CN1722603A - Method and apparatus for controlling electrical machinery soft-start and soft-stop - Google Patents
Method and apparatus for controlling electrical machinery soft-start and soft-stop Download PDFInfo
- Publication number
- CN1722603A CN1722603A CNA2004100528983A CN200410052898A CN1722603A CN 1722603 A CN1722603 A CN 1722603A CN A2004100528983 A CNA2004100528983 A CN A2004100528983A CN 200410052898 A CN200410052898 A CN 200410052898A CN 1722603 A CN1722603 A CN 1722603A
- Authority
- CN
- China
- Prior art keywords
- voltage
- motor
- soft
- signal
- current
- 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
Links
Images
Landscapes
- Motor And Converter Starters (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
This invention discloses a method for controlling motor soft starting or soft stopping, comprising the following steps: entering starting or stopping course, outputting the work voltage to motor through silicon controlled; controlling angle of flow of silicon thyristor according to the predetermining motor voltage increasing or lowering curse; sampling voltage and current signal via current transformer; comparing the sampled signal and predetermining signal to test whether the present voltage current signal is balancing; adjusting the angle of flow of thyristor via feedback signal of three-phrase trigger; when the torsion of motor achieve nominal torsion( when starting), placing the work voltage in byline contactor, then output to motor, or when the voltage decreases to zero( when soft stopping), the course of soft stopping ends. The invention also provides a device used for above method to increase the safety of motor starting and stopping.
Description
Technical field
The present invention relates to control the method and apparatus that motor opens, more particularly, relate to a kind of method and apparatus that uses controllable silicon to control electric machine soft starting.
Background technology
In industrial circles such as metallurgy, chemical industry, building, mine, use motor device widely, wherein the most commonly used is mouse cage AC type asynchronous machine.This kind motor is that back-emf is main load, promptly is to use back-emf to come the balance external making alive.When motor starting, back-emf can increase and becomes big gradually along with the rotating speed of rotor, so the impulse current during starting is very big.When capacity motor is big, can cause the safe operation of disturbing or even endangering electrical network to electrical network and other loads.In order to address this problem, the voltage when needing to use starting to control starting, the method for control has multiple, such as early stage auto-induction voltage-reduced starting mode, star-triangle conversion starting or the like.Popular mode is to use the SCR AC voltage-regulating technique at present.It is the renewal product of star-triangle conversion regime, auto-induction voltage-reduced starting.
Summary of the invention
The purpose of this invention is to provide the angle of flow that a kind of utilization is serially connected with the thyristor of the soft-starter control inside between power supply and the controlled motor, the motor input voltage is started from scratch rise gradually, until the method and apparatus of proceed-to-send with the preset function relation.It can more accurately control the variation of described electric motor starting voltage and current.In addition, method and apparatus of the present invention also has the defencive function of overload, phase shortage.
According to an aspect of the present invention, provide a kind of method of controlling electric machine soft starting, may further comprise the steps: output to motor again after after the starting operating voltage being linked into controllable silicon; Control the angle of flow of described silicon controlled thyristor according to predetermined electric moter voltage ascending curve; By current transformer sampled voltage and current signal; The voltage and current signal of more described sampling and described predetermined voltage and current signal, whether be balance, and according to circumstances send corresponding Trouble Report if detecting current voltage and current signal; Adjust the angle of flow of described thyristor according to the feedback signal of three-phase triggering signal, so that the conducting voltage of described motor tends to described predetermined voltage; Measure the torque of described motor, after described torque reaches nominal torque, described operating voltage is linked into bypass contactor, output to motor again.
Another aspect of the present invention provides a kind of soft method of stopping of motor of controlling, and may further comprise the steps: enter and softly output to motor again after stopping after the process operating voltage is linked into controllable silicon; Control the angle of flow of described silicon controlled thyristor according to predetermined electric moter voltage decline curve; By current transformer sampled voltage and current signal; Relatively three-phase triggers the difference between the voltage and current signal of the voltage and current signal of feedback and described predetermined function; According to the angle of flow of the described described thyristor of discrepancy adjustment that records, so that the voltage of described motor tends to described predetermined voltage; Reduce to zero until the voltage of described motor, soft process of stopping finishes.
Wherein, the torque of described motor approximate with square being directly proportional of stator voltage.During the full conducting of the angle of flow of described silicon controlled thyristor, described motor reaches rated voltage.
According to another aspect of the present invention, a kind of equipment of realizing above-mentioned starting method is provided, this equipment is connected between motor and the motor power, comprising: be connected to the power supply input copper bar interface of three-phase alternating-current supply, also be connected with current transformer on the described interface; Be connected to the output interface of motor; The silicon controlled component of control voltage; Control board, described control board have running status indication interface, faulty indication interface, bypass operating circuit and control signal interface; And bypass A.C. contactor.
Wherein, described control board further comprises: processor, control described control board work and processing signals; The power conversion sync detection device carried out sampled signal before described silicon controlled component, be input to described processor; Current sensing means is connected to described current transformer, and sampling exports the current signal of described motor to from described motor soft starter, and is input to described processor; The trigger impulse generation device is connected to described processor, produces start pulse signal.
After having adopted method and apparatus of the present invention, the voltage when controlling starting by silicon-controlled voltage regulation makes it rise or descend according to comparatively ideal curve.And equipment of the present invention and method are monitored starting or soft situation of stopping in real time by increasing current transformer at input, if the electric voltage exception situation of overload overvoltage or power supply phase shortage, can detect in time, thereby improve the electric motor starting or the fail safe in soft stopping time.
Description of drawings
Feature of the present invention, essence and advantage will be below become more obvious after in conjunction with the accompanying drawings and embodiments the explanation, wherein,
Fig. 1 is the flow chart according to the method for the control electric machine soft starting of one embodiment of the invention;
Fig. 2 is to use an example of the predetermined electric moter voltage curve chart of starting process in the control method of the present invention;
Fig. 3 is the flow chart according to the soft method of stopping of control motor of one embodiment of the invention;
Fig. 4 is to use a soft example that stops the curve chart of the predetermined electric moter voltage of process in the control method of the present invention;
Fig. 5 be according to the equipment of the control electric machine soft starting of one embodiment of the present of invention control principle figure;
Fig. 6 is the control board structure principle chart of the equipment in the foregoing description.
Embodiment
Further specify technical scheme of the present invention below in conjunction with drawings and Examples.
Main design philosophy of the present invention is to use the silicon controlled thyristor that is serially connected with between power supply and the motor to carry out pressure regulation.In the starting process of motor, can make the terminal voltage of motor rise to rated voltage by the angle of flow of regulating thyristor from predefined value, promptly electrical motors is just turn-offed thyristor after nominal torque, puts into bypass contactor then and comes work.In the process that stops, at first cutting off the work electricity of bypass contactor coil, the normally-closed contact when making bypass contactor by operation work disconnects, and also makes motor drop to zero from the load voltage value of normal operation by the angle of flow of regulating thyristor afterwards.Be characterized in that motor torque is similar to and square being directly proportional of voltage.
Shown in Figure 1 is that it comprises following step according to the flow chart of the method for the control electric machine soft starting of one embodiment of the invention:
S11. output to motor again after after the starting operating voltage being linked into controllable silicon.Control the voltage that it exports motor to by control to the angle of flow of thyristor in the controllable silicon.
S12. control the angle of flow of described silicon controlled thyristor according to predetermined electric moter voltage ascending curve.The operating state of motor the best is to make on its mechanical property that is operated in rated voltage, therefore, in the starting process of motor specialized designs best electric moter voltage ascending curve.The angle of flow by the control thyristor can make voltage meet predetermined design voltage as far as possible.Be an example of the predetermined electric moter voltage curve chart of starting process as shown in Figure 2.
S13. by current transformer sampled voltage and current signal.Because in the actual operating process, therefore the curve that actual starting voltage and electric current can not meet design fully must carry out real-time monitoring to the voltage and current of reality.In this embodiment, adopt current transformer to come real-time voltage and current signal is sampled.
S14. whether the voltage and current signal and the described predetermined voltage and current signal of relatively sampling is balance to detect current voltage and current signal, and according to circumstances sends corresponding Trouble Report.After the real-time voltage and current signal in obtaining motor starting process, itself and prearranged signal are compared, if current voltage is higher than design voltage, then should reduce the angle of flow to reduce voltage, if current voltage is lower than design voltage, then needs to increase the angle of flow voltage is raise.
S15. adjust the angle of flow of described thyristor according to the feedback signal of three-phase triggering signal, so that the predetermined voltage of the voltage of motor trend.By constantly monitoring and adjusting, can make the starting voltage of motor meet the ascending curve of design as far as possible.
S16. measure the torque of motor, after torque reaches nominal torque, operating voltage is linked into bypass contactor, output to motor again.After the torque of motor reaches rated value, illustrate that the starting process of motor is finished.Be linked into bypass contactor with operating voltage this moment, can reduce the loss of thyristor, improves the efficient of system.
Stop in the process the soft of motor, take equally to carry out soft method of stopping by thyristor control, the flow chart of the soft method of stopping of control motor according to one embodiment of the invention shown in Figure 3 may further comprise the steps:
S31. enter and softly output to motor again after stopping after the process operating voltage is linked into controllable silicon.Equally control the voltage that it exports motor to by control to the angle of flow of thyristor in the controllable silicon.
S32. control the angle of flow of described silicon controlled thyristor according to predetermined electric moter voltage decline curve.Stop also having designed in the process best electric moter voltage decline curve motor soft.The angle of flow by the control thyristor can make voltage meet predetermined design voltage as far as possible.Be a soft example that stops the predetermined electric moter voltage curve chart of process as shown in Figure 4.
S33. by current transformer sampled voltage and current signal.In this embodiment, also adopt current transformer to come real-time voltage and current signal is sampled.
S34. relatively three-phase triggers the voltage and current signal of feedback and the difference between the described predetermined voltage and current signal.Obtain after the real-time voltage and current signal in the motor starting process, itself and prearranged signal are compared,, then should reduce the angle of flow to reduce voltage if current voltage is higher than design voltage, if current voltage is lower than design voltage, then needs to increase the angle of flow voltage is raise.
S35. according to the angle of flow of the described described thyristor of discrepancy adjustment that records, so that the voltage of described motor tends to described predetermined voltage.By constantly monitoring and adjusting, can make the starting voltage of motor meet the decline curve of design as far as possible.
S36. reduce to zero until the voltage of described motor, soft process of stopping finishes.
In above-mentioned technical scheme, owing to adopt current transformer that the voltage and current of implementing is sampled, can find simultaneously for example to transship, the abnormal conditions of voltage such as phase shortage, the operation that makes motor is safety and stable more.
The present invention also provides a kind of equipment that is used to realize said method simultaneously.Shown in Figure 5 is the control principle figure of this equipment, and this equipment 500 comprises:
Be connected to the power input interface 502 of three-phase alternating current point source, in this embodiment, use three copper busbar R, T and S, connect alternating current L1, L2 and the L3 of three-phase respectively.Also be serially connected with current transformer on this interface, in this embodiment, all be serially connected with a current transformer 512 on described each copper bar.
Be connected to the output interface 504 of motor, in this embodiment, be connected in three output copper bar U, V, W, respectively three-phase electricity is outputed to U1, V1 and the W1 end of motor 600.
The silicon controlled component 506 of control voltage has three groups of silicon controlled components in this embodiment, the phase in each group control AC power.
Control board 508, control board 508 have running status indication interface, faulty indication interface, bypass operating circuit and control signal interface.In this embodiment, running status indication interface and faulty indication interface all are passive interfaces, the state that can indicate operation by the power supply that adds and indicator light and the situation of fault.The control signal interface be used to provide stop in wink, softly stop, soft these three function signals and a common port,
This equipment 500 also comprises bypass contactor 510, is connected with L13 by three copper bar L11, L12.
Wherein.Control board 508 in the above-mentioned equipment 500 further comprises following structure, as shown in Figure 6:
Power conversion sync detection device 602, be connected to three phase mains, this sync detection device 602 obtains current signal by the current transformer 512 on three input copper bars, and power conversion sync detection device 602 is sampled signal before silicon controlled component 612, is input to processor 604.
Current sensing means 608 is connected to motor 600, need utilize three current transformers 512 on the input copper bar to sample equally and export the voltage and current of motor to, and be input to processor 604.
Trigger impulse generation device 610 is connected to processor 604, produces start pulse signal.Processor 604 is controlled the starting process of motor according to the current signal of power conversion sync detection device 602 and current sensing means 608 collections.
In this embodiment, this control board 508 also comprises input/output unit 606.
Open, turn-off controllable silicon by control three-phase trigger pulse signal.And the transistorized angle of flow is controlled by processor, when the three-phase trigger pulse signal is uneven, sort signal is fed back to processor, processor can be adjusted them afterwards, makes the silicon controlled voltage and current signal open, turn-off by default functional relation all the time.
Adopted after the above-mentioned technical scheme, the voltage when method and apparatus of the present invention can be controlled starting by silicon-controlled voltage regulation makes it rise or descend according to comparatively ideal curve.And it can monitor starting or soft situation of stopping in real time by increase current transformer on the input copper bar, if the situation of outlet electric voltage exception can find in time, thereby improve the electric motor starting or the fail safe in soft stopping time.
The foregoing description provides to being familiar with the person in the art and realizes or use of the present invention; those skilled in the art can be under the situation that does not break away from invention thought of the present invention; the foregoing description is made various modifications or variation; thereby protection scope of the present invention do not limit by the foregoing description, and should be the maximum magnitude that meets the inventive features that claims mention.
Claims (6)
1. method of controlling electric machine soft starting may further comprise the steps:
Output to motor again after after the starting operating voltage being linked into controllable silicon;
Control the angle of flow of described silicon controlled thyristor according to predetermined electric moter voltage ascending curve;
By current transformer sampled voltage and current signal;
The voltage and current signal of more described sampling and described predetermined voltage and current signal, whether be balance, and according to circumstances send corresponding Trouble Report if detecting current voltage and current signal;
Adjust the angle of flow of described thyristor according to the feedback signal of three-phase triggering signal, so that the voltage of described motor tends to described predetermined voltage;
Measure the torque of described motor, after described torque reaches nominal torque, described operating voltage is linked into bypass contactor, output to motor again.
2. control the soft method of stopping of motor for one kind, may further comprise the steps:
Enter and softly output to motor again after stopping after the process operating voltage is linked into controllable silicon;
Control the angle of flow of described silicon controlled thyristor according to predetermined electric moter voltage decline curve;
By current transformer sampled voltage and current signal;
Relatively three-phase trigger feedback the voltage and current signal and the difference between the described predetermined function voltage and current signal;
According to the angle of flow of the described described thyristor of discrepancy adjustment that records, so that the voltage of described motor tends to described predetermined voltage;
Reduce to zero until the voltage of described motor, soft process of stopping finishes.
3. method as claimed in claim 1 or 2 is characterized in that, the torque of described motor approximate with square being directly proportional of stator voltage.
4. method as claimed in claim 1 or 2 is characterized in that, during the full conducting of the angle of flow of described silicon controlled thyristor, described motor reaches rated voltage.
5. the equipment that can realize method as claimed in claim 1 or 2 is connected between motor and the motor power, comprising:
Be connected to the power supply input copper bar interface of three-phase alternating-current supply, also be connected with current transformer on the described interface;
Be connected to the output interface of motor;
The silicon controlled component of control voltage;
Control board, described control board have running status indication interface, faulty indication interface, bypass operating circuit and control signal interface; And
The bypass A.C. contactor.
6. equipment as claimed in claim 5 is characterized in that, described control board further comprises:
Processor is controlled described control board work and processing signals;
The power conversion sync detection device carried out sampled signal before described silicon controlled component, be input to described processor;
Current sensing means is connected to described current transformer, and sampling exports the current signal of described motor to from described motor soft starter, and is input to described processor;
The trigger impulse generation device is connected to described processor, produces start pulse signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100528983A CN1722603A (en) | 2004-07-16 | 2004-07-16 | Method and apparatus for controlling electrical machinery soft-start and soft-stop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100528983A CN1722603A (en) | 2004-07-16 | 2004-07-16 | Method and apparatus for controlling electrical machinery soft-start and soft-stop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1722603A true CN1722603A (en) | 2006-01-18 |
Family
ID=35912618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100528983A Pending CN1722603A (en) | 2004-07-16 | 2004-07-16 | Method and apparatus for controlling electrical machinery soft-start and soft-stop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1722603A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101572522B (en) * | 2009-03-02 | 2011-10-19 | 卞光辉 | Fool type self-learning motor soft on-off control device |
| CN102291061A (en) * | 2011-08-25 | 2011-12-21 | 安徽鑫龙电器股份有限公司 | Braking method of soft starter |
| CN102655385A (en) * | 2012-01-05 | 2012-09-05 | 三一重型装备有限公司 | Soft starter of three-phase asynchronous motor and control method of soft starter |
| CN101789748B (en) * | 2009-01-19 | 2013-10-23 | 日立工机株式会社 | Electric tool |
| CN108204696A (en) * | 2017-11-28 | 2018-06-26 | 珠海格力电器股份有限公司 | The control method of compressor, device and system, storage medium, processor |
| CN111865145A (en) * | 2019-04-26 | 2020-10-30 | 南京德朔实业有限公司 | Electric tool and control method thereof |
| CN115441772A (en) * | 2022-11-07 | 2022-12-06 | 希望森兰科技股份有限公司 | Triggering angle control method for soft starter of asynchronous motor |
-
2004
- 2004-07-16 CN CNA2004100528983A patent/CN1722603A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789748B (en) * | 2009-01-19 | 2013-10-23 | 日立工机株式会社 | Electric tool |
| US8686675B2 (en) | 2009-01-19 | 2014-04-01 | Hitachi Koki Co., Ltd. | Power tool |
| CN101572522B (en) * | 2009-03-02 | 2011-10-19 | 卞光辉 | Fool type self-learning motor soft on-off control device |
| CN102291061A (en) * | 2011-08-25 | 2011-12-21 | 安徽鑫龙电器股份有限公司 | Braking method of soft starter |
| CN102291061B (en) * | 2011-08-25 | 2013-10-30 | 安徽鑫龙电器股份有限公司 | Braking method of soft starter |
| CN102655385A (en) * | 2012-01-05 | 2012-09-05 | 三一重型装备有限公司 | Soft starter of three-phase asynchronous motor and control method of soft starter |
| CN102655385B (en) * | 2012-01-05 | 2015-09-02 | 三一重型装备有限公司 | Threephase asynchronous machine soft starter and control method thereof |
| CN108204696A (en) * | 2017-11-28 | 2018-06-26 | 珠海格力电器股份有限公司 | The control method of compressor, device and system, storage medium, processor |
| CN111865145A (en) * | 2019-04-26 | 2020-10-30 | 南京德朔实业有限公司 | Electric tool and control method thereof |
| CN115441772A (en) * | 2022-11-07 | 2022-12-06 | 希望森兰科技股份有限公司 | Triggering angle control method for soft starter of asynchronous motor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1047892C (en) | Procedure and apparatus for braking a synchronous motor | |
| CN1054858A (en) | Arrangement for connecting system | |
| CA2714239C (en) | Softstarter device and method to control the softstarting of an electric motor | |
| CN100411296C (en) | Instantaneous power cut restaring method and apparatus for frequency change speed regulating system | |
| CN1586033A (en) | Electric motor drive | |
| CN101055983A (en) | Hardware overvoltage breaking-off circuit | |
| CN1617434A (en) | Ground fault detection system and method for inverter | |
| CN1822462A (en) | A method and an apparatus for supervising the operation of current transformers | |
| CN1722603A (en) | Method and apparatus for controlling electrical machinery soft-start and soft-stop | |
| CN2831607Y (en) | Driving controller for brushless dynamo | |
| CN105035960A (en) | Cable crane hoisting mechanism control circuit system with inversion protection function | |
| CN1351401A (en) | Electric power system | |
| CN2768306Y (en) | Motor soft starter using silicon controlled ACVV | |
| CN1190002C (en) | Frequency control method for frequency changer for pumping unit | |
| CN1878685A (en) | Electric vehicle controller | |
| CN1554992A (en) | Automatic voltage stabilizing regulation power source with variable far end load | |
| CN1920588A (en) | Device for failure analysis of surge protector lightning protection component | |
| CN1685601A (en) | System and method for automatic current limit control | |
| CN204190663U (en) | A kind of coiling electric motor speed regulating device | |
| CN108011357B (en) | A kind of thyristor groups string protective device and method | |
| CN201118522Y (en) | Intelligent controller | |
| CN2697060Y (en) | Frequency conversion electric controller for bridge crane | |
| CN102946087A (en) | Low voltage frequency converter provided with overvoltage protection function and overvoltage protection method of low voltage frequency converter | |
| CN101075796A (en) | Flexible starter for electric motor | |
| CN2515869Y (en) | Intelligent FM adjustable speed drive device for hoister |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |