CN204578070U - Open-phase protection circuit of motor - Google Patents
Open-phase protection circuit of motor Download PDFInfo
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- CN204578070U CN204578070U CN201520332456.8U CN201520332456U CN204578070U CN 204578070 U CN204578070 U CN 204578070U CN 201520332456 U CN201520332456 U CN 201520332456U CN 204578070 U CN204578070 U CN 204578070U
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Abstract
Open-phase protection circuit of motor, belongs to Motor Control Field, and the utility model is for solving existing open-phase protection circuit of motor Problems existing.The utility model comprises circuit breaker Q S1, QS2, stop button SB1, SB3, start button SB2, A.C. contactor KM, three-phase thermal relay FR, three-phase commutation bridge Z1, Z2, direct current relay KA1, auxiliary relay KA2, indicator light HL1 ~ HL3; Stop button SB1 and stop button SB3 is linked switch; Z1, Z2 gather the default phase signal of three phase electric machine M; If phase shortage, the Z2 output voltage gathering 380V alternating voltage is constant, but the output voltage gathering the Z1 of three phase electric machine M three-phase voltage signal obviously reduces, KA1 coil obtains electric adhesive, and KA1-2 closes, and KA2 coil obtains electric adhesive, normally-closed contact KA2-1 disconnects, KM coil losing electricity, its main contacts KM-1 disconnects, then three phase electric machine M quits work.
Description
Technical field
The utility model relates to a kind of open-phase protection circuit, belongs to Motor Control Field.
Background technology
For three phase electric machine conventional in life, phase-deficient operation is one of major reason causing burn-down of electric motor.Special phase-lacking protective device is multiplex in the startup optimization circuit of large-size machine, generally uses zero sequence current mutual inductor to carry out open-phase protection, but the general product adopting foreign import, its cost is higher, and circuit connects cumbersome.And short circuit and overload protection be only equipped with for most middle and small motor.When circuit has a short trouble, air circuit QF can jump disconnected, and during overload, larger electric current can make thermal relay FR action, thus makes contactor KM coil losing electricity, plays a protective role.And when motor is in running, when causing phase shortage phenomenon to occur for a certain reason, motor will soon be burnt.
Summary of the invention
The utility model object is to solve existing open-phase protection circuit of motor Problems existing, providing a kind of open-phase protection circuit of motor.
Open-phase protection circuit of motor described in the utility model, it comprises three-phase breaker QS1, single-phase circuit breaker QS2, stop button SB1, stop button SB3, start button SB2, A.C. contactor KM, three-phase thermal relay FR, three-phase commutation bridge Z1, three-phase commutation bridge Z2, direct current relay KA1, auxiliary relay KA2, indicator light HL1, indicator light HL2 and indicator light HL3;
Three phase electric machine M is connected 380V AC power by the main contacts KM-1 that often opens of the three-phase thermal relay FR that connects successively, A.C. contactor KM with three-phase breaker QS1;
Stop button SB1 and stop button SB3 is linked switch;
Three ac input ends of three-phase commutation bridge Z1 connect three live wires between three-phase thermal relay FR and three phase electric machine M; Three ac input ends of three-phase commutation bridge Z2 connect three live wires often opened between main contacts KM-1 of three-phase breaker QS1 and A.C. contactor KM; The cathode output end of three-phase commutation bridge Z1 connects the cathode output end of three-phase commutation bridge Z2; The cathode output end of three-phase commutation bridge Z1 connects one end of direct current relay KA1 coil, the other end of direct current relay KA1 coil connects one end that A.C. contactor KM often leaves auxiliary contact KM-5, and A.C. contactor KM often leaves the cathode output end of the other end connection three-phase commutation bridge Z2 of auxiliary contact KM-5;
One end of single-phase circuit breaker QS2 connects live wire L3, and the other end of single-phase circuit breaker QS2 connects one end of stop button SB1 simultaneously, one end of stop button SB3, one end of A.C. contactor KM normally closed auxiliary contact KM-3, A.C. contactor KM often open one end of auxiliary contact KM-4 and one end of auxiliary relay KA2 normally opened contact KA2-3;
The other end of stop button SB1 connects one end that one end of start button SB2 and A.C. contactor KM often leave auxiliary contact KM-2 simultaneously, the other end that the other end and the A.C. contactor KM of start button SB2 often open auxiliary contact KM-2 is connected one end of direct current relay KA1 normally opened contact KA1-1 simultaneously, the other end of direct current relay KA1 normally opened contact KA1-1 connects one end of auxiliary relay KA2 normally-closed contact KA2-1, the other end of auxiliary relay KA2 normally-closed contact KA2-1 connects one end of A.C. contactor KM coil, the other end of A.C. contactor KM coil connects one end of three-phase thermal relay FR normally closed auxiliary contact,
The other end of stop button SB3 connects one end of direct current relay KA1 normally opened contact KA1-2 and one end of auxiliary relay KA2 normally opened contact KA2-2 simultaneously, and the other end and the other end of auxiliary relay KA2 normally opened contact KA2-2 of direct current relay KA1 normally opened contact KA1-2 are connected one end of auxiliary relay KA2 coil simultaneously;
The other end of A.C. contactor KM normally closed auxiliary contact KM-3 connects one end of indicator light HL1;
A.C. contactor KM often leaves one end of the other end connection indicator light HL2 of auxiliary contact KM-4;
The other end of auxiliary relay KA2 normally opened contact KA2-3 connects one end of indicator light HL3;
The other end of three-phase thermal relay FR normally closed auxiliary contact, the other end of auxiliary relay KA2 coil, the other end of indicator light HL1, the other end of indicator light HL2 are connected zero line N with the other end of indicator light HL3 simultaneously.
Advantage of the present utility model: open-phase protection circuit of motor described in the utility model adopts some discrete component forming circuits; with low cost; applied range; and this circuit performance is stablized; detection sensitivity is high; once motor phase failure be detected, motor power is cut off in action immediately, avoids motor to be burnt.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of open-phase protection circuit of motor described in the utility model.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, open-phase protection circuit of motor described in present embodiment, it comprises three-phase breaker QS1, single-phase circuit breaker QS2, stop button SB1, stop button SB3, start button SB2, A.C. contactor KM, three-phase thermal relay FR, three-phase commutation bridge Z1, three-phase commutation bridge Z2, direct current relay KA1, auxiliary relay KA2, indicator light HL1, indicator light HL2 and indicator light HL3;
Three phase electric machine M is connected 380V AC power by the main contacts KM-1 that often opens of the three-phase thermal relay FR that connects successively, A.C. contactor KM with three-phase breaker QS1;
Stop button SB1 and stop button SB3 is linked switch;
Three ac input ends of three-phase commutation bridge Z1 connect three live wires between three-phase thermal relay FR and three phase electric machine M; Three ac input ends of three-phase commutation bridge Z2 connect three live wires often opened between main contacts KM-1 of three-phase breaker QS1 and A.C. contactor KM; The cathode output end of three-phase commutation bridge Z1 connects the cathode output end of three-phase commutation bridge Z2; The cathode output end of three-phase commutation bridge Z1 connects one end of direct current relay KA1 coil, the other end of direct current relay KA1 coil connects one end that A.C. contactor KM often leaves auxiliary contact KM-5, and A.C. contactor KM often leaves the cathode output end of the other end connection three-phase commutation bridge Z2 of auxiliary contact KM-5;
One end of single-phase circuit breaker QS2 connects live wire L3, and the other end of single-phase circuit breaker QS2 connects one end of stop button SB1 simultaneously, one end of stop button SB3, one end of A.C. contactor KM normally closed auxiliary contact KM-3, A.C. contactor KM often open one end of auxiliary contact KM-4 and one end of auxiliary relay KA2 normally opened contact KA2-3;
The other end of stop button SB1 connects one end that one end of start button SB2 and A.C. contactor KM often leave auxiliary contact KM-2 simultaneously, the other end that the other end and the A.C. contactor KM of start button SB2 often open auxiliary contact KM-2 is connected one end of direct current relay KA1 normally opened contact KA1-1 simultaneously, the other end of direct current relay KA1 normally opened contact KA1-1 connects one end of auxiliary relay KA2 normally-closed contact KA2-1, the other end of auxiliary relay KA2 normally-closed contact KA2-1 connects one end of A.C. contactor KM coil, the other end of A.C. contactor KM coil connects one end of three-phase thermal relay FR normally closed auxiliary contact,
The other end of stop button SB3 connects one end of direct current relay KA1 normally opened contact KA1-2 and one end of auxiliary relay KA2 normally opened contact KA2-2 simultaneously, and the other end and the other end of auxiliary relay KA2 normally opened contact KA2-2 of direct current relay KA1 normally opened contact KA1-2 are connected one end of auxiliary relay KA2 coil simultaneously;
The other end of A.C. contactor KM normally closed auxiliary contact KM-3 connects one end of indicator light HL1;
A.C. contactor KM often leaves one end of the other end connection indicator light HL2 of auxiliary contact KM-4;
The other end of auxiliary relay KA2 normally opened contact KA2-3 connects one end of indicator light HL3;
The other end of three-phase thermal relay FR normally closed auxiliary contact, the other end of auxiliary relay KA2 coil, the other end of indicator light HL1, the other end of indicator light HL2 are connected zero line N with the other end of indicator light HL3 simultaneously.
Three-phase commutation bridge Z1 and three-phase commutation bridge Z2 is the full bridge rectifier be made up of six diodes.
Direct current relay KA1 is 220V direct current relay or 24V direct current relay.
Operation principle:
QS1 and QS2 that close is that three phase electric machine M startup work is prepared, and press SB2 starter motor, after pressing SB2, KM coil obtains electric, and main contacts KM-1 closes, and motor obtains electric work, and meanwhile, KM-2 closes self-locking; KM-4 closes, HL2 bright indication motor startup work; KM-5 closes, and prepares for KA1 detects phase shortage.
The sampled signal of three-phase commutation bridge Z1 is the three-phase voltage signal of three phase electric machine M, and the sampled signal of three-phase commutation bridge Z2 is the three-phase ac signal of 380V AC power; Under normal conditions, the output voltage of Z1 and Z2 is equal, and the voltage difference at KA1 coil two ends is 0, namely KA1 coil must not be electric, and KA1-2 remains open, and KA2 coil does not also obtain motor meeting, then KA1-1 and KA2-1 is kept closed, and KM coil keeps obtaining electricity condition, and three phase electric machine M normally runs.
Once a certain phase phase shortage of motor, the Z2 output voltage gathering 380V alternating voltage is constant, but the output voltage gathering the Z1 of three phase electric machine M three-phase voltage signal obviously reduces, KA1 coil obtains electric adhesive, and KA1-2 closes, and KA2 coil obtains electric adhesive, normally-closed contact KA2-1 disconnects, KM coil losing electricity, its main contacts KM-1 disconnects, then three phase electric machine M quits work.KA2-2 closes self-locking simultaneously, and it is the action that KM coil power is cut off in memory that this road is arranged, and KA2-3 closes simultaneously, and the bright instruction of HL3 is now non-full-phase state.
Start after phase shortage, because of motor there is phase shortage time, KA2 coil obtains electric adhesive, and KA2-2 closes self-locking, and the normally-closed contact KA1-1 that KA is connected in KM wire loop is still in off-state, make KM wire loop disconnect and cannot start-up operation be carried out.After open-phase fault is got rid of, start-up operation need be carried out, then must first click stop button SB1, its interlock button SB3 also disconnects like this, has cut off memory KA2 wire loop power supply, KA2 coil blackout discharges, KA1-1 recovers normally closed, and for KM coil working provides condition, KA2-3 recovers often to open, indicator light HL3 goes out, and illustrates that open-phase fault has been got rid of and removed memory.After above-mentioned work completes, can press start button SB2 again, KM coil obtains electric, and KM-1 closes, and three phase electric machine M restarts, and now KM-4 closes, and HL2 is bright, shows that motor starts running again.
Claims (3)
1. open-phase protection circuit of motor, it is characterized in that, it comprises three-phase breaker QS1, single-phase circuit breaker QS2, stop button SB1, stop button SB3, start button SB2, A.C. contactor KM, three-phase thermal relay FR, three-phase commutation bridge Z1, three-phase commutation bridge Z2, direct current relay KA1, auxiliary relay KA2, indicator light HL1, indicator light HL2 and indicator light HL3;
Three phase electric machine M is connected 380V AC power by the main contacts KM-1 that often opens of the three-phase thermal relay FR that connects successively, A.C. contactor KM with three-phase breaker QS1;
Stop button SB1 and stop button SB3 is linked switch;
Three ac input ends of three-phase commutation bridge Z1 connect three live wires between three-phase thermal relay FR and three phase electric machine M; Three ac input ends of three-phase commutation bridge Z2 connect three live wires often opened between main contacts KM-1 of three-phase breaker QS1 and A.C. contactor KM; The cathode output end of three-phase commutation bridge Z1 connects the cathode output end of three-phase commutation bridge Z2; The cathode output end of three-phase commutation bridge Z1 connects one end of direct current relay KA1 coil, the other end of direct current relay KA1 coil connects one end that A.C. contactor KM often leaves auxiliary contact KM-5, and A.C. contactor KM often leaves the cathode output end of the other end connection three-phase commutation bridge Z2 of auxiliary contact KM-5;
One end of single-phase circuit breaker QS2 connects live wire L3, and the other end of single-phase circuit breaker QS2 connects one end of stop button SB1 simultaneously, one end of stop button SB3, one end of A.C. contactor KM normally closed auxiliary contact KM-3, A.C. contactor KM often open one end of auxiliary contact KM-4 and one end of auxiliary relay KA2 normally opened contact KA2-3;
The other end of stop button SB1 connects one end that one end of start button SB2 and A.C. contactor KM often leave auxiliary contact KM-2 simultaneously, the other end that the other end and the A.C. contactor KM of start button SB2 often open auxiliary contact KM-2 is connected one end of direct current relay KA1 normally opened contact KA1-1 simultaneously, the other end of direct current relay KA1 normally opened contact KA1-1 connects one end of auxiliary relay KA2 normally-closed contact KA2-1, the other end of auxiliary relay KA2 normally-closed contact KA2-1 connects one end of A.C. contactor KM coil, the other end of A.C. contactor KM coil connects one end of three-phase thermal relay FR normally closed auxiliary contact,
The other end of stop button SB3 connects one end of direct current relay KA1 normally opened contact KA1-2 and one end of auxiliary relay KA2 normally opened contact KA2-2 simultaneously, and the other end and the other end of auxiliary relay KA2 normally opened contact KA2-2 of direct current relay KA1 normally opened contact KA1-2 are connected one end of auxiliary relay KA2 coil simultaneously;
The other end of A.C. contactor KM normally closed auxiliary contact KM-3 connects one end of indicator light HL1;
A.C. contactor KM often leaves one end of the other end connection indicator light HL2 of auxiliary contact KM-4;
The other end of auxiliary relay KA2 normally opened contact KA2-3 connects one end of indicator light HL3;
The other end of three-phase thermal relay FR normally closed auxiliary contact, the other end of auxiliary relay KA2 coil, the other end of indicator light HL1, the other end of indicator light HL2 are connected zero line N with the other end of indicator light HL3 simultaneously.
2. open-phase protection circuit of motor according to claim 1, it is characterized in that, three-phase commutation bridge Z1 and three-phase commutation bridge Z2 is the full bridge rectifier be made up of six diodes.
3. open-phase protection circuit of motor according to claim 1, it is characterized in that, direct current relay KA1 is 220V direct current relay or 24V direct current relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520332456.8U CN204578070U (en) | 2015-05-21 | 2015-05-21 | Open-phase protection circuit of motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520332456.8U CN204578070U (en) | 2015-05-21 | 2015-05-21 | Open-phase protection circuit of motor |
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| Publication Number | Publication Date |
|---|---|
| CN204578070U true CN204578070U (en) | 2015-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520332456.8U Expired - Fee Related CN204578070U (en) | 2015-05-21 | 2015-05-21 | Open-phase protection circuit of motor |
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| CN (1) | CN204578070U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018898A (en) * | 2016-08-12 | 2016-10-12 | 山东省产品质量检验研究院 | Massage device and electric heating food temperature rise testbed |
| CN106384939A (en) * | 2016-09-05 | 2017-02-08 | 衢州市依科达节能技术有限公司 | Distribution box with open-phase protection |
| CN115065033A (en) * | 2022-05-16 | 2022-09-16 | 中国一冶集团有限公司 | Three-phase alternating current open-phase protection switch control box and control method thereof |
-
2015
- 2015-05-21 CN CN201520332456.8U patent/CN204578070U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018898A (en) * | 2016-08-12 | 2016-10-12 | 山东省产品质量检验研究院 | Massage device and electric heating food temperature rise testbed |
| CN106018898B (en) * | 2016-08-12 | 2019-03-01 | 山东省产品质量检验研究院 | A kind of massage apparatus testing stand |
| CN106384939A (en) * | 2016-09-05 | 2017-02-08 | 衢州市依科达节能技术有限公司 | Distribution box with open-phase protection |
| CN115065033A (en) * | 2022-05-16 | 2022-09-16 | 中国一冶集团有限公司 | Three-phase alternating current open-phase protection switch control box and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150819 Termination date: 20160521 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |