CN2381055Y - Phaseloose protector for motor - Google Patents
Phaseloose protector for motor Download PDFInfo
- Publication number
- CN2381055Y CN2381055Y CN 99212872 CN99212872U CN2381055Y CN 2381055 Y CN2381055 Y CN 2381055Y CN 99212872 CN99212872 CN 99212872 CN 99212872 U CN99212872 U CN 99212872U CN 2381055 Y CN2381055 Y CN 2381055Y
- Authority
- CN
- China
- Prior art keywords
- relay
- phase
- motor
- diode
- contactor
- 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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- Motor And Converter Starters (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The utility model provides a phase-failure protector for a motor. Three symmetrical capacitors are respectively connected with three-phase wires according to star connection, a star point is connected with a relay coil after rectified by a diode, and the normally closed contacts of the relay are connected with a control loop of a main contactor. When any phase failure of a three-phase power cord is opposite, star point voltage displaces, the relay can operate after the star point voltage is rectified by the diode, the contactor has power cut, and the motor can not operate any longer when the normally closed contacts D and E are disconnected. The utility model has the advantages of simple circuit, few elements, low cost and high reliability.
Description
The utility model relates to a kind of open phase protector of motor, belongs to emergency protective circuit device class.
Existing three phase electric machine generally adopts A.C. contactor or auto-transformer starter control, and when having one to cut off the power supply mutually in the three-phase power line, A.C. contactor or auto-transformer starter coil might not cut off the power supply, so that very easily burn out motor.
The purpose of this utility model is to provide a kind of open phase protector of motor, and any one when cutting off the power supply mutually in three-phase power line, can guarantee the coil blackout of A.C. contactor, and electromagnet is discharged, and cuts off motor power, prevents that motor from moving under the phase shortage situation and burnt.
The purpose of this utility model is achieved in that by three symmetrical electric capacity and connects three-phase power line respectively by star connection that its asterism is the cut-in relay coil after the diode bridge rectification, in the control loop of relay normally-closed contact access main contactor.
The utility model utilizes three-phase imbalance neutral displacement principle, by directly promoting relay work after the diode bridge rectification.Circuit is simple, and element is few, and cost is low, good reliability.
Below in conjunction with accompanying drawing the utility model embodiment is described.
Fig. 1 is the utility model circuit structure schematic diagram.
Fig. 2 is that the utility model is at the operating protection winding diagram of motor.
Among Fig. 1, capacitor C 1, C2 and C3 insert three-phase power line A, B, C respectively by star connection, and its asterism N is cut-in relay J coil behind diode D1, D2, D3 and D4 bridge rectifier.Among Fig. 2; in the control loop of relay J normally-closed contact D, E incoming transport contactor C; X1, X2 and X3 are respectively three phase mains; HK is a threephase switch, and QA is a starting button, and TA is a stop button; C is the A.C. contactor control coil; HR is the A.C. contactor main contacts, and DJ is a motor, and BH is this protector.
Its operation principle is: when the normal distribution of three phase mains, asterism N voltage is low or be 0, the input of no-voltage electric current, relay J is failure to actuate, when arbitrary when cutting off the power supply mutually in the triple line, and asterism N electric voltage displacement, it will be by the synthetic alternating voltage of other two-phase vector addition, behind diode D1, D2, D3 and D4 bridge full-wave rectifier, input relay J coil, the actuating of relay, disconnect normally-closed contact D, E, this moment main contactor C coil blackout, contactor loss of excitation and tripping outage, the phase shortage motor does not rerun.
Claims (1)
1. open phase protector of motor; comprise electric capacity, diode and relay; it is characterized in that three symmetrical capacitor C 1, C2 and C3 meet three-phase power line A, B, C respectively by star connection; its asterism N is cut-in relay J coil behind diode D1, D2, D3 and D4 bridge rectifier, and relay J normally-closed contact D, E insert in the control loop of main contactor C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99212872 CN2381055Y (en) | 1999-06-04 | 1999-06-04 | Phaseloose protector for motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99212872 CN2381055Y (en) | 1999-06-04 | 1999-06-04 | Phaseloose protector for motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2381055Y true CN2381055Y (en) | 2000-05-31 |
Family
ID=34005434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99212872 Expired - Fee Related CN2381055Y (en) | 1999-06-04 | 1999-06-04 | Phaseloose protector for motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2381055Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917150A (en) * | 2015-07-03 | 2015-09-16 | 国网辽宁省电力有限公司抚顺供电公司 | Simple motor open-phase protector device |
-
1999
- 1999-06-04 CN CN 99212872 patent/CN2381055Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917150A (en) * | 2015-07-03 | 2015-09-16 | 国网辽宁省电力有限公司抚顺供电公司 | Simple motor open-phase protector device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |