CN101674045A - Voltage-regulating and energy-saving controller for asynchronous motor - Google Patents
Voltage-regulating and energy-saving controller for asynchronous motor Download PDFInfo
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- CN101674045A CN101674045A CN200810196005A CN200810196005A CN101674045A CN 101674045 A CN101674045 A CN 101674045A CN 200810196005 A CN200810196005 A CN 200810196005A CN 200810196005 A CN200810196005 A CN 200810196005A CN 101674045 A CN101674045 A CN 101674045A
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Abstract
The utility model relates to a voltage-regulating and energy-saving controller for an asynchronous motor, which is suitable for a variable frequency transmission system in industrial and agriculturalproduction. Mostly, an energy-saving start controller for a generally known asynchronous motor outputs a trigger pulse of a thyristor based on a zero-crossing point of voltage signals of a power supply, and regulates the terminal voltage of the motor to achieve the aim of saving energy. An experimental research indicates that a phenomenon of concussion of the current and the rotating speed of themotor occurs easily when the light load soft start and the voltage-regulating and energy-saving control are performed on the motor in a voltage regulating mode. The voltage-regulating and energy-saving controller comprises a trigger pulse drive circuit, a current synchronization signal detection circuit, a supply voltage synchronization signal detection circuit, a controller power supply, a failure detection circuit, a control chip and a power thyristor, and has the advantages that the concussion phenomenon in a voltage regulating process of voltage synchronization signal is avoided, and the whole circuit has simple structure and is easy to implement and operation by adopting voltage-regulating and energy-saving control signal as a power factor.
Description
Technical field
The present invention relates to a kind of voltage-regulating and energy-saving controller for asynchronous motor, be applicable to the Frequency Drive system in the industrial and agricultural production.Belong to electrician, machine field.
Background technology
The energy-conservation starter controller of known asynchronous motor, many is the trigger impulse of benchmark output thyristor with the power source voltage cycle signal zero-cross point, the terminal voltage of regulating motor reaches purpose of energy saving.Experimental study shows, occurs the phenomenon of current of electric and rotating speed concussion when adopting this voltage regulating mode that motor is carried out underloading soft start and pressure regulating energy-saving control easily.Thereby people urgently wish to have a kind of energy-saving controller that can overcome above-mentioned defective to come out.
Summary of the invention
In order to adopt simple circuit configuration and rational controlled quentity controlled variable realization asynchronous motor to stablize the purpose of soft start and the operation of underloading pressure regulating energy-saving, the invention provides a kind of voltage-regulating and energy-saving controller for asynchronous motor.
To achieve these goals, technical scheme of the present invention is to be made of trigger impulse drive circuit, current synchronous signal testing circuit, supply voltage synchronization signal detection circuit, controller power source and failure detector circuit, control chip, power scr.It is characterized in that the power scr of connecting respectively between the motor of three phase mains and asynchronous motor, the current synchronous signal testing circuit is in parallel with power scr; The input of controller power source and failure detector circuit and power supply A are mutually, B is connected, and its output links to each other with control chip; The input of supply voltage synchronization signal detection circuit is connected with three phase mains, and its signal outputs to control chip; The signal of current synchronous signal testing circuit outputs to control chip; The signal of control chip outputs to the trigger impulse drive circuit, and the trigger impulse drive circuit is connected with two trigger ends of power scr.
The invention has the beneficial effects as follows: avoid that reforming phenomena appears in motor in voltage synchronizing signal pressure regulation process, adopt power factor to make integrated circuit relatively simple for structure, easy to implement and operation for the pressure regulating energy-saving control signal.
Description of drawings
Accompanying drawing 1 is a structure chart of the present invention
Accompanying drawing 2 is the circuit diagram of current synchronous signal testing circuit among the present invention
Accompanying drawing 3 is the circuit diagram of trigger impulse drive circuit among the present invention
Accompanying drawing 4 is the circuit diagram of supply voltage synchronization signal detection circuit among the present invention
In the accompanying drawing, 1,3,5 trigger impulse drive circuits, 2,4,6 current synchronous signal testing circuits, 7 supply voltage synchronization signal detection circuits, 8 controller power sources and failure detector circuit, 9 control chips, 10,11,12 power scrs, 13 asynchronous motor motors.
Embodiment
Carefully connect the wire by the sign in the present invention, energising back controller power source and failure detector circuit 8 are for the invention provides power supply.Three phase mains forms the loop by the RC absorption circuit in the current synchronous signal testing circuit 2,4,6 before the thyristor conducting, this moment, the signal of current synchronous signal testing circuit 2,4,6 outputs was the crossover point signal of three-phase voltage, and this signal is used to judge the phase sequence of power supply.Control chip 9 judges that according to the signal of being surveyed 7 slowdown monitoring circuits of supply voltage synchronization signal detection circuit are the A phase, with A phase voltage synchronizing signal is reference, by trigger impulse drive circuit 1,3,5, send A sequentially, B, power scr 10 in the C three-phase circuit, 11,12 trigger impulse, make electrical power, in case there is electric current to flow through power scr 10,11,12, current synchronous signal testing circuit 2,4,6 detected signals are current synchronous signal just, this moment, reference data was changed to current synchronous signal, adjust each phase start pulse signal, electric moter voltage is progressively raise, realize electric machine soft starting.
After the motor stabilizing operation, do not disappear in order to make current synchronous signal, so power scr 10,11,12 conductings entirely.Relatively but the time difference of the A phase voltage crossover point signal of the A phase current crossover point signal of current synchronous signal testing circuit 2 detections and 7 detections of supply voltage synchronization signal detection circuit is the time parameter at the power scale factor angle of asynchronous machine, utilize control chip 9 to be converted to the power factor parameter, be used for underloading pressure regulating energy-saving Control Parameter.Because the electric current of pressure regulation rear motor is a nonsinusoidal waveform, so this value is not the actual power factor of motor, but the size and the load state of its reflection power factor.If control chip 9 judges that according to this power factor size motor is in the light running situation, increase the trigger angle of thyristor by trigger impulse drive circuit 1,3,5, reduce the voltage of motor, guaranteed output factor back in a suitable scope keeps trigger angle, and this moment, input voltage and load were complementary.If load this moment increases, control chip 9 will reduce the trigger angle of thyristor according to the variation of power factor by trigger impulse drive circuit 1,3,5, the voltage of motor is increased, after a suitable scope, keep trigger angle constant up to power factor, this moment, motor operated in the matching voltage value of this load, thereby guarantee that motor is operated in the near optimal matching voltage in whole loading range, reach the purpose of dynamic energy-saving.
Supply voltage synchronization signal detection circuit 7 and controller power source and failure detector circuit 8 are in conjunction with judging whether protections such as phase shortage and motor overheating to occur normally total head operation of timely bypass assurance motor when thyristor breaks down.
Claims (1)
1, a kind of voltage-regulating and energy-saving controller for asynchronous motor is characterized in that the power scr of connecting respectively between the motor of three phase mains and asynchronous motor, and the current synchronous signal testing circuit is in parallel with power scr; The input of controller power source and failure detector circuit and power supply A are mutually, B is connected, and its output links to each other with control chip; The input of supply voltage synchronization signal detection circuit is connected with three phase mains, and its signal outputs to control chip; The signal of current synchronous signal testing circuit outputs to control chip; The signal of control chip outputs to the trigger impulse drive circuit, and the trigger impulse drive circuit is connected with two trigger ends of power scr.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810196005A CN101674045A (en) | 2008-09-10 | 2008-09-10 | Voltage-regulating and energy-saving controller for asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810196005A CN101674045A (en) | 2008-09-10 | 2008-09-10 | Voltage-regulating and energy-saving controller for asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101674045A true CN101674045A (en) | 2010-03-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810196005A Pending CN101674045A (en) | 2008-09-10 | 2008-09-10 | Voltage-regulating and energy-saving controller for asynchronous motor |
Country Status (1)
| Country | Link |
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| CN (1) | CN101674045A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780448A (en) * | 2012-07-23 | 2012-11-14 | 苏州德能电机有限公司 | Three-phase asynchronous motor energy-saving device |
| CN114362629A (en) * | 2021-12-30 | 2022-04-15 | 上海电机学院 | Energy-saving control system for cage type asynchronous motor |
-
2008
- 2008-09-10 CN CN200810196005A patent/CN101674045A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780448A (en) * | 2012-07-23 | 2012-11-14 | 苏州德能电机有限公司 | Three-phase asynchronous motor energy-saving device |
| CN114362629A (en) * | 2021-12-30 | 2022-04-15 | 上海电机学院 | Energy-saving control system for cage type asynchronous motor |
| CN114362629B (en) * | 2021-12-30 | 2023-08-29 | 上海电机学院 | Cage type asynchronous motor energy-saving control system |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Open date: 20100317 |