CN204465291U - A kind of vscf generator - Google Patents
A kind of vscf generator Download PDFInfo
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- CN204465291U CN204465291U CN201520083084.XU CN201520083084U CN204465291U CN 204465291 U CN204465291 U CN 204465291U CN 201520083084 U CN201520083084 U CN 201520083084U CN 204465291 U CN204465291 U CN 204465291U
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Abstract
The utility model relates to a kind of generator, particularly relate to a kind of input speed variable, the generator that output current frequency is constant, comprise engine block, described engine block top is provided with exciter, described engine block comprises generator amature, generator magnetic pole, generator stator bar, generator stator lead-out wire, alternator shaft and generator magnetic pole lead-out wire, described exciter comprises exciter rotatable parts, armature of exciter, exciter magnetic pole, exciter field leads and exciter rotating shaft, described exciter rotating shaft is connected with alternator shaft, the output lead of described armature of exciter goes between with generator magnetic pole and is connected, the excitation of described exciter magnetic pole is input as power frequency square wave current.The beneficial effects of the utility model are, rotary speed of generator group can adjust at any time according to prime mover optimized rotating speed, and keeps the electric current of constant frequency to export, and energy utilization rate is maximized, and generator has the advantage of brushless excitation simultaneously.
Description
Technical field
The utility model relates to a kind of generator, particularly relates to the generator that a kind of input speed is variable, output current frequency is constant.
Background technology
Generation current machine uses DC excitation electric current, and it exports constant frequency electric current needs constant rotating speed, namely needs to run under synchronous speed.But prime mover to reach under different initial conditions optimum efficiency state run time rotating speed and non-constant, be generally the power frequency that generator is sent constant, and prime mover is also run under constant rotational speed, such energy utilization rate just can not maximize, and causes certain waste;
And general excitation unit output is direct current, and variable speed constant frequency motor excitation needs to use square wave current, and thus current excitation unit can not meet variable speed constant frequency motor excitation needs.
Utility model content
Adopt salient-pole structure generator to export constant frequency electric current must to run under synchronous speed and the shortcoming that makes the necessary invariablenes turning speed of prime mover to overcome current rotor, the utility model provide a kind of can output variable speed constant frequency motor excitation need square wave current, the generator that constant frequency electric current exports can be met under can meeting asynchronous rotating speed, generating unit speed runs under can having the rotating speed of optimum efficiency according to prime mover, and using energy source is maximized.
The utility model solves the technical scheme that its technical problem adopts: a kind of vscf generator, comprise engine block, described engine block top is provided with exciter, described engine block comprises generator amature, generator magnetic pole, generator stator bar, generator stator lead-out wire, alternator shaft and generator magnetic pole lead-out wire, described exciter comprises exciter rotatable parts, armature of exciter, exciter magnetic pole, exciter field leads and exciter rotating shaft, described exciter rotating shaft is connected with alternator shaft, the output lead of described armature of exciter goes between with generator magnetic pole and is connected, the excitation of described exciter magnetic pole is input as power frequency square wave current.
Preferably, be provided with upper bracket and lower bearing bracket outside described engine block, described exciter is connected with upper bracket.
Preferably, the logarithm of described exciter magnetic pole is identical with the logarithm of generator magnetic pole.
Preferably, described armature of exciter is gone between with generator magnetic pole and is directly connected by wire.
Preferably, excitation additional device is connected with between described exciter and pole coil of generator, described excitation additional device comprises two parallel branches, each branch road there are two series thyristors, be respectively an anode thyristor and a negative electrode thyristor, two anode thyristors share an anode, two negative electrode thyristors share a negative electrode, two common anode pole thyristor contacts connect the anode of excitation unit output, two common cathode thyristor contacts connect the negative electrode of excitation unit output, contact is drawn between the thyristor of two branch roads, connect the two ends of pole coil of generator respectively, in pole coil of generator, the sense of current is by each turn on thyristors, turn off and realize conversion.
Preferably, two common anode pole thyristors are respectively first anode thyristor and second plate thyristor, and two common cathode thyristors are respectively the first negative electrode thyristor and the second negative electrode thyristor.
Preferably, described pole coil of generator one end connects between first anode thyristor and the first negative electrode thyristor, and the pole coil of generator other end connects between second plate thyristor and the second negative electrode thyristor.
Preferably, this generator also comprises excitation rectifier device, described excitation rectifier device comprises the two groups of thyristors be connected on three-phase alternating-current supply, often organizing thyristor quantity is 6,6 thyristors form three-phase full-wave full-controlled rectifier bridges, and wherein the positive pole that exports of one group of three-phase full-wave full-controlled rectifier bridge and negative pole are organized the negative pole that three-phase full-wave full-controlled rectifier bridge exports respectively and connected as two outputs of rectifying device with positive pole with another.
Preferably, the rule alternate conduction shutoff of variable speed constant frequency motor needs pressed by two groups of three-phase full-wave full-controlled rectifier bridges, and rectifier bridge exports the square wave current of corresponding rule, adapts to variable speed constant frequency motor excitation needs.
Preferably, when only using one group of rectifier bridge, rectifying device exports direct current, can meet common synchronization motor excitation demand.
Armature of exciter of the present utility model only has wire to be directly connected between going between with generator magnetic pole, does not use brush, and without other electric component, simplified structure, saves cost.
The utility model arranges coaxial exciter on generator top, and this exciter fixed magnetic pole logarithm is identical with power generator rotor magnetic pole logarithm, and exciter magnetic pole uses power frequency square wave current to power, and armature of exciter is powered directly to generator amature.When rotatable parts are in synchronous speed, the input current of armature of exciter output and generator magnetic pole is direct current, and stator bar accepts the conversion of power frequency magnetic pole and magnetic field, and stator exports power current.When rotatable parts are not with synchronous speed, it will be synthesize square wave current by power frequency, a turn frequency that armature of exciter exports, this square wave current is carried on power generator rotor magnetic pole, pole polarity follow current Changing Pattern is changed, pole polarity changes rule and superposes with a turn frequency, thus it is constant to make stator bar accept magnetic field conversion frequency maintenance power frequency, exports power current.
The utility model adds excitation additional device also between exciter and engine block, and common excitation unit is exported direct current and changes the square wave current that variable speed constant frequency motor excitation needs into by it.The excitation needs of variable speed constant frequency motor can be met after common excitation unit adopts attachment device of the present utility model.
Add excitation rectifier device simultaneously, be made up of two groups of thyristors, often organize 6 thyristors and form three-phase full-wave full-controlled rectifier bridge, two groups of rectifier bridges export opposed polarity contact and connect, as two outputs, rule is on demand used alternatingly two rectifier bridges, can output variable speed constant frequency motor need square-wave excitation electric current; When only use wherein one group of thyristor rectifier bridge time export be direct current, common synchronization motor excitation demand can be met.
The beneficial effects of the utility model are, rotary speed of generator group can adjust at any time according to prime mover optimized rotating speed, and keeps the electric current of constant frequency to export, and energy utilization rate is maximized, and generator has the advantage of brushless excitation simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of utility model;
The each parameter of generator situation of change in time when Fig. 2 is synchronous speed in the utility model;
Fig. 3 is that the utility model medium speed is lower than each parameter of generator during synchronous speed situation of change in time;
Fig. 4 is that the utility model medium speed is higher than each parameter of generator during synchronous speed situation of change in time;
Fig. 5 is the theory diagram of excitation additional device in the utility model;
Fig. 6 is the theory diagram of excitation rectifier device in the utility model;
Fig. 7 is independent one group of turn on thyristors rectification figure of excitation rectifier device in the utility model;
Fig. 8 is two groups of thyristor alternate conduction rectification figures of excitation rectifier device in the utility model;
1. generator magnetic pole lead-in wires in figure, 2. exciter rotatable parts, 3. armature of exciter, 4. exciter field leads, 5. exciter magnetic pole, 6. exciter rotating shaft, 7. upper bracket, 8. generator amature, 9. generator magnetic pole, 10. generator stator bar, 11. generator stator lead-out wires, 12. lower bearing brackets, 13. alternator shafts, 21. first anode thyristors, 22. second negative electrode thyristors, 23. second plate thyristors, 24. first negative electrode thyristors, 25. pole coil of generator.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail, but is not the restriction to the utility model protection range.
Shown in Fig. 1, a kind of vscf generator, comprise engine block, engine block top is provided with exciter, engine block comprises generator amature 8, generator magnetic pole 9, generator stator bar 10, generator stator lead-out wire 11, alternator shaft 13 and generator magnetic pole lead-out wire 1, exciter comprises exciter rotatable parts 2, armature of exciter 3, exciter magnetic pole 5, exciter field leads 4 and exciter rotating shaft 6, exciter rotating shaft 6 is connected with alternator shaft 13, output lead and the generator magnetic pole of armature of exciter 3 go between and 1 to be connected, the excitation of exciter magnetic pole 5 is input as power frequency square wave current.Be provided with upper bracket 7 and lower bearing bracket 12 outside engine block, exciter is connected with upper bracket 7.The logarithm of exciter magnetic pole 5 is identical with the logarithm of generator magnetic pole 9.Armature of exciter 3 and generator magnetic pole are gone between and 1 to be directly connected by wire.
In the utility model, exciter rotating shaft 6 is directly connected with alternator shaft 13, makes exciter rotatable parts 2 have identical rotating speed with generator amature 8.Exciter magnetic pole 5 has identical quantity with generator magnetic pole 9.The output lead of armature of exciter 3 directly goes between with generator magnetic pole and 1 to be connected, for generator magnetic pole 9 provides exciting current.Lower bearing bracket 12 with added 7 for unit rotating part provides supporting, exciter stator comprises exciter magnetic pole 5 and is also fixed on upper bracket 7, pass into " exciter input current " shown in Fig. 2 (with Fig. 3 to exciter magnetic pole 5 by exciter field leads 4, this waveform of Fig. 4 is identical) exciting current of waveform, when unit has synchronous speed, armature of exciter 3 is by electric current constant for outbound course, namely the unidirectional current as shown in Fig. 2 " exciter output current ", now as shown in Fig. 2 " the magnetic field conversion that stator bar is corresponding " curve, frequency is power frequency, generator unit stator exports and is power current.When generating unit speed is lower than synchronous speed, as shown in Fig. 3 " conversion of armature of exciter coil side " curve, the conversion frequency of armature of exciter coil side is lower than exciter input current frequency (i.e. exciter pole polarity conversion frequency), now gained armature of exciter electric current waveform as Suo Shi Fig. 3 " exciter output current ", generator amature rotating speed is identical with exciter rotor rotating speed, namely in Fig. 3, " reversal of magnetism of generator amature entity " is consistent with " armature of exciter coil side converts " curve, thus " magnetic field that stator bar the is corresponding converts " curve obtained by " exciter output current " curve and " reversal of magnetism of generator amature entity " curve phase compound has work frequency, thus generator unit stator exports as power current.Figure 4 shows that the situation of rotating speed higher than synchronous speed, conversion process is identical lower than the principle exporting power current during synchronous speed with generating unit speed.
Fig. 2-4 respectively illustrates unit and is in synchronous speed, generating unit speed lower than synchronous speed, generating unit speed higher than in synchronous speed situation, generator keep power current export, from exciter input current waveform, excitation armature output current wave, generator rotor field rule of conversion, to generator unit stator electric current export process.
As shown in Figure 5, excitation additional device is connected with between described exciter and pole coil of generator, described excitation additional device comprises two parallel branches, each branch road there are two series thyristors, be respectively an anode thyristor and a negative electrode thyristor, two anode thyristors share an anode, two negative electrode thyristors share a negative electrode, two common anode pole thyristor contacts connect the anode of excitation unit output, two common cathode thyristor contacts connect the negative electrode of excitation unit output, contact is drawn between the thyristor of two branch roads, connect the two ends of pole coil of generator 25 respectively, in pole coil of generator 25, the sense of current is by each turn on thyristors, turn off and realize conversion.Two common anode pole thyristors are respectively first anode thyristor 21 and second plate thyristor 23, two common cathode thyristors are respectively the first negative electrode thyristor 24 and the second negative electrode thyristor 22.Pole coil of generator 25 one end connects between first anode thyristor 21 and the first negative electrode thyristor 24, and pole coil of generator 25 other end connects between second plate thyristor 23 and the second negative electrode thyristor 22.
When the utility model uses, first anode thyristor 1, second plate thyristor 3 common anode pole lead contact are labeled as "+", second negative electrode thyristor 2, first negative electrode thyristor 4 common cathode lead contact is labeled as "-", between first anode thyristor 1, first negative electrode thyristor 4, lead-out wire contact is labeled as " A ", between second plate thyristor 3, second negative electrode thyristor 2, lead-out wire contact is labeled as " B ", "+" connects the anode that excitation unit exports, "-" connects the negative electrode that excitation unit exports, and " A ", " B " connect the two ends of pole coil of generator 5 respectively.Under second plate thyristor 3, first negative electrode thyristor 4 off state, first anode thyristor 1, second negative electrode thyristor 2 is triggering and conducting simultaneously, and exciter current of generator is flowed to " B " through pole coil of generator 5 by " A ".The while of first anode thyristor 1, second negative electrode thyristor 2 under off state, second plate thyristor 3, first negative electrode thyristor 4 triggering and conducting, motor energization current is flowed to " A " through pole coil of generator 5 by " B ".First anode thyristor 1, second negative electrode thyristor 2 is one group, second plate thyristor 3, first negative electrode thyristor 4 is one group, conducting or the shutoff of the thyristor often organized are kept strokes, and the action between two groups is contrary: namely one group closes another group conducting at once of having no progeny.Two groups of thyristors replace shutoff, conducting, for the pole coil of variable speed constant frequency motor provides square wave current by motor excitation requirement rule.One group leader's phase conducting, another group leader's phase can be synchronous operation common electric machine pole coil and power when turning off.
As shown in figs 6-8, this generator also comprises excitation rectifier device, described excitation rectifier device comprises the two groups of thyristors be connected on three-phase alternating-current supply, often organizing thyristor quantity is 6,6 thyristors form three-phase full-wave full-controlled rectifier bridges, and wherein the positive pole that exports of one group of three-phase full-wave full-controlled rectifier bridge and negative pole are organized the negative pole that three-phase full-wave full-controlled rectifier bridge exports respectively and connected as two outputs of rectifying device with positive pole with another.The rule alternate conduction shutoff of variable speed constant frequency motor needs pressed by two groups of three-phase full-wave full-controlled rectifier bridges, and rectifier bridge exports the square wave current of corresponding rule, adapts to variable speed constant frequency motor excitation needs.When only using one group of rectifier bridge, rectifying device exports direct current, can meet common synchronization motor excitation demand.
As shown in Figure 6, thyristor 1-6 is one group of thyristor (M group), thyristor 1,3,5 common cathode, thyristor 2,4,6 common anode pole, and forming Q is "+" pole, and P is the three-phase full-wave all controlled rectifier circuit of "-" pole.Thyristor 1 '-6 ' be one group of thyristor (N group), thyristor 1 ', 3 ', 5 ' common cathode, thyristor 2 ', 4 ', 6 ' common anode pole, forming P is "+" pole, and Q is the three-phase full-wave all controlled rectifier circuit of "-" pole.
In Fig. 7, (1) be three-phase alternating-current supply figure, (M) be M group turn on thyristors order, (2) be only use M group scr rectification circuit time rectifying device output pattern, (N) be N group turn on thyristors order, (3) are rectifying device output pattern when only using N group scr rectification circuit.Only use during M or N mono-group of thyristor and can meet common synchronization motor excitation needs
In Fig. 8, (1) be three-phase alternating-current supply figure, (M) be M group turn on thyristors order, (N) be N group turn on thyristors order, (M) represent that this place's thyristor of corresponding period turns off to shaded side in (N), non-shadow place represents this place's turn on thyristors of corresponding period, and (2) are the rectifying device output pattern under corresponding (M) (N) conducting, shutoff rule.By adjustment (M) and (N) two groups of conductings, turn off rule, the UQP square wave obtaining corresponding rule exports, and meets variable speed constant frequency motor excitation demand.
Excitation rectifier device of the present utility model can export square wave current or unidirectional current as required, meets variable speed constant frequency motor or synchronous machinery excitation needs, can be the excitation rectifier device that variable speed constant frequency motor provides exciting current.
Claims (10)
1. a vscf generator, comprise engine block, it is characterized in that: described engine block top is provided with exciter, described engine block comprises generator amature, generator magnetic pole, generator stator bar, generator stator lead-out wire, alternator shaft and generator magnetic pole lead-out wire, described exciter comprises exciter rotatable parts, armature of exciter, exciter magnetic pole, exciter field leads and exciter rotating shaft, described exciter rotating shaft is connected with alternator shaft, the output lead of described armature of exciter goes between with generator magnetic pole and is connected, the excitation of described exciter magnetic pole is input as power frequency square wave current.
2. vscf generator according to claim 1, is characterized in that: be provided with upper bracket and lower bearing bracket outside described engine block, and described exciter is connected with upper bracket.
3. vscf generator according to claim 1, is characterized in that: the logarithm of described exciter magnetic pole is identical with the logarithm of generator magnetic pole.
4. vscf generator according to claim 1, is characterized in that: described armature of exciter is gone between with generator magnetic pole and is directly connected by wire.
5. vscf generator according to claim 1, it is characterized in that: between described exciter and pole coil of generator, be connected with excitation additional device, described excitation additional device comprises two parallel branches, each branch road there are two series thyristors, be respectively an anode thyristor and a negative electrode thyristor, two anode thyristors share an anode, two negative electrode thyristors share a negative electrode, two common anode pole thyristor contacts connect the anode of excitation unit output, two common cathode thyristor contacts connect the negative electrode of excitation unit output, contact is drawn between the thyristor of two branch roads, connect the two ends of pole coil of generator respectively, in pole coil of generator, the sense of current is by each turn on thyristors, turn off and realize conversion.
6. a kind of vscf generator according to claim 5, is characterized in that: two common anode pole thyristors are respectively first anode thyristor and second plate thyristor, and two common cathode thyristors are respectively the first negative electrode thyristor and the second negative electrode thyristor.
7. a kind of vscf generator according to claim 6, it is characterized in that: described pole coil of generator one end connects between first anode thyristor and the first negative electrode thyristor, and the pole coil of generator other end connects between second plate thyristor and the second negative electrode thyristor.
8. a kind of vscf generator according to claim 1, it is characterized in that: this generator also comprises excitation rectifier device, described excitation rectifier device comprises the two groups of thyristors be connected on three-phase alternating-current supply, often organizing thyristor quantity is 6,6 thyristors form three-phase full-wave full-controlled rectifier bridges, and wherein the positive pole that exports of one group of three-phase full-wave full-controlled rectifier bridge and negative pole are organized the negative pole that three-phase full-wave full-controlled rectifier bridge exports respectively and connected as two outputs of rectifying device with positive pole with another.
9. a kind of vscf generator according to claim 8, it is characterized in that: two groups of three-phase full-wave full-controlled rectifier bridges turn off by the rule alternate conduction of variable speed constant frequency motor needs, rectifier bridge exports the square wave current of corresponding rule, adapts to variable speed constant frequency motor excitation needs.
10. a kind of vscf generator according to claim 9, is characterized in that: when only using one group of rectifier bridge, rectifying device exports direct current, can meet common synchronization motor excitation demand.
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| CN201520083084.XU CN204465291U (en) | 2015-02-06 | 2015-02-06 | A kind of vscf generator |
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| CN201520083084.XU CN204465291U (en) | 2015-02-06 | 2015-02-06 | A kind of vscf generator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104617729A (en) * | 2015-02-06 | 2015-05-13 | 浙江富春江水电设备有限公司 | Variable-speed constant-frequency generator |
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2015
- 2015-02-06 CN CN201520083084.XU patent/CN204465291U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104617729A (en) * | 2015-02-06 | 2015-05-13 | 浙江富春江水电设备有限公司 | Variable-speed constant-frequency generator |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150708 Termination date: 20180206 |