CN104092342A - Magnetic resistance modulation type double-stator brushless double-fed motor - Google Patents

Magnetic resistance modulation type double-stator brushless double-fed motor Download PDF

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Publication number
CN104092342A
CN104092342A CN201410357208.9A CN201410357208A CN104092342A CN 104092342 A CN104092342 A CN 104092342A CN 201410357208 A CN201410357208 A CN 201410357208A CN 104092342 A CN104092342 A CN 104092342A
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China
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stator
rotor
magnetic
magnetic resistance
double
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CN201410357208.9A
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Chinese (zh)
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CN104092342B (en
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程明
韩鹏
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东南大学
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Abstract

The invention discloses a magnetic resistance modulation type double-stator brushless double-fed motor. The magnetic resistance modulation type double-stator brushless double-fed motor comprises an outer stator, an inner stator and a rotor arranged between the outer stator and the inner stator. The outer stator, the rotor and the inner stator are coaxial and independent from one another. An outer air gap is formed between the outer stator and the rotor. An inner air gap is formed between the rotor and the inner stator. The outer stator comprises an outer stator iron core and 2p pole pairs of outer stator windings embedded and placed in an outer stator iron core groove. The inner stator comprises an inner stator iron core and 2q pole pairs of inner stator windings embedded and placed in an inner stator iron core groove, wherein p and q are positive integers respectively and are not equal. The rotor is composed of (p+q) magnetic resistance modulation units, and each magnetic resistance modulation unit is composed of permeability pole pieces and non-permeability blocks, all of which are arranged alternately. According to the double-fed motor, due to the fact that the two layers of air gaps exist in a magnetic circuit, the saturation degree is lower than that of two existing single-stator structures, and the power density of the double-fed motor is kept basically unchanged during brushless processing.

Description

A kind of magnetic resistance modulation system Dual-stator brushless double-fed motor
Technical field
The present invention relates to a kind of magnetic resistance modulation system Dual-stator brushless double-fed motor, be applicable to frequency control occasion, the present invention relates to motor, mechanical field.
Background technology
Traditional double generating aid is wound rotor asynchronous machine, and rotor winding, with rotor, must be used electric brush slip ring that the electric current and voltage in rotation winding is drawn with conduction pattern.Thereby make double feedback electric engine have two electric ports, a mechanical port, has good frequency control performance, in megawatt level wind power generation system and high-grade drives, is widely used.But the existence of electric brush slip ring causes motor poor reliability, and maintenance cost is high.Have the brushization of going of brush double feedback electric engine is the focus that people study always.
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 coaxial cascades of wound asynchronous motor form, and its axial length is long, is difficult to be subject in space the application scenario use of strict restriction.Patent CN200510047247.X discloses a kind of pair of stator, single rotor disc brushless double-fed alternating current machine, and two stators and a rotor arrange vertically, and rotor is positioned in the middle of two stators.Two stator cores, all near rotor-side one-side gaining, embed respectively the 2p utmost point and 2q utmost point three-phase symmetrical stator winding, and two cover stator winding are separate.Rotor core double surface grooving embeds respectively 2p and 2q utmost point three-phase symmetrical rotor winding, and two cover rotor windings are connected to form a set of rotor winding with phase sequence or negative-phase sequence.This structure makes two radial flux asynchronous machines of axial cascade into two axial magnetic flux asynchronous machines of axial cascade, can realize the dual feeding synchronous operation of expectation, but only when p=q and two cover three-phase symmetrical rotor winding negative-phase sequences are connected to form a set of rotor winding, just can reach the torque rotor volume ratio identical with there being brush double feedback electric engine.When p ≠ q, inside and outside two-layer air gap electromagnetic load can not be got higher value simultaneously, and its torque volume ratio is about 0.75 times of brush double feedback electric engine.
Nested rings rotator type and reluctance rotor formula are single stator structure, and the two cover stator winding that number of pole-pairs is different share a stator core, and therefore, the electromagnetic load of single number of pole-pairs is restricted, and torque volume ratio is also about 0.75 times of brush double feedback electric engine.
In order to improve the power density (power to volume ratio) of existing brushless dual-feed motor, patent CN201220025540.1 proposes the Dual-stator brushless double-fed motor structure that a kind of radial concentric is arranged.The rotor of this motor adopts inside and outside double-deck mouse cage winding, and in a rotor side axially, inside and outside layer mouse cage sliver connects with two separate public end ring respectively; Rotor axially opposite side, inside and outside layer mouse cage sliver is the direction of motion phase inverse correspondence connection with respect to rotor itself according to the rotating magnetic field that produced separately.Thereby make steady-state speed meet n r=60 (f p± f q)/(p+q), realizes dual feeding synchronous operation.The inside and outside layer of this structural requirement rotor sliver number is identical, and groove number is identical.Owing to only having circuit to connect between the inside and outside layer of Dual-stator brushless double-fed motor rotor iron core, without magnetic circuit coupling, ectonexine rotor core all should leave enough yoke portion thickness to avoid rotor core saturated in advance.Rotor is increased along the thickness of radial direction, and with a p=4, the Dual-stator brushless double-fed motor of q=2 is example, and external diameter can reach 2:1 with the ratio of internal diameter.If still according to the Dual-stator brushless double-fed motor rotor structure of previous design, internal and external circumference fluting number is identical, certainly will cause that internal layer air gap electric loading is outer air gap 2 times, internal layer air gap magnetic loading is outer air gap 2 times.Due to the saturated restriction of internal stator iron core, the electromagnetic load of external stator iron core is significantly lower than internal stator, and then exerting oneself of motor unit volume is restricted.In summary, existing brushless dual-feed motor has reduced the power density (approximately reducing 25%) that has brush double feedback electric engine in non-brushing.
Summary of the invention
Technical problem: the present invention is directed to the problem that traditional double generating aid exists electric brush slip ring, operation logic from double feedback electric engine, internal stator and magnetic resistance modulation rotor are equivalent to a wound rotor, a kind of magnetic resistance modulation system Dual-stator brushless double-fed motor is proposed, thereby on the basis of realizing traditional double generating aid function completely, cancel electric brush slip ring, keep the power density close with there being brush double feedback electric engine simultaneously.
Technical scheme: for solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of magnetic resistance modulation system Dual-stator brushless double-fed motor, comprise external stator, internal stator and be placed in the rotor between described external stator and internal stator, described external stator, rotor and internal stator concentric and separate, between external stator and rotor, be provided with outer air gap, between rotor and internal stator, be provided with interior air gap and it is characterized in that:
Described external stator comprises that external stator is unshakable in one's determination and embeds the external stator winding that the number of pole-pairs in stator coring groove is outside 2p; Described internal stator comprises internal stator iron core and embed the internal stator winding that the number of pole-pairs in internal stator iron core groove is 2q, and wherein p and q are respectively positive integer, and p and q unequal;
Described rotor consists of (p+q) individual magnetic resistance modulating unit, and each magnetic resistance modulating unit is symmetrical along self angular bisector, by the magnetic conduction pole piece of alternative arrangement and not magnetic inductive block form, magnetic conduction pole piece is satisfied with the width ratio of magnetic inductive block not:
kω 2 + ( k - 1 ) ω 3 = ω 1 = 1 2 ω s - - - ( 1 )
ω 2=2ω 3????(2)
ω wherein sfor the width of single magnetic resistance modulating unit, ω 1for the width between two magnetic conduction pole piece outsides of outermost layer in each magnetic resistance modulating unit, ω 2and ω 3be respectively between the width of magnetic conduction pole piece in each magnetic resistance modulating unit and adjacent two magnetic conduction pole pieces the not width of magnetic inductive block, k is positive integer, and meets
ω 2<min(ω is_toothtopos_toothtop)????(3)
ω wherein is_toothtopfor internal stator addendum width, ω os_toothtopfor external stator addendum width.K gets the minimum value by formula (1)-(3) limit.
Beneficial effect: the present invention compares with traditional double generating aid, can realize the function of brushing double feedback electric engine completely.One skilled in the art will appreciate that the Mechanical Contact between static brush and rotary slip ring is the place of the most easily breaking down, and easily produce arc discharge under hyperbaric environment, thereby in actual applications, need regular maintenance.The present invention, by cancelling electric brush slip ring, has improved the reliability of place system, has reduced maintenance cost, is than there being the wider a kind of motor type of brush double feedback electric engine range of application.
Accompanying drawing explanation
Fig. 1 is magnetic resistance modulation system Dual-stator brushless double-fed motor schematic cross-section of the present invention;
Fig. 2 is for forming a magnetic resistance modulating unit of rotor of the present invention;
Fig. 3 is the rotor pack in the course of processing of the present invention.
In figure, have: 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 internal stator winding; 31 is magnetic inductive block not, and 32 is magnetic conduction pole piece, the 33 tiny yoke portions that are connected for magnetic conduction pole piece.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
As shown in Figure 1, magnetic resistance modulation system Dual-stator brushless double-fed motor of the present invention is radially internal stator iron core 4, internal stator winding 5 from inside to outside successively, rotor 3, external stator winding 2 and external stator iron core 1, be provided with air gap between described two stators and rotor 3; Described external stator winding 2 numbers of pole-pairs are 2p, and described internal stator winding 5 numbers of pole-pairs are 2q, and p and q are respectively positive integer.From the fundamental property of winding, for making q not produce induced electromotive force at p in to utmost point winding to pole field, two cover stator winding direct-coupling not, requires p and q unequal;
According to magnetic resistance modulation principle, when the number of rotor magnetic resistance modulating unit is | p ± q| and | during p ± q| ≠ 0, can to the magnetic fields of the utmost point, produce the magnetic-field component of p to the utmost point with q.Consider that rotor magnetic resistance modulating unit number is fewer, the width of single magnetic resistance modulating unit is larger, and the situation of one-sided closure more easily appears the magnetic line of force through one deck air gap and in magnetic conduction region, therefore select described rotor 3 to consist of (p+q) individual magnetic resistance modulating unit.Each magnetic resistance modulating unit, along self angular bisector symmetry, comprises the not magnetic conduction region on central magnetic conduction region and both sides.The local closed magnetic flux in order only to reduce through single air gap, is further divided into magnetic conduction region the magnetic conduction pole piece 32 of alternative arrangement and magnetic inductive block 31 not.Magnetic conduction pole piece and the not width ratio of magnetic inductive block meet formula (1),
kω 2 + ( k - 1 ) ω 3 = ω 1 = 1 2 ω s - - - ( 1 )
ω wherein sfor the width of single magnetic resistance modulating unit, ω 1for the width between two magnetic conduction pole piece outsides of outermost layer in each magnetic resistance modulating unit, ω 2and ω 3be respectively between the width of magnetic conduction pole piece in each magnetic resistance modulating unit and adjacent two magnetic conduction pole pieces the not width of magnetic inductive block, k is positive integer;
In order to limit zigzag leakage, require the width of single magnetic conduction pole piece to meet formula (2)
ω 2=2ω 3????(2)
And meet
ω 2<min(ω is_toothtopos_toothtop)????(3)
ω wherein is_toothtopfor internal stator addendum width, ω os_toothtopfor external stator addendum width.
In the k of satisfied (1)-(3), get minimum value at the same time, to reduce the difficulty of processing of fine size.
Fig. 1 provides one embodiment of the present of invention, p=4 wherein, and q=2, has 4+2=6 magnetic resistance modulating unit on rotor.ω is_toothtop=6.70 °, ω os_toothtop=5.24 °, by (1)-(3), can obtain k>4.15, therefore get k=5.ω 2=4.28°,ω 3=2.14°。
Inside and outside stator core is overrided to form by silicon steel laminations, and silicon steel laminations is by mould punching or line cutting preparation.
The preparation of rotor is divided into five steps:
(1) by mould or line cutting preparation, there is the whole silicon steel laminations of tiny yoke portion;
(2) silicon steel laminations laminates vertically and forms original rotor core, and axially both sides are used pressing plate to compress;
(3) original rotor core is put into mould, runs through vertically the stainless steel bolt of whole iron core in each the widest not magnetic inductive block center arrangement, to increase rotor axial rigidity, then uses poured with epoxy resin;
(4) tiny yoke portion is removed by cutting, then use without the colligation of latitude glass tape, to resist centrifugal force at excircle.
(5) rotor compresses laminated core with two hoops respectively at two ends vertically.In axial one end, rotor is fixed by disk and rotating shaft; At the other end of axle, by another disk, through bearing, rotor supports is got up.
The rotation speed n of this brushless dual-feed motor rfrequency f with electric current in two stator winding pand f qmeet relation:
n r = 60 ( f p - f q ) p + q - - - ( 4 )
Rotating speed formula and double feedback electric engine similar, difference is that the brush number of pole-pairs of double feedback electric engine is identical with the number of pole-pairs of a set of stator winding, and the number of pole-pairs of the Dual-stator brushless double-fed motor of the present invention's proposition is two cover stator winding number of pole-pairs sums.From formula (4), motor speed determines jointly by electric frequency and the number of pole-pairs of two cover stator winding, by changing the electric frequency of a set of winding or double winding, just can realize flexibly motor speed and regulates.The advantage that the structure that adopts the present invention to propose obtains is:
(1), owing to there being two-layer air gap on magnetic circuit, degree of saturation, lower than two kinds of existing single stator structures, keeps the power density of double feedback electric engine substantially constant when going brushization;
(2) the two cover stator winding that number of pole-pairs is different embed respectively in inside and outside stator core, have reduced to embed the difficulty of winding, have improved slot space utilance.

Claims (2)

1. a magnetic resistance modulation system Dual-stator brushless double-fed motor, comprise external stator, internal stator and be placed in the rotor between described external stator and internal stator, described external stator, rotor and internal stator concentric and separate, between external stator and rotor, be provided with outer air gap, between rotor and internal stator, be provided with interior air gap and it is characterized in that: described external stator comprises external stator unshakable in one's determination (1) and embeds the external stator winding (2) that the number of pole-pairs in stator coring groove is outside 2p; Described internal stator comprises internal stator iron core (4) and embeds the internal stator winding (5) that the number of pole-pairs in internal stator iron core groove is 2q, and wherein p and q are respectively positive integer, and p and q unequal; Described rotor (3) consists of (p+q) individual magnetic resistance modulating unit, each magnetic resistance modulating unit is along self angular bisector symmetry, by the magnetic conduction pole piece (32) of alternative arrangement and not magnetic inductive block (31) form, magnetic conduction pole piece meets with the width ratio of magnetic inductive block not:
kω 2 + ( k - 1 ) ω 3 = ω 1 = 1 2 ω s - - - ( 1 )
ω 2=2ω 3????(2)
ω wherein sfor the width of single magnetic resistance modulating unit, ω 1for the width between two magnetic conduction pole piece outsides of outermost layer in each magnetic resistance modulating unit, ω 2and ω 3be respectively between the width of magnetic conduction pole piece in each magnetic resistance modulating unit and adjacent two magnetic conduction pole pieces the not width of magnetic inductive block, k is positive integer, and meets
ω 2<min(ω is_toothtopos_toothtop)????(3)
ω wherein is_toothtopfor internal stator addendum width, ω os_toothtopfor external stator addendum width.
2. a kind of magnetic resistance modulation system Dual-stator brushless double-fed motor according to claim 1, is characterized in that: k gets the minimum value by formula (1)-(3) limit.
CN201410357208.9A 2014-07-24 2014-07-24 A kind of magnetic resistance modulation system Dual-stator brushless double-fed motor CN104092342B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105914978A (en) * 2016-04-18 2016-08-31 合肥工业大学 Double-stator brushless double-feed motor
CN106026578A (en) * 2016-07-27 2016-10-12 东南大学 Reluctance rotor field modulation double-stator brushless doubly-fed motor
CN106160379A (en) * 2015-03-26 2016-11-23 香港理工大学 Flux modulation bimorph transducer double electricity port 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
CN106787545A (en) * 2017-01-05 2017-05-31 东南大学 A kind of double-stator magneto resistance brushless wind generator of three electrical ports

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JP2011072173A (en) * 2009-08-27 2011-04-07 Kura Gijutsu Kenkyusho:Kk Magnetic flux amount variable rotary electric machine system
CN202435219U (en) * 2012-01-19 2012-09-12 东南大学 Brushless double-fed motor
JP2014033537A (en) * 2012-08-03 2014-02-20 Kura Gijutsu Kenkyusho:Kk Magnet excitation rotary electric machine system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JP2011072173A (en) * 2009-08-27 2011-04-07 Kura Gijutsu Kenkyusho:Kk Magnetic flux amount variable rotary electric machine system
CN202435219U (en) * 2012-01-19 2012-09-12 东南大学 Brushless double-fed motor
JP2014033537A (en) * 2012-08-03 2014-02-20 Kura Gijutsu Kenkyusho:Kk Magnet excitation rotary electric machine system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106160379A (en) * 2015-03-26 2016-11-23 香港理工大学 Flux modulation bimorph transducer double electricity port motor
CN105914978A (en) * 2016-04-18 2016-08-31 合肥工业大学 Double-stator brushless double-feed 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
CN106787545A (en) * 2017-01-05 2017-05-31 东南大学 A kind of double-stator magneto resistance brushless wind generator of three electrical ports
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

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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