CN204189361U - AC speed regulating experimental provision - Google Patents
AC speed regulating experimental provision Download PDFInfo
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- CN204189361U CN204189361U CN201420665001.3U CN201420665001U CN204189361U CN 204189361 U CN204189361 U CN 204189361U CN 201420665001 U CN201420665001 U CN 201420665001U CN 204189361 U CN204189361 U CN 204189361U
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- inverter
- motor
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- electric signal
- rectifier
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Abstract
AC speed regulating experimental provision comprises rectifier, the first inverter, the second inverter, control circuit, the first motor and the second motor; Three-phase alternating-current supply connects the input end of rectifier, and the output terminal of rectifier connects the first inverter and the second inverter by DC bus; First control end and second control end of control circuit are connected the first inverter and the second inverter respectively, regulate electric signal and second frequency to regulate electric signal to the first inverter and the second inverter to send first frequency respectively; First inverter is connected the first motor and the second motor respectively with the output terminal of the second inverter, first inverter regulates electric signal to export the first variable-frequency electric according to first frequency and is depressed into the first motor, and the second inverter regulates electric signal to export the second variable-frequency electric according to second frequency and is depressed into the second motor; First motor is coaxially connected with the rotating shaft of the second motor.The utility model structure is simple and energy-conservation.
Description
Technical field
The utility model relates to a kind of AC speed regulating experimental provision.
Background technology
AC speed regulating experimental provision is the experimental real-training equipment that the specialties such as domestic and international industry science universities motor, electrical engineering and electric automatization must equip and apply, and serves above-mentioned professional motor, drags the experimental teaching application such as control, frequency converter ac speed control technology.Up to the present, the AC speed regulating experimental provision of widespread use or conventional motors and generator unit structure, the process of speed regulating control experiment under motor arbitrary load, be all the process that motor consumes that electrical energy drive electrical power generators connects the energy consumption equipment power consumptions such as electric heating, form the load condition of motor; In traditional motor drag experimental system, test the process of correlation performance parameters by normal consumption electric energy under being realized the load condition of this dragging system, this is undoubtedly the process of a pure power consumption, there is the energy consumption compared with heavy load.
Utility model content
For the deficiencies in the prior art, the utility model is intended to provide a kind of AC speed regulating experimental provision solved the problems of the technologies described above.
For achieving the above object, the utility model adopts following technical scheme:
A kind of AC speed regulating experimental provision, it comprises rectifier, the first inverter, the second inverter, control circuit, the first motor and the second motor;
One three-phase alternating-current supply connects the input end of rectifier, and the output terminal of rectifier connects the input end of the first inverter and the second inverter by DC bus; First control end and second control end of control circuit are connected the drive end of the first inverter and the second inverter respectively, regulate electric signal and second frequency to regulate electric signal to the first inverter and the second inverter to send first frequency respectively; First inverter is connected the first motor and the second motor respectively with the output terminal of the second inverter, first inverter regulates electric signal to export the first variable-frequency electric according to first frequency and is depressed into the first motor, and the second inverter regulates electric signal to export the second variable-frequency electric according to second frequency and is depressed into the second motor; First motor is connected with the rotating shaft coaxial cable of the second motor, and the frequency of the first frequency conversion voltage is greater than the frequency of the second frequency conversion voltage.
Preferably, this rectifier is three-phase commutation bridge.
The beneficial effects of the utility model are at least as follows:
The utility model exports the first now coaxial motor of variable-frequency electric compacting and the four quadrant running of the second motor under Way of Regenerating Energy Feedback state separately by control two inverters, thus making a wherein motor be operated in motoring condition at any one time, another motor is then operated in generating state.So, motor reel produces its load form of the electromagnetic torque mode under a kind of Way of Regenerating Energy Feedback effect that generates electricity, experimental provision does not need generator external load, also just without the energy consumption of external load.This device not only simplifies speed control system structure, can also realize the property indices of AC speed regulating experimentation under almost idle load, reach the effect of energy-conserving and environment-protective.
Accompanying drawing explanation
Fig. 1 is the electrical structure schematic diagram of the better embodiment of the utility model AC speed regulating experimental provision.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described further:
Refer to Fig. 1, the utility model relates to a kind of AC speed regulating experimental provision, and its better embodiment comprises rectifier 10, first inverter 20, second inverter 30, control circuit 40, first motor M 1 and the second motor M 2.
One three-phase alternating-current supply AC connects the input end of rectifier 10, and the output terminal of rectifier 10 connects the input end of the first inverter 20 and the second inverter 30 by DC bus; First control end and second control end of control circuit are connected the drive end of the first inverter 20 and the second inverter 30 respectively, regulate electric signal and second frequency to regulate electric signal to the first inverter 20 and the second inverter 30 to send first frequency respectively; First inverter 20 and the output terminal of the second inverter 30 are connected the first motor M 1 and the second motor M 2 respectively, first inverter 20 regulates electric signal to export the first variable-frequency electric according to first frequency and is depressed into the first motor M 1, second inverter 30 and regulates electric signal to export the second variable-frequency electric and be depressed into the second motor M 2 according to second frequency.First motor M 1 is connected with the rotating shaft coaxial cable of the second motor M 2, and the frequency of the first frequency conversion voltage is greater than the frequency of the second frequency conversion voltage, with the rotating speed making the rotating speed of the first motor M 1 be greater than the second motor M 2.
The principle of work of the present embodiment is as follows:
Second variable-frequency electric of the first inverter 20 and the second inverter 30 output frequency to be the first frequency conversion voltage of f1 and frequency be f2 is respectively depressed into the first motor M 1 and the second motor M 2, and frequency f 1 is greater than frequency f 2.According to motor speed formula
known, under this difference frequency state, the rotating speed of the first motor M 1 is greater than the rotating speed of the second motor M 2, therefore, coaxial upper first motor M1 drags the supersynchronous rotation of the second motor M 2, now, first motor M 1 is operated in motoring condition, second motor M 2 is operated in generating state, according to AC motor four-quadrant operation characteristic principle, now two motors produces contrary electromagnetic torque respectively on axle, a kind of its load form based on electromagnetic torque mode is obtained on axle to the first motor M1 being in motoring condition, namely a kind of AC speed regulating load test process not having actual loading power consumption is achieved.By changing the frequency-splitting between frequency f 1 and frequency f 2, just can control the load of motor and the transformation of running status, realizing AC speed regulating experimental provision four-quadrant idle load characteristic.
The regenerative electric power alternating voltage that the second motor M 2 being in generating state produces oppositely is rectified into DC voltage by the backward dioded bridge road of corresponding inverter parallel, and flow to the first motor M 1 by DC bus, use to supply the first motor M 1, the whole feedback of the regeneration energy consumption of the first motor M 1 is re-used, thus reduce the next electric energy to electrical network of the first motor M1 absorption, and then reduce electrical network energy consumption.Therefore in theory, the electric energy power of this device consumption is only used for excitatory, the loss and inverter switching device loss etc. of motor unit in system, therefore can think that this system is the energy saving A. C arrangements for speed regulation not having axle load power consumption.
This device can make a wherein motor be operated in motoring condition at any one time, and another motor is then operated in generating state.So, motor reel produces its load form of the electromagnetic torque mode under a kind of Way of Regenerating Energy Feedback effect that generates electricity, experimental provision does not need generator external load, also just without the energy consumption of external load.This device not only simplifies speed control system structure, can also realize the property indices of AC speed regulating experimentation under almost idle load, reach the effect of energy-conserving and environment-protective.
The variable frequency control principle of this control circuit to the first inverter 20 and the second inverter 30 can be known by the frequency controller of the inverter of prior art, and the utility model does not make improvements in this respect.
Such as, this control circuit comprises the analog-digital chip of the single-chip microcomputer of AT89C52 model, the code translator of LS138 model, the parallel interface chip of 8155 models, keyboard scanning circuit, display driver circuit and two DAC1006LCN models.
This rectifier 10 is three-phase commutation bridge.
For a person skilled in the art, according to technical scheme described above and design, other various corresponding change and distortion can be made, and all these change and distortion all should belong within the protection domain of the utility model claim.
Claims (2)
1. an AC speed regulating experimental provision, is characterized in that: it comprises rectifier, the first inverter, the second inverter, control circuit, the first motor and the second motor;
One three-phase alternating-current supply connects the input end of rectifier, and the output terminal of rectifier connects the input end of the first inverter and the second inverter by DC bus; First control end and second control end of control circuit are connected the drive end of the first inverter and the second inverter respectively, regulate electric signal and second frequency to regulate electric signal to the first inverter and the second inverter to send first frequency respectively; First inverter is connected the first motor and the second motor respectively with the output terminal of the second inverter, first inverter regulates electric signal to export the first variable-frequency electric according to first frequency and is depressed into the first motor, and the second inverter regulates electric signal to export the second variable-frequency electric according to second frequency and is depressed into the second motor; First motor is connected with the rotating shaft coaxial cable of the second motor, and the frequency of the first frequency conversion voltage is greater than the frequency of the second frequency conversion voltage.
2. AC speed regulating experimental provision as claimed in claim 1, is characterized in that: this rectifier is three-phase commutation bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420665001.3U CN204189361U (en) | 2014-11-06 | 2014-11-06 | AC speed regulating experimental provision |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420665001.3U CN204189361U (en) | 2014-11-06 | 2014-11-06 | AC speed regulating experimental provision |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204189361U true CN204189361U (en) | 2015-03-04 |
Family
ID=52621340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420665001.3U Expired - Fee Related CN204189361U (en) | 2014-11-06 | 2014-11-06 | AC speed regulating experimental provision |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204189361U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053054A (en) * | 2016-05-24 | 2016-10-26 | 哈尔滨工程大学 | Gear box characteristic parameter real-time on-line detection device |
-
2014
- 2014-11-06 CN CN201420665001.3U patent/CN204189361U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053054A (en) * | 2016-05-24 | 2016-10-26 | 哈尔滨工程大学 | Gear box characteristic parameter real-time on-line detection device |
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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 |
Granted publication date: 20150304 Termination date: 20201106 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |