CN201160220Y - Passive thread type motor protecting equipment - Google Patents
Passive thread type motor protecting equipment Download PDFInfo
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- CN201160220Y CN201160220Y CNU2008200003989U CN200820000398U CN201160220Y CN 201160220 Y CN201160220 Y CN 201160220Y CN U2008200003989 U CNU2008200003989 U CN U2008200003989U CN 200820000398 U CN200820000398 U CN 200820000398U CN 201160220 Y CN201160220 Y CN 201160220Y
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- 230000001681 protective effect Effects 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 claims description 2
- 238000005070 sampling Methods 0.000 abstract 2
- 230000001012 protector Effects 0.000 description 7
- 238000009434 installation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
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Abstract
The utility model relates to an inactive threading type motor protecting device, which is provided with a switch control circuit connected with a sensing sampling circuit, the output end of the switch control circuit is connected with a switch driving circuit. The inactive threading type motor protecting device is characterized in that: the sensing sampling circuit is provided with a current transformer that can obtain three-phase current signals respectively, the output end of the three-phase current transformer is respectively connected with the input end of the switch control circuit, another branch circuit of the output end of the three-phase current transformer is respectively connected with the electric supply end of the switch control circuit through a rectifier circuit. The switch control circuit does not need to be connected externally power supply, so as to simplify external connection wires of the motor protecting device and also improve safety of the device.
Description
Technical field
The utility model belongs to a kind of electric protective device, is specifically related to the overload of loss of phase protective device of a kind of motor or circuit and other electric equipment.
Background technology
Motor is in actual motion, if abnormal situation appears in machinery or circuit abnormality makes motor run into overload, the electric current in then motor speed decline, the winding will increase, and the winding temperature of motor is raise.If overload time is long, overload current is big, can shorten the useful life of motor, when serious motor windings is burnt.So, all motor protecter to be installed usually.
Thermal relay is most representative electric motor protective device; it utilizes the thermal effect principle of electric current; when overcurrent heating situation appears in motor; circuit is cut off in electric heating element heating distortion; play the effect of overload protection, its weak point is that the thermal relay action is slower; sensitivity is reliable inadequately, the situation of malfunction and tripping occurs through regular meeting.Therefore a lot of electronic type electric motor protectors appear now, it is directly to insert motor main circuit that this class protector has a kind of, its weak point is not isolate on electric between protector and the motor, there is personal safety hidden danger, a class is the secondary circuit of access motor in addition, this class protector normally is provided with the sensing sample circuit, the sensing sample circuit is connected with ON-OFF control circuit, ON-OFF control circuit produces switch controlling signal according to the sensing sampled signal of input, and be connected with switch control element in being connected on the motor secondary control loop by switch driving circuit, return the break-make of switch element in the switch control element control motor main circuit in the control loop by the motor secondary; The ON-OFF control circuit of existing this electron-like formula motor protecter all needs external working power, and has protector wiring complexity, the deficiency of installation and maintenance inconvenience.
Summary of the invention
The technical problems to be solved in the utility model provides the electric motor protective device that a kind of ON-OFF control circuit does not need external power supply.
The problem that the utility model further will solve provides the simple electric motor protective device of a kind of installation wiring.
The technical scheme that addresses the above problem is: the utility model is provided with the ON-OFF control circuit that is connected with the sensing sample circuit, the ON-OFF control circuit output is connected with switch driving circuit, it is characterized in that: described sensing sample circuit is provided with the current transformer that can obtain the motor three-phase current signal respectively, the threephase current transformer output connects the ON-OFF control circuit input respectively, and another branch circuit of threephase current transformer output is connected with the feeder ear of ON-OFF control circuit by rectification circuit respectively.
Further scheme is: this device is provided with two outputs that can be connected in series with the motor secondary control loop, these two ends are connected with the bridge rectifier input, described switch driving circuit is the reverse-blocking tetrode thyristor drive circuit, the bridge rectifier output is connected with the thyristor switch driving circuit, and described ON-OFF control circuit output is connected with the SCR control polar circuit.
Operation principle of the present utility model is: during machine operation; threephase current transformer produces induced voltage respectively; after the rectifier power source rectification, provide working power for ON-OFF control circuit; simultaneously current transformer is input to ON-OFF control circuit with the three-phase current signal that obtains respectively, and when the phase failure takes place, or electric current is when surpassing set point; ON-OFF control circuit output control signal; make switch driving circuit turn-off motor main circuit, motor quits work, and plays the overload of loss of phase protective effect.
The using method of the further scheme of the utility model is: two outputs of this device are connected in the motor secondary control loop that is connected to the switch control assembly; the AC power of motor secondary circuit is the reverse-blocking tetrode thyristor drive circuitry by the bridge rectifier of this device; when controllable silicon under ON-OFF control circuit control during conducting; switch control element conducting in the motor secondary circuit; when controllable silicon turn-offs under ON-OFF control circuit control; promptly close the switch control element in the power machine secondary circuit; make the motor main circuit outage, the foregoing circuit structure makes this electric motor protective device that two external binding posts only need be set.
The current transformer that the utility model adopts does not need have wiring to be connected with external circuitry; can produce voltage by induction and provide transducing signal for ON-OFF control circuit; the induced voltage of D.C mutual-inductor generation simultaneously is the ON-OFF control circuit power supply by rectification circuit again; make ON-OFF control circuit not need to be connected with external power supply; thereby simplified the external line of electric motor protective device, and the fail safe that can improve device.
The further scheme of the utility model has, and terminals simple in structure, need be external are few, are convenient to the advantage of on-the-spot installation and maintenance.
Description of drawings
Fig. 1, the utility model block diagram
Fig. 2, the utility model embodiment block diagram
Fig. 3, the utility model embodiment circuit diagram
Fig. 4, the utility model embodiment product appearance structural representation
Fig. 5, the utility model embodiment switch control Driver Circuit are serially connected in the circuit diagram in the motor secondary control loop
Embodiment
Current transformer is the core-theaded type current transformer of annular core, referring to Fig. 4, axial through bore 2 is arranged on the box body upper and lower panel 1, during installation, the motor main circuit three-phase conducting wire is passed three perforation respectively, mutual inductor coil on annular core can produce induced voltage, and the maximum effectively threading aperture of this example reaches 30mm, can pass the lead in 185mm2 cross section.Adopt annular core, can reduce the influence of big electric current and surrounding magnetic field,, have very strong stability especially for big current circuit.And the core-theaded type current transformer, need not external line, isolate fully with major loop, solved the problem of main circuit terminal heating, significantly improved reliability and anti-interference, improved adaptability to line voltage.What this routine current transformer adopted is quick saturable core, can satisfy high power motor long requirement start-up time.
ON-OFF control circuit adopts the LM339N comparator circuit.
Three core-theaded type current mutual inductor coil TA, TB, TC one end ground connection, the other end divides two-way, one the tunnel is connected with ON-OFF control circuit comparator comparison signal input 11 pin, 5 pin, 7 pin by diode D3, D4, D5 respectively, and another road connects ON-OFF control circuit comparator feeder ear 9 pin by rectifier diode D1, D2, D6 and current-limiting resistance R12 respectively.
Rectifier diode D1, D2, D6 output also connect comparator reference voltage-regulation pin 8 pin by adjustable resistor R13, R3, are used to regulate the reference voltage level of comparative voltage, thereby set overload current limit value, the protection value of regulating motor protector.
The ON-OFF control circuit input is connected to the integrating circuit of being made up of resistance R 13 and capacitor C 5, C6; play time-lag action; this routine delay circuit is connected on comparator input terminal 8 pin; when electric current is big so that overload; can send the shutoff control signal in the short period of time; at the overload electric current hour, in the long time, send cut-off signals, make this protector have the inverse time-lag function.
Comparator switch control signal output ends 13 pin and grounding leg two termination switch driving circuit inputs.
Usually, the output of comparator 13 pin is high level, when the overload phenomenon appears in motor three-phase major loop, comparator comparison signal input 11 pin, 5 pin, the corresponding pin input voltage of 7 pin surpass reference voltage level, output 13 pin are output low level, when the three-phase major loop generation phase failure, output 13 human hair combing wastes are given birth to upset, output low level.
Switch driving circuit is made up of thyristor Q3; its yin, yang the two poles of the earth are connected with the bridge rectifier output of being made up of D6, D7, D13, D14 respectively; the input of two these bridge rectifiers of wiring termination that this motor protective circuit and motor secondary control loop are connected in series is connected in the motor secondary control loop reverse-blocking tetrode thyristor drive circuit.
The SCR control polar circuit is: second switch triode Q2 is connected in parallel between the thyristor control utmost point and the negative electrode ground, its collector electrode connects the thyristor anode by resistance R 25, R16, the first switch triode Q1 is connected in parallel between second switch triode Q2 base stage and the ground, its base stage connects second switch triode Q2 collector electrode by resistance R 26, and the first switch triode Q1 collector electrode and second switch triode Q2 base stage connect thyristor Q3 anode by resistance R 24, R15.Aforementioned switches control circuit comparator output terminal 13 pin are connected with ground with the base stage of the first switch triode Q1 respectively with grounding leg.
Referring to Fig. 4, Fig. 5, the motor main circuit three-phase conducting wire is passed on this device box body 1 three perforation 3 respectively, two outputs 3 of this device are serially connected in the motor secondary control loop, at this moment, the AC power of motor secondary circuit is added to thyristor Q3 two ends through the bridge rectifier rectification, motor is under normal operation, comparator output high level, the first switch triode Q1 conducting in the switch driving circuit, second switch triode Q2 ends, thyristor Q3 conducting makes relay (or contactor) the coil C conducting that is connected in the motor secondary control loop, is connected on the contact C1 in the motor main circuit, C2, the C3 conducting; When overload or phase failure situation take place in motor, the comparator output low level, the first switch triode Q1 ends, resistance R 24, R15 make its conducting for second switch triode Q2 base stage provides bias current, with thyristor Q3 control utmost point ground connection, thyristor Q3 ends, make relay (or contactor) the coil C outage that is connected in the motor secondary control loop, disconnect contact C1, C2, C3 in the motor main circuit, motor quits work.
When above-mentioned thyristor Q3 by the time, though R16, R25, the also conducting of Q1 branch road, because of as control utmost point resistance in circuit R16, R25 resistance resistance, so deficiency is so that coil C conducting much larger than relay coil C.
The on-off controller part of this device does not need external power supply, can significantly reduce the loaded down with trivial details work of field connection, and is easy for installation, succinct.
The above; it only is preferred embodiment of the present utility model; be not that the utility model is done any pro forma restriction; every foundation technical spirit of the present utility model all still belongs to the protection range of technical solutions of the utility model to any simple modification, equivalent variations and modification that above embodiment did.
Claims (7)
1, a kind of passive threading type electric motor protective device; be provided with the ON-OFF control circuit that is connected with the sensing sample circuit; the ON-OFF control circuit output is connected with switch driving circuit; it is characterized in that: described sensing sample circuit is provided with the current transformer that can obtain the motor three-phase current signal respectively; the threephase current transformer output connects the ON-OFF control circuit input respectively, and another branch circuit of threephase current transformer output is connected with the feeder ear of ON-OFF control circuit by rectification circuit respectively.
2, passive threading type electric motor protective device according to claim 1; it is characterized in that: described current transformer is the core-theaded type current transformer of annular core; core-theaded type current mutual inductor coil TA, TB, TC one end ground connection; the other end divides two-way; one the tunnel is connected with the ON-OFF control circuit input by diode respectively, and another road connects the ON-OFF control circuit feeder ear by rectifier diode and current-limiting resistance respectively.
3, passive threading type electric motor protective device according to claim 2, it is characterized in that: described ON-OFF control circuit is a comparator circuit.
4, passive threading type electric motor protective device according to claim 3; it is characterized in that: described comparator reference voltage-regulation pin is connected with described current transformer rectification circuit output end by adjustable resistance, is used to regulate the reference voltage level of comparative voltage.
5, passive threading type electric motor protective device according to claim 1, it is characterized in that: described ON-OFF control circuit input is connected to the delay circuit of being made up of resistance R 13 and capacitor C 5, C6.
6, according to the described passive threading type electric motor protective device of the arbitrary claim of claim 1-5; it is characterized in that: this device is provided with two outputs that can be connected in series with the motor secondary control loop; these two ends are connected with the bridge rectifier input; described switch driving circuit is the reverse-blocking tetrode thyristor drive circuit; the bridge rectifier output is connected with the thyristor switch driving circuit, and described ON-OFF control circuit output is connected with the SCR control polar circuit.
7; passive threading type electric motor protective device according to claim 6; it is characterized in that: described SCR control polar circuit is: second switch triode Q2 is connected in parallel between the thyristor control utmost point and the negative electrode ground; its collector electrode is by resistance R 25; R16 connects the thyristor anode; the first switch triode Q1 is connected in parallel between second switch triode Q2 base stage and the ground; its base stage connects second switch triode Q2 collector electrode by resistance R 26; the first switch triode Q1 collector electrode and second switch triode Q2 base stage are by resistance R 24; R15 connects thyristor Q3 anode, and described ON-OFF control circuit comparator output terminal is connected with ground with the base stage of the first switch triode Q1 respectively with grounding leg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200003989U CN201160220Y (en) | 2008-01-08 | 2008-01-08 | Passive thread type motor protecting equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200003989U CN201160220Y (en) | 2008-01-08 | 2008-01-08 | Passive thread type motor protecting equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201160220Y true CN201160220Y (en) | 2008-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200003989U Expired - Fee Related CN201160220Y (en) | 2008-01-08 | 2008-01-08 | Passive thread type motor protecting equipment |
Country Status (1)
| Country | Link |
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| CN (1) | CN201160220Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102214908A (en) * | 2011-05-09 | 2011-10-12 | 中国振华集团群英无线电器材厂 | Overcurrent protection relay of three-phase source |
-
2008
- 2008-01-08 CN CNU2008200003989U patent/CN201160220Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102214908A (en) * | 2011-05-09 | 2011-10-12 | 中国振华集团群英无线电器材厂 | Overcurrent protection relay of three-phase source |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081203 Termination date: 20110108 |