CN202059356U - Motor frequency conversion soft starter - Google Patents
Motor frequency conversion soft starter Download PDFInfo
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- CN202059356U CN202059356U CN2011201791115U CN201120179111U CN202059356U CN 202059356 U CN202059356 U CN 202059356U CN 2011201791115 U CN2011201791115 U CN 2011201791115U CN 201120179111 U CN201120179111 U CN 201120179111U CN 202059356 U CN202059356 U CN 202059356U
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Abstract
The present utility model discloses a motor frequency conversion soft starter. The input of a bypass contactor and the input of an air switch are respectively connected with a power supply, the output of the air switch is connected with the input of a first three-phase reactor, the output of the first three-phase reactor is connected with the input of a diode rectifier bridge, the output of the diode rectifier bridge is connected with the input of a filter capacitor, the output of the filter capacitor is connected with the input of a direct current chopper control circuit, the output of the direct current chopper control circuit is connected with the input of a direct current smoothing reactor, the output of the direct current smoothing reactor is connected with the input of an inverter, the output of the inverter is connected with the input of a second three-phase reactor, the output of the second three-phase reactor is connected with the input of a starting contactor, and the output of the starting contactor and the output of the bypass contactor are respectively connected with the input of the motor. By adopting the new soft starter, the problem of the prior motor soft starter that the current is lowered and the motor starting moment is reduced per square during the starting process of the motor is solved.
Description
Technical field
The utility model relates to a kind of motor starter, particularly a kind of motor frequency change soft initiator.
Background technology
380V low voltage motor rated current approximately is 1.8 times of motor rated power, and for example 200KW motor rated current is 360A.The direct starting current of motor approximately is 6-7 a times of motor rated current, and for example the direct starting current 2160A～2520A of 200KW motor is reactive current substantially.Because the electric motor starting electric current is to producing huge reactive power impact and make net force down for distribution, so the above motor of 40KW all is equipped with soft initiator, and the effect of traditional soft initiator is exactly to reduce the electric motor starting electric current by the reduction supply power voltage.
Motor start-up moment and starting current square are directly proportional, and are inversely proportional to frequency of supply.Under the constant condition of frequency of supply, starting current drops to 50% of direct starting current, and staring torque drops to 25% of direct staring torque.Therefore, the general electric current of traditional soft initiator only drops to 50% (for example 200KW motor tradition starting current 1080A～1260A), and load that motor is with is (the traditional soft starter also is the underloading soft start thus) too greatly.
The utility model content
At the deficiencies in the prior art, the purpose of this utility model be to provide a kind of can solve that traditional Electric Motor Soft-starter electric current in the motor start-up process reduces and motor start-up moment by the motor frequency change soft initiator of the contradiction of square reduction.
The technical solution of the utility model is achieved in that the motor frequency change soft initiator, the electric current input of bypass contactor and the electric current input of air switch are connected with power supply respectively, the electric current output of air switch is connected with the electric current input of first three-phase reactor, the electric current output of first three-phase reactor is connected with the electric current input of diode rectifier bridge, the electric current output of diode rectifier bridge is connected with the electric current input of filtering capacitor, the electric current output of filtering capacitor is connected with the electric current input of DC chopped-wave voltage-regulating circuit, the electric current output of DC chopped-wave voltage-regulating circuit is connected with the electric current input of dc flat-wave reactor, the electric current output of dc flat-wave reactor is connected with the electric current input of inverter, the electric current output of inverter is connected with the electric current input of second three-phase reactor, the electric current output of second three-phase reactor is connected with the electric current input of starting contactor, and the electric current output of starting contactor and the electric current output of bypass contactor are connected with the electric current input of motor respectively.
Above-mentioned motor frequency change soft initiator is in series with fast acting fuse between first three-phase reactor and the diode rectifier bridge.
The beneficial effects of the utility model are: the utility model motor frequency change soft initiator solved that electric current reduces and staring torque by the contradiction of square reduction, employing motor frequency of supply rises to the variable frequency starting mode of 50HZ gradually from 1HZ.Compare with traditional soft starting mode, the motor start-up electric current is at 6 times (for example 200KW motor frequency conversion starting current 210A) that descend.Be reduced to 1/36 problem in order to solve staring torque, frequency reduces by 50 times, and staring torque improves 1.3 times on the contrary.On the other hand, power factor is lower during the motor light-load starting, is 1 technology if adopt power factor, and the grid side supply current is also lower than electric motor starting electric current, is 0.38 of motor rated current, for example mains supply electric current 137A during the 200KW electric motor starting.Therefore, it is below 1/11 of traditional soft starter mains supply electric current that the utility model motor frequency change soft initiator starts the mains supply electric current, and the motor start-up electric current is reduced to below 1/6.The grid side power factor rises to 1 from 0.1.Realized " soft start " truly.
Description of drawings
Fig. 1 is the Circuits System schematic diagram of motor frequency change soft initiator of the present utility model.
Among the figure: 1-motor, 2-DC chopped-wave voltage-regulating circuit.
Embodiment
In conjunction with the accompanying drawings the utility model is described further:
As shown in Figure 1, the motor frequency change soft initiator of present embodiment, the electric current input of bypass contactor and the electric current input of air switch are connected with power supply respectively, the electric current output of air switch K1 is connected with the electric current input of the first three-phase reactor L1, the electric current output of the first three-phase reactor L1 is connected with the electric current input of diode rectifier bridge, the electric current output of diode rectifier bridge is connected with the electric current input of filtering capacitor, the electric current output of filtering capacitor is connected with the electric current input of DC chopped-wave voltage-regulating circuit 2, the electric current output of DC chopped-wave voltage-regulating circuit 2 is connected with the electric current input of dc flat-wave reactor L2, the electric current output of dc flat-wave reactor L2 is connected with the electric current input of inverter, the electric current output of inverter is connected with the electric current input of the second three-phase reactor L3, the electric current output of the second three-phase reactor L3 is connected with the electric current input of starting contactor K2, and the electric current output of starting contactor K2 and the electric current output of bypass contactor K3 are connected with the electric current input of motor 1 respectively.Between the first three-phase reactor L1 and diode rectifier bridge, be in series with fast acting fuse.
Air switch K1 is used to overhaul disconnection and overcurrent, overload protection.When motor 1 starts, starting contactor K2 closure, bypass contactor K3 disconnects.Diode rectifier bridge is rectified into direct voltage to three-phase alternating voltage and powers to filtering capacitor.When initially powering on, for avoiding impulse current, K switch
RDisconnect.With resistance R is the capacitor charging.Charging finishes, K switch
RClosed.The first three-phase reactor L1 is the three-phase reactor of restriction inlet wire current aberration rate.Two IGBTQ1, Q2 and double diode D1, D2 form DC chopped-wave voltage-regulating circuit 2, and its effect is that the control direct current can be constant, also can quickly fall to 0.The thyristor inversion bridge is used for the 120 degree square wave current actuating motors 1 of output frequency 1-50HZ as inverter.The second three-phase reactor L3 is the output three-phase reactor of restriction controllable silicon overvoltage and dv/dt.Start and finish, starting contactor K2 disconnects, bypass contactor K3 closure, directly mains supply.
Present embodiment motor frequency change soft initiator solved that electric current reduces and staring torque by the contradiction of square reduction, employing motor 1 frequency of supply rises to the variable frequency starting mode of 50HZ gradually from 1HZ.Compare with traditional soft starting mode, motor 1 starting current is at 6 times (for example 200KW motor frequency conversion starting current 210A) that descend.Be reduced to 1/36 problem in order to solve staring torque, frequency reduces by 50 times, and staring torque improves 1.3 times on the contrary.On the other hand, power factor is lower during motor 1 light-load starting, if the employing power factor is 1 technology, the grid side supply current is also lower than motor 1 starting current, be 0.38 of motor 1 rated current, mains supply electric current 137A during the 200KW motor start-up for example.Therefore, it is below 1/11 of traditional soft starter mains supply electric current that present embodiment motor frequency change soft initiator starts the mains supply electric current, and motor 1 starting current is reduced to below 1/6.The grid side power factor rises to 1 from 0.1.Realized " soft start " truly.
Claims (2)
1. motor frequency change soft initiator, it is characterized in that, the electric current input of bypass contactor and the electric current input of air switch are connected with power supply respectively, the electric current output of air switch is connected with the electric current input of first three-phase reactor, the electric current output of first three-phase reactor is connected with the electric current input of diode rectifier bridge, the electric current output of diode rectifier bridge is connected with the electric current input of filtering capacitor, the electric current output of filtering capacitor is connected with the electric current input of DC chopped-wave voltage-regulating circuit (2), the electric current output of DC chopped-wave voltage-regulating circuit (2) is connected with the electric current input of dc flat-wave reactor, the electric current output of dc flat-wave reactor is connected with the electric current input of inverter, the electric current output of inverter is connected with the electric current input of second three-phase reactor, the electric current output of second three-phase reactor is connected with the electric current input of starting contactor, and the electric current output of starting contactor and the electric current output of bypass contactor are connected with the electric current input of motor (1) respectively.
2. motor frequency change soft initiator according to claim 1 is characterized in that, is in series with fast acting fuse between first three-phase reactor and the diode rectifier bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201791115U CN202059356U (en) | 2011-05-31 | 2011-05-31 | Motor frequency conversion soft starter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201791115U CN202059356U (en) | 2011-05-31 | 2011-05-31 | Motor frequency conversion soft starter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202059356U true CN202059356U (en) | 2011-11-30 |
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ID=45019319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201791115U Expired - Fee Related CN202059356U (en) | 2011-05-31 | 2011-05-31 | Motor frequency conversion soft starter |
Country Status (1)
| Country | Link |
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| CN (1) | CN202059356U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751925A (en) * | 2012-06-29 | 2012-10-24 | 北京工业大学 | Cage type rotor permanent magnetic synchro motor starting device and control method |
| CN103178760A (en) * | 2013-02-28 | 2013-06-26 | 岳群生 | Soft starting method and soft starter for asynchronous starting permanent-magnet synchronous motors |
| CN104767223A (en) * | 2015-04-20 | 2015-07-08 | 三峡大学 | Rotary type generator unit and prime motor flexible connection grid-connected system and use method thereof |
-
2011
- 2011-05-31 CN CN2011201791115U patent/CN202059356U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751925A (en) * | 2012-06-29 | 2012-10-24 | 北京工业大学 | Cage type rotor permanent magnetic synchro motor starting device and control method |
| CN102751925B (en) * | 2012-06-29 | 2014-12-31 | 北京工业大学 | Cage type rotor permanent magnetic synchro motor starting device and control method |
| CN103178760A (en) * | 2013-02-28 | 2013-06-26 | 岳群生 | Soft starting method and soft starter for asynchronous starting permanent-magnet synchronous motors |
| CN103178760B (en) * | 2013-02-28 | 2016-04-20 | 岳群生 | A kind of asynchronous starting permanent magnet synchronous motor soft-starting method and soft starter |
| CN104767223A (en) * | 2015-04-20 | 2015-07-08 | 三峡大学 | Rotary type generator unit and prime motor flexible connection grid-connected system and use method thereof |
| CN104767223B (en) * | 2015-04-20 | 2017-03-08 | 三峡大学 | A kind of rotary generator group and prime mover are flexible coupling grid-connected system and its using method |
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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: 20111130 Termination date: 20130531 |