CN102545502A - Dual-stator brushless double-fed motor - Google Patents
Dual-stator brushless double-fed motor Download PDFInfo
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- CN102545502A CN102545502A CN2012100173251A CN201210017325A CN102545502A CN 102545502 A CN102545502 A CN 102545502A CN 2012100173251 A CN2012100173251 A CN 2012100173251A CN 201210017325 A CN201210017325 A CN 201210017325A CN 102545502 A CN102545502 A CN 102545502A
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Abstract
The invention discloses a dual-stator brushless double-fed motor. The motor comprises an outer stator, a rotor, an inner stator and a bidirectional rectification inverter, wherein a 2p-pole stator winding on the outer stator is a power winding directly connected with a power grid; a 2q-pole stator winding on the inner stator is a control winding connected with the power grid through the bidirectional rectification inverter; the rotor is provided with two layers of squirrel cages; guide strips of the two layers of squirrel cages are correspondingly connected at one end of the rotor; and the guide strips of the two layers of squirrel cages are respectively short-circuited through two end rings at the other end of the rotor. The dual-stator brushless double-fed motor has excellent adaptability, can be designed into not only a variable-speed constant-frequency generator but also a constant-frequency adjustable-speed motor, has a simple and compact structure, is high in power density, and has high reliability and low operation and maintenance costs due to omission of a brush slip ring.
Description
Technical field
The invention belongs to motor and control technology field thereof, relate to a kind of doubly-fed variable-speed constant-frequency electric generator/electric motor.
Background technology
Along with the whole society to the giving more sustained attention of the energy and environmental problem, the development and use of regenerative resource are just demonstrating the trend of accelerated development.Wind energy extensively exists on earth and is is one of the most ripe regenerative resource that people grasped at present.Wind-driven generator is the device that in the wind generator system mechanical energy is converted into electric energy, and its performance directly affects the quality and the conversion efficiency of output electric energy.
At present, the generator of popular in the world high-power wind power generation system use mainly has following several types:
One, dual-feed asynchronous wind power generator
Use gear box that lower rotation speed of fan is transformed to higher generator operation speed in the double-fed asynchronous wind generator system, the continuously variable operation, wind power conversion efficiency is high.Power inverter is part power inverter (is about whole power 1/3rd), thereby the converter cost is relatively low.Its shortcoming is that motor has brush and slip ring, makes reliability decrease, makes and the maintenance cost increase.In addition, the existence of gear box has increased system bulk, and system reliability is further reduced.
Two, direct-drive type synchronous generator
The direct-drive type synchronous generator is directly driven by blower fan, thereby does not need gear box, has improved the reliability of whole system to a certain extent.The direct-drive type synchronous generator comprises electromagnetic type and magneto.The direct-driving electric excitation synchronous generator is supplied power by outside field power supply, thereby still has brush and slip ring.The direct drive permanent magnetic synchronous generator has been cancelled brush and slip ring by the permanent-magnet steel excitation.Two kinds of motors all run on than the slow-speed of revolution, and motor pole number is increased, and it is big that volume becomes.Simultaneously, direct-drive type synchronous generator system all uses the total power converter, thereby the converter cost is higher.In addition, possible permanent magnet demagnetization also is the problem that the direct drive permanent magnetic synchronous generator faces.
Three, brushless dual-feed motor
The brushless dual-feed motor stator side has the different independent winding of two cover numbers of pole-pairs, and rotor adopts closed voluntarily loop structure, and two cover stator winding are full decoupled on circuit and magnetic circuit, cancelled brush and slip ring, and reliability improves.Use the part power inverter, the converter cost is lower.Brushless dual-feed motor is according to whether shared stator core can be divided into axial tandem type and shared stator core formula.Axially the tandem type brushless dual-feed motor is formed by the axial cascade of two asynchronous motors; One is the power machine; Another is a controller, must leave certain spacing because the existence of winding overhang makes between two stators of axial cascade, and the common rotor utilance is low; System takes up room greatly, and power density is on the low side.Shared stator core formula brushless dual-feed motor has only a stator core, lays the different winding of two cover numbers of pole-pairs above, and a cover is the power winding; Another set of for controlling winding; Winding construction is complicated, and the groove utilance is on the low side, and has direct magnetic coupling between two cover windings.Simultaneously, the cage rotor structure of use is special, needs specialized designs.
Summary of the invention
Technical problem:The object of the present invention is to provide a kind of dual-stator brushless double feedback electric engine that improves system reliability and space availability ratio.
Technical scheme:Dual-stator brushless double feedback electric engine of the present invention comprises bidirectional rectifying inverter, end cap, rotating shaft, internal stator, around the rotor of said internal stator, the external stator of surrounding rotor; Be connected through bearing between rotating shaft and the end cap; One end of rotor is connected with rotating shaft, is provided with air gap between two stators and the rotor; External stator comprise external stator unshakable in one's determination be arranged on that number of poles is the external stator winding of 2p on the said external stator iron core; Internal stator comprises internal stator iron core and is arranged on that number of poles is the internal stator winding of 2q on the said internal stator iron core; Said p and q are respectively positive integer, and p and q are unequal; The three-phase lead-out wire of external stator winding links to each other with electrical network or main power source; The three-phase lead-out wire of internal stator winding is connected with said bidirectional rectifying inverter; Rotor is provided with the winding of double-deck cage-shaped structure, connects between the two-layer mouse cage winding.
Among the present invention, rotor comprises the mechanical support of round barrel shape, and the bucket wall medial and lateral of mechanical support are respectively arranged with the unshakable in one's determination and outer iron core of internal layer, and the internal layer iron core is provided with the internal layer mouse cage, and outer iron core is provided with outer mouse cage; The internal layer mouse cage comprises along internal layer circumferential array unshakable in one's determination, is parallel to axial interior sliver; Said outer mouse cage comprise along outer mouse cage circumferential array, be parallel to axially and with said in the outer sliver of the corresponding setting of sliver, interior sliver is connected with the end of pairing outer sliver at rotor; End ring and outer end ring in the other end of rotor is provided with, said interior end ring is connected with interior sliver, and said outer end ring is connected with outer sliver.
Among the present invention, external stator winding and internal stator winding are heterogeneous symmetrical stator winding.
Beneficial effect:The present invention compares with prior art, has the following advantages:
This brushless dual-feed motor has kept the advantage of direct-drive type synchronous generator, dual-feed asynchronous wind power generator, has cancelled brush and slip ring, has improved system reliability, has reduced maintenance cost.Flow through power inverter electrical power for control winding power, the common double-fed asynchronous generator of analogy can know that the power inverter capacity is less, is about 1/3 of the whole power of motor, thereby the power inverter cost is low.
Compare with the tandem type brushless dual-feed motor; Owing to adopt the double-stator structure of external stator and internal stator arranged concentric; Make motor integral body under the identical situation of power output; Axial length is reduced to original half the approximately, thereby structure is compact more, has improved the space availability ratio and the power density of motor greatly.
Compare with shared stator core formula brushless dual-feed motor, separate by cup-shaped rotor between two stators, inside and outside the at one end corresponding sliver of two-layer mouse cage link to each other, make and have only circuit to connect between the double-deck mouse cage.The magnetic field that the magnetic field that the power winding produces and control winding produce is only through the rotor INDIRECT COUPLING, and control is convenient in the direct coupling that possibly exist between two stator fields when having eliminated shared stator core.Simultaneously, rotor uses the cage-shaped structure of similar common induction machine, and technical maturity make simply, and the mouse cage winding of shared stator core formula brushless dual-feed motor needs particular design to satisfy the requirement of electromagnetic performance.
Description of drawings
Fig. 1 is a dual-stator brushless double-fed wind power generator system principle sketch map of the present invention;
Fig. 2 partly cuts open sketch map for dual-stator brushless double feedback electric engine of the present invention;
Fig. 3 is a dual-stator brushless double feedback electric engine shaft section sketch map of the present invention;
Fig. 4 is a dual-stator brushless double feedback electric engine outer stator structure sketch map of the present invention;
Fig. 5 is a dual-stator brushless double feedback electric engine internal stator structural representation of the present invention;
Fig. 6 is a dual-stator brushless double feedback electric engine cage rotor structural representation of the present invention, and half rotor only draws among the figure;
Fig. 7 is a dual-stator brushless double feedback electric engine cage rotor shaft section sketch map of the present invention;
Fig. 8 is a dual-stator brushless double fed electric machine rotor cage-shaped structure sketch map of the present invention, and two slivers only draw among the figure;
Fig. 9 is a dual-stator brushless double fed electric machine rotor mechanical support structure sketch map of the present invention, half of the mechanical support of only drawing among the figure;
Figure 10 makes vscf generator or motor operation logic sketch map for this dual-stator brushless double feedback electric engine of inventing is connected to electrical network.
Have among the figure: 1 is external stator, and 2 is internal stator, and 3 is rotor, and 4 is bidirectional power converter, and 5 is gear box, and 6 is the blower fan wind wheel, and 7 is end cap, and 8 is bearing, and 9 are rotating shaft, and 10 is filter inductance.11 is that external stator is unshakable in one's determination, and 12 is the external stator winding, and 13 is the external stator tooth, and 14 is the external stator groove, and 21 is internal stator iron core; 22 is the internal stator winding, and 23 is the internal stator tooth, and 24 is pilot trench decided at the higher level but not officially announced, and 31 is that rotor inner layer is unshakable in one's determination; 32 is that rotor outer layer is unshakable in one's determination, and 33 is outer mouse cage, and 34 for rotor mechanical supports, and 35 is the internal layer mouse cage; 331 is outer sliver, and 351 is interior sliver, and 332 is outer end ring, and 352 is interior end ring.
Embodiment
Below in conjunction with accompanying drawing the present invention is further specified.
Dual-stator brushless double feedback electric engine of the present invention comprises bidirectional rectifying inverter 4, end cap 7, rotating shaft 9, internal stator 2, around the rotor 3 of said internal stator 2, the external stator 1 of surrounding rotor 3; Be connected through bearing 8 between rotating shaft 9 and the end cap 7; One end of rotor 3 is connected with rotating shaft 9, is provided with air gap between two stators and the rotor 3; External stator 1 comprises external stator unshakable in one's determination 11 and is arranged on that number of poles is the external stator winding 12 of 2p on the said external stator unshakable in one's determination 11; Internal stator 2 comprises internal stator iron core 21 and is arranged on that number of poles is the internal stator winding 22 of 2q on the said internal stator iron core 21; External stator winding 12 is heterogeneous symmetrical stator winding with internal stator winding 22; P and q are respectively positive integer, and p and q are unequal; The three-phase lead-out wire of external stator winding 11 links to each other with electrical network or main power source; The three-phase lead-out wire of internal stator winding 22 is connected with said bidirectional rectifying inverter 4; Rotor 3 is provided with the winding of double-deck cage-shaped structure, connects between the two-layer mouse cage winding.
Fig. 1 is this dual-stator brushless double-fed wind power generator system, and this motor comprises bidirectional rectifying inverter 4, end cap 7, rotating shaft 9, internal stator 2, around the rotor 3 of said internal stator 2, the external stator 1 of surrounding rotor 3.It is the external stator winding 12 of 2p that one cover number of poles is wherein arranged on the external stator 1, and it is the internal stator winding 22 of 2q that a cover number of poles is arranged on the internal stator 2, and wherein p and q are respectively positive integer.External stator winding 12 is main power winding, directly is connected with electrical network or main power source; Internal stator winding 22 is connected with electrical network or external circuit through bidirectional power converter 4 for the control winding.Above-mentioned 2p stator winding 12 is heterogeneous symmetrical stator winding with 2q stator winding 22.
Rotor is provided with the winding of two-layer cage-shaped structure; Outer sliver 331 is identical with interior sliver 332 numbers; The sliver of two-layer mouse cage directly links to each other at an end of rotor, and at the other end of rotor, outer end ring 332 connects the sliver 331 of outer mouse cage; Interior end ring 352 connects the sliver 351 of internal layer mouse cage, and outer end ring 332 and interior end ring 352 are independently of one another.Rotor directly or through gear box 5 indirectly and blower fan wind wheel 6 set up mechanical connection.
This dual-stator brushless double feedback electric engine can be divided into two kinds of structures of radial and axial magnetic flux distribution according to the magnetic flux distribution direction.Magnetic flux forms the closed-loop path of magnetic flux along the radial direction radiation in the radial flux distribution structure in perpendicular to the plane of axle.Magnetic flux and shaft parallel in the axial magnetic flux distributed architecture, the closed-loop path of formation magnetic flux in the plane that is parallel to axle.
As shown in Figures 2 and 3, two stators and rotor arrange that radially external stator 1 places rotor 3 outsides, and internal stator 2 places rotor 3 inboards, the mechanical axis coinciding of stator and rotor.One end of rotor 3 is connected with rotating shaft 9, is connected through bearing 8 between external stator 1, rotating shaft 9 and the end cap 7, is provided with air gap between two stators and the rotor 3, realizes this electric power generation or electronic function thereby the air gap between stator and rotor transmits electromagnetic torque.
Like Fig. 4 and shown in Figure 5, external stator 1 comprises external stator unshakable in one's determination 11 and is arranged on that number of poles is the external stator winding 12 of 2p on the external stator unshakable in one's determination 11, and internal stator 2 comprises internal stator iron core 21 and is arranged on that number of poles is the internal stator winding of 2q on the internal stator iron core 21.Stator core is overrided to form by the stator punching based on the double-sided insulation electrical sheet, at the equally distributed teeth groove of stator surface difference punching out towards rotor.
The effect of stator tooth is a magnetic conduction, and the effect of groove is to lay winding.The external stator winding is the power winding, and its electric current and voltage are higher, directly links to each other with electrical network, as first feed port of double feedback electric engine.The internal stator winding is the control winding, and its voltage and current is less, links to each other indirectly with electrical network through bidirectional rectifying inverter, as second feed port of double feedback electric engine.
Fig. 6 and Fig. 7 are the rotor 3 of this dual-stator brushless double feedback electric engine, comprise the mechanical support 34 of round barrel shape, the internal layer unshakable in one's determination 31 that is positioned at 34 barrels of wall medial and lateral of mechanical support and outer iron core 32, be arranged on internal layer mouse cage 35 and outer mouse cage 33 on the ectonexine iron core.Iron core is overrided to form by the rotor punching based on the double-sided insulation electrical sheet, and dashing in the punching has equally distributed hole, is used to place the mouse cage sliver.On the mechanical support 34 in the middle of rotor inner layer unshakable in one's determination 31 is fixed in outer unshakable in one's determination 32.
Fig. 8 is the part of cage-shaped structure, and the internal layer mouse cage comprises along internal layer 31 circumferential array unshakable in one's determination, is parallel to axial interior sliver 351, outer mouse cage comprise along outer mouse cage 33 circumferential array, be parallel to axially and with the outer sliver 331 of interior sliver 351 corresponding settings.Interior sliver 351 connects at an end of rotor with corresponding outer sliver 331, forms U-shaped; In the other end of rotor is provided with end ring 352 with outside end ring 332, interior end ring 352 is connected with interior sliver 351, outer end ring 332 is connected with outer sliver 331.Double-deck mouse cage can equivalence be a folded single-layer mouse cage.Mouse cage can be welded with sliver, also can use the method manufacturing of cast aluminium.
The rotation speed n of this brushless dual-feed motor
rFrequency f with electric current in two stator winding
pAnd f
qSatisfy relation: n
r=60 (f
p± f
q)/(p+q).As mains frequency f
pIn the time of fixedly, regulate the frequency f of electric current in the internal stator winding
q, just can realize the variable-speed operation of this brushless dual-feed motor.Adopt certain control method, frequency, size and phase place through the control bidirectional rectifying inverter is regulated electric current in the control winding not only can produce the electric energy of constant frequency and constant voltage, and can realize the flexible of active power and reactive power.
Control method as the vscf generator operation; In the dual-stator brushless double feedback electric engine of the present invention; The external stator winding directly is connected with electrical network, and the internal stator winding links to each other with electrical network through rectification adverser, when generator power shaft rotating speed changes; Through the frequency and the amplitude of rectification adverser control 2q utmost point winding current, make the alternating current of 2p utmost point power winding output constant frequency and constant voltage.
Control method as the operation of variable speed constant frequency motor; In the dual-stator brushless double feedback electric engine of the present invention; The external stator winding directly is connected with electrical network; The internal stator winding links to each other with electrical network through rectification adverser, and frequency and amplitude through rectification adverser is regulated the control winding current change the rotating speed and the torque of motor.
Claims (3)
1. dual-stator brushless double feedback electric engine; It is characterized in that; This motor comprises bidirectional rectifying inverter (4), end cap (7), rotating shaft (9), internal stator (2), around the rotor (3) of said internal stator (2), around the external stator (1) of said rotor (3); Be connected through bearing (8) between said rotating shaft (9) and the end cap (7), an end of rotor (3) is connected with rotating shaft (9), is provided with air gap between described two stators and the rotor (3);
Said external stator (1) comprises external stator (11) unshakable in one's determination and is arranged on the last number of poles of said external stator (11) unshakable in one's determination is the external stator winding (12) of 2p; Said internal stator (2) comprises internal stator iron core (21) and is arranged on the last number of poles of said internal stator iron core (21) is the internal stator winding (22) of 2q; Said p and q are respectively positive integer, and p and q are unequal; The three-phase lead-out wire of said external stator winding (11) links to each other with electrical network or main power source; The three-phase lead-out wire of said internal stator winding (22) is connected with said bidirectional rectifying inverter (4);
Said rotor (3) is provided with the winding of double-deck cage-shaped structure, connects between the two-layer mouse cage winding.
2. dual-stator brushless double feedback electric engine according to claim 1; It is characterized in that; Described rotor (3) comprises the mechanical support (34) of round barrel shape; The bucket wall medial and lateral of said mechanical support (34) are respectively arranged with internal layer iron core (31) and outer (32) unshakable in one's determination, and said internal layer (31) unshakable in one's determination is provided with internal layer mouse cage (35), and said outer (32) unshakable in one's determination are provided with outer mouse cage (33);
Said internal layer mouse cage (35) comprises along internal layer (31) circumferential array unshakable in one's determination, is parallel to axial interior sliver (351); Said outer mouse cage (33) comprise along outer mouse cage (33) circumferential array, be parallel to axially and with said in the outer sliver (331) of the corresponding setting of sliver (351), interior sliver (351) is connected with the end of pairing outer sliver (331) at rotor; The other end of rotor be provided with interior end ring (352) and outside end ring (332), said in end ring (352) be connected with interior sliver (351), said outer end ring (332) is connected with outer sliver (331).
3. dual-stator brushless double feedback electric engine according to claim 1 is characterized in that, described external stator winding (12) and internal stator winding (22) are heterogeneous symmetrical stator winding.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100173251A CN102545502A (en) | 2012-01-19 | 2012-01-19 | Dual-stator brushless double-fed motor |
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| CN2012100173251A CN102545502A (en) | 2012-01-19 | 2012-01-19 | Dual-stator brushless double-fed motor |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166399A (en) * | 2013-03-29 | 2013-06-19 | 沈阳工业大学 | Modular single-cage barrier rotor double-stator self-excitation synchronous motor and control method thereof |
| CN104578630A (en) * | 2015-01-08 | 2015-04-29 | 东南大学 | Double-stator permanent magnet brushless doubly-fed wind generator |
| CN104811002A (en) * | 2015-04-27 | 2015-07-29 | 华侨大学 | High power density permanent magnet brushless double-feed electric motor in novel structure |
| CN104821696A (en) * | 2015-05-04 | 2015-08-05 | 杨培应 | Function coordination machine |
| CN106451970A (en) * | 2016-09-26 | 2017-02-22 | 东南大学 | Four-electrical port brushless double-fed motor with reluctance rotor and double stators |
| 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 |
| CN106936279A (en) * | 2015-12-30 | 2017-07-07 | 华南理工大学 | A kind of bimorph transducer asynchronization capacity-increasing transformation system of Synchronous generator |
| CN109474151A (en) * | 2018-12-18 | 2019-03-15 | 安徽大学 | Brushless double-fed motor with double-stator special cage-shaped rotor structure |
| CN110311486A (en) * | 2019-07-01 | 2019-10-08 | 东南大学 | A kind of brushless dual-feed motor double-cage rotor and conducting bar connection method |
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| CN87212741U (en) * | 1987-10-21 | 1988-11-16 | 邹健 | Twin-stator 3-phase alternator |
| CN1753284A (en) * | 2005-09-20 | 2006-03-29 | 沈阳工业大学 | Bistator single rotor disk type brushless double feed ulternating current electric motor |
| CN102142750A (en) * | 2011-02-23 | 2011-08-03 | 中科盛创（青岛）电气有限公司 | Nested squirrel cage type direct-drive wind driven generator structure |
| CN202435219U (en) * | 2012-01-19 | 2012-09-12 | 东南大学 | Brushless double-fed motor |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN87212741U (en) * | 1987-10-21 | 1988-11-16 | 邹健 | Twin-stator 3-phase alternator |
| CN1753284A (en) * | 2005-09-20 | 2006-03-29 | 沈阳工业大学 | Bistator single rotor disk type brushless double feed ulternating current electric motor |
| CN102142750A (en) * | 2011-02-23 | 2011-08-03 | 中科盛创（青岛）电气有限公司 | Nested squirrel cage type direct-drive wind driven generator structure |
| CN202435219U (en) * | 2012-01-19 | 2012-09-12 | 东南大学 | Brushless double-fed motor |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166399A (en) * | 2013-03-29 | 2013-06-19 | 沈阳工业大学 | Modular single-cage barrier rotor double-stator self-excitation synchronous motor and control method thereof |
| CN103166399B (en) * | 2013-03-29 | 2015-11-11 | 沈阳工业大学 | Modular single-cage barrier rotor double-stator self-excitation synchronous machine and control method thereof |
| CN104578630A (en) * | 2015-01-08 | 2015-04-29 | 东南大学 | Double-stator permanent magnet brushless doubly-fed wind generator |
| CN104811002A (en) * | 2015-04-27 | 2015-07-29 | 华侨大学 | High power density permanent magnet brushless double-feed electric motor in novel structure |
| CN104821696A (en) * | 2015-05-04 | 2015-08-05 | 杨培应 | Function coordination machine |
| CN106936279A (en) * | 2015-12-30 | 2017-07-07 | 华南理工大学 | A kind of bimorph transducer asynchronization capacity-increasing transformation system of Synchronous generator |
| CN106451970A (en) * | 2016-09-26 | 2017-02-22 | 东南大学 | Four-electrical port brushless double-fed motor with reluctance rotor and double stators |
| CN106451970B (en) * | 2016-09-26 | 2018-08-21 | 东南大学 | Four electrical port brushless dual-feed motor of reluctance rotor bimorph transducer |
| 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 |
| CN109474151A (en) * | 2018-12-18 | 2019-03-15 | 安徽大学 | Brushless double-fed motor with double-stator special cage-shaped rotor structure |
| CN110311486A (en) * | 2019-07-01 | 2019-10-08 | 东南大学 | A kind of brushless dual-feed motor double-cage rotor and conducting bar connection method |
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Application publication date: 20120704 |