CN112104126A - Three-phase 24/20-pole distributed electro-magnetic doubly salient wind driven generator - Google Patents
Three-phase 24/20-pole distributed electro-magnetic doubly salient wind driven generator Download PDFInfo
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- CN112104126A CN112104126A CN202010913228.5A CN202010913228A CN112104126A CN 112104126 A CN112104126 A CN 112104126A CN 202010913228 A CN202010913228 A CN 202010913228A CN 112104126 A CN112104126 A CN 112104126A
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- 238000004804 winding Methods 0.000 claims abstract description 66
- 230000005284 excitation Effects 0.000 claims abstract description 27
- 238000010586 diagram Methods 0.000 description 6
- 230000004907 flux Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 239000013598 vector Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
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- H02K11/046—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention relates to a three-phase 24/20-pole distributed electro-magnetic doubly salient wind generator, which comprises a 24/20-pole distributed electro-magnetic doubly salient motor and a three-phase uncontrolled rectifier diode, wherein the electro-magnetic doubly salient motor comprises a stator and a rotor, a plurality of stator poles are arranged on the stator, excitation coils are wound on the stator poles and are connected with each other to form an excitation winding, armature coils are also wound on the stator poles, the armature coils on the front stator pole and the rear stator pole which are separated into two stator poles are connected with each other to form an armature winding, the number of the armature windings is 3, the 3 armature windings form a three-phase armature winding, one end of the three-phase armature winding is led out and combined together to form a negative pole of the wind generator, and the other end of the three-phase armature winding is connected with the three-phase uncontrolled rectifier diode. Compared with the prior art, the invention has the advantages of reducing the voltage fluctuation rate and the torque fluctuation rate of the generator, improving the output capacity of the motor and the like.
Description
Technical Field
The invention relates to the technical field of special motors, in particular to a three-phase 24/20-pole distributed electro-magnetic doubly salient wind driven generator.
Background
At present, wind power generators mainly comprise a cage type asynchronous generator, a double-fed generator and a permanent magnet synchronous generator, the number of poles of the cage type asynchronous generator and the double-fed generator is relatively mature, but a conversion device is complex, the efficiency and the power density of the permanent magnet synchronous generator are high, but an air gap magnetic field cannot be adjusted. The high reliability, low-speed directly drive, high efficiency is aerogenerator's development trend. The electrically excited double salient pole is a new type brushless motor, its stator and rotor are both salient pole tooth slot structure, on the stator an armature winding and an exciting winding are mounted, and on the rotor there is no winding. The excitation winding on the stator is wound around the armature winding to provide an excitation magnetic field, and the structure can conveniently realize the magnetic field adjustment of the electric excitation doubly salient motor. The double salient electro-magnetic motor does not need to use a permanent magnet, and the rotor does not have a winding, a brush or a commutator, so the double salient electro-magnetic motor has the outstanding advantages of simple structure, high reliability, low cost, easiness in fault demagnetization and the like. And the motor and an external rectification circuit can form an electro-magnetic double salient brushless direct current generator system, and the successful application of the motor to a wind power generation system is expected to reduce the cost of the power generation system and improve the reliability of the system.
Currently, in the research in the field of wind power generation, an electrically excited doubly salient generator usually selects a plurality of stator poles and a plurality of rotor poles to reduce torque ripple and improve the utilization rate of materials, the stator and rotor pole number matching generally meets 6N/4N or 6N/8N (N is an integer), and the common stator and rotor pole number matching is 24/16 and 24/32. However, the currently used doubly salient electro-magnetic generator generally adopts a concentrated excitation mode, that is, an excitation winding crosses a plurality of stator poles, and each stator pole is wound with an armature winding, which causes asymmetry of magnetic circuits of each phase, further causes higher fluctuation rate of rectified output voltage and higher fluctuation rate of torque, and increases vibration and noise of the motor.
Disclosure of Invention
The invention aims to overcome the defects of high fluctuation rate of rectified output voltage and high fluctuation rate of torque of an electro-magnetic doubly salient generator in the prior art, and provides a three-phase 24/20-pole distributed electro-magnetic doubly salient wind generator.
The purpose of the invention can be realized by the following technical scheme:
a three-phase 24/20-pole distributed electro-magnetic doubly salient wind generator comprises a 24/20-pole distributed electro-magnetic doubly salient motor and a three-phase uncontrolled rectifier diode, the electro-magnetic doubly salient motor comprises a stator and a rotor, wherein a plurality of stator poles are arranged on the stator, the stator poles are wound with excitation coils which are mutually connected to form excitation windings, armature coils are wound on the stator poles, the armature coils on the front and rear stator poles which are separated into two stator poles are connected with each other to form an armature winding, the number of the armature windings is 3, the 3 armature windings form a three-phase armature winding, one end of the three-phase armature winding is led out and combined together to form a negative pole of the wind driven generator, and the other end of the three-phase armature winding is connected with the three-phase uncontrolled rectifier diode to form a full-bridge rectifier circuit as a positive pole of the wind driven generator.
The electric excitation doubly salient motor is an inner rotor or outer rotor structure doubly salient motor.
The current applied in the excitation winding is direct current.
The number of the stator poles is 24, and the armature winding comprises 8 stator poles.
Further, an electrical angle between adjacent two stator poles in the armature winding is 180 °.
The winding directions of the exciting coils on the adjacent stator poles are opposite, so that the exciting coils generate 12 pairs of pole exciting magnetic fields in the air gap magnetic field, and distributed exciting magnetic potential is presented in the circumferential direction of the air gap.
The excitation coil is a concentrated non-overlapping excitation coil.
The excitation coils are connected in series.
The armature coils are connected in series in the same direction, so that the electromotive force synthesized by the two armature coils is the maximum.
Further, the mutual connection in series in the same direction is specifically that the head of a single armature coil in two adjacent armature coils is connected with the tail of another armature coil.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention intensively winds the excitation winding on each stator pole and evenly distributes the excitation winding around the circumference of the stator, so that each phase of magnetic circuit is symmetrical, and the torque fluctuation and the rectified output voltage pulsation are reduced.
2. The invention connects two armature coils in series in the same direction, the phase difference of electromotive force vector of the two armature coils on the stator pole of every 2 stator poles is 180 degrees, eliminates even harmonic and third harmonic in counter electromotive force, and reduces the electromagnetic torque fluctuation rate of the motor.
3. The three-phase armature winding adopts the full-bridge rectification circuit, so that the output capacity of the motor is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the coil potential vectors of the present invention;
FIG. 3 is a schematic diagram of a full bridge rectifier circuit according to the present invention;
FIG. 4 is a schematic diagram of the no-load flux linkage of the generator of the present invention;
FIG. 5 is a schematic diagram of the no-load back emf of the generator of the present invention;
FIG. 6 is a schematic diagram of the harmonic components of the generator of the present invention;
fig. 7 is a schematic diagram of the no-load rectified output voltage of the generator of the present invention.
Reference numerals:
1-a stator; 2-a rotor; 3-a stator pole; 4-rotor poles; 5-excitation winding; 6-armature winding; 7-an armature coil; l isf+-an inflow end of the excitation current, Lf--an outflow end of the excitation current; a header of the A-A phase armature winding; and the tail part of the X-A phase armature winding.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in figure 1, a three-phase 24/20-pole distributed electro-magnetic doubly salient wind generator comprises a 24/20-pole distributed electro-magnetic doubly salient motor and a three-phase uncontrolled rectifier diode, the electro-magnetic doubly salient motor comprises a stator 1 and a rotor 2, a plurality of stator poles 3 are arranged on the stator 1, exciting coils are wound on the stator poles 3 and are connected with each other to form an exciting winding 5, armature coils 7 are also wound on the stator poles 3, the armature coils 7 on the front and rear stator poles 3 which are separated into two stator poles 3 are connected with each other to form armature windings 6, the number of the armature windings 6 is 3, 3 armature windings 6 form three-phase armature windings, as shown in figure 3, one end of each three-phase armature winding is led out and combined to form a negative pole of the wind generator, the other end of each three-phase uncontrolled rectifier diode is connected with the three-phase uncontrolled rectifier diode to form a positive pole of, a full bridge rectifier circuit is formed.
As shown in fig. 2, the three-phase armature winding includes an a-phase armature winding, a B-phase armature winding, and a C-phase armature winding, and the angle between the armature windings is 120 °.
The electric excitation double-salient motor is a double-salient motor with an inner rotor or outer rotor structure.
The three-phase uncontrolled rectifier diode comprises 3 diode groups which are connected in parallel and are respectively connected with winding resistors and inductors of the A-phase armature winding, the B-phase armature winding and the C-phase armature winding, and a load resistor is further arranged in the three-phase uncontrolled rectifier diode to form a full-bridge rectifier circuit integrally.
The current applied in the excitation winding 5 is direct current, and the current input end of the direct current is Lf+The outflow end is Lf-。
The number of the stator poles 3 is 24, and the armature winding 6 comprises 8 stator poles 3, wherein the A-phase armature winding is provided with a head part A and a tail part X.
When the rotor pole 4 slides in and out of the stator pole 3, the phase corresponding to the stator pole 3 can supply power to the load, and the output power is improved.
The electrical angle between two adjacent stator poles 3 in the armature winding 6 is 180 °.
The winding directions of the exciting coils on the adjacent stator poles 3 are opposite, so that the exciting coils 4 generate 12 pairs of pole exciting magnetic fields in the air gap magnetic field, distributed exciting magnetic potential is presented in the circumferential direction of the air gap, and torque fluctuation and rectified output voltage pulsation are reduced.
The excitation coil is a concentrated non-overlapping excitation coil.
The excitation coils are connected in series.
The armature coils 7 are connected in series in the same direction, so that the electromotive force synthesized by the two armature coils 7 is the maximum, and the connection in series in the same direction is specifically that the head of a single armature coil 7 in the two adjacent armature coils 7 is connected with the tail of the other armature coil 7, so that the even harmonic and the third harmonic of the back electromotive force are eliminated, and the torque ripple and the harmonic distortion rate of the back electromotive force are reduced.
A. B, C the no-load flux linkage of the three-phase armature winding is shown in FIG. 4, the result shows that the flux linkage waveform of each phase is symmetrical; A. b, C No-load back emf of the three-phase armature winding is shown in FIG. 5, the harmonic component of the No-load back emf of the A-phase armature winding is shown in FIG. 6, only odd harmonic exists in the harmonic component of the A-phase No-load back emf, even harmonic does not exist, and fundamental wave and fifth harmonic mainly exist, which shows that the invention can reduce torque ripple and harmonic distortion rate; the unfiltered unloaded rectified output voltage waveform is shown in fig. 7, where the output voltage fluctuates only between 140V and 160V, with a low fluctuation rate.
In addition, it should be noted that the specific implementation examples described in this specification may have different names, and the above contents described in this specification are only illustrations of the structures of the present invention. All equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the invention. Various modifications or additions may be made to the described embodiments or methods may be similarly employed by those skilled in the art without departing from the scope of the invention as defined in the appending claims.
Claims (10)
1. The utility model provides a three-phase 24/20 utmost point distribution electro-magnetic double salient pole wind-driven generator, its characterized in that, includes 24/20 utmost point distribution's electro-magnetic double salient pole motor and three-phase uncontrolled rectifier diode, electro-magnetic double salient pole motor includes stator (1) and rotor (2), be equipped with a plurality of stator poles (3) on stator (1), the system has excitation coil on stator pole (3), excitation coil interconnect constitutes excitation winding (5), still the system has armature coil (7) on stator pole (3), armature coil (7) interconnect on two stator poles (3) around the interval is two stator poles (3), forms armature winding (6), the quantity of armature winding (6) is 3, and 3 armature winding (6) form three-phase armature winding, the one end of three-phase armature winding is drawn forth the group and is in the same place, the other end of the three-phase uncontrolled rectifier diode is connected with the three-phase uncontrolled rectifier diode and is used as the anode of the wind driven generator to form a full-bridge rectifier circuit.
2. The three-phase 24/20-pole distributed electro-magnetic doubly salient wind generator of claim 1, wherein the electro-magnetic doubly salient motor is an inner rotor or outer rotor doubly salient motor.
3. A three-phase 24/20-pole distributed electro-magnetic doubly salient wind generator according to claim 1, characterized in that the current applied in the field winding (5) is direct current.
4. A three-phase 24/20 pole distributed electro-magnetic doubly salient wind generator according to claim 1, wherein the number of stator poles (3) is 24, and the armature winding (6) comprises 8 stator poles (3).
5. A three-phase 24/20-pole distributed electro-magnetic doubly salient wind generator according to claim 4, characterized in that the electrical angle between two adjacent stator poles (3) in the armature winding (6) is 180 °.
6. A three-phase 24/20 pole distributed electro-magnetic doubly salient wind generator as claimed in claim 1, wherein the winding directions of the exciting coils on adjacent stator poles (3) are opposite.
7. The three-phase 24/20-pole distributed electro-magnetic doubly salient wind generator of claim 1, wherein the field coils are concentrated non-overlapping field coils.
8. The three-phase 24/20-pole distributed electro-magnetic doubly salient wind generator of claim 1, wherein the excitation coils are connected in series.
9. A three-phase 24/20 pole distributed electro-magnetic doubly salient wind generator as claimed in claim 1, wherein said armature coils (7) are connected in series and in the same direction.
10. A three-phase 24/20 pole distributed electro-magnetic doubly salient wind generator according to claim 9, characterized in that the mutual co-directional serial connection is implemented by connecting the head of a single armature coil (7) with the tail of another armature coil (7) in two adjacent armature coils (7).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010913228.5A CN112104126B (en) | 2020-09-03 | 2020-09-03 | Three-phase 24/20-pole distributed electro-magnetic doubly salient wind driven generator |
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| CN202010913228.5A CN112104126B (en) | 2020-09-03 | 2020-09-03 | Three-phase 24/20-pole distributed electro-magnetic doubly salient wind driven generator |
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| CN112104126A true CN112104126A (en) | 2020-12-18 |
| CN112104126B CN112104126B (en) | 2023-04-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112910114A (en) * | 2021-01-25 | 2021-06-04 | 上海电力大学 | Four-phase 16/18-pole hybrid excitation fault-tolerant reluctance generator |
| CN114553076A (en) * | 2022-02-07 | 2022-05-27 | 苏州达思灵新能源科技有限公司 | Micro-torque fluctuation doubly salient direct-current excitation generator |
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2020
- 2020-09-03 CN CN202010913228.5A patent/CN112104126B/en active Active
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112910114A (en) * | 2021-01-25 | 2021-06-04 | 上海电力大学 | Four-phase 16/18-pole hybrid excitation fault-tolerant reluctance generator |
| CN114553076A (en) * | 2022-02-07 | 2022-05-27 | 苏州达思灵新能源科技有限公司 | Micro-torque fluctuation doubly salient direct-current excitation generator |
| CN114553076B (en) * | 2022-02-07 | 2023-11-10 | 苏州达思灵新能源科技有限公司 | Micro-torque fluctuation doubly salient direct current excitation generator |
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| CN112104126B (en) | 2023-04-28 |
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