CN102931886A - Soft starter for squirrel cage motor - Google Patents
Soft starter for squirrel cage motor Download PDFInfo
- Publication number
- CN102931886A CN102931886A CN2012104725453A CN201210472545A CN102931886A CN 102931886 A CN102931886 A CN 102931886A CN 2012104725453 A CN2012104725453 A CN 2012104725453A CN 201210472545 A CN201210472545 A CN 201210472545A CN 102931886 A CN102931886 A CN 102931886A
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- China
- Prior art keywords
- circuit
- switch
- cage motor
- squirrel cage
- squirrel
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Abstract
The invention discloses a soft starter for a squirrel cage motor, which comprises a squirrel cage motor, wherein an operating switch KM1 is in series connected on a circuit between the squirrel cage motor and a three-phase power supply, a capacitor protection switch DK2 is in series connected on a circuit between a leading phase starting operation capacitor C, the operating switch KM1 and the motor, two ends of a series circuit for a starting incoming line switch KM2 and a step-down transformer are connected with a circuit between the operating switch KM1 and the three-phase power supply, and a seal point respectively, and a seal point switch KM3 is in series connected on a circuit between the step-down transformer and the seal point. Compared with the prior art, the soft starter for the squirrel cage motor has the significant advantages of small starting current and small impact to the power network, and also can be started successfully when the power network is poorer.
Description
Technical field:
The present invention relates to a kind of starter, particularly a kind of squirrel-cage motor soft initiator.
Background technology:
Squirrel-cage motor is little because of staring torque, need consume larger electric current during startup and just can make electric motor starting, generally reduces starting current about 3.5-5 times.Relatively poor or load when heavier when power grid quality, because the large voltage attenuation of starting current is obvious, cause electric motor starting not.The soft initiator of applying in the market, to adopt ramp voltage and current-limiting method to solve starting current to impact, and the electric motor starting power factor is not obviously improved, though starting current has to descend and is difficult to be down to below 3.5 times, start still relatively difficulty when relatively poor for electrical network.
Summary of the invention:
The purpose of this invention is to provide a kind of starting current low, and start effective a kind of squirrel-cage motor soft initiator.
The technical scheme that realizes the object of the invention is; a kind of squirrel-cage motor soft initiator; comprise squirrel-cage motor; it is characterized in that: be serially connected with operating switch KM1 on the circuit between squirrel-cage motor and the three phase mains; electric capacity protection switch DK2 is serially connected on the circuit that starts mutually between mutual capacitance C and above-mentioned operating switch KM1 and the motor; start service entrance switch KM2 and step-down transformer series circuit two ends respectively with operating switch and three phase mains between circuit and seal point be connected, seal point K switch M3 is serially connected on the circuit between transformer and the seal point.
The present invention has compared with the prior art that starting current is little to impact remarkable advantage little and that also can start smoothly to electrical network when electrical network is relatively poor.
Description of drawings:
Fig. 1 is electric principle schematic of the present invention.
Embodiment:
The invention will be further described in conjunction with above-mentioned accompanying drawing.On the circuit between three phase mains and the squirrel-cage motor, be connected in series successively power protection switch DK1 and operating switch; one end of step-down transformer TDE coil and above-mentioned DK1 are connected with circuit between the KM1; starting switch KM2 is connected in series on this circuit; the other end of this TDE coil is connected with seal point K switch M3; the other end of this step-down transformer adjustment contact is connected with the circuit between squirrel-cage motor and the above-mentioned operating switch KM1; on the circuit that terminates between operating switch KM1 and the squirrel-cage motor of electric capacity protection switch DK2, its other end with advance to start mutually working capacitor C and be connected.
Method of operation of the present invention is, when starting squirrel-cage motor, simultaneously DK1, KM2, KM3 and DK2 switch are closed, advance phase electric capacity and drop into startup work, squirrel-cage motor begins to rotate, by accelerating gradually slowly, when reaching rated speed, the operating switch KM1 that closes, and disconnect above-mentioned KM3, KM2, excision TDE step-down transformer, squirrel-cage motor enters normal operation.
Claims (1)
1. squirrel-cage motor soft initiator; comprise squirrel-cage motor; it is characterized in that: be serially connected with operating switch KM1 on the circuit between squirrel-cage motor and the three phase mains; electric capacity protection switch DK2 is serially connected on the circuit that starts mutually between mutual capacitance C and above-mentioned operating switch KM1 and the motor; start service entrance switch KM2 and step-down transformer series circuit two ends respectively with operating switch and three phase mains between circuit and seal point be connected, seal point K switch M3 is serially connected on the circuit between transformer and the seal point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104725453A CN102931886A (en) | 2012-11-21 | 2012-11-21 | Soft starter for squirrel cage motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104725453A CN102931886A (en) | 2012-11-21 | 2012-11-21 | Soft starter for squirrel cage motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102931886A true CN102931886A (en) | 2013-02-13 |
Family
ID=47646618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104725453A Pending CN102931886A (en) | 2012-11-21 | 2012-11-21 | Soft starter for squirrel cage motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102931886A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103501134A (en) * | 2013-10-11 | 2014-01-08 | 昆山市润苏物资有限公司 | Soft starter for squirrel-cage motor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85200162U (en) * | 1985-04-01 | 1985-11-10 | 柳金林 | Motor starting for decreasing reactive-current |
| CN200956559Y (en) * | 2006-09-06 | 2007-10-03 | 襄樊大力工业控制股份有限公司 | Large-sized motor reactive power balance steping-down start device |
| CN201789459U (en) * | 2010-07-23 | 2011-04-06 | 大禹电气科技股份有限公司 | Large high-voltage motor capacitance energy-storage compensating starter |
| CN202285382U (en) * | 2011-10-28 | 2012-06-27 | 武汉理工大学 | Self-coupling magnetic control reactance soft-starting device for super-power high-voltage motor |
| CN202957776U (en) * | 2012-11-21 | 2013-05-29 | 新乡市豫新电器有限公司 | Soft starter of squirrel cage motor |
-
2012
- 2012-11-21 CN CN2012104725453A patent/CN102931886A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85200162U (en) * | 1985-04-01 | 1985-11-10 | 柳金林 | Motor starting for decreasing reactive-current |
| CN200956559Y (en) * | 2006-09-06 | 2007-10-03 | 襄樊大力工业控制股份有限公司 | Large-sized motor reactive power balance steping-down start device |
| CN201789459U (en) * | 2010-07-23 | 2011-04-06 | 大禹电气科技股份有限公司 | Large high-voltage motor capacitance energy-storage compensating starter |
| CN202285382U (en) * | 2011-10-28 | 2012-06-27 | 武汉理工大学 | Self-coupling magnetic control reactance soft-starting device for super-power high-voltage motor |
| CN202957776U (en) * | 2012-11-21 | 2013-05-29 | 新乡市豫新电器有限公司 | Soft starter of squirrel cage motor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103501134A (en) * | 2013-10-11 | 2014-01-08 | 昆山市润苏物资有限公司 | Soft starter for squirrel-cage motor |
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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 |
Application publication date: 20130213 |