CN204464961U - Motor overcurrent protection warning device - Google Patents
Motor overcurrent protection warning device Download PDFInfo
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- CN204464961U CN204464961U CN201520222849.3U CN201520222849U CN204464961U CN 204464961 U CN204464961 U CN 204464961U CN 201520222849 U CN201520222849 U CN 201520222849U CN 204464961 U CN204464961 U CN 204464961U
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Abstract
Motor overcurrent protection warning device, belongs to Motor Control Field, and the utility model is solve the problem that existing motor overcurrent protective circuit exists misoperation.The utility model comprises three-phase breaker QS1, A.C. contactor KM, three-phase thermal relay FR, excessive current detection unit, overcurrent performance element and alarm unit; 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; Excessive current detection unit gathers a certain circuitry phase whether overcurrent of three phase electric machine M; Overcurrent performance element provides power supply by the circuit between KM-1 and QS1; Alarm unit provides power supply by the circuit between KM-1 and QS1; After excessive current detection unit detects overcurrent signal, drive overcurrent performance element to disconnect KM-1, and then cut off the power supply of three phase electric machine M, drive alarm unit to report to the police simultaneously.
Description
Technical field
The utility model relates to a kind of protective circuit of motor, belongs to Motor Control Field.
Background technology
Motor plays important effect in economical production, and it, as other electric equipments, works under rated current, carries out protection seem very important to it.Carrying out overcurrent protection to motor is that overcurrent refers to that motor or electric elements exceed the running status of its rated current, and overcurrent is generally little than short circuit current, within 6 times of rated current at present to protection modal in electric motor protecting.The possibility that overcurrent occurs in electric wiring is greater than short circuit, particularly when motor Fraquent start and frequent rotating.Under overcurrent situations, if can recover normal by current value before reaching maximum permission temperature rise, electric elements still can normally work, but the impulse current that overcurrent causes can damage motor, the large torque of the transient electromagnetic produced can damage mechanical transmission component, therefore will cut off the electricity supply in time.Overcurrent protection is commonly used overcurrent relay and is realized.By overcurrent relay coil tandem in protected circuit; when electric current reaches its setting value; overcurrent relay action; its normally closed interlock is serially connected in the branch road at contactor coil place; make contactor coil power-off; disconnected by the main contact of contactor in main circuit again, motor power is cut off in time.
The scheme of current protection is very different, and many objective factors also affect the accuracy of overcurrent protection.Such as, be in overcurrent condition when the motor is energized, conventional overcurrent protective device easily causes misoperation.
Summary of the invention
The utility model object is the problem that there is misoperation in order to solve existing motor overcurrent protective circuit, provides a kind of motor overcurrent protection warning device.
Motor overcurrent protection warning device described in the utility model, it comprises three-phase breaker QS1, A.C. contactor KM, three-phase thermal relay FR, excessive current detection unit, overcurrent performance element and alarm unit;
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;
Excessive current detection unit gathers a certain circuitry phase whether overcurrent of three phase electric machine M;
Overcurrent performance element provides power supply by the circuit often opened between three-phase main contacts KM-1 and three-phase breaker QS1 of A.C. contactor KM;
Alarm unit provides power supply by the circuit often opened between three-phase main contacts KM-1 and three-phase breaker QS1 of A.C. contactor KM;
After excessive current detection unit detects overcurrent signal, driving overcurrent performance element disconnection A.C. contactor KM often opens main contacts KM-1, and then cuts off the power supply of three phase electric machine M, drives alarm unit to report to the police simultaneously.
Advantage of the present utility model: motor overcurrent protection warning device structure described in the utility model is simple, adopts several discrete components to realize control, the good stability of integrated circuit.When motor just starts, do not start excess current protective function, time delay a period of time, start excess current protective function when circuit stability, when avoiding starting shooting during overcurrent, the misoperation of overcurrent protection, the accuracy making it control overcurrent protection action is higher.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of motor overcurrent described in the utility model protection warning device.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, motor overcurrent protection warning device described in present embodiment, it comprises three-phase breaker QS1, A.C. contactor KM, three-phase thermal relay FR, excessive current detection unit, overcurrent performance element and alarm unit;
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;
Excessive current detection unit gathers a certain circuitry phase whether overcurrent of three phase electric machine M;
Overcurrent performance element provides power supply by the circuit often opened between three-phase main contacts KM-1 and three-phase breaker QS1 of A.C. contactor KM;
Alarm unit provides power supply by the circuit often opened between three-phase main contacts KM-1 and three-phase breaker QS1 of A.C. contactor KM;
After excessive current detection unit detects overcurrent signal, driving overcurrent performance element disconnection A.C. contactor KM often opens main contacts KM-1, and then cuts off the power supply of three phase electric machine M, drives alarm unit to report to the police simultaneously.
Embodiment two: present embodiment is described further execution mode one, excessive current detection unit comprises current transformer TA, current relay KI and time relay KT; Current transformer TA detects a certain phase current signal of three phase electric machine M, one end of connect hours relay K T normally-closed contact KT-1 and one end of time relay KT normally opened contact KT-2 simultaneously, one end of current transformer TA coil; The other end of time relay KT normally-closed contact KT-1 connects the other end of current transformer TA coil, one end of current relay KI coil and earth connection PE simultaneously; The other end of the other end connect hours relay K T normally opened contact KT-2 of current relay KI coil;
Overcurrent performance element comprises single-phase circuit breaker QS2, stop button SB1, stop button SB3, start button SB2, auxiliary relay KA, indicator light HL1, indicator light HL2 and indicator light HL3;
Stop button SB1 and stop button SB3 is linked switch;
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 KA normally opened contact KA-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 auxiliary relay KA normally-closed contact KA-1 simultaneously, the other end of auxiliary relay KA normally-closed contact KA-1 connects one end of A.C. contactor KM coil and one end of time relay KT coil simultaneously, the other end and the other end of time relay KT coil of A.C. contactor KM coil are connected one end of three-phase thermal relay FR normally closed auxiliary contact simultaneously,
The other end of stop button SB3 connects one end of current relay KI normally opened contact and one end of auxiliary relay KA normally opened contact KA-2 simultaneously, and the other end and the other end of auxiliary relay KA normally opened contact KA-2 of current relay KI normally opened contact are connected one end of auxiliary relay KA 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 KA normally opened contact KA-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 KA 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.
Operation principle:
The QS1 that closes is that whole device work is ready, and the QS2 that closes is that overcurrent detection is ready, and press the work of SB2 starter motor, after pressing SB2, KM coil obtains electric, and KM-1 closes, and motor obtains electric work, and KM-2 closes self-locking; KT coil obtains electric simultaneously, and trigger, although starting current is very large, can cause overcurrent relay KI action, but when starting in a period of time, KI coil can not obtain because of the normally opened contact of the KT that connects electric, namely can not because electric current action greatly during startup, after time delay a period of time, startup completes, and circuit is steady, then KT-2 closes, in this state, circuit is after electric current, and KI has just had the basis of work.
KM coil obtains electric, and KM-4 obtains electric, and HL2 lamp is bright, shows that motor normally runs.
When there is overcurrent after motor rotation, KI action, the normally opened contact that KI is connected in KA wire loop closes, and KA coil is obtained electric, and KA-1 disconnects, KM coil losing electricity, then KM-1 disconnects, and cut off the power supply of motor, motor quits work; Meanwhile, KM-4 disconnects, and HL2 goes out, and KM-3 recovers closed, and HL1 is bright, shows that now motor is in overcurrent fault state.
KA-2 closes self-locking simultaneously, and it is the action that KM coil power is cut off in memory that this road is arranged.
Stop if wanting during normal work, press SB1, after pressing, KM coil losing electricity, KM-1 disconnects, and motor quits work, and KM-4 goes out simultaneously, and indication motor has quit work; If after overcurrent condition occurs, because of KA coil will electric adhesive and KA-2 closes self-locking, KA-1 is in off-state, makes KM wire loop disconnect and cannot carry out start-up operation.After overcurrent fault is got rid of, startup need be carried out and operate, first must press SB1, allow KA coil losing electricity, cut off memory KA wire loop power supply, KA coil losing electricity, KA-1 recovers closed, at this moment presses SB2 again, again allow KM coil obtain electric, KM-1 closes, electric motor starting work.
HL1 is that motor stops power supply indicator of holding concurrently, and when motor stops, this lamp is bright.HL2 is motor rotation indicator light, when after dynamic turn of electric motor starting, this lamp is bright.HL3 is motor overcurrent indicator light, and after overcurrent action appears in motor, this lamp is bright.
Embodiment three: present embodiment is described further execution mode one or two, basis set circuit, resistance R1, resistance R2, electric capacity C1, electric capacity C2, loudspeaker BL and thyristor VTH when alarm unit comprises single-phase full bridge rectification circuit UR, NE555,
Two ac input ends of single-phase full bridge rectification circuit UR connect live wire L2 and live wire L3 respectively,
The cathode power supply output of single-phase full bridge rectification circuit UR simultaneously one end of contact resistance R1, resistance R2 one end, NE555 time 4 pin of basis set circuit, 8 pin and loudspeaker BL positive pole power supply terminal;
2 pin of basis set circuit when the other end of resistance R1 connects one end and the NE555 of auxiliary relay KA normally opened contact KA-4 simultaneously;
6 pin of basis set circuit and 7 pin when the other end of resistance R2 connects one end, the NE555 of electric capacity C1 simultaneously;
During NE555,5 pin of basis set circuit connect one end of electric capacity C2;
During NE555,3 pin of basis set circuit connect the control pole of thyristor VTH, and the anode of thyristor VTH connects the negative pole power supply terminal of loudspeaker BL;
The negative power supply output of single-phase full bridge rectification circuit UR connect simultaneously the other end of auxiliary relay KA normally opened contact KA-4, electric capacity C1 the other end, NE555 time 1 pin of basis set circuit, the other end of electric capacity C2 and the negative electrode of thyristor VTH, and ground connection.
Operation principle:
When motor normally runs, KA coil must not be electric, and KA-4 is in off-state, and the resistance at this place is equivalent to infinity, result then after itself and R1 dividing potential drop, the voltage that 2 pin of NE555 connect exceedes 2/3 of operating voltage, and cathode power supply is charged to C1 by resistance R2, and the operating voltage of 6 pin of NE555 is also above 2/3 of operating voltage, NE555 is in stable state, 3 pin of NE555 keep output low level, and subsequent conditioning circuit non-transformer, loudspeaker BL does not work.
When overcurrent appears in motor, KA coil obtains electric, and KA-4 closes, and 2 pin of NE555 are pulled to low level, and lower than the 3 pin output high level of 1/3, NE555 of operating voltage, trigger VTH, VTH conducting, loudspeaker BL reports to the police.Prompting staff's very first time is on site fault clearing.
Claims (3)
1. motor overcurrent protection warning device, it is characterized in that, it comprises three-phase breaker QS1, A.C. contactor KM, three-phase thermal relay FR, excessive current detection unit, overcurrent performance element and alarm unit;
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;
Excessive current detection unit gathers a certain circuitry phase whether overcurrent of three phase electric machine M;
Overcurrent performance element provides power supply by the circuit often opened between three-phase main contacts KM-1 and three-phase breaker QS1 of A.C. contactor KM;
Alarm unit provides power supply by the circuit often opened between three-phase main contacts KM-1 and three-phase breaker QS1 of A.C. contactor KM;
After excessive current detection unit detects overcurrent signal, driving overcurrent performance element disconnection A.C. contactor KM often opens main contacts KM-1, and then cuts off the power supply of three phase electric machine M, drives alarm unit to report to the police simultaneously.
2. motor overcurrent protects warning device according to claim 1, and it is characterized in that, excessive current detection unit comprises current transformer TA, current relay KI and time relay KT; Current transformer TA detects a certain phase current signal of three phase electric machine M, one end of connect hours relay K T normally-closed contact KT-1 and one end of time relay KT normally opened contact KT-2 simultaneously, one end of current transformer TA coil; The other end of time relay KT normally-closed contact KT-1 connects the other end of current transformer TA coil, one end of current relay KI coil and earth connection PE simultaneously; The other end of the other end connect hours relay K T normally opened contact KT-2 of current relay KI coil;
Overcurrent performance element comprises single-phase circuit breaker QS2, stop button SB1, stop button SB3, start button SB2, auxiliary relay KA, indicator light HL1, indicator light HL2 and indicator light HL3;
Stop button SB1 and stop button SB3 is linked switch;
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 KA normally opened contact KA-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 auxiliary relay KA normally-closed contact KA-1 simultaneously, the other end of auxiliary relay KA normally-closed contact KA-1 connects one end of A.C. contactor KM coil and one end of time relay KT coil simultaneously, the other end and the other end of time relay KT coil of A.C. contactor KM coil are connected one end of three-phase thermal relay FR normally closed auxiliary contact simultaneously,
The other end of stop button SB3 connects one end of current relay KI normally opened contact and one end of auxiliary relay KA normally opened contact KA-2 simultaneously, and the other end and the other end of auxiliary relay KA normally opened contact KA-2 of current relay KI normally opened contact are connected one end of auxiliary relay KA 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 KA normally opened contact KA-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 KA 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.
3. motor overcurrent protection warning device according to claim 1, is characterized in that, basis set circuit, resistance R1, resistance R2, electric capacity C1, electric capacity C2, loudspeaker BL and thyristor VTH when alarm unit comprises single-phase full bridge rectification circuit UR, NE555,
Two ac input ends of single-phase full bridge rectification circuit UR connect live wire L2 and live wire L3 respectively,
The cathode power supply output of single-phase full bridge rectification circuit UR simultaneously one end of contact resistance R1, resistance R2 one end, NE555 time 4 pin of basis set circuit, 8 pin and loudspeaker BL positive pole power supply terminal;
2 pin of basis set circuit when the other end of resistance R1 connects one end and the NE555 of auxiliary relay KA normally opened contact KA-4 simultaneously;
6 pin of basis set circuit and 7 pin when the other end of resistance R2 connects one end, the NE555 of electric capacity C1 simultaneously;
During NE555,5 pin of basis set circuit connect one end of electric capacity C2;
During NE555,3 pin of basis set circuit connect the control pole of thyristor VTH, and the anode of thyristor VTH connects the negative pole power supply terminal of loudspeaker BL;
The negative power supply output of single-phase full bridge rectification circuit UR connect simultaneously the other end of auxiliary relay KA normally opened contact KA-4, electric capacity C1 the other end, NE555 time 1 pin of basis set circuit, the other end of electric capacity C2 and the negative electrode of thyristor VTH, and ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520222849.3U CN204464961U (en) | 2015-04-14 | 2015-04-14 | Motor overcurrent protection warning device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520222849.3U CN204464961U (en) | 2015-04-14 | 2015-04-14 | Motor overcurrent protection warning device |
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| CN204464961U true CN204464961U (en) | 2015-07-08 |
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| CN201520222849.3U Expired - Fee Related CN204464961U (en) | 2015-04-14 | 2015-04-14 | Motor overcurrent protection warning device |
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Cited By (5)
| 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 |
| CN106451430A (en) * | 2016-10-31 | 2017-02-22 | 国家电网公司 | Safe power supply control circuit of each unit load of verification production line |
| CN106602498A (en) * | 2017-03-06 | 2017-04-26 | 浙江中凯科技股份有限公司 | Method and apparatus for setting low-voltage electric appliance rated parameters |
| CN106648020A (en) * | 2017-01-05 | 2017-05-10 | 郑州云海信息技术有限公司 | Method and apparatus for preventing over-current protection malfunction |
| CN106671831A (en) * | 2017-03-07 | 2017-05-17 | 中铁十七局集团电气化工程有限公司 | Device for monitoring charged state of overhead contact line |
-
2015
- 2015-04-14 CN CN201520222849.3U patent/CN204464961U/en not_active Expired - Fee Related
Cited By (6)
| 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 |
| CN106451430A (en) * | 2016-10-31 | 2017-02-22 | 国家电网公司 | Safe power supply control circuit of each unit load of verification production line |
| CN106648020A (en) * | 2017-01-05 | 2017-05-10 | 郑州云海信息技术有限公司 | Method and apparatus for preventing over-current protection malfunction |
| CN106602498A (en) * | 2017-03-06 | 2017-04-26 | 浙江中凯科技股份有限公司 | Method and apparatus for setting low-voltage electric appliance rated parameters |
| CN106671831A (en) * | 2017-03-07 | 2017-05-17 | 中铁十七局集团电气化工程有限公司 | Device for monitoring charged state of overhead contact line |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150708 Termination date: 20190414 |