CN101630935A - Automatic control circuit of electric motor - Google Patents

Automatic control circuit of electric motor Download PDF

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Publication number
CN101630935A
CN101630935A CN 200910169273 CN200910169273A CN101630935A CN 101630935 A CN101630935 A CN 101630935A CN 200910169273 CN200910169273 CN 200910169273 CN 200910169273 A CN200910169273 A CN 200910169273A CN 101630935 A CN101630935 A CN 101630935A
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China
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contactor
motor
starting
main contacts
time relay
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CN 200910169273
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Chinese (zh)
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潘祥林
赵偲江
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Individual
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Motor And Converter Starters (AREA)

Abstract

The invention relates to an automatic control circuit of an electric motor, adding a combined capacitor delta connection and a combined resistor short connection on the basis of the method of the original Y-delta control circuit and controlling an overall process of starting, running and stopping of an electric motor by an AC contactor, a time relay, a start button and a stop button, thereby forming a brand-new automatic control circuit of an RC-Y-delta electric motor. The automatic control circuit of the RC-Y-delta electric motor adopts a combined control mode taking the resistor and capacitor combination as a characteristic, which is applied to the control circuit of the electric motor, so as to complete and realize the optimal control of starting, running and stopping of a phase asynchronous electric motor.

Description

Automatic control circuit of electric motor
Technical field
The present invention relates to the control circuit of threephase asynchronous, be specifically related to a kind of high-power asynchronous motor starting, move and stop and power factor compensation and extinguishing arc protection contact circuit not damaged electromotor control circuit.This control circuit is used for the control technology field of motor.
Background technology
At present, be applicable to main circuit voltage at 380 volts, control loop is at Electric Traction control circuits at different levels below 380 volts.Bigger for threephase asynchronous starting inertia, motor power (output) is greater than electricity distribution power transformer 15%, during the motor across-the-line starting networking voltage drop had fluctuation.Its start mode is all adopted traditional autotransformer, or star Y-triangle △ start control circuit, to satisfy motor fluctuation to networking voltage when starting.Autotransformer heaviness, cost height, star-delta starting or other start mode all can't be carried out reactive power compensation when the starting to it; Because motor belongs to the induction reactance electrical appliance.When stopping the motor operation, motor outlet two ends can produce higher instantaneous self-induction kinetic potential, and are bigger to the main contacts damage of its master element, make the instability of reduction in useful life of its electric elements and performance.
Summary of the invention
The purpose of control circuit of the present invention has been to overcome the deficiency of existing application technology, original star--and on the triangle starting circuit, set up and installed one group of resistance and one group of electric capacity (abbreviating the RC circuit as) additional.Be applied in the motor control circuit, finish with realized to the starting, the Optimal Control of moving, stopping of asynchronous motor mutually.
Technical scheme of the present invention is as follows:
A kind of automatic control circuit of electric motor, on the method for former star-delta control circuit, set up combination capacitor delta connection and the combined resistance short circuit method of having installed additional, press tentaculum by exchanging, the time relay, starting, stop button realize to motor starting, move, stop, the control of overall process forms a kind of brand-new RC-Y-△ automatic control circuit of electric motor.
The present invention is made up of major loop, control loop.Wherein
Major loop comprises: three-phase AC asynchronous motor, power circuit breaker, motor move the main contactor main contacts, discharge and recharge or compensate the contactor main contacts, discharge and recharge combination capacitor, secondary starting contactor main contacts, one-level starting or discharge resistor, one-level starting contactor main contacts, motor delta connection operation contactor main contacts;
Control loop comprises: stop button, starting button, one-level starting contactor, compensation contactor, motor operation main contactor, one-level starting time relay, secondary starting time relay, secondary starting contactor, motor delta connection operation contactor, termination time relay.
Circuit relationships of the present invention is: a wherein phase leading-out terminal of power circuit breaker and one-level starting contactor, discharge and recharge or compensate contactor and connect, and be connected the series connection of stop button, starting button, the other end of starting button is connected with the parallel circuits of motor operation main contactor, one-level starting time relay, secondary starting time relay, secondary starting contactor, motor delta connection contactor and termination time relay composition.The three-phase leading-out terminal serial connection motor operation main contactor main contacts of power circuit breaker, motor operation main contactor main contacts leading-out terminal respectively with motor delta connection contactor main contacts end of incoming cables, discharge and recharge or compensate the end of incoming cables of contactor main contacts end of incoming cables, three-phase alternating-current motor and connect, discharge and recharge or compensate contactor main contacts leading-out terminal and be connected to combined capacitor; Motor delta connection contactor main contacts leading-out terminal is respectively with three-phase alternating-current motor leading-out terminal, secondary starting contactor main contacts end of incoming cables and one-level starting contactor main contacts end of incoming cables and connect; Form a short circuit closed circuit between secondary starting contactor main contacts leading-out terminal, with the secondary starting of the star Y connection that satisfies motor; One-level starting contactor leading-out terminal is connected to combined resistance, and the other end of combined resistance is a short-circuit, increases the level starting to realize the string resistance.
RC-Y-△ automatic control circuit of electric motor of the present invention has formed with resistance and appearance and has consisted of the combination of features control mode.Compare with traditional control mode, have following characteristics:
1, by circuit design cleverly, with resistance R, capacitor C is assembled in respectively on the control major loop, realizes the crosstalk resistance, increases level starting motor more stably; Triangle electric capacity connection realizes the terminal compensation to the motor reactive factor in starting process, electric capacity when out of service, capacitance resistance is formed the RC closed circuit, under the effect of motor self induction electromotive force power, form discharging and recharging of RC circuit, harm and the damage of self induction electromotive force to the circuit system components and parts disappears.
2, circuit control system is safe and reliable, and element is not fragile, long service life.
3, electric Katyuan device is formed simply, and cost is low, assembling look into repair convenient and swift.
Description of drawings
Fig. 1 is a RC-Y-△ automatic control circuit of electric motor schematic diagram of the present invention.
Embodiment
Referring to Fig. 1, major loop comprises: three-phase AC asynchronous motor M, power circuit breaker 1, motor operation main contactor main contacts 4-1, discharge and recharge or compensate contactor main contacts 9-1, discharge and recharge combination capacitor 12, motor heating continue protector (FR), secondary starting contactor main contacts 10-1, one-level starting or discharge resistor 13, one-level starting contactor main contacts 8-1, motor delta connection operation contactor main contacts 5-1;
Control loop comprises: stop button 3, starting button 2, one-level starting contactor 8, compensation contactor 9, motor operation main contactor 4, one-level starting time relay 7, secondary starting time relay 11, secondary starting contactor 10, motor delta connection operation contactor 5, termination time relay 6.
PE is that protective earthing, FU are the fuse group.
Three-phase alternating current power supply leading-in end L1, L2, L3, by power circuit breaker 1 realize power supply branch, close control.Power circuit breaker 1 leading-out terminal is serially connected with motor operation main contactor main contacts 4-1, motor operation main contactor main contacts 4-1 leading-out terminal respectively with motor delta connection operation contactor main contacts 5-1 end of incoming cables, discharge and recharge or compensate the end of incoming cables of contactor main contacts 9-1 end of incoming cables, the disconnected relay protector FR end of incoming cables of thermoelectric motivation heat and three-phase alternating-current motor and connect; Discharge and recharge or compensate contactor main contacts 9-1 leading-out terminal and be serially connected with combined capacitor 12, to satisfy power factor compensation and to eliminate of the damage of the higher self induction electromotive force of motor main contacts.Break relay protector (FR) leading-out terminal serial connection of the end of incoming cables of three-phase alternating-current motor and motor heating, motor delta connection operation contactor main contacts 5-1 leading-out terminal connects three-phase alternating-current motor leading-out terminal, secondary starting contactor main contacts 10-1 end of incoming cables and one-level starting contactor main contacts 8-1 end of incoming cables respectively and connects; Form a short circuit closed circuit between secondary starting contactor main contacts 10-1 leading-out terminal, with the secondary starting of the star Y connection that satisfies motor; One-level starting contactor main contacts 8-1 leading-out terminal is serially connected with combined resistance 13, and the other end of combined resistance 13 is a short-circuit, increases the level starting to realize the string resistance.
Concrete enforcement control method and control principle are described:
(1) starting of motor:
Power turn-on circuit breaker 1 energized.Press starting button 2, motor operation main contactor 4, moving the closing of motor operation main contactor main contacts 4-1, power connection motor end of incoming cables, the A point, the B point, the D point, connect between the O point, motor operation main contactor often leaves that auxilliary contact 4-2 is moving to be closed, B point and D point are connected from locking wire, termination time relay 6, termination time relay outage time-delay break contact 6-1 closure, make the A point, one-level starting time relay power time-delay break contact 7-2, the auxilliary normally closed break contact 5-3 of motor delta connection operation contactor, circuit is connected between the O point, one-level starting contactor 8, compensation contactor 9, one-level starting contactor main contacts 8-1, moving the closing in compensation contactor main contacts 9-1 while contact, the starting of combined resistance 13 one-levels, combination capacitor 12 drops into the discharge compensation.
When pressing starting button 2, one-level starting time relay 7, one-level starting time relay power time-delay break contact 7-2 time-delay disconnects (opening time is adjustable), and one-level starting contactor 8 dead electricity, one-level starting contactor main contacts 8-1 disconnect, the excision of combined resistance current limit starting.
After one-level starting time relay 7 gets the electric several seconds, the relay power timing closing contact 7-1 timing closing of one-level starting time, make circuit connection between B point, D point, secondary starting time relay power time-delay break contact 11-1, the auxilliary normally closed break contact 5-2 of motor delta connection operation contactor, O point, secondary starting contactor 10, secondary starting time relay 11 simultaneously electric, secondary starting contactor main contacts 10-1 is moving to be closed, motor secondary star Y starting.After several seconds, secondary starting time relay power time-delay break contact 11-1 disconnects, secondary starting contactor 10 dead electricity, and secondary starting contactor main contacts 10-1 disconnects, secondary star Y proceed-to-send.Secondary starting time while relay power time-delay make contact 11-2 closure, make the B point, the D point, the one-level starting contactor is assisted normally closed break contact 8-2, circuit between auxilliary normally closed break contact 10-2 of secondary starting contactor and the O point is connected, motor delta connection operation contactor 5, motor delta connection operation contactor main contacts 5-1 closure, the closed self-locking of auxilliary contact 5-4 often left by motor delta connection operation contactor, motor switches to triangle delta connection method, be in running status, two motor delta connections are moved the normally closed auxilliary contact 5-2 of contactor simultaneously, 5-3 disconnects, one-level starting contactor 8, compensation contactor 9, motor operation main contactor 4, one-level starting time relay 7, secondary starting time relay 11, secondary starting contactor 10 all is in power failure state.
(2) stopping of motor:
Press stop button 3, A point, B point disconnect, motor operation main contactor 4, motor delta connection operation contactor 5 dead electricity, motor operation main contactor main contacts 4-1, motor delta connection operation contactor main contacts 5-1 disconnection, motor dead electricity, rotating speed descend.Simultaneously, motor operation main contactor often leaves auxilliary contact 4-2, motor delta connection operation contactor and often opens auxilliary contact 5-4 disconnections that reset, and self-locking cancellation motor operation main contactor 4, one-level starting time relay 7, secondary starting time relay 11, secondary starting contactor 10, motor delta connection are moved contactor 5, termination time relay 6 is in decompression and does not work.Closure and termination time relay outage time-delay break contact 6-1 also do not disconnect because the normally closed auxilliary contact 5-3 of motor delta connection operation contactor, one-level starting time relay power time-delay break contact 7-2 reset, and circuit is connected between A point, termination time relay outage time-delay break contact 6-1, one-level starting time relay power time-delay break contact 7-2, the motor delta connection operation normally closed auxilliary contact 5-3 of contactor and O point.One-level starting contactor 8, compensation contactor 9 recuperation electricity, to making one-level starting contactor main contacts 8-1, the closed combined resistance 13 of compensation contactor main contacts 9-1, combination capacitor 12 is heavily devoted oneself to work.When motor was initially shut down, combination capacitor 12 charging under the effect of electromotive force and combined resistance 13 string resistances, short circuit made its motor winding discharge.After several seconds, termination time relay outage time-delay break contact 6-1 finally disconnects recovery and often opens, and the Motor Control process stops.

Claims (4)

1, a kind of automatic control circuit of electric motor is made up of major loop, control loop, it is characterized in that:
Major loop comprises: three-phase AC asynchronous motor, power circuit breaker, motor move the main contactor main contacts, discharge and recharge or compensate the contactor main contacts, discharge and recharge combination capacitor, secondary starting contactor main contacts, one-level starting or discharge resistor, one-level starting contactor main contacts, motor delta connection operation contactor main contacts; Control loop comprises: stop button, starting button, one-level starting contactor, compensation contactor, motor operation main contactor, one-level starting time relay, secondary starting time relay, secondary starting contactor, motor delta connection operation contactor, termination time relay;
A wherein phase leading-out terminal of described power circuit breaker and one-level starting contactor, discharge and recharge or compensate contactor and connect, and be connected the series connection of stop button, starting button, the other end of starting button is connected with the parallel circuits of motor operation main contactor, one-level starting time relay, secondary starting time relay, secondary starting contactor, motor delta connection contactor and termination time relay composition; The three-phase leading-out terminal serial connection motor operation main contactor main contacts of power circuit breaker, motor operation main contactor main contacts leading-out terminal respectively with motor delta connection contactor main contacts end of incoming cables, discharge and recharge or compensate the end of incoming cables of contactor main contacts end of incoming cables, three-phase alternating-current motor and connect, discharge and recharge or compensate contactor main contacts leading-out terminal and be connected to combined capacitor; Motor delta connection contactor main contacts leading-out terminal is respectively with three-phase alternating-current motor leading-out terminal, secondary starting contactor main contacts end of incoming cables and one-level starting contactor main contacts end of incoming cables and connect; Form a short circuit closed circuit between secondary starting contactor main contacts leading-out terminal, with the secondary starting of the star Y connection that satisfies motor; One-level starting contactor leading-out terminal is connected to combined resistance, and the other end of combined resistance is a short-circuit, increases the level starting to realize the string resistance.
2, automatic control circuit of electric motor according to claim 1 is characterized in that: have the disconnected relay protector of a heat at the place, end of incoming cables of described three-phase alternating-current motor, the end of incoming cables of motor is connected in series mutually with the leading-out terminal of the disconnected relay protector of this heat.
3, automatic control circuit of electric motor according to claim 1 is characterized in that: described motor operation main contactor main contacts, auxilliary contact often left by motor operation main contactor, motor delta connection operation contactor main contacts, auxilliary contact often left by motor delta connection operation contactor, discharge and recharge or compensate the contactor main contacts, one-level starting contactor main contacts, one-level starting time relay power timing closing contact, secondary starting contactor main contacts, secondary starting time relay power time-delay make contact, termination time relay outage time-delay break contact is normally opened contact.
4, automatic control circuit of electric motor according to claim 1 is characterized in that: the auxilliary normally closed break contact of motor delta connection operation contactor, the normally closed auxilliary contact of motor delta connection operation contactor, one-level starting time relay power time-delay break contact, secondary starting time relay power time-delay break contact, the auxilliary normally closed break contact of one-level starting contactor, the auxilliary normally closed break contact of secondary starting contactor are normally-closed contact.
CN 200910169273 2009-08-26 2009-08-26 Automatic control circuit of electric motor Pending CN101630935A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200910169273 CN101630935A (en) 2009-08-26 2009-08-26 Automatic control circuit of electric motor

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Application Number Priority Date Filing Date Title
CN 200910169273 CN101630935A (en) 2009-08-26 2009-08-26 Automatic control circuit of electric motor

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CN101630935A true CN101630935A (en) 2010-01-20

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104320040A (en) * 2014-11-10 2015-01-28 吐鲁番地区万隆电气有限公司 Triangular starting and star-shaped operation energy-saving control cabinet for pumping unit and control method thereof
CN105715451A (en) * 2014-12-05 2016-06-29 成都阜特科技股份有限公司 Yaw control circuit of wind generating set
CN105720863A (en) * 2014-12-05 2016-06-29 成都阜特科技股份有限公司 Yaw control circuit for wind generating set
CN104320040B (en) * 2014-11-10 2017-01-04 吐鲁番地区万隆电气有限公司 Oil pumper triangle starts star energy saving in running switch board and control method thereof
CN107329085A (en) * 2017-08-10 2017-11-07 中国船舶电站设备有限公司 Load box major loop star is connected switching control system and computational methods with triangle
CN109149756A (en) * 2018-08-30 2019-01-04 北京机械设备研究所 A kind of generating set starting 24V and 48V conversion control circuit and method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104320040A (en) * 2014-11-10 2015-01-28 吐鲁番地区万隆电气有限公司 Triangular starting and star-shaped operation energy-saving control cabinet for pumping unit and control method thereof
CN104320040B (en) * 2014-11-10 2017-01-04 吐鲁番地区万隆电气有限公司 Oil pumper triangle starts star energy saving in running switch board and control method thereof
CN105715451A (en) * 2014-12-05 2016-06-29 成都阜特科技股份有限公司 Yaw control circuit of wind generating set
CN105720863A (en) * 2014-12-05 2016-06-29 成都阜特科技股份有限公司 Yaw control circuit for wind generating set
CN105720863B (en) * 2014-12-05 2018-12-25 成都阜特科技股份有限公司 A kind of wind generating set yaw control circuit
CN105715451B (en) * 2014-12-05 2019-04-26 成都阜特科技股份有限公司 A kind of wind generating set yaw control circuit
CN107329085A (en) * 2017-08-10 2017-11-07 中国船舶电站设备有限公司 Load box major loop star is connected switching control system and computational methods with triangle
CN109149756A (en) * 2018-08-30 2019-01-04 北京机械设备研究所 A kind of generating set starting 24V and 48V conversion control circuit and method

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Application publication date: 20100120