CN104506004B - Seventh-harmonic excitation brushless synchronous generator - Google Patents
Seventh-harmonic excitation brushless synchronous generator Download PDFInfo
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- CN104506004B CN104506004B CN201410803676.4A CN201410803676A CN104506004B CN 104506004 B CN104506004 B CN 104506004B CN 201410803676 A CN201410803676 A CN 201410803676A CN 104506004 B CN104506004 B CN 104506004B
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Abstract
The invention discloses a seventh-harmonic excitation brushless synchronous generator. The generator mainly consists of a main generator and an alternating current exciter which are coaxial with each other, wherein a direct current excitation source of a stator pole winding of the alternating current exciter is from a direct current power supply formed by rectifying a three-phase seven-harmonic winding in a stator iron core of the main generator by a rectifier; a stator of the generator is provided with 42 slots, 4 poles and 3 phases; a rotor of the main generator is of an integrated convex pole type. The electrical performance of the seven-harmonic excitation brushless synchronous generator disclosed by the invention is higher than that of fundamental wave excitation, third-harmonic excitation and fifth-harmonic excitation brushless synchronous generators.
Description
Technical field
The present invention relates to a kind of power equipment, and in particular to a kind of the seventh harmonic excitation brushless synchronous generator.
Background technology
National inventing patent publication number CN101562382A ZL200910115439.8 disclose a kind of quintuple harmonic excitation
No-brush synchronous generator, quintuple harmonic excitation brushless synchronous generator overcome fundamental wave excitation short-circuit current multiple it is little and with it is main around
Group has the defect of electromagnetic interference, and current in middle wire is to the degaussing of triple-frequency harmonics magnetic field when also overcoming trio-time harmonic wave excitation generator parallel connection
Big defect, therefore, quintuple harmonic excitation brushless synchronous generator electric property has than fundamental wave excitation and third harmonic excitation
The characteristics of no-brush synchronous generator electric property is more excellent.
The groove of generator unit stator 60 in above-mentioned patent quintuple harmonic excitation brushless synchronous generator, the pole of number of poles 4, the phase of the number of phases 3, three
It is orthogonal between phase quintuple harmonics winding and three-phase main winding, without electromagnetic interference, if but in the groove of generator unit stator 42, the pole of number of poles 4, phase
During 3 phase of number, it is impossible to arrange orthogonal between three-phase quintuple harmonics winding and three-phase main winding, thus certainly exist electromagnetic interference phenomenon,
The quintuple harmonic excitation brushless synchronous generator electric property to be had is not reached, therefore has that to seek new harmonic exitation brushless same
Necessity of step generator.
The content of the invention
It is an object of the invention to provide a kind of the seventh harmonic excitation brushless synchronous generator, to overcome in generator unit stator
42 grooves, the pole of number of poles 4 is not suitable with using the defect of quintuple harmonics magnetic technology under conditions of the phase of the number of phases 3, because under these conditions 3
Between phase quintuple harmonics winding and 3 phase main windings cannot quadrature arrangement, between main winding and quintuple harmonics winding double winding exist
Electromagnetic interference phenomenon, have impact on electric property, it is impossible to make high-quality brushless generator.And under these conditions, using seven times
Harmonic exitation technology, adopts appropriate winding construction between 3 phase the seventh harmonic windings and 3 phase main windings, can make the seventh harmonic
Winding with main winding quadrature arrangement, realize that, without electromagnetic interference phenomenon, electric property is excellent between main winding and the seventh harmonic winding
It is good, high-quality no-brush synchronous generator can be made.
The present invention is achieved like this, a kind of the seventh harmonic excitation brushless synchronous generator, and generator is by main generator
Coaxially constitute with the machine of AC excitation two, main generator unit stator iron core is taken from the DC excitation source of AC exciter magnetic pole of the stator winding
In the dc source that formed of the rectified device rectification of three-phase the seventh harmonic winding；It is characterized in that：The groove of generator unit stator 42, number of poles
For 4 poles, the phase of the number of phases 3, main generator rotor makes overall salient type, there is even air gap between stator and rotor, and pole embrace is
0.8, generator main winding is the concentric double layer winding that fractional-slot does not wait circle, and by six identical coil groups three-phase symmetrical is formed
Winding, each coil group has seven coils, and seven coils are made up of the coil of two parts concentric type again, and Part I is same by four
Core type coil is constituted, and coil pitch is respectively from big to small 10,8,6,4, and the number of turn of each coil is respectively from big to small 8,
6,4,1；Part II is made up of three concentric coils, and coil pitch is respectively from big to small 9,7,5, and the circle of each coil
Number is respectively from big to small 7,5,2；The pitch of three-phase the seventh harmonic winding is 1, and number of poles is 7 times of main winding number of poles, is 3 relative
The grade circle coil Single-layer Windings of title, without the seventh harmonic content in main winding, without fundamental wave content in the seventh harmonic winding, thus seven times
Harmonic winding is orthogonal with main winding, and without electromagnetic interference, therefore this seventh harmonic self-excitation encourages field performance with it, and excitation is not received
Load disturbance.
The solution have the advantages that, although in the groove of generator unit stator groove 42, the pole of the number of phases 4, five should not be adopted in the phase of the number of phases 3
Subharmonic excitation, because 3 phase quintuple harmonics windings and 3 phase main windings cannot quadrature arrangement, unavoidably have electromagnetic interference each other,
And the seventh harmonic excitation is taken, and 3 phase the seventh harmonic windings and 3 phase main winding quadrature arrangements can be made, it is existing without electromagnetic interference mutually
As excellent electrical properties can make high-quality no-brush synchronous generator, reach the purpose of invention.
Description of the drawings
Fig. 1 is the stator main winding U phases of the present invention（UN windings）Layout drawing.
Fig. 2 is the seventh harmonic winding layout drawing of the present invention.
Fig. 3 is the electrical schematic diagram of the present invention.
1 is stator in figure, and 2 is rotor.
Specific embodiment
As shown in figure 1, implementing a seventh harmonic excitation brushless synchronous generator, the groove of number of stator slots 42, the pole of number of poles 4, phase
The phase of number 3, parallel branch number a=2, stator main winding is the Double Layer Winding that a kind of fractional-slot does not wait circle.By taking U phases as an example, UN windings are simultaneously
Connection circuitry number a=2, U1N1 are a parallel branch, and U2N2 is another parallel branch, and U1N1 is a coil group, and U2N2 is another
One coil group, per phase, such as UN（That is U phases）There are 2 coil groups, three-phase has 6 coil groups.
By taking coil group U1N1 as an example, each coil group has seven coils, seven coils by two parts concentric type line
Circle composition, Part I has four concentric coils, and coil pitch is followed successively by from big to small 10,8,6,4, and the circle of each coil
Number is followed successively by from big to small 8,6,4,1；Part II has three concentric coils, and coil pitch is followed successively by from big to small 9,7,5,
And the number of turn of each coil is followed successively by from big to small 7,5,2；
U phase windings UN is composed in parallel by two coil groups U1N1 and U2N2, as shown in figure 1, same V phase windings VN is by two
Coil group V1N1 and V2N2 are composed in parallel（It is not drawn into）, W phase windings WN composes in parallel by two coil groups W1N1 and W2N2（Do not draw
Go out）, six coil group structures are that pitch is identical with number of turn rule, V, W and U phase winding, i.e. VN, WN and UN winding mutual deviations
120 electrical angles, constitute symmetrical three-phase windings, and be often in parallel circuitry number a=2, and three-phase and four-line draws U, V, W, N, this fraction
Grade circle Concentrical winding forms double-decker to groove in stator slot, and this grade circle is arranged and eliminates the seventh harmonic, and humorous five times
Ripple content also very little, not only voltage-form distortion rate is little, and facilitates views with the seventh harmonic excitation mode, it is ensured that main winding with
The seventh harmonic winding without electromagnetic interference, the armature-reaction of main winding also not to the degaussing of the seventh harmonic magnetic field, to ensure the seventh harmonic
The dynamic capability of excitation.
As shown in Fig. 2 a7x7, b7y7, c7z7Shown, the pitch of the seventh harmonic winding is 1, and number of poles is the 7 of main winding number of poles
Times, i.e. 28 poles, 3 is symmetrical, and the circle such as the winding of formation each coil is equidistant, and 3 mutually constitute symmetrical Single-layer Windings, a7x7, b7y7, c7z7
For Y-connection, i.e. x7, y7, z7It is connected together, is not brought up, only draws a7, b7, c7, abbreviation three-phase the seventh harmonic winding.Therefore
There is the main winding of bilayer in each groove of generator, also there is the seventh harmonic winding of individual layer, each groove is 3 layers, copper factor base
This balance.Without fundamental wave potential in the seventh harmonic winding, therefore the seventh harmonic winding is not disturbed by main winding, does not also receive fundamental wave armature
The interference of reaction；Because not containing 7 subharmonic in main winding, fundamental wave is not contained in the seventh harmonic winding yet, therefore main winding is humorous with seven times
Wave winding is orthogonal, mutually all without electromagnetic interference.In addition to glitch-free advantage, also have the advantage that, seven in main field
Subharmonic content also increases with load, and exciting current also increases, and this also causes the seventh harmonic magnetic field to increase, with proof load size
During change, the seventh harmonic energy size is also with the ability for changing, and dynamic property is good.This mode overcome fundamental wave magnetic field source with
Main winding has the shortcomings that to disturb and be difficult to maintain short-circuit current multiple to be equal to or more than 3 times of rated current, also overcomes three-phase three
Subharmonic Exciting Windings for Transverse Differential Protection and main winding also noisy shortcoming, current in middle wire when also overcoming trio-time harmonic wave excitation generator parallel connection
Greatly, big to the degaussing of triple-frequency harmonics magnetic field, the parallel oscillation for easily causing, the shortcoming of job insecurity is also overcomed in stator slot
42 grooves, the pole of number of poles 4, in the case that the number of phases is 3 phases, three-phase quintuple harmonics winding cannot mutually have electricity with main winding quadrature arrangement
The shortcoming of magnetic disturbance；In structure without additional permanent magnetic auxiliary exciter, it is only necessary to which main generator and the machine of AC exciter two are coaxial
Composition, the axial length of the brushless generator of composition more coaxial than three machines with pilot exciter is short, simple structure, small volume, weight
Amount is light, low cost, and suitable with the performance of the coaxial no-brush synchronous generator of three machines with permanent magnetic auxiliary exciter in performance.
Analysis in further detail below, calculating, it was demonstrated that the present embodiment suitably adopts the seventh harmonic excitation, and should not adopt five times
The reason for harmonic exitation.
（One）Without the proof of fundamental wave sensing in 7 subharmonic windings
With a7x7In seven turn coils as a example by left conductor, the potential of sensing forms 7 vectors, 7 vectors into positive 7 side shape, therefore its
Fundamental wave induced potential and be zero, 7 potential vectors of right conductor and be also zero, it follows that without fundamental wave sense in 7 subharmonic windings
Answer potential.
（Two）In fundamental wave winding, 7 subharmonic winding coefficient Kad7=0。
（Three）In fundamental wave winding, 5 subharmonic winding coefficient Kad5=-0.0149, if therefore with 5 subharmonic excitations, 5 subharmonic
Magnetic field will necessarily to main winding produce interference phenomenon, therefore cannot find in the generator of the phase of 42 groove, 4 pole 35 subharmonic windings with
The orthogonal arrangement without electromagnetic interference of main winding.
According to above-mentioned（One）、（Two）Analysis and calculating, illustrate the scheme of this enforcement concrete mode method, the seventh harmonic winding
Really without electromagnetic interference between main winding, and（Three）Calculation specifications the present embodiment in should not adopt quintuple harmonic excitation really
Mode.
As shown in figure 3, U in stator 1, V, W, N are main generator three-phase main winding, parallel branch number a=2, three-phase and four-line draws
Go out, a7, b7, c7For three-phase the seventh harmonic winding, main winding and the seventh harmonic winding are with in the stator core slot of main generator
In；Z1For three-phase full wave rectifier circuit, E1E2For the stator excitation winding of exciter；In rotor 2, F1F2Salient pole for main generator turns
Sub- Exciting Windings for Transverse Differential Protection, a, b, c be exciter rotor three-phase symmetric winding, Z2For three-phase full wave rectifier circuit, R is piezo-resistance, whole
Generator is coaxially made up of a platform convex pole field-rotatable type main generator and the machine of a platform convex pole pivot-rotatable type AC exciter two.It is this
It is main generator and the machine coaxial configuration of AC exciter two in the seventh harmonic excitation brushless synchronous generator structure, but its electrical resistance
Can be better than fundamental wave excitation mode or third harmonic excitation mode two machine coaxial configurations no-brush synchronous generator it is electric
Performance, also overcoming should not adopt the defect of quintuple harmonic excitation in the groove of stator 42, the no-brush synchronous generator of the phase of 4 pole 3.
Therefore specific embodiment, reach the purpose of invention.
Claims (1)
1. a kind of the seventh harmonic excitation brushless synchronous generator, is mainly coaxially made up of main generator and the machine of AC exciter two,
Take from the three-phase the seventh harmonic winding Jing in main generator unit stator iron core in the DC excitation source of AC exciter magnetic pole of the stator winding
The dc source of rectifier rectification；It is characterized in that：The groove of generator unit stator 42, the pole of number of poles 4, the phase of the number of phases 3, main generator turns
Son makes overall salient type, there is even air gap between stator and rotor, and pole embrace is 0.8；Generator main winding be fractional-slot not
Deng the concentric double layer winding of circle, by 6 identical coil groups three-phase symmetric winding is formed, parallel branch number is a=2, per by
Two coil groups are in parallel, and each coil group is made up of seven coils, and seven coils are made up of the coil of two parts concentric type again, the
A part has four ceoncentrically wound coils, and coil pitch is followed successively by from big to small 10,8,6,4, and the number of turn of each coil is from big to small
It is followed successively by 8,6,4,1, Part II there are 3 concentric coils, coil pitch is followed successively by from big to small 9,7,5, and each coil
The number of turn be followed successively by 7,5,2 from big to small；The pitch of three-phase the seventh harmonic winding is 1, and number of poles is 7 times of main winding number of poles, i.e.,
Number of poles is 28 poles, is the 3 symmetrical Single-layer Windings for equidistantly waiting circle；Without the seventh harmonic content in main winding, in the seventh harmonic winding
Without fundamental wave content, without electromagnetic interference between the seventh harmonic winding and main winding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410803676.4A CN104506004B (en) | 2014-12-23 | 2014-12-23 | Seventh-harmonic excitation brushless synchronous generator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410803676.4A CN104506004B (en) | 2014-12-23 | 2014-12-23 | Seventh-harmonic excitation brushless synchronous generator |
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| CN104506004B true CN104506004B (en) | 2017-05-10 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5783891A (en) * | 1993-03-02 | 1998-07-21 | Siemens Aktiengesellschaft | Brushless synchronous machine |
| CN2532615Y (en) * | 2002-03-20 | 2003-01-22 | 清华泰豪科技股份有限公司 | Multi-wave mixing-exciting inner-source filter brushless three-phase synchronous generator |
| CN101562382A (en) * | 2009-05-27 | 2009-10-21 | 泰豪科技股份有限公司 | Quintuple harmonic excitation brushless synchronous generator |
| CN204334266U (en) * | 2014-12-23 | 2015-05-13 | 泰豪科技股份有限公司 | A kind of the seventh harmonic excitation brushless synchronous generator |
-
2014
- 2014-12-23 CN CN201410803676.4A patent/CN104506004B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5783891A (en) * | 1993-03-02 | 1998-07-21 | Siemens Aktiengesellschaft | Brushless synchronous machine |
| CN2532615Y (en) * | 2002-03-20 | 2003-01-22 | 清华泰豪科技股份有限公司 | Multi-wave mixing-exciting inner-source filter brushless three-phase synchronous generator |
| CN101562382A (en) * | 2009-05-27 | 2009-10-21 | 泰豪科技股份有限公司 | Quintuple harmonic excitation brushless synchronous generator |
| CN204334266U (en) * | 2014-12-23 | 2015-05-13 | 泰豪科技股份有限公司 | A kind of the seventh harmonic excitation brushless synchronous generator |
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| CN104506004A (en) | 2015-04-08 |
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