CN2212277Y

CN2212277Y - powerless motor protector with display function

Info

Publication number: CN2212277Y
Application number: CN 94235979
Authority: CN
Inventors: 马亚军
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-12-13
Filing date: 1994-12-13
Publication date: 1995-11-08
Anticipated expiration: 2004-12-13

Abstract

The utility model relates to a powerless motor protector with display function, which is composed of a sampling display circuit A, a phase-lacking testing circuit B, an overflowing checking display circuit C, a time delay circuit D and an executive circuit E. The circuit A is separately connected with the circuit C and the circuit B. The circuit C is separately connected with the circuit D and the circuit E. The circuit B is connected with the circuit D. The circuit D is connected with the circuit E. Compared with the prior art, the protector has the advantages of small volume, simple structure, safe and reliable operation without working power supply, broad application, direct viewing fault testing, etc.

Description

powerless motor protector with display function

The utility model relates to a kind of motor protecter, specifically a kind of non-transformer motor protecter with Presentation Function.

At present be used for the technology of phase shortage, overcurrent safeguard protection in the prior art and install more; but generally still adopt heater element as protection component; this kind form makes its protective device volume bigger; structure is comparatively complicated; functional reliability is relatively poor; be used for phase shortage and overcurrent protection simultaneously and influence each other greatlyyer, and must be connected to working power, itself also produces certain energy consumption.Though some electronic protector has overcome the some shortcomings part, its range of application has certain limitation, as is used for motor Y-△ and starts, change anyway and start and the combination start-up circuit then can't use.In addition; present normally used motor protecter does not have Presentation Function; can only judge whether to break down by observing electric current, voltmeter and hand contact motor housing to operation irregularity states such as the phase shortage of motor, overcurrents, bring inconvenience for like this practical operation attendant.

The purpose of this utility model is the insufficient section that overcomes above-mentioned technology, but provides that a kind of volume is little, simple in structure, safe and reliable, the non-transformer motor protecter with Presentation Function that phase shortage and overcurrent protection are independent of each other, need not to set up separately working power, obvious energy conservation, applied range and visual inspection.

The purpose of this utility model realizes in the following manner: the non-transformer motor protecter with Presentation Function is made up of sampling display circuit A, lack detection circuit B, over-current detection display circuit C, delay circuit D and executive circuit E; sampling display circuit A joins with lack detection circuit B and over-current detection display circuit C respectively; over-current detection display circuit C joins with delay circuit D and executive circuit E respectively; lack detection circuit B and delay circuit D join, and delay circuit D and executive circuit E join.After the electromotive force that is produced on the current transformer is by diode displaying and rectification, filtering, energy storage, voltage stabilizing, supply with working power of whole protecting circuit during machine operation; the definite running parameter of operating state that runs well according to motor inputs to integrated circuit; lack detection circuit of being made up of integrated circuit and over-current detection display circuit are by the difference of sampling display circuit input signal; pass to delay circuit and export different signals, its control executive circuit is protected the different operating state of motor.

The utility model is because the electromotive force that only need utilize current transformer to produce comes the usefulness for the whole protecting circuit work power; so structure is simple especially; the phase shortage, the over current fault that had been taken place when this technical scheme both can play motor rotation simultaneously detect protection, can recognize concrete failure cause very intuitively again.Because the whole protecting circuit is to come work by the more weak induced electromotive force of energy, be independent of each other for making to detect to protect with demonstration work, the technical program has made full use of the positive and negative half cycle of alternating current, so improved the security reliability of whole protecting circuit working.The technical program is adapted at using on the motor of various uses.

Figure of description 1 is circuit theory diagrams of the present utility model;

Figure of description 2 is a schematic block circuit diagram of the present utility model.

In conjunction with specific embodiments the utility model is done following detailed description the in detail with reference to Figure of description.

In the circuit: IC-integrated circuit LM324, BG-triode 3DG12, D _1-6--diode IN4000, D _7-12, D ₁₈--diode IN4148, D _13-16--LED.

Non-transformer motor protecter with Presentation Function of the present utility model; form by sampling display circuit A, lack detection circuit B, over-current detection display circuit C, delay circuit D and executive circuit E; sampling display circuit A joins with lack detection circuit B and over-current detection display circuit C respectively; over-current detection display circuit C joins with delay circuit D and executive circuit E respectively; lack detection circuit B and delay circuit D join, and delay circuit D and executive circuit E join.Sampling display circuit A is by current transformer L ₁-L ₃, diode D ₁-D ₆, light-emitting diode D ₁₃-D ₁₅, capacitor C ₁-C ₃Form, wherein L ₁-L ₃End line be in parallel the back ground connection, L ₁The other end respectively with D ₄, C ₁And D ₁, D ₁₃Ground connection after being in series, L ₂The other end respectively with D ₅, C ₂And D ₂, D ₁₄Ground connection after being in series, L ₃The other end respectively with D ₆, C ₃And D ₃, D ₁₅Back ground connection is in series.Lack detection circuit B is by integrated circuit (IC), diode D ₁₀-D ₁₂, resistance R ₁-R ₃, R ₁₂-R ₁₅Form, wherein R ₁, D ₁₀The end D among back and the sampling display circuit A that joins ₄, C ₁Contact links, R ₂, D ₁₁An end join the back and D ₅, C ₂Contact links, R ₃, D ₁₂An end join the back and D ₆, C ₃Contact links, R ₁-R ₃Other end ground connection, D ₁₀-D ₁₂Other end parallel connection after join resistance R with integrated circuit (IC) input pin 9 ₁₂, R ₁₃And R ₁₄, R ₁₅Ground connection after being in series respectively, resistance R ₁₂, R ₁₃And R ₁₄, R ₁₅Contact connect integrated circuit (IC) input pin 9 and IC input pin 10, resistance R respectively ₁₂, R ₁₄The other end be in parallel and connect.Over-current detection display circuit C is by integrated circuit (IC), diode D ₇-D ₉, resistance R ₄, R ₇, R ₉-R ₁₁, adjustable resistance W, capacitor C ₄, voltage-stabiliser tube D ₁₇, light-emitting diode D ₁₆Form, wherein D ₇-D ₉An end respectively with lack detection circuit B in D ₁₀And R ₁, D ₁₁And R ₂, D ₁₂And R ₃Contact link D ₇-D ₉The other end be in parallel the back with lack detection circuit B in R ₁₂, R ₁₄And interface joins, simultaneously should and interface and ground between also be connected to respectively by adjustable resistance W, resistance R ₉Pressure sampling circuit that is in series and capacitor C ₄, W, R ₉Contact connect IC input pin 3, should and interface series resistance R also ₄Be connected to voltage-stabiliser tube D respectively between back and the ground ₁₇And resistance R ₁₀, R ₁₁The pressure sampling circuit of series connection, resistance R ₁₀, R ₁₁Contact connect integrated circuit (IC) input pin 2, be connected to resistance R between integrated circuit (IC) output pin 1 and the ground ₇With light-emitting diode D ₁₆The overcurrent display circuit that is in series.Delay circuit D is by integrated circuit (IC), R ₅, R ₆, C ₅Form, wherein integrated circuit (IC) supply pin 4, pin 11 respectively with over-current detection display circuit C in R ₄, D ₁₇, R ₁₀Contact and ground join, resistance R among integrated circuit (IC) input pin 6 and the over-current detection display circuit C ₁₀, R ₁₁Contact link, be connected to capacitor C between IC input pin 5 and the ground ₅, IC input pin 5 also passes through resistance R simultaneously ₅, R ₆After the parallel connection respectively with over-current detection display circuit C among integrated circuit (IC) output pin 1 and the lack detection circuit B integrated circuit (IC) output pin 8 join.Executive circuit E is by triode BG, relay J, diode D ₁₈, resistance R ₈Form, wherein the base stage of BG is passed through resistance R ₈Join with integrated circuit (IC) output pin 7 among the delay circuit D, the emitter of BG joins C among the collector electrode series relay J coil of BG and the over-current detection display circuit C with ground ₄, R ₄, the W contact joins diode D ₁₈Be connected in parallel on the two ends of relay J coil.Its operation principle is as follows: run well at motor, promptly not during the overcurrent operating state, have electric current to flow through in the power line, current transformer L ₁, L ₂, L ₃The positive half cycle of the induced electromotive force that is produced is by diode D ₁, D ₂, D ₃Driven for emitting lights diode D ₁₃, D ₁₄, D ₁₅Show that the indication three-phase current is normal, the positive half cycle of this electromotive force is respectively by diode D ₄, D ₅, D ₆Rectification and capacitor C ₁, C2, C ₃After the filtering, in resistance R ₁, R ₂, R ₃On obtain a direct voltage stably respectively, this voltage is that direct ratio changes along with the size of current in the power line, diode D under the biasing of its voltage ₁₀, D ₁₁, D ₁₂Be cut-off state, and diode D ₇, D ₈, D ₉Be conducting state then, lead up to resistance R ₄, voltage-stabiliser tube D ₁₇The composition voltage stabilizing circuit is a resistance R ₁₀, R ₁₁Pressure sampling circuit and the integrated circuit (IC) supply pin 4 formed provide working power, and another road is through capacitor C ₄The charging energy storage one the tunnel is also supplied with adjustable resistance W, resistance R again for the usefulness of the working power of relay J ₉Promptly direct ratio changes with size of current in the power line road for the usefulness of forming the pressure sampling circuit power supply, this supply voltage.The running parameter of integrated circuit (IC) requires voltage to be defined as V(-during because of operate as normal)＞V(+), i.e. so voltage on voltage＞input pin 3 on the integrated circuit (IC) input pin 2 is W, R ₉Contact dividing potential drop sampling voltage is a no-voltage.And the voltage on the integrated circuit (IC) input pin 2 is through resistance R ₄, voltage-stabiliser tube D ₁₇And resistance R ₁₀, R ₁₁The stable benchmark voltage V(-that pressure sampling circuit obtains), its reference voltage is not change with size of current in the power line road.Therefore so integrated circuit (IC) output pin 1 output no-voltage during the motor operate as normal is light-emitting diode D ₁₆Do not have and show capacitor C ₅Do not charge, delay circuit and executive circuit do not work.When over current fault appears in motor, capacitor C ₁, C ₂, C ₃On voltage increases capacitor C thereupon ₄On voltage also increase, because of adjustable resistance W, resistance R ₉Working power direct ratio changes with size of current in the power line road, at this moment by adjustable resistance W, resistance R ₉The voltage that the pressure sampling circuit of forming is applied on the integrated circuit (IC) input pin 3 also increases thereupon, voltage on the integrated circuit (IC) input pin 3 then is higher than the reference voltage on the IC input pin 2 at this moment, be 1 output HIGH voltage of integrated circuit (IC) output pin, lead up to resistance R ₇Driven for emitting lights diode D ₁₆Show over-current signal, resistance R is passed through on another road ₅To capacitor C ₅Charging, R ₅, C ₅Form the RC integrator delay-time circuit, delay time determined by the RC time constant, because of the reference voltage of integrated circuit (IC) is similarly V(-)＞V(+), promptly the voltage on the IC input pin 6 equally also is a stable benchmark voltage.Work as capacitor C ₅When being charged to certain voltage, when promptly the voltage on the integrated circuit (IC) input pin 5 was higher than reference voltage on the IC input pin 6, at this moment 7 output HIGH voltages of integrated circuit (IC) output pin passed through resistance R ₈Make triode BG work, relay J move and cut off electrical source of power, thereby the overcurrent of realizing motor show and protection.Run well at motor, promptly not during the phase shortage operating state, by current mutual inductor coil L ₁, L ₂, L ₃The negative half period of the induced electromotive force that is produced is by diode D ₁, D ₂, D ₃Driven for emitting lights diode D ₁₃, D ₁₄, D ₁₅Show, represent that promptly three phase mains is normal, at this moment diode D ₁₀, D ₁₁, D ₁₂Be in cut-off state.Because the determined running parameter of this circuit requires to be resistance R ₁₂=R ₁₄, R ₁₃＞R ₁₅So the reference voltage on the integrated circuit (IC) input pin 9 is through resistance R ₁₂, R ₁₃The definite value V(-that bleeder circuit obtains), voltage V(+ on the IC input pin 10) be no-voltage, voltage when being operate as normal on the integrated circuit (IC) is V(-)＞V(+), integrated circuit (IC) output pin 8 is not worked for no-voltage event delay circuit yet at this moment, be that integrated circuit (IC) output pin 7 output voltages are zero, then triode BG does not work, and relay J is failure to actuate.When motor generation open-phase fault, one of phase shortage group of current transformer L then ₁(L ₂, L ₃) then influence electricity kinetic potential generation, i.e. light-emitting diode D ₁₃(D ₁₄, D ₁₅) the nothing demonstration, diode D ₄(D ₅, D ₆) no current flows through capacitor C ₁(C ₂, C ₃) pass through resistance R this moment ₁(R ₂, R ₃) discharge, its voltage voltage that goes to zero.Diode D ₇(D ₈, D ₉) because of still having induced electromotive force to produce, other two-phase instead ends diode D partially ₁₀(D ₁₁, D ₁₂) then conducting, resistance R at this moment ₁(R ₂, R ₃) be equivalent to and resistance R ₁₃Parallel connection is because of the determined running parameter of this circuit requires to be resistance R ₁₂=R ₁₄, R ₁₃＞R ₁₅, and resistance R ₁₃At this moment with resistance R ₁(R ₂, R ₃) resistance value after the parallel connection is then less than resistance R ₁₅So when phase shortage takes place on a certain road, the voltage on the integrated circuit (IC) input pin 9 will be lower than the voltage on the IC input pin 10, i.e. V(-)＜V(+), 8 output HIGH voltages of integrated circuit (IC) output pin this moment pass through resistance R ₆To capacitor C ₅Charging, i.e. R ₆, C ₅Capacitor C is worked as in the integrator delay-time circuit time-delay of forming ₅When being charged to certain voltage, then integrated circuit (IC) output pin 7 output HIGH voltages make triode BG work, the actuating of relay and cut off electrical source of power, thereby realize the open-phase protection of motor.Power line partly be electrical network three-phase electrical source of power U, V, W by electromagnetic switch K, join with motor M after passing current transformer core.Control loop partly is by starting button S ₁With electromagnetic switch K often make war in parallel after, with the S that stops key ₂, the coil of electromagnetic switch K and executive circuit repeat circuit J normally closed some series connection back insert electrical source of power W, V phase.During work, press startup button S ₁, power supply is promptly by the S that stops key ₂, the coil of electromagnetic switch K and relay J normally closed point constitute the loop, make electromagnetic switch K action, motor rotation, press the S that stops key in the time of need stopping ₂Get final product.When motor generation overcurrent, open-phase fault, by the foregoing course of work, its normally closed some J in control loop is opened by executive circuit repeat circuit J action, i.e. control loop dead electricity, electromagnetic switch K disconnects, and motor shuts down.The technical program also is fit to other threephase load and uses.

Claims

1, a kind of non-transformer motor protecter with Presentation Function, comprise sampling display circuit A, lack detection circuit B, over-current detection display circuit C, delay circuit D, executive circuit E, the display circuit A that it is characterized in that sampling joins with lack detection circuit B and over-current detection display circuit C respectively, over-current detection display circuit C joins with delay circuit D and executive circuit E respectively, lack detection circuit B and delay circuit D join, and delay circuit D and executive circuit E join; Said sampling display circuit A is by current transformer L ₁-L ₃, diode D ₁-D ₆, light-emitting diode D ₁₃-D ₁₅, capacitor C ₁-C ₃Form, wherein L ₁-L ₃End line be in parallel the back ground connection, L ₁The other end respectively with D ₄, C ₁And D ₁, D ₁₃Ground connection after being in series, L ₂The other end respectively with D ₅, C ₂And D ₂, D ₁₄Ground connection after being in series, L ₃The other end respectively with D ₆, C ₃And D ₃, D ₁₅Back ground connection is in series; Said lack detection circuit B is by integrated circuit (IC), diode D ₁₀-D ₁₂, resistance R ₁-R ₃, R ₁₂-R ₁₅Form, wherein R ₁, D ₁₀The end D among back and the sampling display circuit A that joins ₄, C ₁Contact links, R ₂, D ₁₁An end join the back and D ₅, C ₂Contact links, R ₃, D ₁₂An end join the back and D ₆, C ₃Contact links, R ₁-R ₃Other end ground connection, D ₁₀-D ₁₂Other end parallel connection after join resistance R with integrated circuit (IC) input pin 9 ₁₂, R ₁₃And R ₁₄, R ₁₅Ground connection after being in series respectively, resistance R ₁₂, R ₁₃And R ₁₄, R ₁₅Contact connect integrated circuit (IC) input pin 9 and IC input pin 10, resistance R respectively ₁₂, R ₁₄The other end be in parallel and connect; Said over-current detection display circuit C is by integrated circuit (IC), diode D ₇-D ₉, resistance R ₄, R ₇, R ₉-R ₁₁, adjustable resistance W, capacitor C ₄, voltage-stabiliser tube D ₁₇, light-emitting diode D ₁₆Form, wherein D ₇-D ₉An end respectively with lack detection circuit B in D ₁₀And R ₁, D ₁₁And R ₂, D ₁₂And R ₃Contact link D ₇-D ₉The other end be in parallel the back with lack detection circuit B in R ₁2, R ₁₄And interface joins, simultaneously should and interface and ground between also be connected to respectively by adjustable resistance W, resistance R ₉Pressure sampling circuit that is in series and capacitor C ₄, W, R ₉Contact connect IC input pin 3, should and interface series resistance R also ₄Be connected to voltage-stabiliser tube D respectively between back and the ground ₁₇And resistance R ₁₀, R ₁₁The pressure sampling circuit of series connection, resistance R ₁₀, R ₁₁Contact connect integrated circuit (IC) input pin 2, be connected to resistance R between integrated circuit (IC) output pin 1 and the ground ₇With light-emitting diode D ₁₆The overcurrent display circuit that is in series; Said delay circuit D is by integrated circuit (IC), R ₅, R ₆, C ₅Form, wherein integrated circuit (IC) supply pin 4, pin 11 respectively with over-current detection display circuit C in R ₄, D ₁₇, R ₁₀Contact and ground join, resistance R among integrated circuit (IC) input pin 6 and the over-current detection display circuit C ₁₀, R ₁₁Contact link, be connected to capacitor C between IC input pin 5 and the ground ₅, IC input pin 5 also passes through resistance R simultaneously ₅, R ₆After the parallel connection respectively with over-current detection display circuit C among integrated circuit (IC) output pin 1 and the lack detection circuit B integrated circuit (IC) output pin 8 join; Said executive circuit E is by triode BG, relay J, diode D ₁₈, resistance R ₈Form, wherein the base stage of BG is passed through resistance R ₈Join with integrated circuit (IC) output pin 7 among the delay circuit D, the emitter of BG joins C among the collector electrode series relay J coil of BG and the over-current detection display circuit C with ground ₄, R ₄, the W contact joins diode D ₁₈Be connected in parallel on the two ends of relay J coil.