CN203775088U - Compound soft starter for AC (alternating current) asynchronous motor - Google Patents
Compound soft starter for AC (alternating current) asynchronous motor Download PDFInfo
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- CN203775088U CN203775088U CN201420045856.6U CN201420045856U CN203775088U CN 203775088 U CN203775088 U CN 203775088U CN 201420045856 U CN201420045856 U CN 201420045856U CN 203775088 U CN203775088 U CN 203775088U
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Abstract
The utility model relates to a compound soft starter for an AC (alternating current) asynchronous motor, relates to flexible control technology of power devices, operation no-energy-consumption technology, electric parameter real-time measurement and control technology, reliable fault protection technology, and advanced microprocessor realization technology, and belongs to the technical field of AC asynchronous motors. The compound soft starter for the AC asynchronous motor is characterized by being composed of a micro-control chip STM32, fully controlled power devices IGBTs corresponding to phases of alternating current, and a magnetic latching relay. Because the fully controlled devices IGBTs are applied, the compound soft starter does not generate harmonic voltage and current to a power grid. The application of the magnetic latching relay enables to controller not to generate power consumption after the normal operation of the motor. The compound soft starter monitors three-phase current and three-phase voltages of the AC asynchronous motor in operation in real time, realizes accurate measurement of faults such as overcurrent, overload, overvoltage, undervoltage, phase failures, rotor locking, short circuits and performs rapid operation, can protect the motor and the soft starter itself in any fault of the motor, replace apparatuses specially made for motor protection in the market, and therefore omits motor control and a protection switching electrical device (CPS).
Description
Technical field
The utility model relates to the compound soft initiator of a kind of AC induction motor; the Flexibility Control Technique, operation Non-energy-consumption technology, the real-time observation and control technology of electrical quantity, reliable error protection technology, the advanced microprocessor that relate to power device are realized technology, belong to AC induction motor start-up technique field.
Background technology
Along with the high speed development of power electronic technology, from the eighties in 20th century, adopt AC voltage adjusting technology abroad, develop electric machine controller.This device adopts step-down mode, realizes the object of limiting motor starting current.Its course of work is that main circuit is serially connected between power supply and motor, to power device triggering signal, improves gradually motor both end voltage by control circuit, realizes motor and starts gently.
At present, external product mainly concentrates on soft initiator and has the frequency converter of soft start function concurrently, and these two kinds of control appliances all belong to solid-state soft starting device.Inverter start up motor effect is better than soft initiator, but due to frequency converter price comparison costliness, so in the occasion that there is no speed governing requirement, still wide selection soft initiator.Softly open the main product that starter is developed countries, as the 3RW22 series of Siemens Company, rated voltage 220V ~ 690V, rated current 5.5A ~ 1200A, the QC series of GE company, rated voltage 220V ~ 500V, rated current 14A ~ 1180A, the PSD series of ABB AB, rated voltage 220V ~ 690V, rated current 14A ~ 1000A.
State's outer controller develops into the high accuracy integrated control system taking CPU as control core from analog control circuit, control strategy is from open-loop voltage slope control mode, current limliting closed-loop control, develop into by detecting motor load signal, set up accurate Mathematical Modeling, adopt field orientation control and vector Torque Control, Electric Machine Control better effects if.
Domestic in the early 1990s soft start control technology that begins one's study, 1992 Nian Xipu Power Electronics Co., Ltd.s develop domestic soft initiator series of products.After decades development, develop into gradually tens of soft initiator manufacturers.But these manufacturer's production technologies are relatively backward, imitated foreign technology, does not have independent research and development capacity mostly.In general, there is a big difference than advanced foreign technology for domestic electric machine control technology at present, is mainly manifested in:
(1) electric machines control technology level entirety is relatively backward, although manufacturer is many, most of production scale is less, and production technology falls behind.
(2) the manufacture scale of domestic semiconductor power device is less, the development of restriction soft initiator.
(3) product function is simple, and reliable working performance is not high.
Electric machines control technology is the control technology of light current and forceful electric power combination, has both needed to process high-power power conversion, needs again to carry out signals collecting, conversion and computing.So electric machines control technology will improve development in the following aspects later:
(1) improve Control system resolution and accuracy.Control strategy is selected advanced control algorithm, makes system more intelligent, as fuzzy control, ANN Control etc.
(2) increase electric motor starting torque.The start mode of soft initiator is all under power frequency condition at present, realizes electric motor starting control by step-down mode.Electric motor starting torque and voltage are directly proportional to the ratio of frequency, can cause starting torque to reduce so reduce starting voltage under power frequency condition, are unfavorable for electric motor starting.Adopt classification varying frequency starting mode, make starting voltage and frequency ratio keep constant, can ensure that like this electric motor starting torque is large, realizes electric machine soft starting in fully loaded situation.
(3) electric machine control system develops to miniaturization, and integrated level is higher.
Although domestic electric machine controller manufacturer is a lot of at present, relatively backward in overall technology level and properties of product, in occupation rate of market, there is very large gap with external producer.
Utility model content
The purpose of this utility model is to provide the compound soft initiator of a kind of AC induction motor, by applying modern power electronic technology, microprocessor technology and advanced control theory, surely start and stop motor without step Horizon, avoid the problem such as machinery and electrical impact because adopting traditional start mode actuating motors such as across-the-line starting to cause, and can effectively reduce starting current and distribution capacity, in the useful life of prolonged mechanical equipment, the maintenance capacity of minimizing equipment, increases economic efficiency.
The purpose of this utility model is achieved through the following technical solutions, the compound soft initiator of a kind of AC induction motor, it is characterized in that, described soft initiator is by microcontroller chip STM32, and the full-control type power device IGBT of the each phase of corresponding alternating current and magnetic latching relay form; The input of microcontroller chip STM32 connects AC induction motor through voltage-current sensor, the P1 mouth of microcontroller chip STM32 connects as the G end of the igbt of full-control type power device and the input of magnetic latching relay, the positive and negative terminal magnetic latching relay in parallel of igbt, the positive and negative terminal of igbt connects respectively electricity and AC induction motor mutually; Microcontroller chip STM32 carries out programming Control full-control type power device and magnetic latching relay is realized the various control modes of AC induction motor.
Described each mutually in as igbt reverse parallel connection power diode and the RC dynamic buffering circuit in parallel of full-control type power device IGBT.
Described igbt adopts FGA25N120AN.
The utility model has advantages of following outstanding under the support of related software:
(1) this device can carry out the speed governing of motor.
(2) there are multiple Starting mode and multiple halt mode optional.
(3) impact torque and impulse current are little.Soft starter, in the time of starter motor, by increasing gradually the duty ratio of IGBT, makes electric motor starting current limit in set point, thus impact torque and electric current all little, also can controlling torque smoothly rise, protection gearing, equipment and personnel.
(4) long service life.Due to noncontacting switch, exceed traditional starter useful life more than 1 times.
(5) be provided with multi-protective function, make equipment operation more reliable, and used modularized design, break down, be easy to find and maintenance.
(6) this soft starter volume is little, and noise is little.
Innovation:
(1) along with the develop rapidly of power electronic device technique, the gap of IGBT and thyristor price is more and more less, therefore this device adopts IGBT as power device, can be synchronous with line voltage, effectively restraining device, at the harmonic wave that starts, moves, stops middle generation, ensures the normal operation of motor.Owing to having used full-control type device IGBT, so soft initiator can not produce harmonic voltage and electric current to electrical network; Use magnetic latching relay to make controller can not produce power consumption after motor runs well.
(2) can be after motor runs well, magnetic latching relay closure makes AC induction motor in normal operation, if AC induction motor is not controlled afterwards, control device is in Non-energy-consumption state, and do not need control device to dispel the heat.
(3) this device has complete defencive function; can monitor in real time operating AC induction motor three-phase current, three-phase voltage by microcontroller chip STM32 simultaneously; accomplish the measurement of the faults such as overcurrent accurately, overload, overvoltage, under-voltage, phase shortage, stall, short circuit and carry out fast operating; can under any fault of motor, protect motor and this device; can replace and in market, be specifically designed to electric motor protective device, thereby save Electric Machine Control and protection switch electrical equipment (CPS).
Brief description of the drawings
Fig. 1 is the structured flowchart of the utility model while being connected with AC induction motor;
Fig. 2 is the circuit diagram of the utility model while being connected with AC induction motor.
Embodiment
Further illustrate in conjunction with the accompanying drawings and embodiments the utility model, as shown in Figure 1, 2, the utility model is by microcontroller chip STM32, and the full-control type power device IGBT of the each phase of corresponding alternating current and magnetic latching relay J form; The input of microcontroller chip STM32 connects AC induction motor through voltage-current sensor, the P1 mouth of microcontroller chip STM32 connects as the G end of the igbt of full-control type power device and the input of magnetic latching relay J, the positive and negative terminal magnetic latching relay J in parallel of igbt, the positive and negative terminal of igbt connects respectively electricity and AC induction motor mutually; Microcontroller chip STM32 carries out programming Control full-control type power device and magnetic latching relay is realized the various control modes of AC induction motor.
Main circuit, by three IGBT and the power diode D reverse parallel connection of corresponding three-phase electricity, is then connected with motor stator series connection.A wherein RC dynamic buffering circuit in parallel in each brachium pontis of three-phase brachium pontis; it is widely used in the circuit of various electronics electronic switching device compositions, has climbing, the function such as power consumption protection switch device of reduction device in switching process of deboost and electric current.Voltage synchronizing signal is detected A phase voltage by the wattage transformer of 220V/5V, then setting it as input signal processes, the middle fracture of output being delivered to single-chip microcomputer, utilizes the interruption logging synchronizing signal moment, as the time reference of output trigger impulse.In processing procedure, filtering part works to eliminate the interference of other signals, can not produce again large phase shifts.The signal of filtering output is amplified through in-phase amplifier, be then input in zero passage comparison circuit.The signal that signal after amplification and zero level obtain more afterwards, is sent to the middle fracture of single-chip microcomputer.When STM32 single-chip microcomputer arrives the moment according to synchronizing signal, utilize software timer to determine the triggering moment of each IGBT, software timer interrupts trigger impulse information to be kept in corresponding registers.IGBT drive circuit is delivered to gate pole, the negative electrode of IGBT again after the control signal from trigger board is amplified, isolated, adopted optical coupler 6M36, pulse transformer two-stage buffer circuit, to improve the antijamming capability of system.In the time that motor runs well, now motor, in full-gear, does not need the operation of control device, so magnetic latching relay will be opened, makes soft initiator in off-position, and not consumed energy, is conducive to energy-conserving and environment-protective.
System adopts modularization method to carry out Software for Design, the groundwork that software need to complete has: system initialization, trigger drive signal interruption service routine, synchronizing signal interrupt service routine, electric motor starting subprogram, motor runtime subroutine, the energy-conservation subprogram of control device, For Diagnosing Faults of Electrical and processing subprogram etc.
Above-described embodiment is preferably one of mode of the utility model; in addition, the utility model can also use other execution modes, it should be noted that; do not departing under conception prerequisite of the present utility model, any apparent replacement is all within protection of the present utility model.
Claims (3)
1. the compound soft initiator of AC induction motor, is characterized in that, described soft initiator is by microcontroller chip STM32, and the full-control type power device IGBT of the each phase of corresponding alternating current and magnetic latching relay form; The input of microcontroller chip STM32 connects AC induction motor through voltage-current sensor, the P1 mouth of microcontroller chip STM32 connects as the G end of the igbt of full-control type power device and the input of magnetic latching relay, the positive and negative terminal magnetic latching relay in parallel of igbt, the positive and negative terminal of igbt connects respectively electricity and AC induction motor mutually; Microcontroller chip STM32 carries out programming Control full-control type power device and magnetic latching relay is realized the various control modes of AC induction motor.
2. the compound soft initiator of AC induction motor according to claim 1, is characterized in that, described each mutually in as igbt reverse parallel connection power diode and the RC dynamic buffering circuit in parallel of full-control type power device IGBT.
3. the compound soft initiator of AC induction motor according to claim 1, is characterized in that, described igbt adopts FGA25N120AN.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420045856.6U CN203775088U (en) | 2014-01-24 | 2014-01-24 | Compound soft starter for AC (alternating current) asynchronous motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420045856.6U CN203775088U (en) | 2014-01-24 | 2014-01-24 | Compound soft starter for AC (alternating current) asynchronous motor |
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| CN203775088U true CN203775088U (en) | 2014-08-13 |
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| CN201420045856.6U Expired - Fee Related CN203775088U (en) | 2014-01-24 | 2014-01-24 | Compound soft starter for AC (alternating current) asynchronous motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112373210A (en) * | 2020-11-12 | 2021-02-19 | 人天通信集团有限公司 | Security printing system |
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- 2014-01-24 CN CN201420045856.6U patent/CN203775088U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112373210A (en) * | 2020-11-12 | 2021-02-19 | 人天通信集团有限公司 | Security printing system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 |
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| CF01 | Termination of patent right due to non-payment of annual fee |