel laminations laminates formation baseline rotor iron core vertically, and axial both sides use pressing plate to compress;
(3) baseline rotor iron core puts into mould, in the widest each not magnetic inductive block center arrangement axially through whole
Stainless steel bolt unshakable in one's determination, to increase rotor axial rigidity, then uses poured with epoxy resin;
(4) tiny yoke portion is removed by cutting, then uses without latitude glass tape colligation at excircle, with resist from
Mental and physical efforts.
(5) laminated core is compressed by rotor two ends vertically respectively with two hoops.In axial one end, rotor is by circle
Dish is fixed with rotating shaft;At the other end of axle, rotor supports is got up through bearing by another disk.
The rotating speed n of this brushless dual-feed motorrWith frequency f of electric current in two stator windingpAnd fqMeet relation:
Rotating speed formula is similar with double feedback electric engine, difference be to have the number of pole-pairs of brush double feedback electric engine and a set of stator around
The number of pole-pairs of group is identical, and the number of pole-pairs of the Dual-stator brushless double-fed motor that the present invention proposes is that two set stator winding are the most right
Number sum.From formula (4), motor speed is together decided on by electric frequency and the number of pole-pairs of two set stator winding, logical
Cross and change the electric frequency of a set of winding or double winding and just can realize motor speed regulation flexibly.The employing present invention proposes
Structure obtain advantage be:
(1) owing to there is two-layer air gap on magnetic circuit, degree of saturation is less than two kinds of existing single stator structures, goes brushization
While keep the power density of double feedback electric engine to be basically unchanged;
(2) number of pole-pairs different two set stator winding embed respectively in inside and outside stator core, reduce embed around
The difficulty of group, improves slot space utilization rate.
Claims (2)
1. a magnetic resistance modulation system Dual-stator brushless double-fed motor, including external stator, inner stator and be placed in described external stator
And the rotor between inner stator, described external stator, rotor and inner stator concentric and separate, external stator and rotor it
Between be provided with outer air gap, be provided with interior air gap between rotor and inner stator, it is characterised in that: described external stator includes external stator
Unshakable in one's determination (1) and external stator winding (2) that number of pole-pairs is 2p in embedding stator coring groove outside;Described inner stator includes
Internal stator iron core (4) and inner stator winding (5) that number of pole-pairs is 2q embedded in internal stator iron core groove, wherein p and
Q is respectively positive integer, and p with q is unequal;Described rotor (3) is made up of, often (p+q) individual magnetic resistance modulating unit
Individual magnetic resistance modulating unit is symmetrical along self angular bisector, including magnetic conduction region and the not magnetic conduction region on both sides, the magnetic conduction of central authorities
Region by alternately arranged magnetic conduction pole piece (32) and not magnetic inductive block (31) constitute, the width of magnetic conduction pole piece and not magnetic inductive block
Ratio meets:
ω2=2 ω3 (2)
Wherein ωsFor the width of single magnetic resistance modulating unit, ω1For two leading pole off-chips of outermost layer in each magnetic resistance modulating unit
Width between side, ω2And ω3It is respectively the width of magnetic conduction pole piece in each magnetic resistance modulating unit and adjacent two leading poles
The width of not magnetic inductive block between sheet, k is positive integer, and meets
ω2< min (ωis_toothtop,ωos_toothtop) (3)
Wherein ωis_toothtopFor inner stator addendum width, ωos_toothtopFor external stator addendum width.
A kind of magnetic resistance modulation system Dual-stator brushless double-fed motor the most according to claim 1, it is characterised in that: k takes
The minimum of a value limited by formula (1)-(3).
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Families Citing this family (8)
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CN106160379A (en) * | 2015-03-26 | 2016-11-23 | 香港理工大学 | Flux modulation bimorph transducer double electricity port motor |
CN105914978B (en) * | 2016-04-18 | 2018-09-28 | 合肥工业大学 | A kind of Dual-stator brushless double-fed motor |
CN106026578A (en) * | 2016-07-27 | 2016-10-12 | 东南大学 | Reluctance rotor field modulation double-stator brushless doubly-fed motor |
CN106487179A (en) * | 2016-11-07 | 2017-03-08 | 东南大学 | Dual-stator brushless double-fed wind power generator is modulated in a kind of field |
CN106787545B (en) * | 2017-01-05 | 2019-06-25 | 东南大学 | A kind of double-stator magneto resistance brushless wind generator of three electrical ports |
CN107834796A (en) * | 2017-09-21 | 2018-03-23 | 哈尔滨理工大学 | A kind of magnetic flux memory formula magnetic gear compound machine |
CN108494200A (en) * | 2018-05-21 | 2018-09-04 | 广东上水能源科技有限公司 | A kind of brushless dual-feed motor wound rotor and its manufacture craft |
CN113890226A (en) * | 2021-09-30 | 2022-01-04 | 东南大学 | Modulation unit of rotor, salient pole rotor, motor and method for reducing magnetic leakage of motor |
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CN201341075Y (en) * | 2008-10-30 | 2009-11-04 | 东明机电(深圳)有限公司 | Double-stator brushless DC motor |
CN101764491A (en) * | 2008-12-24 | 2010-06-30 | 徐隆亚 | Megawatt grade brushless slip ring double-fed wind generator/motor and control method thereof |
CN202435219U (en) * | 2012-01-19 | 2012-09-12 | 东南大学 | Brushless double-fed motor |
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JP2011072173A (en) * | 2009-08-27 | 2011-04-07 | Kura Gijutsu Kenkyusho:Kk | Magnetic flux amount variable rotary electric machine system |
JP5265799B1 (en) * | 2012-08-03 | 2013-08-14 | 有限会社クラ技術研究所 | Magnet excitation rotating electrical machine system |
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CN201341075Y (en) * | 2008-10-30 | 2009-11-04 | 东明机电(深圳)有限公司 | Double-stator brushless DC motor |
CN101764491A (en) * | 2008-12-24 | 2010-06-30 | 徐隆亚 | Megawatt grade brushless slip ring double-fed wind generator/motor and control method thereof |
CN202435219U (en) * | 2012-01-19 | 2012-09-12 | 东南大学 | Brushless double-fed motor |
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Application publication date: 20141008 Assignee: Jiangsu Weiteli motor Limited by Share Ltd Assignor: Southeast University Contract record no.: 2018320000016 Denomination of invention: Magnetic resistance modulation type double-stator brushless double-fed motor Granted publication date: 20160831 License type: Exclusive License Record date: 20180123 |