CN106452197A - Motor electromagnetic starting system - Google Patents

Motor electromagnetic starting system Download PDF

Info

Publication number
CN106452197A
CN106452197A CN201611090951.8A CN201611090951A CN106452197A CN 106452197 A CN106452197 A CN 106452197A CN 201611090951 A CN201611090951 A CN 201611090951A CN 106452197 A CN106452197 A CN 106452197A
Authority
CN
China
Prior art keywords
conversion
processing unit
central processing
chip
resistance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201611090951.8A
Other languages
Chinese (zh)
Inventor
田勇
郎福成
张小辉
黄旭
李思彬
齐欣
刘鹤丹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201611090951.8A priority Critical patent/CN106452197A/en
Publication of CN106452197A publication Critical patent/CN106452197A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P1/00Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/16Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
    • H02P1/26Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor

Abstract

The invention belongs to the technical field of motor starting, and particularly relates to a motor electromagnetic starting system which has power quality monitoring and power factor dynamic adjusting functions. The motor electromagnetic starting system has the advantages of simple and reasonable structure and convenience in use, powerful controlling and data processing capability of a DSP (digital signal processor) can be utilized effectively, concentration and protection of motor starting process are realized, and the motor electromagnetic starting system has power quality monitoring and power factor dynamic adjusting functions. The system breaks existing technical concepts, combines conventional motor electromagnetic starting technology with reactive power compensation technology and has the advantages of simple structure, high stability, convenience in operation and high response speed.

Description

Motor electromagnetic start system
Technical field
The invention belongs to motor starting technical field, more particularly, to a kind of motor electromagnetic start system, there is electric energy The motor electromagnetic start system of quality-monitoring and power factor dynamic regulation function.
Background technology
Motor is electric energy maximum consumption body, the important motivity source in consuming about the 70% of industrial electric energy and producing, Play an important role in industrial development and people's lives.Electromagnetic start is that extensive mode is made in starting process of motor use, The startup of motor and braking can not only be controlled, also there is malfunction monitoring and defencive function.The electromagnetism using at present Activation system single function is it is impossible to realize electric energy quality monitoring and power factor dynamic regulation.
Content of the invention
For above-mentioned problems of the prior art, the invention provides a kind of motor electromagnetic start system, purpose It is that a kind of motor electromagnetic start system with electric energy quality monitoring and power factor dynamic regulation function is provided.
In order to reach foregoing invention purpose, the present invention is achieved in the following ways:
Motor electromagnetic start system, is to be connected with disconnecting switch by three phase mains warp, disconnecting switch contacts with AC vacuum Device is connected, and AC vacuum contactor is connected with motor three-phase windings;The primary side of transformator through electric fuse with exchange Vacuum contactor is arbitrarily biphase to be connected, and the secondary side of transformator is divided into two branch roads, and branch road A is through relay and AC vacuum Catalyst is connected, branch road B and central processing unit, voltage transformer, current transformer, temperature sensor, signal processing circuit It is connected with the power supply of display screen;The connecting wire of three phase mains and disconnecting switch passes through the loop configuration of current transformer, temperature Degree sensor is pasted onto in moving contact, static contact and the internal connecting wire of AC vacuum contactor;Voltage transformer, electric current are mutual Sensor, temperature sensor are connected with signal processing circuit, and signal processing circuit is connected with central processing unit;Operating unit and Central processing unit is connected, and central processing unit is connected with display screen and relay;Relay is connected with AC vacuum contactor Connect, signaling conversion circuit is connected with central processing unit, thyristor groups are connected with signaling conversion circuit, thyristor groups and electric capacity Device group is connected.
The input of described operating unit is button switch.
Motor electromagnetic start system, be by three phase mains outfan through voltage transformer and disconnecting switch input End is connected, and the outfan of disconnecting switch is connected with the input of AC vacuum contactor, the output of AC vacuum contactor End is connected with motor three-phase windings;The primary side of transformator through electric fuse and AC vacuum contactor input appoint Meaning is biphase to be connected, and the secondary side of transformator is divided into two branch roads, and branch road A is through the control of relay and AC vacuum contactor End is connected, branch road B and central processing unit, voltage transformer, current transformer, temperature sensor, signal processing circuit and aobvious The power input of display screen is connected;The connecting wire of three phase mains and disconnecting switch passes through the loop configuration of current transformer, Temperature sensor is pasted onto in moving contact, static contact and the internal connecting wire of AC vacuum contactor;Voltage transformer, electric current Transformer, the outfan of temperature sensor are connected with the input of signal processing circuit, and the outfan of signal processing circuit is equal It is connected with the input of central processing unit.The input of operating unit is button switch, the outfan of operating unit and central authorities The input of processor is connected, and central processing unit outfan is connected with the control end of display screen and relay respectively;Relay The outfan of device is connected with the control end of AC vacuum contactor, the input of signaling conversion circuit and central processing unit defeated Go out end to be connected, the control end of thyristor groups is connected with the outfan of signaling conversion circuit, the outfan of thyristor groups with electricity The both positive and negative polarity of container group is connected.
Motor electromagnetic start method, comprises the following steps:Operating unit instructs according to the demand input external world of motor, Extraneous instruction is converted into output control signal and drives the actuating of relay by central processing unit, and then drives AC vacuum contactor Carry out point/closing operation, motor starting after AC vacuum contactor closure, the detection of voltage transformer summation current transformer defeated Go out to be sent to central processing unit after signal processing circuit and enter row operation, if systematic parameter is just normal in the range of safety value Start, otherwise start and stop;Central processing unit calculates three-phase voltage, current first harmonics and each harmonic in real time using fft algorithm to be had Valid value and phase angle, can obtain active power be, reactive power and power factor;Requirement central processing unit according to system sends and controls The turn-on logic of order-driven thyristor groups, realizes controlling the switching of capacitor bank, reaches the dynamic regulation work(to power factor Energy.
Described fft algorithm refers to fast fourier transform algorithm, that is, utilize computer to calculate discrete Fourier transform DFT's Efficiently, the general designation of quick calculation method, abbreviation FFT;Computer can be made to calculate needed for discrete Fourier transform using this algorithm The multiplication number of times wanted is greatly reduced, and the number of sampling points N being particularly transformed is more, and the saving of fft algorithm amount of calculation is more notable.
Described signal processing circuit, signaling conversion circuit includes conversion chip KC 101 diode D1, diode D2, resistance R1, resistance R2, resistance R3, resistance R5, resistance R6, resistance R7, electric capacity C1, electric capacity C2, electric capacity C3, optocoupler PE, IGCT Q1 and Power supply;Wherein the signal output part of central processing unit is connected with 1,2 binding posts of conversion chip KC 101, conversion chip KC 101 binding post 5 is through the input terminal 4 of resistance R1 and optocoupler PE, binding post 12 warp respectively of conversion chip KC 101 Cross electric capacity C1 to be connected with the binding post 9 of conversion chip KC 101, the binding post 10 of conversion chip KC 101 respectively through Electric capacity C2 is connected with the binding post 13 of conversion chip KC 101, and the binding post 7 of conversion chip KC 101 is through electric capacity C3 It is connected with the ground terminal GND of power supply, the binding post 6 of conversion chip KC 101 is through the ground terminal of resistance R2 and power supply GND is connected, and the binding post 8 of conversion chip KC 101 is connected with ground terminal GND, the terminals of conversion chip KC 101 Son 11 is connected with the colelctor electrode of IGCT Q1 after resistance R5, diode D2, the binding post 15 of conversion chip KC 101 It is connected with the base stage of IGCT Q1 through resistance R6, the binding post 16 of conversion chip KC 101 is through resistance R7 and IGCT The base stage of Q1 is connected, and the binding post 14 of conversion chip KC 101 is connected with the emitter stage of IGCT Q1, diode D1's One end is connected with the binding post 11 of conversion chip KC 101, the wiring of the other end of diode D1 and conversion chip KC 101 Terminal 14 is connected, and one end of resistance R3 is connected with the base stage of IGCT Q1, the other end of resistance R3 and conversion chip KC 101 binding post 14 is connected, and the input terminal 3 of optocoupler PE is connected with power supply VCC.
Described three-phase voltage current detection process includes:The primary side induction system electricity of voltage transformer summation current transformer Pressure, electric current, the secondary side output voltage signal of voltage transformer summation current transformer, voltage transformer summation current transformer is secondary Side output voltage signal is 5V voltage signal, and the voltage signal that central processing unit can receive is 0-3.3V, transformer output Signal carries out after light-coupled isolation and voltage conversion being the receivable signal of central processing unit through signal processing circuit, in being sent to Central processor.
Advantages of the present invention and beneficial effect are:
Motor electromagnetic start system of the present invention has simple and reasonable, easy to use feature, powerful using dsp processor Control data disposal ability, realize to starting process of motor collection neutralize protection, there is electric energy quality monitoring and work(simultaneously Rate factor dynamic regulation function.System breaks through conventional art theory, by traditional motor electromagnetic start technology and reactive-load compensation Technology combines, and has that structure is simple, good stability, easy to operate, the advantage such as fast response time.
Below in conjunction with the accompanying drawings and specific embodiment, the present invention is described in detail.
Brief description
Fig. 1 is present configuration schematic diagram;
Fig. 2 is signaling conversion circuit schematic diagram in the present invention.
Specific embodiment
The present invention is a kind of motor electromagnetic start system, is that one kind has electric energy quality monitoring and power factor is dynamically adjusted The motor electromagnetic start system of section function.
As shown in figure 1, Fig. 1 is present configuration schematic diagram.Motor electromagnetic start system includes three phase mains, keeps apart Pass, AC vacuum contactor, motor, central processing unit, electric fuse, transformator, relay, voltage transformer, Current Mutual Inductance Device, temperature sensor, signal processing circuit, operating unit, display screen, signaling conversion circuit, thyristor groups, capacitor bank.Its The outfan of middle three phase mains is connected with the input of disconnecting switch through voltage transformer, the outfan of disconnecting switch and friendship The input of flow vacuum catalyst is connected, and the outfan of AC vacuum contactor is connected with motor three-phase windings.Transformation The primary side of device is connected with the arbitrarily biphase of the input of AC vacuum contactor through electric fuse, and the secondary side of transformator divides For two branch roads, branch road A is connected with the control end of AC vacuum contactor through relay, branch road B and central processing unit, electricity Pressure transformer, current transformer, temperature sensor, signal processing circuit are connected with the power input of display screen, three-phase electricity The connecting wire of source and disconnecting switch passes through the loop configuration of current transformer, and temperature sensor is pasted onto AC vacuum contactor Moving contact, in static contact and internal connecting wire;Voltage transformer, current transformer, the outfan of temperature sensor and letter The input of number process circuit is connected, and the outfan of signal processing circuit is all connected with the input of central processing unit.Behaviour The input making unit is button switch, and the outfan of operating unit is connected with the input of central processing unit, and central authorities are processed Device outfan is connected with the control end of display screen and relay respectively;The outfan of relay and the control of AC vacuum contactor End processed is connected, and the input of signaling conversion circuit is connected with the outfan of central processing unit, the control end of thyristor groups and The outfan of signaling conversion circuit is connected, and the outfan of thyristor groups is connected with the both positive and negative polarity of capacitor bank.
Motor electromagnetic start system work process describes:Operating unit instructs according to the demand input external world of motor, Extraneous instruction is converted into output control signal and drives the actuating of relay by central processing unit, and then drives AC vacuum contactor Carry out point/closing operation, motor starting after AC vacuum contactor closure, the detection of voltage transformer summation current transformer defeated Go out to be sent to central processing unit after signal processing circuit and enter row operation, if systematic parameter is just normal in the range of safety value Start, otherwise start and stop.Central processing unit utilizes FFT(Fast Fourier transform, Fast Fourier Transform, letter Claim FFT)Algorithm calculates three-phase voltage, current first harmonics and each harmonic virtual value and phase angle in real time, can obtain active power be, idle Power and power factor.Requirement central processing unit according to system sends the turn-on logic that control instruction drives thyristor groups, real Now control the switching of capacitor bank, reach the dynamic regulation function to power factor.
Described FFT(Fast Fourier Transform)Algorithm refers to fast fourier transform algorithm, that is, using meter Calculation machine calculates discrete Fourier transform(DFT efficient, quick calculation method general designation), abbreviation FFT.Can be made using this algorithm The multiplication number of times that computer calculates required for discrete Fourier transform is greatly reduced, and the number of sampling points N being particularly transformed is more, The saving of fft algorithm amount of calculation is more notable.
Described signal processing circuit, as shown in Fig. 2 signaling conversion circuit include conversion chip KC 101 diode D1, Diode D2, resistance R1, resistance R2, resistance R3, resistance R5, resistance R6, resistance R7, electric capacity C1, electric capacity C2, electric capacity C3, optocoupler PE, IGCT Q1, power supply, the wherein signal output part of central processing unit are connected with 1,2 binding posts of conversion chip KC 101 Connect, through the input terminal 4 of resistance R1 and optocoupler PE, conversion chip KC 101 connects for the binding post 5 of conversion chip KC 101 Line terminals 12 are connected with the binding post 9 of conversion chip KC 101 respectively through electric capacity C1, the wiring of conversion chip KC 101 Terminal 10 is connected with the binding post 13 of conversion chip KC 101 respectively through electric capacity C2, the terminals of conversion chip KC 101 Son 7 is connected with the ground terminal GND of power supply through electric capacity C3, the binding post 6 of conversion chip KC 101 through resistance R2 and The ground terminal GND of power supply is connected, and the binding post 8 of conversion chip KC 101 is connected with ground terminal GND, conversion chip The binding post 11 of KC 101 is connected with the colelctor electrode of IGCT Q1 after resistance R5, diode D2, conversion chip KC 101 binding post 15 is connected with the base stage of IGCT Q1 through resistance R6, binding post 16 warp of conversion chip KC 101 The base stage crossing resistance R7 with IGCT Q1 is connected, the binding post 14 of conversion chip KC 101 and the emitter stage phase of IGCT Q1 Connect, one end of diode D1 is connected with the binding post 11 of conversion chip KC 101, the other end of diode D1 and conversion The binding post 14 of chip KC 101 is connected, and one end of resistance R3 is connected with the base stage of IGCT Q1, and resistance R3's is another End is connected with the binding post 14 of conversion chip KC 101, and the input terminal 3 of optocoupler PE is connected with power supply VCC.
Three-phase voltage current detection process describes:The primary side induction system voltage of voltage transformer summation current transformer, Electric current, the secondary side output voltage signal of voltage transformer summation current transformer, voltage transformer summation current transformer secondary side Output voltage signal is 5V voltage signal, and the voltage signal that central processing unit can receive is 0-3.3V, the letter of transformer output Number it is the receivable signal of central processing unit after signal processing circuit carries out light-coupled isolation and voltage conversion, be sent to central authorities Processor.

Claims (7)

1. motor electromagnetic start system, is characterized in that:Three phase mains warp is connected with disconnecting switch, disconnecting switch with exchange true Empty catalyst is connected, and AC vacuum contactor is connected with motor three-phase windings;The primary side of transformator is through electric fuse Arbitrarily biphase with AC vacuum contactor be connected, the secondary side of transformator is divided into two branch roads, and branch road A is through relay and friendship Flow vacuum catalyst is connected, branch road B and central processing unit, voltage transformer, current transformer, temperature sensor, at signal Reason circuit is connected with the power supply of display screen;The connecting wire of three phase mains and disconnecting switch passes through the ring junction of current transformer Structure, temperature sensor is pasted onto in moving contact, static contact and the internal connecting wire of AC vacuum contactor;Voltage transformer, Current transformer, temperature sensor are connected with signal processing circuit, and signal processing circuit is connected with central processing unit;Operation Unit is connected with central processing unit, and central processing unit is connected with display screen and relay;Relay is contacted with AC vacuum Device is connected, and signaling conversion circuit is connected with central processing unit, and thyristor groups are connected with signaling conversion circuit, thyristor groups It is connected with capacitor bank.
2. the motor electromagnetic start system stated according to claim 1, is characterized in that:The input of described operating unit be by Button switch.
3. the motor electromagnetic start system stated according to claim 1, is characterized in that:The outfan of described three phase mains passes through Voltage transformer is connected with the input of disconnecting switch, the input phase of the outfan of disconnecting switch and AC vacuum contactor Connect, the outfan of AC vacuum contactor is connected with motor three-phase windings;The primary side of transformator through electric fuse and The arbitrarily biphase of the input of AC vacuum contactor is connected, and the secondary side of transformator is divided into two branch roads, and branch road A is through adopting Electrical equipment is connected with the control end of AC vacuum contactor, branch road B and central processing unit, voltage transformer, current transformer, temperature Degree sensor, signal processing circuit are connected with the power input of display screen;Three phase mains and the connecting wire of disconnecting switch Through the loop configuration of current transformer, temperature sensor is pasted onto moving contact, static contact and the inside of AC vacuum contactor In connecting wire;Voltage transformer, current transformer, the outfan of temperature sensor are connected with the input of signal processing circuit Connect, the outfan of signal processing circuit is all connected with the input of central processing unit;The input of operating unit is opened for button Close, the outfan of operating unit is connected with the input of central processing unit, central processing unit outfan respectively with display screen and The control end of relay is connected;The outfan of relay is connected with the control end of AC vacuum contactor, signal conversion electricity The input on road is connected with the outfan of central processing unit, the outfan phase of the control end of thyristor groups and signaling conversion circuit Connect, the outfan of thyristor groups is connected with the both positive and negative polarity of capacitor bank.
4. motor electromagnetic start method, is characterized in that:Comprise the following steps:Operating unit inputs outer according to the demand of motor Boundary instructs, and extraneous instruction is converted into output control signal and drives the actuating of relay by central processing unit, and then drives AC vacuum Catalyst carries out point/closing operation, motor starting after AC vacuum contactor closure, and voltage transformer summation current transformer is examined The output surveyed is sent to central processing unit after signal processing circuit and enters row operation, if systematic parameter is in the range of safety value Just normal startup, otherwise starts and stops;Central processing unit calculates three-phase voltage, current first harmonics and each time in real time using fft algorithm Harmonic wave virtual value and phase angle, can obtain active power be, reactive power and power factor;Sent out according to the requirement central processing unit of system Send control instruction to drive the turn-on logic of thyristor groups, realize controlling the switching of capacitor bank, reach dynamic to power factor Regulatory function.
5. motor electromagnetic start method according to claim 4, is characterized in that:Described fft algorithm refers in quick Fu Leaf transformation algorithm, that is, utilize computer to calculate efficient, quick calculation method the general designation of discrete Fourier transform DFT, referred to as FFT;Using this algorithm can make computer calculate discrete Fourier transform required for multiplication number of times be greatly reduced, particularly by The number of sampling points N of conversion is more, and the saving of fft algorithm amount of calculation is more notable.
6. motor electromagnetic start method according to claim 4, is characterized in that:Described signal processing circuit, signal turns Change circuit include conversion chip KC 101 diode D1, diode D2, resistance R1, resistance R2, resistance R3, resistance R5, resistance R6, Resistance R7, electric capacity C1, electric capacity C2, electric capacity C3, optocoupler PE, IGCT Q1 and power supply;The signal output part of wherein central processing unit It is connected with 1,2 binding posts of conversion chip KC 101, the binding post 5 of conversion chip KC 101 is through resistance R1 and optocoupler The input terminal 4 of PE, the binding post 12 of conversion chip KC 101 is respectively through the wiring of electric capacity C1 and conversion chip KC 101 Terminal 9 is connected, and the binding post 10 of conversion chip KC 101 is respectively through the terminals of electric capacity C2 and conversion chip KC 101 Son 13 is connected, and the binding post 7 of conversion chip KC 101 is connected with the ground terminal GND of power supply through electric capacity C3, conversion The binding post 6 of chip KC 101 is connected with the ground terminal GND of power supply through resistance R2, the wiring of conversion chip KC 101 Terminal 8 is connected with ground terminal GND, the binding post 11 of conversion chip KC 101 after resistance R5, diode D2 with crystalline substance The colelctor electrode of brake tube Q1 is connected, and the binding post 15 of conversion chip KC 101 is connected with the base stage of IGCT Q1 through resistance R6 Connect, the binding post 16 of conversion chip KC 101 is connected with the base stage of IGCT Q1 through resistance R7, conversion chip KC 101 Binding post 14 be connected with the emitter stage of IGCT Q1, the binding post of one end of diode D1 and conversion chip KC 101 11 are connected, and the other end of diode D1 is connected with the binding post 14 of conversion chip KC 101, one end of resistance R3 with brilliant The base stage of brake tube Q1 is connected, and the other end of resistance R3 is connected with the binding post 14 of conversion chip KC 101, optocoupler PE's Input terminal 3 is connected with power supply VCC.
7. motor electromagnetic start method according to claim 4, is characterized in that:Described three-phase voltage current detection process Including:The primary side induction system voltage of voltage transformer summation current transformer, electric current, voltage transformer summation current transformer Secondary side output voltage signal, voltage transformer summation current transformer secondary side output voltage signal is 5V voltage signal, central authorities The voltage signal that processor can receive is 0-3.3V, and the signal of transformer output carries out light-coupled isolation through signal processing circuit With after voltage conversion be the receivable signal of central processing unit, be sent to central processing unit.
CN201611090951.8A 2016-12-01 2016-12-01 Motor electromagnetic starting system Pending CN106452197A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611090951.8A CN106452197A (en) 2016-12-01 2016-12-01 Motor electromagnetic starting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201611090951.8A CN106452197A (en) 2016-12-01 2016-12-01 Motor electromagnetic starting system

Publications (1)

Publication Number Publication Date
CN106452197A true CN106452197A (en) 2017-02-22

Family

ID=58222922

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201611090951.8A Pending CN106452197A (en) 2016-12-01 2016-12-01 Motor electromagnetic starting system

Country Status (1)

Country Link
CN (1) CN106452197A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108988691A (en) * 2017-05-31 2018-12-11 徐州安邦信汽车电机科技有限公司 Electric motor of automobile soft activator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000354398A (en) * 1999-06-10 2000-12-19 Meidensha Corp Protector for generator
CN101098078A (en) * 2007-07-05 2008-01-02 耿华虎 Explosion-proof vacuum wattless power compensation electromagnetic starter for mining
CN102074963A (en) * 2011-01-17 2011-05-25 北京清电华力电气自动化科技有限公司 Intelligent reactive compensation comprehensive control device
CN206389304U (en) * 2016-12-01 2017-08-08 国网辽宁省电力有限公司电力科学研究院 Motor electromagnetic start system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000354398A (en) * 1999-06-10 2000-12-19 Meidensha Corp Protector for generator
CN101098078A (en) * 2007-07-05 2008-01-02 耿华虎 Explosion-proof vacuum wattless power compensation electromagnetic starter for mining
CN102074963A (en) * 2011-01-17 2011-05-25 北京清电华力电气自动化科技有限公司 Intelligent reactive compensation comprehensive control device
CN206389304U (en) * 2016-12-01 2017-08-08 国网辽宁省电力有限公司电力科学研究院 Motor electromagnetic start system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
邓醉杰: "基于DSP的三相10KW应急电源的研究与设计", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108988691A (en) * 2017-05-31 2018-12-11 徐州安邦信汽车电机科技有限公司 Electric motor of automobile soft activator

Similar Documents

Publication Publication Date Title
CN103647458B (en) Frequency conversion system and carry out the method and apparatus of precharge to the high voltage converter in it
CN105703689B (en) The two-way frequency conversion speed-adjusting system of high-power brushless double-fed three level of machine
CN105226610B (en) A kind of Transformer Close excitation surge current arrester
CN202135054U (en) DC multi power supply conversion apparatus
CN101299572A (en) Pass-by apparatus for high voltage frequency transformer
CN103166476A (en) Alternating current numerical control pressure regulating and current controlling transmission system
CN104218639A (en) Electric system of charge pole of stereoscopic garage
CN106452197A (en) Motor electromagnetic starting system
CN206389304U (en) Motor electromagnetic start system
CN105634025A (en) Grid-connected inversion device in direct current microgrid
CN205039524U (en) Transformer combined floodgate excitation surge current annihilator
CN206759039U (en) A kind of direct current on-off device based on LC in parallel
CN204012651U (en) A kind of direct current leakage protection circuit
CN202931210U (en) Power supply unit for testing of electric locomotive
CN203457068U (en) Novel dual-mode bidirectional converter
CN208112528U (en) A kind of DC machine control device based on integrated circuit control technology
CN203674723U (en) High-voltage wattless power intelligent compensation device
CN206878551U (en) AC power PLC switching devices free of discontinuities
CN207483106U (en) A kind of elevator emergency safety control
CN207426673U (en) The hardware circuit of control and protective switch equipment
CN205265585U (en) Irreversible bidirectional thyristor system of three -phase
CN104143811A (en) Direct-current electric leakage protection circuit
CN103323789A (en) Electric fetching and monitoring circuit of auxiliary power supply in data center machine room power supply test
CN107068506A (en) The anti-power transmission automatic disconnecting device of power distribution network low pressure
CN207543022U (en) A kind of high-voltage frequency conversion and speed-adjusting device

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20170222