CN2269017Y - Phase-off protector for three phase motor - Google Patents
Phase-off protector for three phase motor Download PDFInfo
- Publication number
- CN2269017Y CN2269017Y CN 96228176 CN96228176U CN2269017Y CN 2269017 Y CN2269017 Y CN 2269017Y CN 96228176 CN96228176 CN 96228176 CN 96228176 U CN96228176 U CN 96228176U CN 2269017 Y CN2269017 Y CN 2269017Y
- Authority
- CN
- China
- Prior art keywords
- phase
- resistance
- triode
- voltage
- protector
- 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 relates to a phase interruption protector for a three-phase motor, which mainly comprises an input circuit, and the input circuit is connected with an executive circuit by a resistor R < 1 >. The input circuit and the executive circuit adopts electronic elements, so the weight of the utility model is lightened, the action sensitivity is raised, and the utility model has the advantages of simple structure, convenient maintenance, low cost and simple machining.
Description
The utility model relates to motor protecting device, specifically is a kind of open-phase protector for three phase motor.
Now; the installation phase failure protector is seldom arranged on single-phase motor; to making the motor easy burn-out; cause unnecessary loss; in use; people have also designed multiple electric motor electron phase failure protector; as the disclosed ZL93205464 of Chinese patent; three phase electric machine electronics phase failure protector, it is the induced potential in phase failure rear motor winding of taking a sample, and adopts three pairs of sampling input signal ends; a pair of output control signal end; connect with outside with being no less than eight junction blocks, set up anti-high-voltage breakdown of buffering and overcurrent protection function, make motor when work, obtain protection preferably; but still there has been complex structure; safeguard inconvenience, cost height, the defective that reliable in action is relatively poor.
The purpose of this utility model is to provide a kind of simple in structure, easy to maintenance, reliable in action, open-phase protector for three phase motor that cost is low.
The utility model is achieved through the following technical solutions:
Be open-phase protector for three phase motor, mainly comprise input circuit, input circuit is through resistance R
1Be connected with executive circuit.
Above-mentioned input circuit is that three phase mains is respectively through diode D
1～D
3Connect resistance R
1One end, executive circuit are by triode BG
1, BG
2, resistance R
2～R
4, capacitor C
1, C
2, relay J and voltage-stabiliser tube 2CW form capacitor C
1, C
2, voltage-stabiliser tube 2CW, resistance R
3And an end of relay J respectively with resistance R
1The other end connects, capacitor C
1The other end connects triode BG respectively
1, BG
2Emitter, the other end of voltage-stabiliser tube 2CW is through resistance R
2Connect triode BG
2Base stage, capacitor C simultaneously
2The other end connect triode BG
1Base stage, triode BG
1, collector electrode and resistance R
3The other end connects, simultaneously also through resistance R
4With triode BG
2Base stage connect the other end of its collector connection relay J, the over-voltage breakdown triode BG that produces in outage moment for the coil that prevents relay J
2, diode D in parallel on relay J also
4
Further describe below in conjunction with accompanying drawing:
Fig. 1, the utility model circuit diagram.
As shown in the figure, three-phase alternating voltage is through triode D
1～D
3Become direct voltage after the rectification, through resistance R
1Step-down, capacitor C
1Obtain a low dc voltage after the filtering, capacitor C
2Switching on moment, play and stablize triode BG
1The effect of voltage, this voltage is higher than the conducting voltage of voltage-stabiliser tube 2CW, makes voltage-stabiliser tube 2CW conducting, passes through resistance R
2After make triode BG
1Conducting, then triode BG
1Collector electrode is electronegative potential, triode BG
2Base stage do not end because of there being high potential, relay J is failure to actuate, electric motor normal working.
When three phase mains is arbitrary when disconnecting suddenly mutually, through diode D
1～D
3In the rectification of appointing two-phase, through resistance R
1Voltage after the step-down is lower than the conducting voltage of voltage-stabiliser tube 2CW, not conducting of voltage-stabiliser tube 2CW, thereby triode BG
1Dead electricity is ended, triode BG
1Collector electrode is high potential, and power supply is through resistance R
3, R
4Be added to BG after the current limliting
2Base stage makes triode BG
2Conducting, the relay J action, deenergization, thus motor is protected.
This protector is applicable to the threephase motor of any model, and do not need the termination of motor is changed.
The utlity model has following advantage:
1, simple in structure, easy to maintenance.
2, low, the handling ease of cost.
3, applied widely.
Claims (4)
1, a kind of open-phase protector for three phase motor mainly comprises input circuit, it is characterized in that input circuit is through resistance R
1Connect executive circuit.
2, open-phase protector for three phase motor according to claim 1 is characterized in that input circuit is that three phase mains is respectively through diode D
1～D
3Connect resistance R
1One end.
3,, it is characterized in that executive circuit is by triode BG according to claim 1,2 described open-phase protector for three phase motor
1, BG
2, resistance R
2～R
4, capacitor C
1, C
2, relay J and voltage-stabiliser tube 2CW form capacitor C
1, C
2, voltage-stabiliser tube 2CW, resistance R
3And an end of relay J respectively with resistance R
1The other end connects, capacitor C
1The other end connects triode BG respectively
1, BG
2Emitter, the other end of voltage-stabiliser tube 2CW is through resistance R
2Connect triode BG
2Base stage, capacitor C simultaneously
2The other end connect triode BG
1Base stage, triode BG
1Collector electrode and resistance R
3The other end connects, simultaneously also through resistance R
4With triode BG
2Base stage connect the other end of its collector connection relay J.
4, open-phase protector for three phase motor according to claim 1 is characterized in that at relay J diode D in parallel
4
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96228176 CN2269017Y (en) | 1996-06-21 | 1996-06-21 | Phase-off protector for three phase motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96228176 CN2269017Y (en) | 1996-06-21 | 1996-06-21 | Phase-off protector for three phase motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2269017Y true CN2269017Y (en) | 1997-11-26 |
Family
ID=33906125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96228176 Expired - Fee Related CN2269017Y (en) | 1996-06-21 | 1996-06-21 | Phase-off protector for three phase motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2269017Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102214913A (en) * | 2011-05-09 | 2011-10-12 | 中国振华集团群英无线电器材厂 | Sealed phase shortage protection relay of three-phase source |
-
1996
- 1996-06-21 CN CN 96228176 patent/CN2269017Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102214913A (en) * | 2011-05-09 | 2011-10-12 | 中国振华集团群英无线电器材厂 | Sealed phase shortage protection relay of three-phase source |
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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 |