CN2107727U - Multi-function electronic motor protector - Google Patents
Multi-function electronic motor protector Download PDFInfo
- Publication number
- CN2107727U CN2107727U CN 91232969 CN91232969U CN2107727U CN 2107727 U CN2107727 U CN 2107727U CN 91232969 CN91232969 CN 91232969 CN 91232969 U CN91232969 U CN 91232969U CN 2107727 U CN2107727 U CN 2107727U
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- CN
- China
- Prior art keywords
- comparator
- point
- signal
- resistance
- communicate
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Abstract
The utility model relates to an electronic protector for a three-phase asynchronous motor. The utility model adopts the signal detection, the signal comparison and other means to provide five protections of overload, phase interruption, short circuit, blocked rotation and serious unbalance of three-phase for the motor. The utility model has the advantages of small size, good versatility and no phase sequence. The protection characteristic can not be restricted by the voltage fluctuation and the motor volume, the overload current is easy to be determined, and no matter which stage of the electric network or the power supply line has the phase interruption, the electronic protector for a three-phase asynchronous motor can make accurate protection. Besides, the electronic protector for a three-phase asynchronous motor has the functions of the failure indication and the signal display.
Description
The utility model relates to a kind of multi-functional threephase asynchronous electronic protector.
Existing various threephase asynchronous protective device all can play the certain protection effect to motor; but the function ratio that has is more single; its ratio of overload sensitivity that has is that overload operating time is all decided with motor start-up process length; on the overload control precision; all can't reach result of use, tracing it to its cause is that they will be by debugging to determine the overload critical value.Must adopt normal voltage and rated current again; just can determine the overload critical value patent No. is that 88200399.2 " phase asynchronous conduction motivation nine function and protecting devices " its volume is big, do not have versatility, and the big electric current of primary side directly passes through protector; burn loop member easily, cost is also high.Number of patent application is that 90103753.2 " motor protectors " are by the electric current in monitoring motor three phase windings; as long as a certain phase current is zero; just be judged to be the phase failure; the protector action; yet under some malfunction, as the high-pressure side net phase failure that happens occasionally, no matter theory analysis becomes actual measurement; in the motor winding certain mutually electricity all can not be zero, therefore can't play a protective role.
The purpose of this utility model is will provide a kind of to have input and signal relatively waits the multifunctional motor electronic protector, and can overcome the defective of above-mentioned protector.
The utility model is achieved in that the multifunctional motor electronic protector includes signal deteching circuit, signal criterion circuit, signal comparator circuit and actuator.Signal deteching circuit is by current transformer CT
1-3, rectifier bridge D '
1-12, filter capacitor C
1-3And diode D
1-3Form; The signal criterion circuit is by power transformer B, rectifier bridge D '
13-16, capacitor C
5, pressurizer W and resistance R hinder; Signal comparator circuit is by comparator, resistance, electric capacity, compositions such as diode and triode; Actuator then includes relay J.Three groups of current transformer CT in signal deteching circuit
1～CT
3Lotus root is closed A, B, C three-phase respectively, and its output voltage is through separately rectifier bridge D '
1～D '
12, filter capacitor C
1～C
3And diode D
1～D
3, be superimposed on a point current potential, be parallel with five groups by resistance R between a point and the ground wire
33～R
37With variable load device P
1～P
5The loaded line of series connection.The positive pole of comparator 1 passes through resistance R in comparison circuit
4And R
6Communicate with a point, negative pole directly communicates with the d point; The d point can pass through diode D
6Communicate with the positive pole of comparator 2, its negative pole passes through resistance R
4And R
9Communicate with a point, the positive pole of comparator 3 passes through R
15Communicate with the d point, negative pole then passes through diode D respectively
14～D
16Rectifier bridge D ' with separately signal deteching circuit
1～D '
12Output link to each other; Comparator 4,5 and 6 positive pole pass through resistance R
22Communicate with a point, negative pole then passes through resistance (W+R) separately
23～(W+R)
25Respectively with the rectifier bridge D ' of signal deteching circuit
1～D '
12Output communicate.Comparator 1,2 and each output of 3 all can be respectively and light-emitting diode D
17～D
19Communicate.Amplifier 1,3,4,5 and 6 each output all can pass through resistance R
20Communicate with the base stage of triode.One end of relay J is connected with pressurizer W, and the other end is connected with the collector electrode of triode.Reference signal d point current potential is by rectifier bridge D ' by power transformer B
13-14, filter capacitor C
5And pressurizer W and resistance R
11Supply with.
The utility model is described in further detail below in conjunction with embodiment and accompanying drawing thereof.
Fig. 1 is the conspectus of protector among the utility model embodiment.
Fig. 2 is connected between protector and the motor among the utility model embodiment to settle schematic diagram;
With reference to Fig. 1 and Fig. 2, a point can be obtained overload, short circuit and locked-rotor voltage signal V
a, the d point can be obtained reference voltage signal V
d(V
dSignal remains unchanged), V
aPass through R
4, R
5And by R
27～R
32The bleeder circuit of forming is again through resistance R
6And capacitor C
4The delay circuit of forming (anti-time limit characteristic) is sent into comparator 1 and reference signal V
dCompare, as when overload takes place, the high level of comparator 1 output is by diode D
8The base stage of energy trigger triode causes the relay J action, contactor C deenergization, and motor shuts down.The effect of comparator 2 heavy current impact and being provided with when avoiding electric motor starting starts large-signal V '.Through R
4And R
9Arrive the negative pole of comparator 2, with the anodal reference signal V that sets in advance
dCompare, make it is output as low level, and pass through D
4Make the just very low level of comparator 1, thus not trigger relay J action, and when starting large-signal V '.After the disappearance, comparator 2 is output as high level, and occurring overload when normally moving can protect.
The phase failure is present in two kinds of situations usually, and a kind of situation is that certain is that zero signal occurs mutually in the three-phase, and other situation of planting then is the severe three-phase imbalance, i.e. appearance peak signal and minimum signal time the in the three-phase.When one of phase failure situation appears in motor, when promptly certain phase current was zero, the output signal of its rectifier bridge was via D
14～16Formed with door, send into the negative pole of comparator 3, compare with its positive pole that has obtained reference signal.The high level of its output passes through D
9And R
20The base stage of trigger triode makes relay J move, and contactor C disconnects, the motor stall.When occurring peak signal and minimum signal simultaneously in the motor three-phase, a point is obtained peak signal V
aThrough R
22The positive pole that arrives comparator 4,5 and 6 is together respectively through (W+R)
23～25The minimum signal that reaches the negative pole of comparator 4,5 and 6 is compared, and the output high level is through D
11～13One of, and pass through R
26And R
20Can touch transistor base, make J move, contactor C disconnects, the motor stall, and after the outage of motor three-phase, because of the power supply outage as yet of signal criterion circuit, the positive pole of comparator 3 still obtains reference signal V
d, its negative pole obtains be the testing circuit rectifier bridge to be output as electric current be zero signal, comparator 3 work, output high level.Comparator 1,2 and 3 output high level can both trigger light-emitting diode D respectively
17～D
19, send corresponding indicating signals.
The utility model is owing to adopt the relatively side of grade of input and signal; function ratio is more complete; can adapt to five kinds of protections such as overload, the phase failure, short circuit, stall, severe three-phase imbalance; and its volume is little, and versatility is good, the branch of no phase sequence; protective feature is not subjected to the restriction of voltage fluctuation and motor capacity; overload current is easily determined, no matter be that electrical network or which rank of phase failure of supply line can both accurately be protected, and is provided with the automatic Presentation Function of fault indication signal.
Claims (5)
1, a kind of multifunctional motor electronic protector includes signal deteching circuit, signal criterion circuit, signal comparator circuit and actuator, it is characterized in that three groups of current transformer CT in the testing circuit
1～CT
3Be coupled respectively A, B, C three-phase, its output voltage is through separately rectifier bridge D '
1～D '
12, filter capacitor C
1～C
3And diode D
1～D
3, be superimposed on a point current potential, be parallel with five groups by resistance R between a point and the ground wire
33～R
37With variable load device P
1～P
5The loaded line of series connection passes through resistance R at the positive pole of comparator 1
4And R
6Communicate with a point, negative pole directly communicates with the d point, and the d point can pass through diode D
6Communicate with the positive pole of comparator 2, its negative pole passes through resistance R
4And R
9Communicate with a point, the positive pole of comparator 3 passes through R
15Communicate with the d point, negative pole then passes through diode D respectively
14～D
16Rectifier bridge D ' with separately signal deteching circuit
1～D '
12Output link to each other, comparator 4,5 and 6 positive pole pass through resistance R
22Communicate with a point, negative pole then passes through resistance (W+R) separately
23～(W+R)
25Respectively with the rectifier bridge D ' of signal deteching circuit
1～D '
12Output communicate.
2, multifunctional motor electronic protector according to claim 1 is characterized in that each output of comparator 1,3,4,5 and 6 all can be passed through resistance R
20Be connected with the base stage of triode.
3, multifunctional motor electronic protector according to claim 1, each output that it is characterized in that comparator 1,2 and 3 all can be respectively and light-emitting diode D
17～D
19Be connected.
4, multifunctional motor electronic protector according to claim 1 is characterized in that an end of relay J is connected with pressurizer W, and the other end is connected with the collector electrode of triode.
5, multifunctional motor electronic protector according to claim 1 is characterized in that reference signal d point current potential supplied with by pressurizer W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91232969 CN2107727U (en) | 1991-12-25 | 1991-12-25 | Multi-function electronic motor protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91232969 CN2107727U (en) | 1991-12-25 | 1991-12-25 | Multi-function electronic motor protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2107727U true CN2107727U (en) | 1992-06-17 |
Family
ID=4937905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91232969 Pending CN2107727U (en) | 1991-12-25 | 1991-12-25 | Multi-function electronic motor protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2107727U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106528481A (en) * | 2016-12-29 | 2017-03-22 | 无锡华润矽科微电子有限公司 | Discharge circuit integrated behind bus rectifier bridge at interior of slave chip |
-
1991
- 1991-12-25 CN CN 91232969 patent/CN2107727U/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106528481A (en) * | 2016-12-29 | 2017-03-22 | 无锡华润矽科微电子有限公司 | Discharge circuit integrated behind bus rectifier bridge at interior of slave chip |
| CN106528481B (en) * | 2016-12-29 | 2021-10-15 | 华润微集成电路(无锡)有限公司 | Bus rectifier bridge post-discharge circuit integrated in slave chip |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| AD01 | Patent right deemed abandoned | ||
| C20 | Patent right or utility model deemed to be abandoned or is abandoned |