CN2292342Y - Multifunctional motor protector - Google Patents
Multifunctional motor protector Download PDFInfo
- Publication number
- CN2292342Y CN2292342Y CN 97202799 CN97202799U CN2292342Y CN 2292342 Y CN2292342 Y CN 2292342Y CN 97202799 CN97202799 CN 97202799 CN 97202799 U CN97202799 U CN 97202799U CN 2292342 Y CN2292342 Y CN 2292342Y
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- 230000001012 protector Effects 0.000 title abstract description 10
- 230000004224 protection Effects 0.000 claims abstract description 27
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 4
- 230000000712 assembly Effects 0.000 claims description 2
- 238000000429 assembly Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000006870 function Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004821 Contact adhesive Substances 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Abstract
A multifunctional protector for motor is composed of casing, multiple indicating lamps, regulating knob, connecting terminals and control circuit in casing, and features that said control circuit is serially connected to the coil loop of AC contactor of the controlled motor start control circuit via one of the normally open contacts of relay. The protector is suitable for motor control circuits in various modes, can realize multi-functional protection of phase failure, overload, electric leakage, short circuit, locked rotor and the like, can accurately indicate fault types, is convenient to maintain, and works sensitively and reliably. The device fundamentally changes the design defect of current product, can really play the guard action of guarantee motor safe operation.
Description
The utility model relates to a kind of electric motor protective device, particularly relates to a kind of relay normally open contact that utilizes and discharges the multi-functional electric motor protecting device of realizing protection.
Now the motor protecter on the market is of a great variety, performance is different, but a common ground is arranged, and promptly all is the protection that utilizes normally-closed contact to move to realize motor." the electric world " magazine the 5th phase of nineteen ninety-five article " discussion of threephase asynchronous resist technology " should meet 7 standard requirements during all kinds of motor protecter of suggestion design, and wherein the 3rd is: " utilizing the normally-closed contact action of protector to realize protection ".Yet the method that this quilt is generally approved and generally used in its product has made motor protecter enter into mistaken ideas.Its main disadvantage is: in case when the power interruptions of protector or its components and parts break down, just lose defencive function fully; But in normally-closed contact access control circuit, the motor starting operation that still can do as usual burns until hindering for some reason.
Secondly, aspect defencive function, also there is very big limitation in existing product, and outstanding behaviours is insensitive, unreliable to open phase protection.Representative a kind of product has following explanation: 100%Ie (rated current), phase shortage operate time＜2S to open phase protection; 60%Ie, phase shortage operate time＜4S; 40%Ie, phase shortage operate time＜20S; 30%Ie, the phase failure is failure to actuate.Traditional theory is thought: running current increases after the motor phase failure, and overrate can cause burn-down of electric motor, and motor is underloading or zero load during as the phase failure, and current of electric is overrate not, and motor can not burn.True really not so, one has the people of long-term practice experience all can know, motor phase shortage when no-load running also can be damaged; Its two, the relevant expert carried out the phase-deficient operation experiment specially to the motor of no-load running, although phase shortage after-current overrate not, motor still damages.After testing with dissect conclusion and be: the motor phase-deficient operation, not only burn because of electric current increases, can produce too high back-emf after the phase shortage, winding inter-turn punctured and damage.And a kind of damage in back, winding is not heating at all.
" the electric world " magazine nineteen ninety-five the 8th periodical literary composition " motor protector summary " proposes, and the multi-functional electric motor protecting device is unreliable to open phase protection, and it is reliable to open phase protection to have temperature sensing formula protector only.
Moreover according to putting into practice needs, the function that the multi-functional electric motor protecting device possesses indication and memory fault is very necessary.It can shorten the time of fixing a breakdown, resuming operation greatly.Yet existing product scarcely possesses this function; Though the product that has has indication, extinguish along with the tripping operation power down of protector, make this indication meaningless.
According to statistics, burn motor and reach more than 200,000 times national every year, and 1,600,000,000 yuan of direct economic losses, indirect loss reach 10,000,000,000 yuan.Yet; existing motor protecter with normally-closed contact access control circuit is again because of limitation in its design and unreliable (will lean on the relay adhesive to break normally-closed contact and could realize defencive function) in the work; users are had no confidence to it, and numerous and confused the dismounting discarded.Even protector has been installed, can not the adhesive fault if its relay takes place, motor will be in the unprotect running status under operating personnel have no the situation of discovering, can burn motor because of various faults in the same old way.
The purpose of this utility model provides a kind of normally opened contact that utilizes and is connected to multi-functional electric motor protecting device in the ac contactor coil loop in the controlled motor start control circuit; this device can fundamentally change the design defect of existing product, really plays the effect of protecting motor and maintaining easily repairing.
The utility model is achieved in that and includes casing, is installed in a plurality of indicator lights on the casing, adjust the control circuit in knob, binding post and the casing, it is characterized in that: above-mentioned control circuit is to be serially connected on the wire loop of A.C. contactor of controlled motor start control circuit by one of them relay normally open contact.
Above-mentioned control circuit includes power indicating circuit, overload protection and indicating circuit, underloading indication and adjusts circuit, earth leakage protective and indicating circuit, open phase protection and indicating circuit, stall, short-circuit protection circuit.
Comparator circuit and mutual inductance circuit, controllable silicon, transistor switching circuit, electric leakage instrument transformer that above-mentioned control circuit constitutes by 555 time-base circuits, with a plurality of amplifier assemblies are formed.
Maximum characteristics of the present utility model are a kind of motor protecters of new generation that change traditional design standard and idea; it goes for the circuit for controlling motor of variety of way; its mode of connection all is that the normally opened contact in its control circuit is serially connected in the ac contactor coil loop of controlled motor start control circuit; and do not change original wiring of start control circuit and mode of operation; can realize multifunction protections such as the phase failure, overload, electric leakage, short circuit, stall; accurate indication fault type; maintain easily, work is sensitive reliable.After this device inserted the machine operation circuit, as long as motor energy starting operation, it just possessed defencive function; In case it loses defencive function, motor turns round with regard to fail to start, really plays the effect that ensures the motor safety operation, is a kind of motor protecter that popularizing application prospect is quite arranged.
Fig. 1 is a profile schematic diagram of the present utility model.
Fig. 2 is the utility model control circuit electrical schematic diagram.
Fig. 3 is the winding diagram that the utility model inserts the across-the-line starting control circuit.
Fig. 4 is the winding diagram that the utility model inserts Y/ △ start control circuit.
Fig. 5 is the winding diagram that the utility model inserts the self-coupling decompression starting control circuit.
Referring to Fig. 1, Fig. 2, the utility model is to include casing 1, be installed in a plurality of indicator lights 2 on the casing 1 (Y1～Y8), adjust the control circuit in knob 3 (RY, RP), binding post 4 (KA, TC, X1～X3, LD, N) and the casing 1, above-mentioned control circuit is to be serially connected on the wire loop of A.C. contactor of controlled motor start control circuit by one of them relay K A normally opened contact.
Be example with across-the-line starting control circuit shown in Figure 3 below, introduce the operation principle of circuit structure of the present utility model, the various protections of realization and indication fault.
Referring to Fig. 2, Fig. 3, during starting button ST, D13 powers up in pressing Fig. 3, and after halfwave rectifier, dividing potential drop, filtering, high-speed switching circuit TWH8778 trigger end 5 pin power up to be opened, 2,3 pin output 12V voltage.8 pin of base NE555 IC circuit 1 when D11 is added on, making 4 pin of IC1 because of the charging of C7 is high level, and the voltage on the C8 can not suddenly change, making 2 pin is low level, so 3 pin of IC1 output high level, the charging current of C10 makes the normally opened contact adhesive of relay K A, the also adhesive of A.C. contactor KM of motor start control circuit, the motor M starting, relay indicating light V1 is bright.
After the motor M starting, signal transformer TA4～6 induce＞3 volts third harmonic voltage, be added on positive input terminal 5 pin of operational amplifier N2-2, and its negative input end 6 pin are added with 2.5 volts of comparative voltages, so 7 pin are exported high level, relay K A adhesive is kept in the BG1 conducting.Simultaneously, the fundamental voltage of TA1-3 induction is added to 6 pin of operational amplifier N1-2 behind 2 voltage multiplying rectifiers.Because of the voltage on the C5 can not suddenly change, amplifier N1-1 exports zero level, the D7 conducting, and delayed lamp V2 is bright.The conducting of D7 makes the too high signal voltage of electric motor starting time that is added on 6 pin be clamped at 0.7V, and its positive input terminal 5 pin are added with about 10V reference voltage of adjusting through potentiometer RP, so 7 pin output high level.Add to the about 5V voltage of 12 pin of amplifier N1-4 through D8, R13, and its 13 pin voltage is 1.3V, so 14 pin output high level, 4 pin through R17 adds to IC1 make its 3 pin keep the output high level.After the C5 charging finished, the 3 pin voltages of N1-1 rose to 12V, 1 pin output high level, and delayed lamp V2 goes out, and D7 is blocked and ends; The 6 pin voltages of N1-2 change with the variation of motor operating current.So far, motor M promptly is being subjected to normally operation under the utility model guard mode.When signal voltage interrupts, 8 pin of N1-3 output zero level, the D9 conducting, to 0.7V, 14 pin are also exported zero level the 12 pin clamps of amplifier N1-4, and 3 pin that make IC1 are output low level also, and the KA normally opened contact discharges, and can prevent that motor from moving under the unprotect state.
The circuit working principle of various protections of following division and indication fault.
(1) phase failure is meant that the A.C. contactor main contact is to broken string or loose contact between the motor lead-out wire down, when this fault takes place, the TA4-6 third harmonic voltage should be zero, even residual voltage (it is following to be generally 0.8V) is arranged, because of 6 pin of amplifier N2-2 are added with 2.5 volts of comparative voltages, make its 7 pin output zero level when the phase failure down takes place, transistor BG1 carries and ends, relay K A discharges, and cuts off motor power.Following open phase fault indicator light is V6, and indicating circuit is made up of transistor BG2, BG3 and controllable silicon VS2 etc.During operate as normal, the BG1 conducting, its emitter voltage is added to the BG2 base stage, makes the BG2 conducting, and voltage-stabiliser tube DW4 negative terminal voltage is low, does not puncture, so carrying, ends BG3, controllable silicon VS2 triggerless voltage, V6 does not work.During the following phase failure, BG1 carries and ends, and BG2 also carries and ends, and make the BG3 conducting, and the VS2 conducting makes V6 bright, the indication phase failure down.
(2) go up the phase failure and be meant the mains side phase failure, comprise A.C. contactor main contact upper end to the power transformer low-pressure side, and the high-pressure side phase failure of Y/Y, △/delta connection.It is zero that one line current is arranged after the phase failure, and the third harmonic voltage that makes the TA4-6 induction is zero, and its protection philosophy is with the phase failure down.Its indicator light is V5, and the Y point resultant voltage of resistance R 47-R49 is non-vanishing during the last phase failure, to ground, lights V5 through D19 rectification, R46, R23.Simultaneously, this electric current injects the BG2 base stage, makes BG2 keep conducting when the last phase failure, and BG3 ends, so phase failure lamp V6 does not work down.
(3) overload protection: the utility model is applicable to the low-voltage three phase asynchronous motor of various capacity, for guaranteeing the sensitivity of overload protection, for the motor of different capabilities, will do during use once and simply adjust.
Before the actuating motor, earlier potentiometer RP is transferred to the end clockwise, makes 5 pin of N1-2 that 10V left and right sides reference voltage be arranged.Behind the electric motor starting, V3 is bright for the underloading indicator light, and when treating the motor oepration at full load, inhour is adjusted potentiometer RP again, V3 has just been gone out till.Use does not later on need to adjust again.Its principle is as follows: underloading lamp V3 is connected on 8 pin of N2-3, its 9 pin plus signal voltage, by the variation of TA1-3 decision, this signal voltage≤7V when motor normally moves, and the 10 pin voltages of N2-3 be N1-1 and N1-2 2,5 pin reference voltages 3/4.After above-mentioned adjustment, make the reference voltage of 5 pin of N1-2 bigger by about 1/3 than the 6 pin signal voltages of N1-2, in the time of can guaranteeing the normal load carrying of motor like this, electric current leaves certain allowance, and unlikely have overload slightly with regard to trip protection.During motor overload, the TA1-3 induced voltage raises, and when the 6 pin voltages of N1-2 during greater than its 5 pin voltage, its 7 pin output zero level, 3 pin of N2-1 also be zero level simultaneously, its 1 pin output zero level, and the lamp V4 that transships is bright.As overload time＜20S, 7 pin of N1-2 are exported high level again, and 1 pin of N2-1 is also exported high level, and overload lamp V4 extinguishes.Surpass 20S when the overload time, the C6 discharge off, 14 pin of N1-4 promptly overturn and are zero level, and the 4 pin voltages that make IC1 are zero, the output of 3 pin zero levels, relay K A discharges, and cuts off motor power, and overload lamp V4 continues to light, the indication overload.
Overload protection not only to motor load increase the weight of protect, also faults such as the power transformer high-pressure side phase failure of Y/ delta connection, delta connection motor interior broken string, the public bus of multiple electric motors be disconnected are protected.The line current of this class fault is all non-vanishing, thus can not realize open phase protection, but have a line current to increase to more than 2 times of rated current, realize overload protection.Because the utility model detects the three-phase operation electric current, arbitrary phase current increases all can realize overload protection.
(4) when motor rotation blockage, short circuit take place; the TA1-3 induced voltage sharply raises; this voltage adds to N2-4 positive input terminal 12 pin; when about 9V voltage that it surpasses that negative input end 13 pin preset; its 14 pin output high level makes the 13 pin voltages of N1-4 be higher than 12 pin voltages, and its 14 pin is turned into zero level; make 3 pin of IC1 also realize being turned into zero level, relay K A discharges and realizes protection.
(5) earth leakage protective: three power lines of motor pass electric leakage instrument transformer LD, and when normally moving, the three-phase resultant current is zero, non-inductive voltage among the LD.When motor Ground leakage current 〉=100ma, the voltage triggered controllable silicon VS3 conducting of responding among the LD, V7 is bright for the electric leakage indicator light, and the voltage of R53 will be greater than 8V, and adds to 6 pin of IC1, because of its 2 pin voltage＞4 volts, makes 3 pin be turned into zero level, the protector trip protection.
In a word, the utlity model has very strong self check and Presentation Function, and extensive applicability is arranged, Fig. 4, Fig. 5 have showed the wiring that is applied in other two kinds of start control circuits, can effectively ensure the safe operation of motor.
The utility model is some of advanced developments, through the practice test, have realized goal of the invention, are a kind of multi-functional electric motor protecting devices that has much popularizing application prospect.
Claims (3)
1, a kind of multi-functional electric motor protecting device; include casing, be installed in a plurality of indicator lights on the casing; adjust the control circuit in knob, binding post and the casing, it is characterized in that: above-mentioned control circuit is to be serially connected on the wire loop of A.C. contactor of controlled motor start control circuit by one of them relay normally open contact.
2, multi-functional electric motor protecting device as claimed in claim 1 is characterized in that: above-mentioned control circuit includes power indicating circuit, overload protection and indicating circuit, underloading indication and adjusts circuit, earth leakage protective and indicating circuit, open phase protection and indicating circuit, stall, short-circuit protection circuit.
3, multi-functional electric motor protecting device as claimed in claim 1 is characterized in that: comparator circuit and mutual inductance circuit, controllable silicon, transistor switching circuit, electric leakage instrument transformer that above-mentioned control circuit constitutes by 555 time-base circuits, with a plurality of amplifier assemblies are formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97202799 CN2292342Y (en) | 1997-03-28 | 1997-03-28 | Multifunctional motor protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97202799 CN2292342Y (en) | 1997-03-28 | 1997-03-28 | Multifunctional motor protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2292342Y true CN2292342Y (en) | 1998-09-23 |
Family
ID=33923854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97202799 Expired - Fee Related CN2292342Y (en) | 1997-03-28 | 1997-03-28 | Multifunctional motor protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2292342Y (en) |
-
1997
- 1997-03-28 CN CN 97202799 patent/CN2292342Y/en not_active Expired - Fee Related
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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 |