CN104967362B - A kind of control circuit for electric machine step-down starting - Google Patents
A kind of control circuit for electric machine step-down starting Download PDFInfo
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- CN104967362B CN104967362B CN201510416086.0A CN201510416086A CN104967362B CN 104967362 B CN104967362 B CN 104967362B CN 201510416086 A CN201510416086 A CN 201510416086A CN 104967362 B CN104967362 B CN 104967362B
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Abstract
The present invention provides a kind of control circuits for electric machine step-down starting, belong to technical field of motors.The control circuit scope of application that it solves existing electric machine step-down starting is low, motor switches the technical problems such as instantaneous loss of pressure in voltage.This control circuit includes electric motor starting contactor KM1, transformer, relay KA1, relay KA2, relay KA3, relay KA4, relay KA5, relay KA6 and motor M.The present invention utilizes electromagnetic induction principle, traditional transformer switching tap pressure regulation is combined with compensation pressure regulation, by the turn ratio for changing the primary and secondary coil of transformer, adjust offset voltage, to adjust output voltage, achieve the purpose that reduced-voltage starting, and eliminates motor the problem of voltage switches instantaneous loss of pressure.
Description
Technical field
The invention belongs to technical field of motors, are related to a kind of control circuit for electric machine step-down starting.
Background technology
Electric motor starting electric current approximation is directly proportional to the voltage of stator, therefore to be limited using the method for reducing stator voltage
Starting current, as reduced-voltage starting；Reduced-voltage starting is more common in middle low power motor, and reduced-voltage starting method common at present has star three
Angle starts and auto-transformer reduced-voltage starting, the former can be used for frequent starting but detent torque is low, not applicable and heavy load starting, after
Person detent torque is high, can heavy load starting but can not frequent starting；Meanwhile the torque shock ends both deposited on startup are larger, electricity
Crush-cutting changes the shortcomings that moment motor decompression.
Therefore, those skilled in the art be dedicated to exploitation it is a kind of it is applied widely, eliminate motor and switch wink in voltage
Between decompression problem control circuit.
Invention content
The present invention existing above problem in view of the prior art, it is electric to provide a kind of control for electric machine step-down starting
Road, the technical problem to be solved by the present invention is to：How motor is eliminated the problem of voltage switches instantaneous loss of pressure.
Object of the invention can be realized by the following technical scheme：
A kind of control circuit for electric machine step-down starting, which is characterized in that the control circuit includes that electric motor starting connects
Tentaculum KM1, transformer, relay KA1, relay KA2, relay KA3, relay KA4, relay KA5, relay KA6 and
Motor M, the electric motor starting contactor KM1 are electrically connected with three phase mains and transformer respectively, and the transformer includes secondary
Coil N1, primary coil N2 and primary coil N3；One end of the relay KA1 is electrically connected with the three phase mains, it is described after
The other end of electric appliance KA1 is electrically connected with the upper end of the primary coil N2；One end of the relay KA2 and the three phase mains
The other end of electrical connection, the relay KA2 is electric with the lower end of the primary coil N2 and one end of the relay KA4 respectively
Connection；One end of the relay KA3 is electrically connected with the three phase mains, the other end and the relay of the relay KA3
One end of device KA4 is electrically connected；The other end of the relay KA4 is electrically connected with the upper end of the primary coil N3；The relay
One end of device KA5 and relay KA6 parallel connections and the relay KA5 are electrically connected with the three phase mains, the relay
The other end of KA5 is electrically connected with the lower end of the primary coil N3；The upper end of the secondary coil N1 connects with the electric motor starting
Tentaculum KM1 electrical connections, the lower end of the secondary coil N1 is electrically connected with the motor M.
In a kind of above-mentioned control circuit for electric machine step-down starting, the secondary coil N1 includes the first secondary wire
Circle, second subprime coil and third secondary coil, the primary coil N2 include the first primary coil, the second primary coil and the
Three primary coils, the primary coil N3 include the 4th primary coil, the 5th primary coil and the 6th primary coil, described first
Secondary coil, the first primary coil and the 4th primary coil constitute a transformation circuit, the second subprime coil, the second primary
Coil and the 5th primary coil constitute a transformation circuit, the primary line of the third secondary coil, third primary coil and the 6th
Circle constitutes a transformation circuit.
In a kind of above-mentioned control circuit for electric machine step-down starting, first secondary coil and three phase mains
C is electrically connected, and the B of the second subprime coil and three phase mains is electrically connected, the A of the third secondary coil and three phase mains
It is electrically connected.
In a kind of above-mentioned control circuit for electric machine step-down starting, first primary coil and three phase mains
C is electrically connected, and the B of second primary coil and three phase mains is electrically connected, the A of the third primary coil and three phase mains
It is electrically connected.
In a kind of above-mentioned control circuit for electric machine step-down starting, the 4th primary coil and three phase mains
C is electrically connected, and the B of the 5th primary coil and three phase mains is electrically connected, the A of the 6th primary coil and three phase mains
It is electrically connected.
The method have the benefit that：Using electromagnetic induction principle, by traditional transformer switching tap pressure regulation and benefit
The formula pressure regulation of repaying is combined, and by changing the turn ratio of the primary and secondary coil of transformer, offset voltage is adjusted, to adjust output electricity
Pressure, achievees the purpose that reduced-voltage starting, and eliminates motor the problem of voltage switches instantaneous loss of pressure.
The technique effect of the design of the present invention, concrete structure and generation is described further below with reference to attached drawing, with
It is fully understood from the purpose of the present invention, feature and effect.
Description of the drawings
Fig. 1 is a kind of circuit diagram of control circuit for electric machine step-down starting provided by the present invention.
As shown in the figure：The first secondary coils of 11-, 12- second subprime coils, 13- third secondary coils, 21- first are primary
Coil, the second primary coils of 22-, 23- third primary coils, the 4th primary coils of 31-, the 5th primary coils of 32-, 33- the 6th
Primary coil.
Specific implementation mode
For it is relatively intuitive, be fully understood by technical scheme of the present invention, now just combine the embodiment of the present invention and its attached drawing into
The unrestricted feature description of row is as follows：
As shown in Figure 1, this control circuit include electric motor starting contactor KM1, transformer, relay KA1, relay KA2,
Relay KA3, relay KA4, relay KA5, relay KA6 and motor M, wherein motor M are three phase alternating current motor, electricity
Machine starting contactor KM1 is electrically connected with three phase mains and transformer respectively, transformer include secondary coil N1, primary coil N2 and
Primary coil N3.
As shown in Figure 1, one end of relay KA1 is electrically connected with three phase mains, the other end and primary coil of relay KA1
The upper end of N2 is electrically connected；One end of relay KA2 is electrically connected with three phase mains, the other end of relay KA2 respectively with primary line
Enclose the lower end of N2 and one end electrical connection of relay KA4；One end of relay KA3 is electrically connected with three phase mains, relay KA3's
The other end is electrically connected with one end of relay KA4；The other end of relay KA4 is electrically connected with the upper end of primary coil N3；Relay
Device KA5 and one end of relay KA6 parallel connections and relay KA5 are electrically connected with three phase mains, the other end and the primary of relay KA5
The lower end of coil N3 is electrically connected；The upper end of secondary coil N1 is electrically connected with electric motor starting contactor KM1, the lower end of secondary coil N1
It is electrically connected with motor M.
Further, secondary coil N1 includes the first secondary coil 11, second subprime coil 12 and third secondary coil 13,
Primary coil N2 includes the first primary coil 21, the second primary coil 22 and third primary coil 23, and primary coil N3 includes the
Four primary coils 31, the 5th primary coil 32 and the 6th primary coil 33, the first secondary coil 11, the first primary coil 21 and
Four primary coils 31 constitute a transformation circuit, second subprime coil 12, the second primary coil 22 and 32 structure of the 5th primary coil
At a transformation circuit, third secondary coil 13, third primary coil 23 and the 6th primary coil 33 constitute a transformation circuit.
Further, the C of the first secondary coil 11 and three phase mains is electrically connected, second subprime coil 12 and three phase mains
B be electrically connected, third secondary coil 13 and the A of three phase mains are electrically connected.
Further, the C of the first primary coil 21 and three phase mains is electrically connected, the second primary coil 22 and three phase mains
B be electrically connected, third primary coil 23 and the A of three phase mains are electrically connected.
Further, the C of the 4th primary coil 31 and three phase mains is electrically connected, the 5th primary coil 32 and three phase mains
B be electrically connected, the A of the 6th primary coil 33 and three phase mains is electrically connected.
This control circuit utilizes electromagnetic induction principle, and traditional transformer switching tap pressure regulation is mutually tied with compensation pressure regulation
It closes, by changing the turn ratio of the primary and secondary coil of transformer, adjusts offset voltage and reach decompression to adjust output voltage and open
Dynamic purpose；This control circuit eliminates motor and switches wink in voltage on the advantages of having taken into account existing reduced-voltage starting method
Between decompression the problem of, meanwhile, started by the way of boosting step by step, reduce torque shock ends when startup, be conducive to motor
Reliability service.The present invention is not influenced by frequent starting and loading condition, in identical load, circuit institute used in the present invention
Need space smaller, operation more reliable.
The course of work of this control circuit is as follows：When relay KA1, relay KA2 closures, when other relays disconnect,
System output minimum voltage, if relay KM1 is closed at this time, motor M is started with minimum voltage；After a period of time, relay
Device KA1, relay KA4, relay KA5 are closed, other relays disconnect, then system output voltage increases one grade, and motor M turns
Square increases, also can just closing relay KM1 at this moment, then motor started with higher torque；Relay after continuation a period of time
KA1, relay KA4, relay KA6 are closed, other relays disconnect, and motor is run with 380V normal pressures at this time, start-up course
Terminate.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be in the protection domain being defined in the patent claims.
Claims (4)
1. a kind of control circuit for electric machine step-down starting, which is characterized in that the control circuit includes electric motor starting contact
Device KM1, transformer, relay KA1, relay KA2, relay KA3, relay KA4, relay KA5, relay KA6 and electricity
Motivation M, the electric motor starting contactor KM1 are electrically connected with three phase mains and transformer respectively, and the transformer includes secondary wire
Enclose N1, primary coil N2 and primary coil N3；One end of the relay KA1 is electrically connected with the three phase mains, the relay
The other end of device KA1 is electrically connected with the upper end of the primary coil N2；One end of the relay KA2 and three phase mains electricity
Connection, the one end of the other end of the relay KA2 respectively with the lower end of the primary coil N2 and the relay KA4 are electrically connected
It connects；One end of the relay KA3 is electrically connected with the three phase mains, the other end and the relay of the relay KA3
One end of KA4 is electrically connected；The other end of the relay KA4 is electrically connected with the upper end of the primary coil N3；The relay
One end of KA5 and relay KA6 parallel connections and the relay KA5 are electrically connected with the three phase mains, the relay KA5
The other end be electrically connected with the lower end of the primary coil N3；The upper end of the secondary coil N1 and the electric motor starting contactor
KM1 is electrically connected, and the lower end of the secondary coil N1 is electrically connected with the motor M；
The secondary coil N1 includes the first secondary coil, second subprime coil and third secondary coil, the primary coil N2
Including the first primary coil, the second primary coil and third primary coil, the primary coil N3 includes the 4th primary coil, the
Five primary coils and the 6th primary coil, first secondary coil, the first primary coil and the 4th primary coil constitute one
Transformation circuit, the second subprime coil, the second primary coil and the 5th primary coil constitute a transformation circuit, the third
Secondary coil, third primary coil and the 6th primary coil constitute a transformation circuit.
2. a kind of control circuit for electric machine step-down starting according to claim 1, which is characterized in that the first time
The C of grade coil and three phase mains is electrically connected, and the B of the second subprime coil and three phase mains is electrically connected, the third time
The A of grade coil and three phase mains is electrically connected.
3. a kind of control circuit for electric machine step-down starting according to claim 1 or 2, which is characterized in that described
The C of one primary coil and three phase mains is electrically connected, and the B of second primary coil and three phase mains is electrically connected, and described
The A of three primary coils and three phase mains is electrically connected.
4. a kind of control circuit for electric machine step-down starting according to claim 1 or 2, which is characterized in that described
The C of four primary coils and three phase mains is electrically connected, and the B of the 5th primary coil and three phase mains is electrically connected, and described
The A of six primary coils and three phase mains is electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510416086.0A CN104967362B (en) | 2015-07-03 | 2015-07-03 | A kind of control circuit for electric machine step-down starting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510416086.0A CN104967362B (en) | 2015-07-03 | 2015-07-03 | A kind of control circuit for electric machine step-down starting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104967362A CN104967362A (en) | 2015-10-07 |
| CN104967362B true CN104967362B (en) | 2018-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510416086.0A Active CN104967362B (en) | 2015-07-03 | 2015-07-03 | A kind of control circuit for electric machine step-down starting |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4978903A (en) * | 1988-07-19 | 1990-12-18 | A-Teollisuus Oy | Apparatus for the control of a three-phase a.c. motor, especially a squirrel-cage motor |
| CN1764056A (en) * | 2004-10-19 | 2006-04-26 | 湖北追日电气设备有限公司 | High-voltage motor reduction voltage soft-start device |
| CN202870662U (en) * | 2012-04-17 | 2013-04-10 | 北京金惠昌生物安全技术有限公司 | High-power control system for automatic regulation of current |
| CN103259416A (en) * | 2012-02-21 | 2013-08-21 | 陈守君 | Magnetic voltage regulation power supply and power saving method thereof |
| CN203225690U (en) * | 2012-12-25 | 2013-10-02 | 湖南科太电气有限公司 | Large power high voltage motor voltage reduction voltage regulation combination soft starting device |
| CN203910500U (en) * | 2014-05-27 | 2014-10-29 | 江苏省电力公司南京供电公司 | Multistage on-load voltage regulation icing preventing transformer |
| CN104247251A (en) * | 2012-04-10 | 2014-12-24 | 赖茵豪森机械制造公司 | Control transformer |
| CN204810181U (en) * | 2015-07-03 | 2015-11-25 | 宁波绿凯节能科技有限公司 | A control circuit for motor reduced -voltage starting |
-
2015
- 2015-07-03 CN CN201510416086.0A patent/CN104967362B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4978903A (en) * | 1988-07-19 | 1990-12-18 | A-Teollisuus Oy | Apparatus for the control of a three-phase a.c. motor, especially a squirrel-cage motor |
| CN1764056A (en) * | 2004-10-19 | 2006-04-26 | 湖北追日电气设备有限公司 | High-voltage motor reduction voltage soft-start device |
| CN103259416A (en) * | 2012-02-21 | 2013-08-21 | 陈守君 | Magnetic voltage regulation power supply and power saving method thereof |
| CN104247251A (en) * | 2012-04-10 | 2014-12-24 | 赖茵豪森机械制造公司 | Control transformer |
| CN202870662U (en) * | 2012-04-17 | 2013-04-10 | 北京金惠昌生物安全技术有限公司 | High-power control system for automatic regulation of current |
| CN203225690U (en) * | 2012-12-25 | 2013-10-02 | 湖南科太电气有限公司 | Large power high voltage motor voltage reduction voltage regulation combination soft starting device |
| CN203910500U (en) * | 2014-05-27 | 2014-10-29 | 江苏省电力公司南京供电公司 | Multistage on-load voltage regulation icing preventing transformer |
| CN204810181U (en) * | 2015-07-03 | 2015-11-25 | 宁波绿凯节能科技有限公司 | A control circuit for motor reduced -voltage starting |
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| CN104967362A (en) | 2015-10-07 |
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