CN2310412Y - Phase loss protector for three-phase asynchronous motor - Google Patents
Phase loss protector for three-phase asynchronous motor Download PDFInfo
- Publication number
- CN2310412Y CN2310412Y CN 97221750 CN97221750U CN2310412Y CN 2310412 Y CN2310412 Y CN 2310412Y CN 97221750 CN97221750 CN 97221750 CN 97221750 U CN97221750 U CN 97221750U CN 2310412 Y CN2310412 Y CN 2310412Y
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- phase
- relay
- utility
- model
- motor
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Abstract
The utility model provides an open-phase protector for a three-phase asynchronous motor. The utility model is characterized in that the neutral contact point of a motor winding is connected with a relay which is provided with a normally closed contact, the other end of an inductance coil is grounded, and the normally closed contact is connected with an AC contactor control coil loop which is used for controlling three-phase alternating current; a rectifying diode can be connected in series between the neutral contact point and the relay and a capacitor can be connected in parallel between the neutral contact point and the relay, and the rectifying diode and the capacitor can be controlled by a DC relay. The utility model has the advantages of simple structure, convenient installation, low failure rate, high reliability, high safety, quick control, high flexibility, etc. The utility model is suitable for the open-phase protection of various three-phase asynchronous motors.
Description
The utility model relates to a kind of the motor emergency protective device that prevents to be interrupted mutually and to reduce voltage, especially three-phase asynchronous motor open-phase protect device.
Widely used phase asynchronous alternating current motor adopts star and triangle method of attachment usually now, and under normal circumstances its junctional potential is near zero potential.But, in practical operation and use, tend to cause a certain the interruption mutually in the three phase mains and stop power supply by a variety of causes, produce phase shortage outage phenomenon, if this moment is the power supply of untimely cut-out motor, is allowed to condition under the above-mentioned phase shortage situation to work on, and output power of motor is reduced rapidly, electric current increases, and temperature rise is accelerated even burnt winding coil.Chinese patent CN2059283U discloses a kind of " threephase motor open phase protector "; it comprises the treatment circuit of being made up of rectifier diode, voltage-stabiliser tube and resistance capacitance etc.; a holding wire that links to each other with the zero-potential point of threephase motor winding; the relay that has two contacts; one terminates on the described holding wire, and one of them normally-closed contact is serially connected in the control circuit of threephase motor.This open phase protector structure is complicated, and the used components and parts of treatment circuit are many, and various faults take place easily, and reliability is difficult to guarantee.In addition, this protector only is fit to be used for protect the motor that adopts delta connection, for using more widely the star connection motor then can not be protected well.
The purpose of this utility model just is to overcome above-mentioned weak point of the prior art, provides a kind of simple in structure, and it is convenient to install; components and parts are few; failure rate is low, and reliability and fail safe are all higher, control rapidly, three-phase asynchronous motor open-phase protect device flexibly.
The purpose of this utility model can reach by implementing following technical proposal: the relay that connects a band normally-closed contact at threephase asynchronous winding neutral contact place, the other end ground connection of its induction coil, its normally-closed contact are serially connected in the A.C. contactor control coil loop of control three-phase alternating current.Can also be connected in series a rectifier diode and a capacitor in parallel with relay between described neutral contact and relay, described relay adopts the straight flow relay.
Accompanying drawing is the electrical connection schematic diagram of the utility model embodiment.
Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail.Be serially connected with rectifier diode D and band normally-closed contact J at the threephase asynchronous winding neutral contact O place that connects by star connection
1Direct current relay J, with relay J and be connected with capacitor C, the other end ground connection of relay J induction coil constitutes treatment circuit thus.The normally-closed contact J of described relay J
1Be serially connected in the A.C. contactor K control coil L loop that is used for controlling the motor alternating current.When using the utility model product, it can be directly installed in the terminal box of motor, by control coil L loop among the closed A.C. contactor K, make A.C. contactor K closure that three-phase alternating current is delivered to threephase asynchronous and carry out work.When in the three-phase AC line any one when cutting off the power supply mutually, voltage on the neutral contact O of motor winding will rise to about 110 volts from about 0 volt, rectified action by rectifier diode D and capacitor C produces electric current in the induction coil of direct current relay J, and then triggers normally-closed contact J
1Disconnect, make A.C. contactor K tripping, cut off the power supply of threephase asynchronous.Thereby played under improper situation the effect of protection motor.
The utility model has simple in structurely compared with prior art, and it is convenient to install, and components and parts are few, fault Rate is low, and reliability and security are all higher, and controls the characteristics such as rapid, flexible, is suitable for various three different The open-phase protection of step motor.
Claims (2)
1, a kind of three-phase asynchronous motor open-phase protect device; comprise testing circuit, relay; it is characterized in that going up the relay (J) that connects a band normally-closed contact (J1) by the threephase asynchronous winding neutral contact (0) of star connection; the other end ground connection of its induction coil, normally-closed contact (J1) are serially connected in the loop of A.C. contactor (K) control coil (L) that is used for controlling the motor alternating current.
2, three-phase asynchronous motor open-phase protect device according to claim 1; it is characterized in that being serially connected with rectifier diode (D) between above-mentioned neutral contact (0) and the relay (J); with relay (J) and be connected with capacitor (C), relay (J) is a direct current relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97221750 CN2310412Y (en) | 1997-07-17 | 1997-07-17 | Phase loss protector for three-phase asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97221750 CN2310412Y (en) | 1997-07-17 | 1997-07-17 | Phase loss protector for three-phase asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2310412Y true CN2310412Y (en) | 1999-03-10 |
Family
ID=33937047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97221750 Expired - Fee Related CN2310412Y (en) | 1997-07-17 | 1997-07-17 | Phase loss protector for three-phase asynchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2310412Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151977A (en) * | 2011-12-06 | 2013-06-12 | 海德堡印刷机械股份公司 | Simplified electric brake device |
-
1997
- 1997-07-17 CN CN 97221750 patent/CN2310412Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151977A (en) * | 2011-12-06 | 2013-06-12 | 海德堡印刷机械股份公司 | Simplified electric brake device |
| CN103151977B (en) * | 2011-12-06 | 2017-08-29 | 海德堡印刷机械股份公司 | Simplified electric braking 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 |