CN203466768U - Phase advancer capable of automatically regulating voltage - Google Patents
Phase advancer capable of automatically regulating voltage Download PDFInfo
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- CN203466768U CN203466768U CN201320562153.6U CN201320562153U CN203466768U CN 203466768 U CN203466768 U CN 203466768U CN 201320562153 U CN201320562153 U CN 201320562153U CN 203466768 U CN203466768 U CN 203466768U
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Abstract
The utility model provides a phase advancer capable of automatically regulating the voltage, and belongs to the technical field of reactive power compensation of motors. The phase advancer mainly solves the problem, existing in a present multiple-contact compensation transformer, that the compensation voltage cannot be selected and changed according to changes of a motor load. The phase advancer is characterized in that: the phase advancer comprises a keyboard, a display screen, a motor stator current transducer, a controller, a rotor current sensor, an AC-AC frequency changer circuit, a trigger control circuit, a compensation transformer and a phase advancing and retreating mechanism; the AC-AC frequency changer circuit is connected with a secondary side of the compensation transformer, the trigger control circuit and the phase advancing and retreating mechanism; a primary side of the compensation transformer is connected with an auxiliary power supply; and the phase advancing and retreating mechanism is connected with a motor to be controlled. The phase advancer is advantageous in that: the compensation voltage can be changed according to changes of working conditions, an overall compensation effect of the phase advancer is improved, and a range of application of the phase advancer is broadened; and the phase advancer is mainly applied to an occasion that variable-voltage compensation is performed on a wound-rotor synchronous motor under various different conditions to improve motor power factors.
Description
Technical field
The utility model belongs to motor Technique of Compensating Capacitance for Reactive field, is specifically related to a kind of phase advancer that can carry out to the wire-wound asynchronous motor under various different operating modes variable voltage compensation raising motor power factor.
Background technology
In China, the features of the big-and-middle-sized wire-wound asynchronous motor operation of using in each enterprise production process is to load on ceaselessly to change, the power factor of motor also changes accordingly simultaneously, the motor of part occasion particularly, in dragged equipment, equipment moves always under idle running and the condition that constantly replaces of load, corresponding motor is the alternation state in idle running and load always, motor power factor wide fluctuations, when using phase advancer to carry out reactive power compensation, require can export different bucking voltages under different loading conditions, motor power factor is kept in the preferred range always.
Existing phase advancer adopts multiple-contact compensator transformer, by connecing different transformer contacts, change the value of bucking voltage, and then the compensation effect of adjustment phase advancer, under this mode, a corresponding motor can only be selected a kind of bucking voltage value, can not select to change bucking voltage according to the variation of motor load, causes phase advancer can only adapt to the reactive compensation requirements under Part load, under partial status, compensation effect does not reach requirement, has limited the range of application of phase advancer.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, a kind of phase advancer that can adjust output bucking voltage is provided, according to load variations, under different control models, export variable backoff voltage, make motor under various loads, all can reach desirable reactive power compensation effect.
For achieving the above object, the technical solution adopted in the utility model is: a kind of phase advancer of automatic Regulation, comprises keyboard and display screen, motor stator current transducer, controller, rotor current transducer, trigger control circuit, compensator transformer, advance and retreat phase mechanism; It is characterized in that: described motor stator current transducer is connected with the stator current coil of motor to be controlled; Described rotor current transducer is connected with the rotor current coil of three phase windings of motor to be controlled; Also comprise ac/ac frequency converter, this ac/ac frequency converter is connected with advance and retreat phase mechanism with described compensator transformer time limit, trigger control circuit, and the former limit of compensator transformer is connected with accessory power supply, and advance and retreat phase mechanism is connected with motor to be controlled.
The former limit of compensator transformer described in the technical solution adopted in the utility model only has one group of contact, its output voltage is constant, unlike the prior art, in prior art, compensator transformer has many group contacts, by connecing different contacts, change the output voltage of compensator transformer, thereby change, be attached to the voltage on rotor winding, the utility model changes the Trig control signal of AC/AC (alternating current) variable-frequency by controller, at compensator transformer, export constant in the situation that and change and be attached to the voltage on rotor winding.
Controller described in the technical solution adopted in the utility model is by first microprocessor, micro-the second processor, motor stator current signal translation circuit, motor stator voltage signal conversion circuit, rotor current amplitude signal translation circuit, dephasign signal input translation circuit, enter phase signals input translation circuit, the complete signal input of electric motor starting translation circuit, rotor current phase signal translation circuit, enter phase output signal translation circuit, dephasign output signal translation circuit, fault dephasign output signal translation circuit, RS232 communicating circuit with display panel, outside RS485 communicating circuit, synchronizing signal translation circuit, Trig control signal translation circuit forms.First microprocessor respectively with motor stator current signal translation circuit, motor stator voltage signal conversion circuit, rotor current amplitude signal translation circuit, dephasign signal input translation circuit, enter phase signals input translation circuit, the complete signal input of electric motor starting translation circuit, rotor current phase signal translation circuit, enter phase output signal translation circuit, dephasign output signal translation circuit, fault dephasign output signal translation circuit, RS232 communicating circuit with display panel, outside RS485 communicating circuit connects, the second microprocessor is connected with rotor current phase signal translation circuit, synchronizing signal translation circuit, Trig control signal translation circuit respectively, first microprocessor is connected with the second microprocessor.
The utility model is owing to adopting by keyboard and display screen, motor stator current transducer, controller, rotor current transducer, trigger control circuit, compensator transformer, ac/ac frequency converter, the phase advancer of a kind of automatic Regulation that advance and retreat phase mechanism forms, wherein motor stator current transducer is connected with the stator current coil of motor to be controlled, rotor current transducer is connected with the rotor current coil of three phase windings of motor to be controlled, ac/ac frequency converter and described compensator transformer, trigger control circuit is connected with advance and retreat phase mechanism, the output of AC/AC (alternating current) variable-frequency is connected with the rotor winding of motor to be controlled, thereby motor stator current transducer can detect the motor stator current in when operation, rotor current transducer can detect the current signal of rotor three phase windings, keyboard and display screen arrange light load compensation magnitude of voltage and heavily loaded bucking voltage value, controller is according to motor stator current signal and rotor current sensor signal, motor operating condition is divided into underloading and heavily loaded two states, the three-phase compensation voltages of exporting during underloading is direct voltage, direction is always constant, during heavy duty, exporting control signal makes ac/ac frequency converter by the accessory power supply through compensator transformer step-down by trigger control circuit, be transformed into three-phase compensation voltages, its frequency is identical with the rotor current frequency of corresponding phase, lag behind rotor current 90 degree of corresponding phase of phase place, by advance and retreat phase mechanism, be added on three phase windings of rotor to be controlled again, realize under different loading conditions and can export different bucking voltages, motor power factor is kept in the preferred range always.The utility model contrast prior art, proposed first, by keyboard and display screen, bucking voltage value is set, by controller, controlled the waveform of ac/ac frequency converter output bucking voltage, at compensator transformer output voltage amplitude, fixedly in the situation that, according to motor actual loading situation, adjust actual bucking voltage.Meanwhile, by the method, can select respectively different light load compensation voltage and heavily loaded bucking voltage, solve existing phase advancer and can only select a kind of deficiency of bucking voltage under all operating modes.The utlity model has bucking voltage can be changed according to the change of operating mode, improve the entire compensation effect of phase advancer, increase the feature of the scope of application of phase advancer.The utility model is mainly used in carrying out to the wire-wound asynchronous motor under various different operating modes the phase advancer that variable voltage compensation improves motor power factor.
Accompanying drawing explanation
Fig. 1 is the utility model execution mode schematic diagram.
Fig. 2 is compensator transformer original edge voltage schematic diagram.
Fig. 3 is compensator transformer time polygonal voltage schematic diagram.
Fig. 4 exports the 1st kind of schematic diagram of bucking voltage while being underloading.
Fig. 5 exports the 2nd kind of schematic diagram of bucking voltage while being underloading.
Fig. 6 is the bucking voltage oscillogram of additional rotor-side.
Fig. 7 is the 1st kind of A phase pressure regulation method schematic diagram.
Fig. 8 is the 1st kind of B phase pressure regulation method schematic diagram.
Fig. 9 is the 1st kind of C phase pressure regulation method schematic diagram.
Figure 10 is the 2nd kind of A phase pressure regulation method schematic diagram.
Figure 11 is the 2nd kind of B phase pressure regulation method schematic diagram.
Figure 12 is the 2nd kind of C phase pressure regulation method schematic diagram.
Figure 13 is controller hardware block diagram.
Embodiment
As shown in Figure 1, phase advancer is comprised of keyboard and display screen 11, motor stator current transducer 12, controller 13, rotor current transducer 14, trigger control circuit 15, compensator transformer 16, ac/ac frequency converter 17, advance and retreat phase mechanism 18.Stator current when motor stator current transducer 12 detects motor operation, rotor current transducer 14 detects the current signal of rotor three phase windings, keyboard and display screen 11 arrange light load compensation magnitude of voltage and heavily loaded bucking voltage value, controller 13 is according to motor stator current signal and rotor current sensor signal, output control signal is by trigger control circuit 15, make ac/ac frequency converter 17 by the accessory power supply through compensator transformer 16 step-downs, be transformed into three-phase compensation voltages, then be added on three phase windings of rotor to be controlled by advance and retreat phase mechanism 18.
As shown in figure 13, controller is by first microprocessor CPU1, the second microprocessor CPU 2, motor stator current signal translation circuit, motor stator voltage signal conversion circuit, rotor current amplitude signal translation circuit, dephasign signal input translation circuit, enter phase signals input translation circuit, the complete signal input of electric motor starting translation circuit, rotor current phase signal translation circuit, enter phase output signal translation circuit, dephasign output signal translation circuit, fault dephasign output signal translation circuit, RS232 communicating circuit with display panel, outside RS485 communicating circuit, synchronizing signal translation circuit, Trig control signal translation circuit forms.
In the utility model, motor stator current conversion circuit in controller is transformed into 0-5V signal by motor stator current transducer signal, give first microprocessor CPU1, first microprocessor CPU1 judges that motor is in underloading and heavy condition, and by status signal, give the second microprocessor CPU 2, the second microprocessor CPUs 2 and can carry the different thyristor control waveform of State-output according to weight.
Rotor current amplitude signal translation circuit in controller is transformed into 0-5V signal by rotor current sensor signal, give first microprocessor CPU1, first microprocessor CPU1 calculates the size of rotor current and rotor current size information is passed to the second microprocessor CPU 2, rotor current sensor signal is transformed into square-wave signal through rotor current phase signal translation circuit and gives the second microprocessor CPU 2, microprocessor is according to size of current and direction on the size of rotor current and each thyristor of phase determination, change the time of the leading synchronizing signal of Trig control signal.
Dephasign signal in controller input translation circuit, enter phase signals input translation circuit, the complete signal input of electric motor starting translation circuit will enter phase and dephasign instruction, electric motor starting settling signal is given first microprocessor CPU1, first microprocessor CPU1 sends control command again by entering phase, dephasign output signal translation circuit according to above signal, pass to advance and retreat phase mechanism, control entering mutually and dephasign action of phase advancer.
By keyboard and display screen 11, light load compensation voltage and heavily loaded bucking voltage can be set respectively, by RS232 communicating circuit, send to as processor CPU1, by the connection between first microprocessor CPU1 and the second microprocessor CPU 2, pass to the second microprocessor CPU 2 again, by the second microprocessor CPU 2 output thyristor pulse control signals, make AC/AC (alternating current) variable-frequency export different voltage waveforms.The bucking voltage waveform of actual output is formed by stacking by the positive and negative half-wave that compensates transformation output voltage, its effective value is determined jointly by the effective value of compensator transformer output voltage and the control waveform of controller output, in the time need to reducing the effective value of output voltage, controller output control waveform makes after n half-wave of the every output of ac/ac frequency converter, make the half-wave direction of three-phase output in next half wave cycles identical, the effective value of output voltage is equivalent to original n/(n+1), by the method, can reduce output voltage.
As shown in Figures 2 to 6, accessory power supply is transformed into corresponding voltage and appends on rotor winding after compensator transformer 16 and ac/ac frequency converter 17, and accessory power supply waveform 1 is after step-down transformer, and amplitude reduces.When motor to be controlled operates in light condition, the voltage direction being attached on motor winding to be controlled is constant, and when auxiliary voltage is timing, waveform is formed by stacking by the positive half wave of compensator transformer output voltage waveforms 2, as the waveform 3 in figure; When auxiliary voltage is when negative, waveform is formed by stacking by the negative half-wave of compensator transformer output voltage waveforms 2, as the waveform 4 in figure.When motor operates in heavy condition, rotor bucking voltage 6 is respectively by positive and negative half wave component of compensator transformer output waveform, and the frequency that positive and negative half-wave switches is identical with rotor current 5, first-harmonic 7 phase place hysteresis rotor current 90 degree of rotor bucking voltage.
As shown in Fig. 7 to Figure 12, output waveform is formed by stacking by the positive and negative half-wave of compensator transformer waveform, because compensator transformer output voltage amplitude is determined, so forming the amplitude of the half-wave of output waveform can not change, when controller passes through to change control signal, can make after the half-wave of n compensator transformer bucking voltage of the every output of ac/ac frequency converter, export identical half waveform of three-phase waveform, in n+1 half wave cycles, on rotor three-phase, export forward half-wave simultaneously or export negative sense half-wave simultaneously, in the three characteristics of the middle term, voltage swing and the direction of additional waveform are in full accord, in this half wave cycles, the voltage between three-phase is 0 always, the bucking voltage being equivalent on these half wave cycles internal rotor three phase windings is all 0, suppose that compensator transformer output voltage effective value is U, now the effective value of bucking voltage is
u, the effective value of output voltage reduces.Change the size of n value, can change the effective value of output voltage, by changing controller output control signal, just can, the in the situation that of output compensator transformer output fixed voltage, export different bucking voltages.The bucking voltage of output can change with the change with n value, and not restricted by compensator transformer output voltage.
Claims (3)
1. a phase advancer for automatic Regulation, comprises keyboard and display screen, motor stator current transducer, controller, rotor current transducer, trigger control circuit, compensator transformer, advance and retreat phase mechanism; It is characterized in that: described motor stator current transducer is connected with the stator current coil of motor to be controlled; Described rotor current transducer is connected with the rotor current coil of three phase windings of motor to be controlled; Also comprise ac/ac frequency converter, this ac/ac frequency converter is connected with advance and retreat phase mechanism with described compensator transformer time limit, trigger control circuit, and the former limit of compensator transformer is connected with accessory power supply, and advance and retreat phase mechanism is connected with motor to be controlled.
2. the phase advancer of a kind of automatic Regulation according to claim 1, is characterized in that: the former limit of described compensator transformer only has one group of contact.
3. the phase advancer of a kind of automatic Regulation according to claim 1 and 2, it is characterized in that: the first microprocessor of described controller (CPU1) respectively with motor stator current signal translation circuit, motor stator voltage signal conversion circuit, rotor current amplitude signal translation circuit, dephasign signal input translation circuit, enter phase signals input translation circuit, the complete signal input of electric motor starting translation circuit, rotor current phase signal translation circuit, enter phase output signal translation circuit, dephasign output signal translation circuit, fault dephasign output signal translation circuit, RS232 communicating circuit with display panel, outside RS485 communicating circuit connects, the second microprocessor (CPU2) is connected with rotor current phase signal translation circuit, synchronizing signal translation circuit, Trig control signal translation circuit respectively, first microprocessor (CPU1) is connected with the second microprocessor (CPU2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320562153.6U CN203466768U (en) | 2013-09-11 | 2013-09-11 | Phase advancer capable of automatically regulating voltage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320562153.6U CN203466768U (en) | 2013-09-11 | 2013-09-11 | Phase advancer capable of automatically regulating voltage |
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| Publication Number | Publication Date |
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| CN203466768U true CN203466768U (en) | 2014-03-05 |
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| CN201320562153.6U Expired - Fee Related CN203466768U (en) | 2013-09-11 | 2013-09-11 | Phase advancer capable of automatically regulating voltage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426456A (en) * | 2013-09-11 | 2015-03-18 | 万洲电气股份有限公司 | Automatic voltage-regulating phase advancer |
-
2013
- 2013-09-11 CN CN201320562153.6U patent/CN203466768U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426456A (en) * | 2013-09-11 | 2015-03-18 | 万洲电气股份有限公司 | Automatic voltage-regulating phase advancer |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140305 Termination date: 20190911 |
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| CF01 | Termination of patent right due to non-payment of annual fee |