CN201490958U - Excitation device of generator - Google Patents
Excitation device of generator Download PDFInfo
- Publication number
- CN201490958U CN201490958U CN2009201395489U CN200920139548U CN201490958U CN 201490958 U CN201490958 U CN 201490958U CN 2009201395489 U CN2009201395489 U CN 2009201395489U CN 200920139548 U CN200920139548 U CN 200920139548U CN 201490958 U CN201490958 U CN 201490958U
- Authority
- CN
- China
- Prior art keywords
- circuit
- input
- output
- resistance
- voltage comparator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Control Of Electric Motors In General (AREA)
Abstract
The utility model discloses an excitation device of a generator, comprising a main power circuit, an input circuit, a voltage measurement circuit, a comparison circuit and a control circuit. The control circuit comprises a power input terminal, a control input terminal and a control output terminal, wherein the control output terminal supplies current for the excitation coil of the generator; the power input terminal is connected with the power output terminal of the main power circuit; the control input terminal is connected with the output terminal of the comparison circuit; the first input terminal of the comparison circuit is connected with the output terminal of the voltage measurement circuit; the input terminal of the voltage measurement circuit is connected with the output terminal of the input circuit; the input terminal of the input circuit is connected with the output coil of the generator; the excitation device comprises a frequency measurement circuit, wherein the input terminal of the frequency measurement circuit is connected with the output terminal of the input circuit, the output terminal of the frequency measurement circuit is connected with the second input terminal of the comparison circuit, and the frequency measurement circuit is provided with given frequency. The excitation device leads the excitation of the generator during overloading to be reduced and voltage reduced, but the frequency is slightly decreased, and frequency stabilization and protection during overloading is realized.
Description
Technical field
The utility model relates to a kind of circuit, particularly relates to a kind of generator excitation unit.
Background technology
Generator is widely used in social all trades and professions as stand-by power supply.Generator generally comprises peripheral stator and rotating rotor in stator.Have coil on the described stator, have magnet exciting coil or permanent magnetic material on the described rotor, when power source made the rotor rotation, the magnetic field that the coil cutting rotor on the stator produces made the coil on the stator produce voltage.Change epitrochanterian drive current, can change the stator output voltage on the generator just.
Generally, need be equipped with excitation unit, provide driving power, to control epitrochanterian drive current and then the output of control generator to the magnet exciting coil on the described generator amature for epitrochanterian coil in order can continuous and effective to operate.The prior art excitation unit generally comprises main power circuit and control circuit.
Excessive in load, when causing described generator overload to occur, this moment, generator speed descended, its voltage also descends.Simultaneously, excitation unit can be exported with maximum current, causes the rotor of generator or excitation unit to burn out.
Transship for fear of generator; prior art also provides overload protecting circuit; described overload protecting circuit is measured the output current of described generator; when causing the generator output current to rise to a certain degree owing to overload; cut off the output of described generator, realizing the effect of protection generator, but because during overload; the unit electric current rises few and is failure to actuate, and does not often reach the purpose of protection.
The utility model content
The technical problem that the utility model mainly solves provides a kind of generator excitation unit, can protect motor to be unlikely to and damage because of overload, realizes overload frequency stabilization protection.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of generator excitation unit is provided, and it comprises main power circuit, input circuit, tension measuring circuit, comparison circuit and control circuit; Described control circuit comprises power input, control input end and control output end, described control output end provides electric current for the magnet exciting coil of generator, described power input connects the power output end of described main power circuit, and described control input end connects described comparison circuit output; The first input end of described comparison circuit connects the output of described tension measuring circuit; The described input circuit output of described tension measuring circuit input termination; Described input circuit input sending and receiving motor output winding; Comprise frequency measurement circuit, the described input circuit output of its input termination, described comparison circuit second input of its output termination, described frequency measurement circuit itself is provided with given frequency.
The beneficial effects of the utility model are: when the utility model is lower than given frequency certain amplitude at the output frequency of main power circuit; the output of described frequency measurement circuit descends; cause the control circuit output current to descend; the protection motor is unlikely to damage because of overload; comparator first input end voltage follow descends simultaneously, and the first input end and second input finally reach balance, and generator output voltage is descended; the machine class frequency of keeping can excessive descent, realizes overload frequency stabilization protection.
Description of drawings
Fig. 1 is the theory diagram of the utility model generator excitation unit;
Fig. 2 is the physical circuit module frame chart of generator excitation unit among Fig. 1;
Fig. 3 is the physical circuit figure of generator excitation unit among Fig. 2.
Embodiment
Consult Fig. 1, the utility model generator excitation unit comprises:
Main power circuit, input circuit, tension measuring circuit, comparison circuit and control circuit;
Described control circuit comprises power input, control input end and control output end, described control output end provides electric current for the magnet exciting coil of generator, described power input connects the power output end of described main power circuit, and described control input end connects described comparison circuit output;
The first input end of described comparison circuit connects the output of described tension measuring circuit;
The described input circuit output of described tension measuring circuit input termination;
Described input circuit input sending and receiving motor output winding;
Comprise frequency measurement circuit, the described input circuit output of its input termination, it exports termination
Described comparison circuit second input, described frequency measurement circuit itself is provided with given frequency.
In the foregoing circuit work; when the ripple frequency of input is greater than or equal to the given frequency of frequency measurement circuit; frequency measurement circuit output constant reference voltage; when the ripple frequency of input is lower than given frequency certain amplitude; output voltage is less than reference voltage; the output voltage of described comparison circuit is descended; cause control circuit output to descend; the protection motor is unlikely to damage because of overload; comparator first input end voltage follow descends simultaneously; the first input end and second input finally reach balance, and keeping the electric moter voltage frequency can excessive descent, realize overload frequency stabilization protection.
That is to say that when being lower than given frequency in the unit overload, device reduces exciting current, and unit voltage is descended, and frequency keeps stable.
Consult Fig. 2, in the specific embodiment, described frequency measurement circuit comprises first shaping circuit, differential circuit, second shaping circuit, first filter circuit and the 3rd shaping circuit and second filter circuit that connects successively.The described input circuit output of the input termination of described first shaping circuit, the output of described the 3rd shaping circuit connects second input of described comparison circuit behind second filter circuit, and by voltage-stabiliser tube ground connection, the plus earth of described voltage-stabiliser tube.
The given frequency of described frequency measurement circuit itself can be a little less than the rated frequency of input circuit output.
Consult Fig. 3 together, described first shaping circuit comprises voltage comparator spare IC1, the negative input end of IC1 connects power Vcc by resistance R 1, and by resistance R 2 ground connection, the positive input terminal of IC1 connects the output of described input circuit by resistance R 3, resistance R 4, and positive input terminal is also by resistance R 5 ground connection;
Described differential circuit comprises continuous capacitor C 1 and resistance R 6, capacitor C 1 another termination IC1 output, resistance R 6 other end ground connection;
Described second shaping circuit comprises voltage comparator spare IC2, and the negative input end of IC2 connects the negative input end of IC1, between positive input terminal connecting resistance R6 and the capacitor C 1;
Described first filter circuit comprises continuous resistance R 7 and capacitor C 2, the output of another termination IC2 of resistance R 7, capacitor C 2 other end ground connection;
Described the 3rd shaping circuit comprises voltage comparator spare IC3, and the negative input end of IC3 connects the negative input end of IC1, and positive input terminal is connected between resistance R 7 and the capacitor C 2;
Described second filter circuit comprises resistance R 8, R9, C3; R8, R9, C3 one end connect another termination of R8 IC3 output altogether, C3 other end ground connection, and described comparison circuit IC4 second input of another termination of R9, simultaneously by voltage-stabiliser tube D1 ground connection, D1 plus earth;
Wherein, second input of IC4 is a negative input end, and first input end is a positive input terminal.
In the foregoing circuit work; when the ripple frequency of input is greater than or equal to the given frequency of frequency measurement circuit; voltage-stabiliser tube D1 punctures the output constant reference voltage; when the ripple frequency of input is lower than given frequency certain amplitude; output voltage is less than reference voltage; the output voltage of described comparator device IC4 is descended; cause control circuit output to descend; the protection motor is unlikely to damage because of overload; comparator device IC4 first input end voltage follow descends simultaneously; the first input end and second input finally reach balance, and keeping the electric moter voltage frequency can excessive descent, realize overload frequency stabilization protection.
The above only is embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (4)
1. generator excitation unit comprises:
Main power circuit, input circuit, tension measuring circuit, comparison circuit and control circuit;
Described control circuit comprises power input, control input end and control output end, described control output end provides electric current for the magnet exciting coil of generator, described power input connects the power output end of described main power circuit, and described control input end connects described comparison circuit output;
The first input end of described comparison circuit connects the output of described tension measuring circuit;
The described input circuit output of described tension measuring circuit input termination;
Described input circuit input sending and receiving motor output winding;
It is characterized in that,
Comprise frequency measurement circuit, the described input circuit output of its input termination, described comparison circuit second input of its output termination, described frequency measurement circuit itself is provided with given frequency.
2. generator excitation unit according to claim 1, it is characterized in that: described frequency measurement circuit comprises first shaping circuit, differential circuit, second shaping circuit, first filter circuit and the 3rd shaping circuit and second filter circuit that connects successively, the described input circuit output of the input termination of described first shaping circuit, the output of described the 3rd shaping circuit connects second input of described comparison circuit behind second filter circuit, and by voltage-stabiliser tube ground connection, the plus earth of described voltage-stabiliser tube.
3. generator excitation unit according to claim 2 is characterized in that: the given frequency of described frequency measurement circuit itself is lower than the rated frequency of generating set.
4. generator excitation unit according to claim 2 is characterized in that:
Described first shaping circuit comprises the first voltage comparator spare (IC1), the negative input end of the first voltage comparator spare connects power supply (Vcc) by first resistance (R1), and by second resistance (R2) ground connection, the positive input terminal of the first voltage comparator spare (IC1) connects the output of described input circuit by the 4th resistance (R4), and positive input terminal is also by the 5th resistance (R5) ground connection;
Described differential circuit comprises continuous first electric capacity (C1) and the 6th resistance (R6), another termination first voltage comparator spare (IC1) output of first electric capacity (C1), the 6th resistance (R6) other end ground connection;
Described second shaping circuit comprises the second voltage comparator spare (IC2), and the negative input end of the second voltage comparator spare (IC2) connects the negative input end of the first voltage comparator spare (IC1), between positive input termination first resistance (R6) and first electric capacity (C1);
Described first filter circuit comprises continuous the 7th resistance (R7) and second electric capacity (C2), the output of another termination second voltage comparator spare (IC2) of the 7th resistance (R7), second electric capacity (C2) other end ground connection;
Described the 3rd shaping circuit comprises tertiary voltage comparator device (IC3), and the negative input end of tertiary voltage comparator device (IC3) connects the negative input end of the first voltage comparator spare (IC1), and positive input terminal is connected between the 7th resistance (R7) and second electric capacity (C2);
Described second filter circuit comprises resistance the 8th resistance (R8), the 9th resistance (R9) and the 3rd electric capacity (C3); The 8th resistance (R8), the 9th resistance (R9) and the 3rd electric capacity (C3) end connect altogether, another termination tertiary voltage comparator device (IC3) output of the 8th resistance (R8), the 3rd electric capacity (C3) other end ground connection, the described comparison circuit of another termination of the 9th resistance (R9) (IC4) second input, pass through described voltage-stabiliser tube (D1) ground connection, voltage-stabiliser tube (D1) plus earth simultaneously;
Wherein, second input of described comparison circuit (IC4) is a negative input end, and first input end is a positive input terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201395489U CN201490958U (en) | 2009-07-23 | 2009-07-23 | Excitation device of generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201395489U CN201490958U (en) | 2009-07-23 | 2009-07-23 | Excitation device of generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201490958U true CN201490958U (en) | 2010-05-26 |
Family
ID=42429824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201395489U Expired - Fee Related CN201490958U (en) | 2009-07-23 | 2009-07-23 | Excitation device of generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201490958U (en) |
-
2009
- 2009-07-23 CN CN2009201395489U patent/CN201490958U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201490958U (en) | Excitation device of generator | |
| CN201345572Y (en) | Flameproof and intrinsically safe variable frequency motor | |
| CN101572525B (en) | Generator excitation unit | |
| Im et al. | Torque maximization control of 3-phase BLDC motors in the high speed region | |
| CN203522150U (en) | Protection circuit used for brushless DC motor and brushless DC motor | |
| CN204633666U (en) | A kind of electric tool High speed SRM control device | |
| CN202978255U (en) | Outer rotor electronic control type fan overvoltage protection circuit | |
| CN203911835U (en) | Stringing type motor vehicle-used frequency converter | |
| CN201490957U (en) | Excitation device of generator | |
| CN203057050U (en) | Electromagnetic torque ripple inhibition device for brushless direct current motor | |
| CN2388770Y (en) | Double-disk magnetoelectric generator | |
| CN201910722U (en) | Direct drive motor for sand making machine | |
| CN102801274A (en) | Electronic commutation electrically excited direct current motor | |
| CN206490610U (en) | A kind of motor circuit of use closed-loop pulse width PWM speed regulating controls | |
| CN2390349Y (en) | Controllable plastic sealed brushless DC motor | |
| CN201608517U (en) | Motor overload protection circuit | |
| CN202300963U (en) | Dual-frequency-conversion air compressor unit | |
| CN202152721U (en) | Solar water pump using permanent magnetic synchronous motor | |
| CN204836013U (en) | Converter exciting arrangement is directly driven to high -power electric excitation | |
| CN103036207B (en) | Electronic control type fan of outer rotor overvoltage protection alignment circuit and over-voltage protection method | |
| CN203398889U (en) | Conical voltage-stabilizing wind power generator | |
| CN208128016U (en) | A kind of permanent magnet machine rotor slackening cogging torque | |
| CN104078927A (en) | Lamp driving undervoltage alarm circuit | |
| CN212163121U (en) | Energy-saving efficient intelligent driving permanent magnet motor | |
| CN201388137Y (en) | Novel permanent-magnet voltage stabilization generator |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100526 Termination date: 20180723 |