CN201726156U - Feedback energy-saving device with variable-frequency motor - Google Patents
Feedback energy-saving device with variable-frequency motor Download PDFInfo
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- CN201726156U CN201726156U CN2010202993868U CN201020299386U CN201726156U CN 201726156 U CN201726156 U CN 201726156U CN 2010202993868 U CN2010202993868 U CN 2010202993868U CN 201020299386 U CN201020299386 U CN 201020299386U CN 201726156 U CN201726156 U CN 201726156U
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Abstract
The utility model relates to a feedback energy-saving device with a variable-frequency motor, which is capable of effectively solving the problems of high energy consumption and low efficiency of power grid. The technical scheme for solving the problems is as follows: the feedback energy-saving device with the variable-frequency motor comprises a frequency converter, a feedback energy-saving device and a motor, wherein the input end of the feedback energy-saving device is connected with the input end of the power grid and that of the frequency converter, the output end of the frequency converter is connected with the three-phase input end of the motor, the output end of the feedback energy-saving device is connected with the positive terminal as well as the negative terminal of a direct current (DC) bus of the frequency converter, and the three-phase output end of the frequency converter is connected with the three-phase input end of the motor. The feedback energy-saving device with the variable-frequency motor has simple, novel and peculiar structure, and is used for replacing the traditional braking device of a transformer so as to effectively convert the inertial electromotive force of the motor into electrical energy meeting the requirements of the national power grid and feed back the electrical energy into the power grid, thereby increasing the efficiency of the power grid and saving the energy.
Description
Technical field
The utility model relates to electrical equipment, particularly at the energy-conservation a kind of variable-frequency motor feedback energy saver of variable-frequency motor feedback.
Background technology
The technology that is used for motor power saving at present mainly is a variable frequency control.
In frequency conversion control circuit, must install brake apparatus additional, the important function of brake apparatus is to eliminate the electromotive force that produces owing to inertia in the back that runs up because of motor, this electromotive force can make DC bus-bar voltage raise by the output circuit of frequency converter, can damage frequency converter and control appliance, must be eliminated or limit.
Present brake apparatus all is resistance class power consumption devices, by resistance electric energy is converted to heat energy, thereby eliminates the inertia electromotive force of motor, the energy consumption height, and electrical network efficient is low, so the improvement on its equipment is imperative with innovation.
Summary of the invention
At above-mentioned situation, for overcoming the prior art defective, the purpose of the utility model just provides a kind of variable-frequency motor feedback energy saver, can effectively solve the energy consumption height, the inefficient problem of electrical network.
The technical scheme that the utility model solves is, comprise frequency converter, feedback energy saver and motor, the get access to grid input of input and frequency converter of feedback energy saver input, inverter output terminal connects the three-phase input end of motor, the dc bus anode and the dc bus negative terminal of the output termination frequency converter of feedback energy saver, the three-phase output end of frequency converter connects the three-phase input end of motor.
The utility model is simple in structure, and is novel unique, is used to replace the brake apparatus of traditional transformer, effectively the inertia electromotive force of motor changed into to meet the electric energy that national grid requires and feed back to again in the electrical network, to improve the efficient of electrical network, energy savings.
Description of drawings
The circuit theory diagrams that Fig. 1 implements for the utility model.
Fig. 2 is the feedback energy saver theory diagram of the utility model variable-frequency motor.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is elaborated.
Shown in Fig. 1,2, the utility model comprises frequency converter, feedback energy saver and motor, the get access to grid input of input R, S, T and frequency converter 1 of feedback energy saver 2 input A, B, C, frequency converter 1 output U, V, W meet motor 3(M) three-phase input end, output IN+, the IN-of feedback energy saver 2 meets the dc bus anode P+ and the dc bus negative terminal G of frequency converter 1, and three-phase output end U, the V of frequency converter 1, W meet motor 3(M) three-phase input end.
In order to guarantee result of use, said feedback energy saver 2 is made up of housing and interior circuit thereof, this circuit comprises voltage sample circuit 4, control circuit 5, synchronous circuit 7, electric energy change-over circuit 6, ac filter circuit 9, output circuit 8, the input of the output connection control circuit 5 of voltage sample circuit 4, the input of the output termination electric energy change-over circuit 6 of control circuit 5, the input of the output termination output circuit 8 of electric energy change-over circuit 6, be connected to synchronous circuit 7 on the output circuit 8 respectively, ac filter circuit 9, the output circuit 8 input R that gets access to grid in parallel with the output of synchronous circuit 7, S, the input of T and frequency converter 1;
Bridge rectifier and the triode of output and the driving output circuit that diode is formed that said frequency converter 1 is made up of the rectifier diode of input are parallel with storage capacitor C between the dc bus anode P+ of frequency converter 1, the dc bus negative terminal G;
Said feedback energy saver 2 links to each other with frequency converter 1 braking link, described motor feedback energy saver is a kind of electric energy feedback apparatus, be used for the energy recovery utilization, can will originally consume in ohmically electric energy regeneration inversion to utilizing again with three phase AC sine wave current feedback to the electrical network of electric network source with frequency, homophase.
This energy saver includes the frequency converter 1 that can realize that motor M runs well, and the feedback energy saver 2(that realizes motor has promptly replaced original release resistance and brake resistance with feedback energy saver 2), frequency converter 1 has three-phase input end R, S, T(is the electrical network input) and the three-phase output end U that links to each other with motor M, V, W, frequency converter 1 also includes passing through three-phase input end R, S, T carries out the bridge rectifier of rectification, and the frequency converter output circuit that links to each other with motor M, also include voltage sample circuit 4 in the feedback energy saver 2, control circuit 5, electric energy change-over circuit 6, synchronous circuit 7, output circuit 8 and ac filter circuit 9.
The input of described output circuit 8 links to each other with input with the output of ac filter circuit 26 respectively with output.
The input of described output circuit 8 links to each other with input with the output of synchronous circuit 7 respectively with output.
By said structure as can be seen, the utility model is to be under the inertia generating state at motor, the electric energy that motor sends is added on the frequency converter bus by the frequency converter output circuit, these electric energy discharge by external brake resistance and the release resistance that is connected in parallel on the frequency converter DC loop, electric energy becomes heat energy by release resistance and brake resistance and dissipates, this makes the ambient temperature secondary raise, and causes secondary pollution.
Original release resistance and brake resistance are removed; feedback energy saver by motor replaces; the frequency converter 1 that to realize that motor M runs well is equipped with and; this frequency converter 1 has three-phase input end R; S; T(is the electrical network input) and the three-phase output end U that links to each other with motor M; V; W; frequency converter 1 also includes passing through three-phase input end R; S; T carries out the bridge rectifier of rectification; and the frequency converter output circuit that links to each other with motor M; dc bus anode P+ at frequency converter 1; also be parallel with a storage capacitor C between the dc bus negative terminal G; can make the voltage that is added on the bus that the process of a gradual change is arranged, thereby realize the purpose of protection bus.
2 of feedback energy savers have positive input terminal IN+, negative input end IN-and output, wherein, three-phase input end R, S, the T of the corresponding frequency converter 1 of inverting output terminal, be on corresponding respectively three-phase input end R, the S that is connected to frequency converter 1 of the output terminals A, B, C of feedback energy saver 2, the T, the positive input terminal IN+ of feedback energy saver 2 connects the dc bus anode P+ of frequency converter 1, and the negative input end IN-of feedback energy saver 2 then connects the dc bus negative terminal G of frequency converter 1;
The positive input terminal IN+ of feedback energy saver 2, negative input end IN-gather the voltage P+ that comes from frequency converter 1 bus, G as the input of voltage sample circuit 4; Voltage sample circuit 4 will collect voltage again and be input to realization magnitude of voltage comparison in the control circuit 5, judge whether the voltage of frequency converter 1 dc bus surpasses the voltage of preset value; When the voltage of gathering exceeded preset value, control circuit 5 was opened, and realized straight-interchange conversion by electric energy change-over circuit 6, finally regenerative electric energy was fed back on the input of frequency converter 1 by output circuit 8, realized the regeneration of electric energy.Safety in order to ensure electrical network and equipment, feed back to electric energy that electrical network utilizes again must and electric network source for frequently, the three phase AC sine wave electric current of homophase, therefore, when electric current feeds back to the electrical network input once more through output circuit 8, must also to pass through synchronous circuit 7, but the phase place and the frequency of synchronous circuit 7 continuous acquisition electric network sources, to guarantee that inversion out-put supply and electric network source are with frequency, homophase, and through ac filter circuit 9 filtering and reduce harmonic constant, to satisfy the requirement of national grid.
During the utility model operate as normal, motor M is in motoring condition, electric network source is imported three-phase alternating current through three-phase input end R, S, the T of frequency converter 1, realizes exporting to the electric energy that motor M provides normal rotation behind the inversion changing frequency by rectified three-phase circuit, frequency converter output circuit;
When motor was in brake running state, at this moment, motor was in generating state, and its electric current is added on the dc bus of frequency converter 1 by the fly-wheel diode of frequency converter output circuit, caused the voltage on the dc bus sharply to raise.But the input of the voltage sample circuit 4 of feedback energy saver 2 is because connect dc bus anode P+, dc bus negative terminal G continuous acquisition busbar voltage respectively; When busbar voltage is raised to the 650V left and right sides, control circuit 5 is opened, feedback energy saver 2 is started working, and the voltage of 23 pairs of collections of process electric energy change-over circuit carries out the dc inversion processing, synchronous circuit 7 and ac filter circuit 9 act on simultaneously, will be fed in the electrical network by output circuit 8 through the electric current that electric energy change-over circuit 6 is handled:
Because the output terminals A of output circuit 8, B, C link to each other respectively with three-phase input end R, S, the T of frequency converter 1, for synchronous circuit 7 provides synchronizing information continuously, thereby guarantee inversion out-put supply and electric network source frequency, homophase together, guarantee the safety of electrical network and equipment; Simultaneously, after ac filter circuit 9 filtering, make the voltage harmonic coefficient of output circuit 8 outputs be not more than 5%, can form the output of three phase AC sine wave electric current, can satisfy the requirement of national grid, realize that feedback grid utilizes again.
The utility model be a kind of be the energy regeneration inversion feedback device of core with frequency converter (inverter), can be with the inversion efficiency of 95-98%, is the electric energy regeneration inversion that consumes on brake resistance to utilize with three phase AC sine wave current feedback to the electrical network of electric network source with frequency, homophase again, reaches energy-conservation purpose.
The utility model compared with prior art, having outstanding substantive distinguishing features is: cancelled original braking resistor device, brake port at frequency converter has connected the utility model device for converting electric energy as energy source feedback, the inertia electromotive force of motor can be converted to by this conversion equipment and meet the sinusoidal wave electric energy recycling that national grid requires (harmonic constant is less than 5%), again feed back in the electrical network, saves energy reaches more than 20%; Can save a large amount of energy, reduce cost, be that one on the feedback energy-saving device with variable-frequency motor innovated greatly.
Claims (3)
1. variable-frequency motor feedback energy saver, comprise frequency converter, feedback energy saver and motor, it is characterized in that, the get access to grid input of input R, S, T and frequency converter (1) of feedback energy saver (2) input A, B, C, frequency converter (1) output U, V, W connect the three-phase input end of motor (3), output IN+, the IN-of feedback energy saver (2) meets the dc bus anode P+ and the dc bus negative terminal G of frequency converter (1), and three-phase output end U, V, the W of frequency converter (1) connect the three-phase input end of motor (3).
2. variable-frequency motor feedback energy saver according to claim 1, it is characterized in that, said feedback energy saver (2) is made up of housing and interior circuit thereof, this circuit comprises voltage sample circuit (4), control circuit (5), synchronous circuit (7), electric energy change-over circuit (6), ac filter circuit (9), output circuit (8), the input of the output connection control circuit (5) of voltage sample circuit (4), the input of the output termination electric energy change-over circuit (6) of control circuit (5), the input of the output termination output circuit (8) of electric energy change-over circuit (6), be connected to synchronous circuit (7) on the output circuit (8) respectively, ac filter circuit (9), output circuit (8) the input R that gets access to grid in parallel with the output of synchronous circuit (7), S, the input of T and frequency converter (1).
3. variable-frequency motor feedback energy saver according to claim 1, it is characterized in that, bridge rectifier and the triode of output and the driving output circuit that diode is formed that said frequency converter (1) is made up of the rectifier diode of input are parallel with storage capacitor C between the dc bus anode P+ of frequency converter (1), the dc bus negative terminal G.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202993868U CN201726156U (en) | 2010-08-20 | 2010-08-20 | Feedback energy-saving device with variable-frequency motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202993868U CN201726156U (en) | 2010-08-20 | 2010-08-20 | Feedback energy-saving device with variable-frequency motor |
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| CN201726156U true CN201726156U (en) | 2011-01-26 |
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| CN2010202993868U Expired - Fee Related CN201726156U (en) | 2010-08-20 | 2010-08-20 | Feedback energy-saving device with variable-frequency motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570501A (en) * | 2011-12-28 | 2012-07-11 | 台达电子企业管理（上海）有限公司 | Product quality aging testing system |
| CN113321127A (en) * | 2021-05-07 | 2021-08-31 | 中交第四航务工程局有限公司 | Energy-saving technical improvement method and system for gantry crane and bridge crane |
-
2010
- 2010-08-20 CN CN2010202993868U patent/CN201726156U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570501A (en) * | 2011-12-28 | 2012-07-11 | 台达电子企业管理（上海）有限公司 | Product quality aging testing system |
| CN113321127A (en) * | 2021-05-07 | 2021-08-31 | 中交第四航务工程局有限公司 | Energy-saving technical improvement method and system for gantry crane and bridge crane |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110126 Termination date: 20160820 |
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| CF01 | Termination of patent right due to non-payment of annual fee |