CN202957776U - Soft starter of squirrel cage motor - Google Patents
Soft starter of squirrel cage motor Download PDFInfo
- Publication number
- CN202957776U CN202957776U CN 201220616930 CN201220616930U CN202957776U CN 202957776 U CN202957776 U CN 202957776U CN 201220616930 CN201220616930 CN 201220616930 CN 201220616930 U CN201220616930 U CN 201220616930U CN 202957776 U CN202957776 U CN 202957776U
- Authority
- CN
- China
- Prior art keywords
- circuit
- switch
- cage motor
- squirrel cage
- squirrel
- 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.)
- Expired - Fee Related
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Abstract
The utility model discloses a soft starter of a squirrel cage motor. The soft starter of the squirrel cage motor comprises a squirrel cage motor, a working switch KM1 is connected with a circuit between the squirrel cage motor and a three-phase power supply in series, a capacitor protection switch DK2 is connected with a circuit between an input phase start working capacitor C and the working switch KM1 in series, both ends of a series circuit of a wire inlet starting switch KM2 and a voltage reduction transformer are respectively connected with a circuit between the working switch and the three-phase power supply and a sealing point, and a sealing point switch KM3 is connected with a circuit between the transformer and the sealing point in series. Compared with the prior art, the soft starter of the squirrel cage motor has significant advantages of little startup current, little impact on a power grid and smooth start when the power grid is weak.
Description
Technical field:
The utility model 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 3.5-5 times of left and right.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 more difficult when relatively poor for electrical network.
Summary of the invention:
It is low that the purpose of this utility model is to provide a kind of starting current, and start effective a kind of squirrel-cage motor soft initiator.
The technical scheme that realizes the utility model purpose 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 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 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 circuit between transformer and seal point.
The utility model has compared with the prior art that starting current is little impacts little and remarkable advantage 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 utility model.
Embodiment:
The utility model is described in further detail in conjunction with above-mentioned accompanying drawing.Be connected in series successively power protection switch DK1 and operating switch on the circuit between three phase mains and squirrel-cage motor; one end of step-down transformer TDE coil and above-mentioned DK1 are connected with circuit between 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 above-mentioned operating switch KM1; on the circuit that terminates between operating switch KM1 and 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 utility model 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 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 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 circuit between transformer and seal point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220616930 CN202957776U (en) | 2012-11-21 | 2012-11-21 | Soft starter of squirrel cage motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220616930 CN202957776U (en) | 2012-11-21 | 2012-11-21 | Soft starter of squirrel cage motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202957776U true CN202957776U (en) | 2013-05-29 |
Family
ID=48463326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220616930 Expired - Fee Related CN202957776U (en) | 2012-11-21 | 2012-11-21 | Soft starter of squirrel cage motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202957776U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931886A (en) * | 2012-11-21 | 2013-02-13 | 新乡市豫新电器有限公司 | Soft starter for squirrel cage motor |
-
2012
- 2012-11-21 CN CN 201220616930 patent/CN202957776U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931886A (en) * | 2012-11-21 | 2013-02-13 | 新乡市豫新电器有限公司 | Soft starter for squirrel cage motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130529 Termination date: 20131121 |