CN201557078U - Energy-saving device for AC asynchronous motor with function of improving power factor - Google Patents
Energy-saving device for AC asynchronous motor with function of improving power factor Download PDFInfo
- Publication number
- CN201557078U CN201557078U CN2009202494212U CN200920249421U CN201557078U CN 201557078 U CN201557078 U CN 201557078U CN 2009202494212 U CN2009202494212 U CN 2009202494212U CN 200920249421 U CN200920249421 U CN 200920249421U CN 201557078 U CN201557078 U CN 201557078U
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- Prior art keywords
- bidirectional triode
- triode thyristor
- motor
- digital signal
- signal processor
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
An energy-saving device for an AC asynchronous motor with the function of improving power factor comprises a digital signal processor, a voltage transformer, a current transformer, a switching circuit, an AC contactor, a two-way controlled silicon, a power resistor, and a keyboard/ display circuit. The voltage and the current of the stator winding of the electric motor under the no-load and light load states are reduced through the method that the stator winding of the electric motor is connected with the resistor in series, and the running efficiency of the electric motor is improved. Since the main loop of the electric motor is connected with purely resistive loads in series, no pollution is caused to an electric fence.
Description
Technical field
The utility model relates to a kind of power equipment device, relates to a kind of motor energy saving devices specifically.
Background technology
Induction alternating current (AC) motor is the topmost motive power equipment of electric machinery, occupies extremely important status in the national economic development and social life.It also is the energy consumption equipment that has a large capacity and a wide range simultaneously.November 25 calendar year 2001, National Development and Reform Committee has issued China's Medium-and Long-Term Plan for Conserving Energy Resources, this is planned the energy saving motor engineering as one of key project, point out: all kinds of motor total capacities of China are about 4.2 hundred million kW, power consumption accounts for 60% of national power consumption, this shows that the power saving of resolving motor drive system has huge social benefit and market efficiency.Energy-conservation and environmental protection also is the only way that keeps economic sustainable growth.
At present, the power-saving technology of motor operation, mainly contain two big classes: a class is serial connection two-way (unidirectional) controllable silicon on motor circuit, when motor underloading or zero load, move two-way (unidirectional) controllable silicon and trigger phase place, shorten ON time, reduce motor input voltage effective value, reduce motor stator currents and reach energy-conservation purpose.Another kind of is to adopt alternating frequency conversion technique, is satisfying under the prerequisite of technological requirement, reduces motor speed and realizes energy-conservation.This two classes power-saving technology all unavoidably can produce Harmonic Interference and radio frequency interference, along with the increase of number of applications, day by day obviously makes the electrical network quality more and more poor for the influence of electrical network, even can cause the misoperation of electronic equipments such as computer, controller.
Summary of the invention
At the defective that existing motor energy saving devices exists, the motor energy saving devices that the utility model provides a kind of motor operational efficiency height, can not pollute electrical network.
Solving the problems of the technologies described above the concrete technical measures of being taked is: a kind of have an AC asynchronous motor energy saver that improves power factor, it is characterized in that: by digital signal processor, voltage transformer, current transformer, switching circuit, A.C. contactor, bidirectional triode thyristor, power resistor, keyboard/display circuit constitutes, device is at three-phase power input end (A, B, C) parallel connection A.C. contactor (5-1,5-2,5-3), the A.C. contactor output connects motor, three-phase power input end (A, B, C) parallel connection bidirectional triode thyristor (7-1,7-2,7-3), at bidirectional triode thyristor (7-1,7-2,7-3) output connects power resistor (6-1,6-2,6-3), the power resistor output connects motor, three-phase power input end (A, B, C) parallel connection power resistor (8-1,8-2,8-3), (8-3) output connects bidirectional triode thyristor (9-1 to power resistor for 8-1,8-2,9-2,9-3), bidirectional triode thyristor (9-1,9-2,9-3) output connects motor, bidirectional triode thyristor trigger switch circuit (4) output parallel connection bidirectional triode thyristor (7-1,7-2,7-3) and bidirectional triode thyristor (9-1,9-2, input 9-3), digital signal processor (1) output connects the input/output terminal of bidirectional triode thyristor trigger switch circuit (4), and digital signal processor (1) input connects voltage transformer signal output part (2), digital signal processor (1) connects current transformer (11) signal output part, and digital signal processor (1) connects keypad/display (3).
The beneficial effects of the utility model: by the method for motor stator winding crosstalk resistance, reduce voltage, the electric current of motor motor stator winding under zero load, light condition, improve the motor operational efficiency.Because motor major loop serial connection is pure resistive load, can not pollute electrical network.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
Be described with reference to the accompanying drawings structure of the present utility model.
A kind of AC asynchronous motor energy saver, as shown in Figure 1: by 16F877A type digital signal processor 1, TV10313 type voltage transformer 2, TV3240-1 type current transformer 11, JS-03B type bidirectional triode thyristor trigger switch circuit 4, A16-30-01 type A.C. contactor 5, BT136-600E type bidirectional triode thyristor 7-1,7-2,7-3,9-1,9-2,9-3, RX20-200 type power resistor 6-1,6-2,6-3,8-1,8-2,8-3, keypad/display 3 constitutes, and each installs connecting relation and is: at three-phase power input end major loop A, B, C is parallel connection A.C. contactor 5-1 respectively, 5-2,5-3, bidirectional triode thyristor 7-1,7-2,7-3, bidirectional triode thyristor 7-1,7-2, the 7-3 output connects power resistor 6-1,6-2,6-3, bidirectional triode thyristor 9-1,9-2,9-3, bidirectional triode thyristor 9-1,9-2, the 9-3 input connects power resistor 8-1,8-2, output connects motor 10 behind the 8-3, bidirectional triode thyristor trigger switch circuit 4 output triggering signal end parallel connection bidirectional triode thyristor 7-1,7-2,7-3 and bidirectional triode thyristor 9-1,9-2, the triggering input of 9-3, digital signal processor 1 output connect the input/output terminal of bidirectional triode thyristor trigger switch circuit 4, digital signal processor 1 input connects voltage transformer 2 signal output parts and current transformer 11 signal output parts, and digital signal processor 1 connects keypad/display 3 simultaneously.
The running status of device is: digital signal processor 1 drives bidirectional triode thyristor trigger switch circuit 4 closed contactor 5-1,5-2, and 5-3 triggers bidirectional triode thyristor 7-1,7-2,7-3,9-1,9-2,9-3 connects power resistor 6-1,6-2,6-3,8-1,8-2,10 operations of 8-3 actuating motor.Write motor parameter by keypad/display 3 to digital signal processor 1, voltage data is gathered by voltage transformer 2, and current data is gathered by current transformer 11.Digital signal processor 1 calculates the running status of motor 10 after receiving voltage, current signal, the break-make that digital signal processor 1 is controlled bidirectional triode thyristor trigger switch circuit 4 decision bidirectional triode thyristors according to the running status of motor 10 increases and decreases the power resistor 6-1 on the major loop, 6-2,6-3,8-1,8-2,8-3 increase or reduce motor 10 stator winding voltages, increase or reduce the purpose that stator current reaches stable electrical engine speed and saves energy.The asynchronous motor running hours must consume certain energy so that magnetic field to be provided.When the terminal voltage of supplying with asynchronous motor was constant, it is constant that the magnetic flux of generation also keeps.Under rated speed, it is constant that the magnetic field consumed energy keeps, irrelevant with the required torque of load.The energy size of holding load torque depends on the size of electromagnetic torque.If load torque increases, the rotating speed of motor rotor can descend (revolutional slip increase) a little, and the rotating speed of the rotor of induction is risen to increase electromagnetic torque, and the electric current that increases in the rotor comes balance by the electric current that increases in the stator winding; On the contrary, if load torque reduces, the rotating speed of rotor can increase (revolutional slip reduces) a little, makes rotor inductive currents descend the also corresponding decline of stator current.Asynchronous motor is most effective about about 90% under nominal load, and (near synchronous speed) efficient is minimum near zero under zero load.
Asynchronous motor is the inductive type circuit, and its voltage waveform and current waveform life period are poor, and current waveform lags behind voltage waveform.Load is light more, and current waveform lags behind big more.By the former JB/T-10391-2002 of Ministry of Machine-Building Industry standard-required: Y series motor power factor under nominal load is 0.83, and power factor is 0.034 under no-load condition.At the motor of actual motion, considerable part is under underloading or Light Condition, and low power factor operation (also being fallback simultaneously) is the main cause of asynchronous motor waste electric energy.The present invention is equivalent to add between asynchronous motor and the electrical network power consumption Management Controller.It is delivered to digital signal processor waveform is analyzed by voltage transformer and current transformer sampled voltage, current signal, judges the load condition of asynchronous motor according to phase difference.If phase difference is big, the low digital signal processor of power factor is with regard to control switch drives bidirectional triode thyristor, and the serial connection power resistor reduces the terminal voltage of stator winding on major loop, reduces stator current and improves power factor, make motor operate in optimum state, reach energy-conservation purpose.
Claims (1)
1. one kind has the AC asynchronous motor energy saver that improves power factor, it is characterized in that: by digital signal processor, voltage transformer, current transformer, switching circuit, A.C. contactor, bidirectional triode thyristor, power resistor, keyboard/display circuit constitutes, device is at three-phase power input end (A, B, C) parallel connection A.C. contactor (5-1,5-2,5-3), the A.C. contactor output connects motor, three-phase power input end (A, B, C) parallel connection bidirectional triode thyristor (7-1,7-2,7-3), at bidirectional triode thyristor (7-1,7-2,7-3) output connects power resistor (6-1,6-2,6-3), the power resistor output connects motor, three-phase power input end (A, B, C) parallel connection power resistor (8-1,8-2,8-3), (8-3) output connects bidirectional triode thyristor (9-1 to power resistor for 8-1,8-2,9-2,9-3), bidirectional triode thyristor (9-1,9-2,9-3) output connects motor, bidirectional triode thyristor trigger switch circuit (4) output parallel connection bidirectional triode thyristor (7-1,7-2,7-3) and bidirectional triode thyristor (9-1,9-2, input 9-3), digital signal processor (1) output connects the input/output terminal of bidirectional triode thyristor trigger switch circuit (4), and digital signal processor (1) input connects voltage transformer signal output part (2), digital signal processor (1) connects current transformer (11) signal output part, and digital signal processor (1) connects keypad/display (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202494212U CN201557078U (en) | 2009-12-01 | 2009-12-01 | Energy-saving device for AC asynchronous motor with function of improving power factor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202494212U CN201557078U (en) | 2009-12-01 | 2009-12-01 | Energy-saving device for AC asynchronous motor with function of improving power factor |
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| Publication Number | Publication Date |
|---|---|
| CN201557078U true CN201557078U (en) | 2010-08-18 |
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| CN2009202494212U Expired - Lifetime CN201557078U (en) | 2009-12-01 | 2009-12-01 | Energy-saving device for AC asynchronous motor with function of improving power factor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066629A (en) * | 2018-09-14 | 2018-12-21 | 珠海格力电器股份有限公司 | Electric motor protective device and air-conditioning |
-
2009
- 2009-12-01 CN CN2009202494212U patent/CN201557078U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066629A (en) * | 2018-09-14 | 2018-12-21 | 珠海格力电器股份有限公司 | Electric motor protective device and air-conditioning |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100818 |