CN202435218U - Axial brushless doubly-fed motor - Google Patents
Axial brushless doubly-fed motor Download PDFInfo
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- CN202435218U CN202435218U CN2012200255399U CN201220025539U CN202435218U CN 202435218 U CN202435218 U CN 202435218U CN 2012200255399 U CN2012200255399 U CN 2012200255399U CN 201220025539 U CN201220025539 U CN 201220025539U CN 202435218 U CN202435218 U CN 202435218U
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Abstract
The utility model discloses an axial brushless doubly-fed motor, comprising a bidirectional rectification inverter, an end cover, a rotation shaft, a rotor arranged on the rotation shaft, a left stator and a right stator, wherein the left stator and the right stator are arranged at two axial sides of the rotor symmetrically, the rotation shaft is connected with the end cover through a bearing, and two air gaps are respectively formed between the two stators and the rotor. The axial brushless doubly-fed motor disclosed by the utility model has excellent adaptability and can be designed into a variable-speed constant-frequency generator as well as a constant-frequency speed-regulating motor. The motor is simple and compact in structure and high in power density and is high in reliability and low in operation and maintenance cost due to absence of an electric brush slip ring.
Description
Technical field
The utility model belongs to motor and control technology field thereof, relates 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.
The utility model content
Technical problem:The purpose of the utility model is to provide a kind of axial brushless dual-feed motor that improves system reliability and space availability ratio.
Technical scheme:The axial brushless dual-feed motor of the utility model; The left stator and the right stator that comprise bidirectional rectifying inverter, end cap, rotating shaft, be arranged on rotor in the rotating shaft, be provided with in the axial bilateral symmetry of rotor; Be connected through bearing between rotating shaft and the end cap, be provided with air gap between two stators and the rotor;
Left side stator comprises left stator core and is arranged on that number of poles is the left stator winding of 2p on the left stator core, and right stator comprises right stator core and be arranged on that number of poles is the right stator winding of 2q on the right stator core, and p and q are respectively positive integer, and p and q are unequal; The three-phase lead-out wire of left side stator winding links to each other with electrical network or main power source; The three-phase lead-out wire of right stator winding is connected with bidirectional rectifying inverter;
Rotor comprises perpendicular to the axial discoid mechanical support of rotating shaft; The bilateral symmetry of mechanical support is provided with circular left iron core and right iron core; Be respectively arranged with left iron core end ring and right iron core end ring on the interior ring of left iron core and right iron core; Be respectively arranged with circumferentially evenly distributed left iron core sliver radially and right iron core sliver on the annulus of left iron core and right iron core; One end of left iron core sliver is connected with the left iron core end ring, and an end of right iron core sliver is connected with right iron core end ring, and the left iron core sliver is connected with outer shroud one side of right iron core sliver at left iron core and right iron core.
In the utility model, left stator winding and right stator winding are heterogeneous symmetrical stator winding.
The electromagnetic structure of the utility model can be made up of a plurality of elementary cells, and elementary cell is cascade vertically.
Beneficial effect:The utility model is compared 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.
When tradition tandem type brushless dual-feed motor adopts axial flux structure, 4 winding overhangs are arranged along radial direction, and the axial brushless dual-feed motor of the axial flux structure of the utility model; Owing to can along radial direction 2 winding overhangs only be arranged with two stator coaxial arrangement in the both sides of rotor, reduce invalid length; Therefore space availability ratio is high; Under the equal-wattage grade, the axial length of motor shortens, and structure is compact more.In addition, can also arrange a plurality of motor elementary cells vertically, improve capacity motor, have greater flexibility.
Compare with the two stator motors of the brushless double feed of radial structure, its control winding does not receive the limited restriction in internal stator space in the radial structure, and it is identical with the power winding that its capacity can be designed to, and therefore, the adjustable speed scope of motor can obviously increase.
Compare with shared stator core formula brushless dual-feed motor, separated by disk rotor between two stators, the at one end corresponding sliver of two-layer mouse cage links to each other, and makes to 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 the axial dual-stator brushless double-fed wind power generator systematic schematic diagram of the utility model;
Fig. 2 is the axial brushless dual-feed motor complete section structural representation of the utility model;
Fig. 3 is the axial brushless dual-feed motor three-dimensional structure diagram of the utility model;
Fig. 4 is the axial brushless dual-feed motor left side stator core construction sketch map of the utility model;
Fig. 5 is the axial brushless dual-feed motor left side stator axis schematic cross-section of the utility model;
Fig. 6 is the right stator core construction sketch map of the axial brushless dual-feed motor of the utility model;
Fig. 7 is the right stator axis schematic cross-section of the axial brushless dual-feed motor of the utility model;
Fig. 8 is the axial brushless dual-feed motor rotor structure sketch map of the utility model;
Fig. 9 is the axial brushless dual-feed motor rotor bar connection structural representation of the utility model;
Figure 10 makes vscf generator or motor operation sketch map for the axial brushless dual-feed motor of the utility model is connected to electrical network.
Have among the figure: 1 is left stator, and 2 is right stator, and 3 is rotor, and 4 is bidirectional rectifying inverter, 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 left stator core, and 12 is left stator winding, and 13 is left stator tooth, and 14 is left stator slot; 21 is right stator core, and 22 is right stator winding, and 23 is right stator tooth, and 24 is right stator slot; 31 for rotor mechanical supports, and 32 is left iron core, and 33 is the left iron core end ring, and 34 is the left iron core sliver; 35 is right iron core, and 36 is right iron core end ring, and 37 is right iron core sliver.
Embodiment
Fig. 1 is this dual-stator brushless dual feedback wind power generation system, left stator 1 and right stator 2 that this motor comprises bidirectional rectifying inverter 4, end cap 7, rotating shaft 9, be arranged on rotor 3 in the rotating shaft 9, be provided with in the axial bilateral symmetry of rotor 3.It is the left stator winding 12 of 2p that one cover number of poles is arranged on the wherein left stator 1, and it is the right stator winding 22 of 2q that a cover number of poles is arranged on the right stator 2, and wherein p and q are respectively positive integer.Left side stator winding 12 is main power winding, directly is connected with electrical network or main power source; Right 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 the 2q stator winding.Rotor 3 directly or through gear box 5 and blower fan wind wheel 6 is set up mechanical connection.
The magnetic flux distribution direction and the shaft parallel of the utility model device, 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 vertically rotor 3 places between left stator 1 and the right stator 2, the mechanical axis coinciding of stator and rotor.Be connected through bearing 8 between rotating shaft 9 and the end cap 7, rotor 3 is connected with rotating shaft 9, is provided with air gap between two stators and the rotor 3, thereby air gap transmits electromagnetic torque and realizes this electric power generation or electric operation between rotor.
Like Fig. 4 and shown in Figure 6; Left side stator 1 comprises left stator core 11 and is arranged on that number of poles is the left stator winding 12 of 2p on the said left stator core 11, and right stator 2 comprises right stator core 21 and is arranged on that number of poles is the right stator winding 22 of 2q on the said right stator 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. 8 is the rotor 3 of the axial brushless dual-feed motor of the utility model; Comprise on the rotor 3 perpendicular to the axial discoid mechanical support 31 of rotating shaft 9; The bilateral symmetry of mechanical support 31 is provided with circular left iron core 32 and right iron core 35, is respectively arranged with left iron core end ring 33 and right iron core end ring 36 on the interior ring of left iron core 32 and right iron core 35.Two rotor cores are reeled by the double-sided insulation silicon steel sheet and are formed, and dashing in the punching has equally distributed hole, is used to place sliver.
Fig. 9 is rotor bar mounting structure figure; On the annulus of left iron core 32 and right iron core 35; Left iron core sliver 34 radially is circumferentially evenly distributed with right iron core sliver 37 edges; One end of left iron core sliver 34 is connected with left iron core end ring 33, and an end of right iron core sliver 37 is connected with right iron core end ring 36, and left iron core sliver 34 is connected with outer shroud one side of right iron core sliver 37 at left iron core 32 and right iron core 35.
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 axial brushless dual-feed motor of the utility model; 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 axial brushless dual-feed motor of the utility model; 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 (2)
1. axial brushless dual-feed motor; It is characterized in that; This motor comprises bidirectional rectifying inverter (4), end cap (7), rotating shaft (9), be arranged on rotor (3) in the said rotating shaft (9), be provided with in the axial bilateral symmetry of said rotor (3) left stator (1) and right stator (2); Be connected through bearing (8) between rotating shaft (9) and the end cap (7), be provided with air gap between described two stators and the rotor (3);
Said left stator (1) comprises left stator core (11) and is arranged on the last number of poles of said left stator core (11) is the left stator winding (12) of 2p; Said right stator (2) comprises right stator core (21) and is arranged on the last number of poles of said right stator core (21) is the right 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 left stator winding (12) links to each other with electrical network or main power source, and the three-phase lead-out wire of said right stator winding (22) links to each other with bidirectional rectifying inverter (4);
Described rotor (3) comprises perpendicular to the axial discoid mechanical support (31) of rotating shaft (9); The bilateral symmetry of said mechanical support (31) is provided with circular left iron core (32) and right iron core (35); Be respectively arranged with left iron core end ring (33) and right iron core end ring (36) on the interior ring of said left iron core (32) and right iron core (35); On the annulus of left iron core (32) and right iron core (35), be respectively arranged with circumferentially evenly distributed left iron core sliver (34) radially and right iron core sliver (37); One end of said left iron core sliver (34) is connected with left iron core end ring (33); One end of said right iron core sliver (37) is connected with right iron core end ring (36), and left iron core sliver (34) is connected with outer shroud one side of right iron core sliver (37) at left iron core (32) and right iron core (35).
2. axial brushless dual-feed motor according to claim 1 is characterized in that, described left stator winding (12) and right stator winding (22) are heterogeneous symmetrical stator winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200255399U CN202435218U (en) | 2012-01-19 | 2012-01-19 | Axial brushless doubly-fed motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200255399U CN202435218U (en) | 2012-01-19 | 2012-01-19 | Axial brushless doubly-fed motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202435218U true CN202435218U (en) | 2012-09-12 |
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ID=46784627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200255399U Expired - Fee Related CN202435218U (en) | 2012-01-19 | 2012-01-19 | Axial brushless doubly-fed motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202435218U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545501A (en) * | 2012-01-19 | 2012-07-04 | 东南大学 | Axial dual-stator brushless double-fed motor |
| CN105356706A (en) * | 2015-12-14 | 2016-02-24 | 重庆理工大学 | Low-rotation-speed disk-type doubly-fed generator and exciting current applying method thereof |
| CN105811674A (en) * | 2016-05-28 | 2016-07-27 | 杨永清 | Method for manufacturing permanent magnet power generators with equal-diameter stator and rotor combinations |
-
2012
- 2012-01-19 CN CN2012200255399U patent/CN202435218U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545501A (en) * | 2012-01-19 | 2012-07-04 | 东南大学 | Axial dual-stator brushless double-fed motor |
| CN105356706A (en) * | 2015-12-14 | 2016-02-24 | 重庆理工大学 | Low-rotation-speed disk-type doubly-fed generator and exciting current applying method thereof |
| CN105356706B (en) * | 2015-12-14 | 2017-09-15 | 重庆理工大学 | Slow-speed of revolution disc type double-fed generator and its exciting current applying method |
| CN105811674A (en) * | 2016-05-28 | 2016-07-27 | 杨永清 | Method for manufacturing permanent magnet power generators with equal-diameter stator and rotor combinations |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120912 Termination date: 20150119 |
|
| EXPY | Termination of patent right or utility model |