CN1032995C - Three-phase asynchronous motor protector - Google Patents
Three-phase asynchronous motor protector Download PDFInfo
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- CN1032995C CN1032995C CN 93117426 CN93117426A CN1032995C CN 1032995 C CN1032995 C CN 1032995C CN 93117426 CN93117426 CN 93117426 CN 93117426 A CN93117426 A CN 93117426A CN 1032995 C CN1032995 C CN 1032995C
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Abstract
The present invention relates to a protector of a three phase asynchronous motor, which is composed of a current detection circuit and a control circuit, wherein the current detection circuit uses a three phase current and voltage transformer; the control circuit is composed of a rectification filtering circuit, a phase failure protective circuit, an overload and over current protection circuit, a locked rotor protective circuit, a master control gate, a driving circuit, a phase fault memory circuit, a phase fault display circuit, a memory circuit of overload and over current faults, a display circuit of overload and over current faults, an identify circuit of motor operating states, a display circuit of motor operating states, etc. The protector has the advantages of high detection precision, wide linear range, unsaturation iron core, etc.
Description
The present invention is a three-phase asynchronous motor protector, can make the phase failure, overload, overcurrent and rotation-clogging protection to threephase asynchronous effectively.
The common power pack of present existing threephase asynchronous machine protector employing detects three-phase current signal (paying the limit open circuit uses), and its accuracy of detection is low, and linearity is poor, dynamic range is little, and iron core is easy to full closing.In order to solve that the asynchronous motor starting electric current is higher than rated current and the problem that makes the protector misoperation, generally the method that all adopts deferred action when this mode is seriously transshipped at motor, is disadvantageous to motor to avoid starting current.
The objective of the invention is to propose a kind of method that adopts special alternating current-voltage changer as the detection motor current.This converter can be proportional voltage signal with it with the current conversion of motor.Not only improved the accuracy of detection to electric current, and the range of linearity is wide, the iron core insatiable hunger is closed, event is effective to the protection of motor.Adopt integrated circuit that the starting current curve is followed the tracks of simultaneously, misoperation can not take place when starting, starting finishes and can transship overcurrent protection normally.Can detect having or not of three-phase current, open phase fault is carried out logic determines.When the phase failure takes place, send trip signal.When electric motor starting generation stall fault, also can send stall signal cut power supply.And this protector all can remember above-mentioned various faults, and shows failure cause.Before adopting a Tricolor LED to send orange, red, green three kinds of colors simultaneously to show electric motor starting respectively, starting process and three kinds of states of operate as normal.
Major technique content of the present invention is: this three-phase asynchronous motor protector is made up of testing circuit and control circuit.
Current detection circuit I: adopt three-phase current-voltage changer 1, this converter is made up of three electric current-voltage changers making with annular core.On every annular core, be wound with balance coil L respectively
0With potential winding L
2, L
0In order to the balance input current at primary coil L
1The middle magnetic potential that produces is to ensure at potential winding L
2The voltage signal of last generation is directly proportional with input current, and waveform is undistorted.Electric current-voltage changer structural representation is seen Fig. 3, its schematic diagram such as Fig. 4 (Fig. 3, Fig. 4 only draw a phase).The power line of motor passes the feedthrough hole of electric current-voltage changer.Can be a circle, also can be the number circle.Three such electric current-voltage changers are contained in forms a three-phase current-voltage changer in the plastic shell, its potential winding is connected into star and is drawn by terminal, profile such as Fig. 5.
Control circuit II: by rectification circuit 2, open-phase protection circuit 3, overload flow protective circuit 4; rotation-clogging protection circuit 5, master control door 6, drive circuit 7; open phase fault memory circuit 8; open phase fault display circuit 9, overload flow fault memory circuit 10, overload flow display circuit 11; electric machine operation state identification circuit 12; electric machine operation state display circuit 13, reset circuit 14, power circuit 15 is formed.As shown in Figure 1.
Rectifying and wave-filtering road 2: by diode D
1～D
3, capacitor C
1～C
3Form.This circuit is connected with three-phase current-voltage changer output, the three-phase current-voltage signal of voltage changer output can be carried out rectification, filtering and delivers to open-phase protection circuit and overload flow protective circuit more simultaneously.
Open-phase protection circuit 3: by operational amplifier LM
1～LM
3, not gate F
1, F
2, NAND gate M
1～M
3, R
16, C
8And schmitt inverter F
3Deng composition.LM
1～LM
3Input be connected with the output of current rectifying and wave filtering circuit, by LM
1～LM
3Current signal is carried out zero-detection, promptly detect having or not of each phase current of motor.LM
1～LM
3Output deliver to by F
1, F
2And M
1～M
3Whether the phase failure identification circuit of forming with the identification motor open phase fault takes place.R is delivered in the output of phase failure identification circuit again
16, C
8, F
3The delay circuit of forming, master control gate circuit and phase failure memory circuit are delivered in the output of delay circuit simultaneously.Delay circuit works the misoperation effect of avoiding.F in this circuit simultaneously
1Output deliver to the electric machine operation state identification circuit.
Overload flow protective circuit 4: this circuit is made up of inverse time lag circuit, current tuning circuit, comparison circuit, control gate, starting exclusive circuit, delay circuit, starting current testing circuit, starting curve tracking circuit etc.; Inverse time lag, circuit was by resistance R
8～R
13, capacitor C
5～C
7Form.Input is connected with the output of current rectifying and wave filtering circuit, and the effect of this circuit is the antijamming capability that current signal is carried out inverse time-lag, enhancing motor protecter.Its output is received comparison circuit; Current tuning circuit is by resistance R
13, R
14, potentiometer W
1Form with voltage-stabiliser tube 2CW.In order to the numerical value of the protector operating current of adjusting, the effect of voltage-stabiliser tube is the precision that improves protector.This circuit output end is received the input of comparison circuit; Comparison circuit is by operational amplifier LM
5～LM
7Form.The normal phase input end of three fortune amplifiers connects together, and receives current tuning circuit W
1Middle moving contact on.LM
5～LM
7Three inverting inputs receive three outputs (these three transport and placing devices adopt anti-phase input type) of inverse time lag circuit respectively.Three outputs of three transport and placing devices are delivered to control gate; Control gate adopts NAND gate M
9NAND gate M
9Three inputs receive three outputs of comparison circuit, NAND gate M respectively
9Actual plaing a part or door, no matter which overload flow fault, M occur to motor mutually
9Can both send fault-signal.This circuit output end is received the starting exclusive circuit; The starting exclusive circuit adopts NAND gate M
10, M
10An input termination control gate M
9Output, the output of the S3 of another input termination starting curve tracking circuit.The effect of this circuit is NAND gate M when electric motor starting
10By S
3The low level of output is shut, NAND gate M when making starting
9The overload flow signal of output can not pass through M
10, ensure that motor starts smoothly.The output of this circuit is received delay circuit; Delay circuit is by resistance R
30, capacitor C
10And schmitt inverter F
11Form.The output of its input termination starting exclusive circuit.The effect of this circuit be with the overload flow signal lag about 1.2 seconds to improve the antijamming capability of protector.Its output connects the input of master control door and the memory circuit of overload flow fault simultaneously; The starting current testing circuit is by resistance R
6, R
7With operational amplifier LM
4Form.Its input is come by current rectifying and wave filtering circuit, through R
6, R
7Receive LM after the dividing potential drop
4Normal phase input end, be used for detecting the starting current of motor.Its output is received rotation-clogging protection circuit and starting current curve tracking circuit simultaneously; Starting current curve tracking circuit is by R-S trigger S
2, S
3, not gate F
9, F
10, NAND gate M
7, M
8Deng composition.This circuit is used to differentiate the starting state and the normal operating conditions of motor.When motor is in starting state, this circuit will start the M of exclusive circuit
10Turn off, ensure that motor can start smoothly; When electric motor starting finishes, this circuit was again with M when current of electric returned to normal value
10Open, the guarantee motor can be protected motor when the overload flow fault takes place.Its output is received starting exclusive circuit M simultaneously
10Input and electric machine operation state display circuit.
Rotation-clogging protection circuit 5: by not gate F
5～F
9, NAND gate M
5, resistance R
26, potentiometer W
2And capacitor C
9Form.Effect is when motor because mechanical reason rotates not, and when the stall fault promptly took place, this circuit sent the stall signal, the protection motor.Its input is come by the starting current testing circuit, and output is delivered to the master control door.
Master control gate circuit 6: adopt three input NAND gate M
6, three inputs of this circuit are received the output of open-phase protection circuit, overload flow protective circuit and rotation-clogging protection circuit respectively.The effect of this circuit is as any one output fault-signal of above-mentioned three protective circuits, M
6Can both export trip signal.M
6Be actually conduct or door use.Its output is received drive circuit.
Drive circuit 7: by not gate F
13, resistance R
27, R
28, compositions such as time-base circuit NE555.The effect of this circuit is that becoming the trip signal that the master control door is exported suitable is level, and improves driving force.The output of its input termination master control door.Its output connects the coil and the electric machine operation state display circuit of auxiliary relay simultaneously.
Fault display circuit 9,11: by not gate F
12, F
16And LED
1, LED
2Deng composition.Input is come by memory circuit.This circuit is used for showing the failure cause that motor takes place.
Operating state identification circuit 12 and operating state display circuit 13: by NAND gate M
14, M
15, not gate F
14, F
15And composition such as Tricolor LED LED3-1, LED3-2.This circuit input end is received the output of open-phase protection circuit and starting curve tracking circuit respectively.Before being used for discerning and showing electric motor starting, three kinds of dress attitudes of starting process and operate as normal.
Reset circuit 14: by button ANF, diode D
7D
9～D
12, NAND gate M
12, M
13Deng composition.Be used for each memory cell is resetted.Its output is received trigger S
1～S
4Reset terminal.
Power circuit 15: by transformer B, rectifier bridge ID, filter capacitor C
4And regulator block LM7812 forms.Effect is to provide+the 12V working power for each circuit.+ 12 volts of voltage V
CExpression.
All elements such as the integrated circuit in the control circuit, diode, resistance, electric capacity all are welded on the printed circuit board (PCB), are contained in the plastic shell, and light-emitting diode, current calibration potentiometer and reset button are contained on the panel; The output of the input of its current signal, 220 volts power supply inputs and the relay normally closed contact all terminal bottom plastic housing is drawn.All control circuit is fitted together and is called controller, and the external form schematic diagram as shown in Figure 6.The lead-out terminal of three-phase current-voltage changer links to each other with the current signal input terminal of lead and controller.
The method of attachment of three-phase asynchronous motor protector and circuit for controlling motor: the normally closed contact JK of the auxiliary relay of this protector is connected in the circuit for controlling motor.When motor broke down, protector disconnected JK, has cut off the control loop of motor, and the motor main circuit is cut off, and had protected motor.As shown in Figure 7.
Technique effect of the present invention is to adopt three-phase alternating current-voltage changer to detect three-phase current; the precision height, the range of linearity is wide, output voltage waveforms is undistorted; because the iron core insatiable hunger is closed, so the suitable capacity motor scope of this protector is big, 4～400KW motor all can.Also be applicable to simultaneously high-voltage asynchronous motor.Adopt CMOS integrated circuit, low in energy consumption, reliable operation.Protector structure compactness, volume little (6O * 85 * 120) (unit millimeter).Adopt the method for tracking motor starting curve to solve the problem of misoperation when asynchronous machine starts.Protect respond well.Have the phase failure, overload flow and rotation-clogging protection function, and can remember failure cause, show simultaneously.Before can enough Tricolor LEDs sending orange, red, green three kinds of colors and showing electric motor starting respectively, starting process, three kinds of states of operate as normal; Increase an identical three-phase current-voltage changer again, the input and output side of three phase electric machine winding respectively with the former limit L of two three-phase current-voltage changers
1Polyphone, the potential winding L of its three-phase alternating current-voltage transformation
2Be connected into two star circuits; the node of two stars connects together as a common port; leading-out terminal with other potential winding links to each other with the respective input of control circuit respectively; can realize the differential protection of threephase asynchronous; be used for large-size asynchronous motor or important threephase asynchronous are carried out more reliable protection, the wiring schematic diagram of two three-phase current-voltage changers as shown in Figure 8.
It is low that the present invention can overcome the used common current converter of prior motor protector accuracy of detection, and linearity is poor, dynamic range is little, the easily full problem of closing of iron core.Misoperation problem when adopting the way of tracking motor starting curve to solve electric motor starting simultaneously is than addressing this problem motor favourable with the way of delaying time.Show that the different operating state of motor is not only novel but also can judge the length of electric motor starting time with Tricolor LED.
Fig. 1 is a block diagram of the present invention;
Fig. 2 is circuit theory diagrams of the present invention;
Fig. 3 is a phase structure schematic diagram of three-phase current-voltage changer;
Fig. 4 is a facies principle winding diagram of three-phase current-voltage changer;
Fig. 5 is three-phase alternating current-voltage changer external form figure;
Fig. 6 is the appearance structure schematic diagram of control circuit of the present invention;
Fig. 7 is the external circuit connection schematic diagram of the present invention;
Fig. 8 is the wiring schematic diagram of differential protection three-phase alternating current-voltage changer and motor winding;
I current detection circuit, II control circuit, III threephase asynchronous control circuit.
1 three-phase current-voltage changer; 2 current rectifying and wave filtering circuits; 3 open-phase protection circuits; 4 overload flow protective circuits; 5 rotation-clogging protection circuit; 6 master control doors; 7 drive circuits; 8 open phase fault memory circuits; 9 open phase fault display circuits; 10 overload flow fault memory circuits; 11 overload flow fault display circuits; 12 electric machine operation state identification circuits; 13 electric machine operation state display circuits; 14 reset circuits; 15 power circuits; 16 asynchronous machine control circuits (circuit outside this protector); 1 ' electric current-voltage changer primary coil; 2 ' electric current-voltage changer iron core; 3 ' electric current-voltage changer potential winding; 4 ' electric current-voltage changer balance coil.
Principle analysis: the circuit theory diagrams of protector are seen Fig. 2, and the connection schematic diagram of protector in circuit for controlling motor seen Fig. 7.
Current detection circuit: the motor three-phase current flows through through three feedthrough holes of three-phase current-voltage changer, produce three voltage signals that are directly proportional with electric current at its potential winding, this signal is exported the current rectifying and wave filtering circuit of delivering in the control circuit by the terminal of converter.
Current rectifying and wave filtering circuit: the current signal that is attracted by terminal is through D
1～D
3Rectification, C
1～C
3Deliver to open-phase protection circuit, overload flow protective circuit and starting current testing circuit after the filtering more simultaneously.
Open-phase protection circuit is analyzed: the input of this circuit is connected with current rectifying and wave filtering circuit, and three current signals are respectively by R
1～R
3Receive operational amplifier LM
1～LM
3Three inputs, LM
1～LM
3Other three inputs connect together and receive by resistance R
4And R
5On the voltage divider of forming, to obtain suitable reference level.LM
1, LM
2The input of employing positive, LM
3Adopt anti-phase input, LM
1～LM
3Formed in order to detect the zero-detection circuit that three-phase current has or not, its three outputs are received by not gate F
1, F
2, NAND gate M
1～M
3Whether the logical circuit of forming in order to differentiate the phase failure takes place.If represent three-phase current signal with A, B, C, then the door M
4Output
Like this, when three-phase current all has or all do not have, M
4Be output as 0, have only when the arbitrary phase phase failure M
4Output just be 1.M
4Output receive by R
16, C
8And Schmidt's not gate F
3The delay circuit of forming is delivered to master control door M more simultaneously about 0.8 second through delaying time
6With phase failure memory circuit.The purpose of time-delay is to strengthen antijamming capability.
The overload flow protective circuit is analyzed: its input is received current rectifying and wave filtering circuit, and three current signals are input to by resistance R
6～R
13And capacitor C
5～C
7Three inverse time lag circuit forming so that current signal is carried out inverse time-lag, are delivered to the input of comparison circuit again.
Comparison circuit is by operational amplifier LM
5～LM
7Form, its three inverting inputs connect the inverse time lag circuit respectively, and normal phase input end connects together and receives current tuning circuit W
1The moving contact of centre.This circuit is in order to the three-phase current of differentiating motor overload flow whether, and when arbitrary when the overload flow fault takes place mutually, corresponding transport and placing device is output low level (hereinafter with 1 representing high level, representing low level with 0) just.Three outputs of this circuit are received control gate M
9
In the current tuning circuit ,+12V power supply V
CThrough resistance R
14Current limliting receives voltage-stabiliser tube 2CW voltage is stabilized to+and 6V is W
1Provide stable voltage, to improve the precision of protector.W
1Middle contact receive LM
5～LM
7Three normal phase input ends (connecting together), W
1In order to regulate the numerical value of setting current.
NAND gate M in the control gate circuit
9Three inputs receive LM
5～LM
7Three outputs, like this, during no matter any phase overload flow, NAND gate M
9All export 1.M
9Output deliver to the NAND gate M of starting in the exclusive circuit simultaneously
10With the NAND gate M in the starting curve tracking circuit
7
Starting exclusive circuit NAND gate M
10An input receive control gate M
9Output, M
10Another input receive the output of the S3 in the starting aircraft pursuit course circuit.When starting, S
3Be output as 0, though so the time because the starting current that is much higher than rated current has made M
9Be output as 1, but because S
3Be output as 0, M
10Shut, so M
9The fault-signal of output can't pass through M
10, guarantee that motor starts smoothly.M
10Output termination delay circuit.
Delay circuit is with M
10About about 1.2 seconds of the overload flow signal lag of output is to avoid the protector misoperation.Delay circuit is by R
30, C
10, F
11Form, master control door and overload flow fault memory circuit are delivered in its output simultaneously.
The input of starting current testing circuit is come by current rectifying and wave filtering circuit.The A phase current signal is through R
6, R
7Deliver to operational amplifier LM after the dividing potential drop
4Normal phase input end, LM
4Inverting input receive LM
5～LM
7Public normal phase input end.Because current signal is through resistance R
6, R
7So decay is LM
4Only output just is 1 when starting current reaches 2 times of rated current left and right sides.So just, can detect motor and whether be in starting state, starting curve tracking circuit and rotation-clogging protection circuit are delivered in the output of this circuit simultaneously.
The starting curve tracking circuit is analyzed: the signal of starting current testing circuit output is received the F of this circuit
9Input, through F
9Anti-phase again by C
14Be coupled to R-S trigger S
2The set end.Before electric motor starting, trigger S
2, S
3Automatically reset, simultaneously LM
4Be output as 0, F
9Be output as 1, behind electric motor starting, when starting current reaches 2 times of rated current, LM
4Be output as 1, F
9Output becomes 0 by 1, but S
2Still be in reset mode (this R-S trigger adopts and jumps in the pulse along triggering), M
3Output still be 1, it is exported S
3There is not influence, so S
3Output still be 0, S
3Output with M
10Shut.Though very big, the M of electric motor starting electric current at this moment
9Output has been 1, but owing to can't pass through M
10So, M
9Fault-signal can not reach master control door M
6, ensure that motor starts smoothly.When motor speed rises, starting current is descended gradually by maximum, when electric current drops to 2 times of rated current when following, LM
4Output becomes 0 by 1, F
9Output become 1 by 0, this saltus step is through C
14Be coupled to S
2, make S
2Set, it exports Q
2=1, but since this moment electric current still be higher than rated current, so M
9Output still is 1, M
7Be output as 0, M
8Output still is 1, F
10Output still is 0, so S
3Still be in reset mode, Q
3=0, M
10Still shut.When electric current continues to drop to the setting current value when following, M
9Output becomes 0, M
7Be output as 1, the front has analyzed S
2Output Q
2Be 1, M like this
8Two inputs all be 1, its output becomes 0, F by 1
10Output become 1 by 0, through C
16Be coupled to S
3Make S
3Set Q
3=1, Q
3To start latching door M
10Open, make protector be transferred to normal guard mode motor.S
3Output receive electric machine operation state identification and display circuit thereof simultaneously.
The rotation-clogging protection circuit analysis: when starting, the stall fault as taking place in motor, and the electric motor starting electric current makes LM
4Be output as 1, and will remain 1 always.(because starting current can not drop to normal value behind the motor rotation blockage) LM before electric motor starting
4Be output as 0, F
7Be output as 1, make capacitor C
9Negative pole be high level, C
9Positive pole through W
2And R
26Receive power supply V
C, also be high level.C before electric motor starting like this
9Both end voltage is 0.Behind electric motor starting, LM
4Be output as 1, F
7Output becomes 0 by 1, like this C
9The negative pole current potential also become 0 because capacitor voltage at both ends can not suddenly change, so C
9Anodal current potential become 0, make F
5Be output as 1, F
6Be output as 0, thereby NAND gate M
5Output still is 1, no stall signal output.This moment F
7Be output as 0, F
8Be output as 1.Along with power supply V
CPass through W
2And R
26To C
9Charging, C
9Anodal current potential raises gradually, when being elevated to F
5Threshold voltage the time, F
5Output becomes 0 by 1, F
6Output becomes 1 by 0, at this moment F
8Output also be 1, M like this
5One or two input is 1, and its output becomes 0 by 1, sends the stall fault-signal, through master control door M
6And send trip signal behind the drive circuit, motor power is cut off.W
2Be used for regulating the time of sending signal after stall takes place, to satisfy the needs of different motors.
The master control gate circuit is analyzed: this circuit adopts NAND gate M
6, M
6Three inputs receive open-phase protection circuit respectively.The output of overload flow protective circuit and rotation-clogging protection circuit, when above-mentioned arbitrary protective circuit is exported fault-signal (fault-signal works when being 0), M
6Be output as 1, M
6Actual plaing a part or door.M
6Output connect drive circuit.
Drive circuit is analyzed: the fault letter that the master control door sends is after R
27Be input to the F of this circuit
13, again by F
13Through resistance R
28The input of then basic circuit NE555, F
13Play the level change action, NE555 plays power amplification, and NE555 is used for driving the coil of auxiliary relay JK.Diode D
5Be fly-wheel diode, be used for protecting NE555.C
19It is anti-interference capacitor; R
27, R
28Be the level isolation resistance; D
4Being used for the prime that output signal with NE555 feeds back to its input is used for to the NE555 self-locking.The normally closed contact of JK is connected in series in the control loop of motor, so that when motor breaks down, cuts off the power supply of motor.The two ends of JK normally closed contact are drawn by the terminal of controller.
Memory circuit is analyzed: when motor sends phase failure signal, and F
3Level become 0 by 1, F
4Level become 1 by 0, through C
12Be coupled to S
1The set end, phase failure signal is remembered S
1Output receive phase failure display circuit, when motor generation overload flow fault, F
11Level becomes 0 by 1, M
15Level become 1 by 0, through C
18Be coupled to S
4Make S
4Set is remembered fault-signal, S
4Output to the overload flow fault display circuit.
Fault display circuit is analyzed: input is come by memory circuit, and phase failure memory circuit is S when the phase failure
1Be output as 1, make F
12Level becomes 0 by 1, red light emitting diodes LED
1Electrified light emitting shows open phase fault, when motor generation overload flow fault, and the S of memory circuit
4Be output as 0, green LED LED
2Conducting is luminous, shows the overload flow fault.F
12And F
16Simultaneously as buffer, for light-emitting diode provides drive current.
Operating state identification circuit and operating state display circuit: the door M of this circuit
14The output that input is received the F1 of open-phase protection circuit, when motor during at prestart, LM
1Be output as 0, F
1Be output as 1, S
3Be output as 0, F
14Be output as 1, so NAND gate M
14Be output as 0.D
13Conducting is with F
15Input draw and be low level, make F
15Be output as 1, through D
14Green tube core LED3-1 to Tricolor LED makes it to send green glow, and LED3-1 passes through resistance R
29Current limliting is to the output of NE555, and this moment, NE555 was in reset mode, and it is output as 0, so can constitute the loop to LED3-1 and LED3-2.In addition, this moment S
3Be output as 0, F
14Be output as 1, through D
15Be added to the red tube core LED3-2 of Tricolor LED, make it to glow, motor is all luminous at prestart three-colour light-emitting Guan Hong, green tube core like this, externally shows orange-colored light.
When electric motor starting, LM
1Be output as 1, F
1Be output as 0, make a M
14Be output as 1, D
13End, to F
15Inoperative, at this moment, S
3Output still is 0, F
14Be output as 1, F
15Be output as 0 LED3-1 is ended, green light is extinguished, at this moment F
14Output is 1 still, passes through D
15To LED3-2, ruddiness is sent in still conducting, so during electric motor starting, the three-colour light-emitting pipe sends ruddiness.
When electric motor starting finishes, owing to still have electric current so LM
1Output still is 1, F
1Be output as 0, M
14Be output as 1, D
13Still end, but this moment S
3Be output as 1, F
14Being output as 0 red tube core LED3-2 extinguishes.F
14Output make F
15Be output as 1, through D
14Make LED3-1 send green glow, thereby Tricolor LED glow green during the motor operate as normal.D
14, D
15Be protection diode, R
31Be isolation resistance.R
29Current-limiting resistance for the three-colour light-emitting pipe.
Reset circuit is analyzed: after motor breaks down, after the electrician discharges fault, press reset button ANF, can reset, ANF meets power supply V
C, V
CThrough ANF to diode D
7, (D
7Be used for potential isolation), again by D
7To D
9～D
12Anode, D
9～D
12Negative electrode is to each trigger S
1～S
4Reset terminal, make S
1～S
4Reset NAND gate M
12, M
13With diode D
8Form automatic reset circuit, can be when motor cuts off the power supply to S
1～S
4(automatic reset circuit is inoperative when breaking down) automatically resets.
Power unit: 220 volts of power supplys through transformer B step-down after bridge piece ID rectification, C
4After the filtering again after integrated voltage stabilizer 7812 voltage stabilizings output+12V voltage as the power supply of this protector.Schematic diagram as shown in Figure 2.
Claims (3)
1, a kind of threephase asynchronous machine protector; by current detection circuit; control circuit is formed, and it is characterized in that: current detection circuit adopts three-phase current-voltage changer, and three electric current-voltage changers that three-phase current-voltage changer is made by annular core are formed.On every annular core, be wound with balance coil (L respectively
0) potential winding (L
2), be installed with primary coil (L in the middle of the annular core
1), (L
1) be serially connected with motor main circuit, can be that a circle also can be multiturn, (L
2) connection control circuit, (L
0) be short-circuited coil, be used for the balance input current at (L
1) the middle magnetic field that produces, three electric current-voltage changers are contained in the housing, and its potential winding is connected into star and is drawn by terminal.
2, threephase asynchronous machine protector according to claim 1 is characterized in that, control circuit has starting curve tracking circuit and starting exclusive circuit, can avoid the asynchronous machine starting current automatically.The starting curve tracking circuit is by R-S trigger (S
2), (S
3) not gate F
9, F
10NAND gate M
7, M
8Form.
3, according to claim 1,2 described threephase asynchronous machine protectors, it is characterized in that can the input and output of three phase electric machine winding respectively with the former limit (L of two identical three-phase alternating current-voltage changers
1) series connection, the potential winding (L of its three-phase alternating current-voltage changer
2) being connected into two stars, the node of two stars connects together as a common node, delivers to the corresponding input of control circuit respectively with the leading-out terminal of other six potential windings, can realize the differential protection of threephase asynchronous.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93117426 CN1032995C (en) | 1993-09-09 | 1993-09-09 | Three-phase asynchronous motor protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93117426 CN1032995C (en) | 1993-09-09 | 1993-09-09 | Three-phase asynchronous motor protector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1085356A CN1085356A (en) | 1994-04-13 |
| CN1032995C true CN1032995C (en) | 1996-10-09 |
Family
ID=4991999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93117426 Expired - Fee Related CN1032995C (en) | 1993-09-09 | 1993-09-09 | Three-phase asynchronous motor protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1032995C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004224B (en) * | 2009-08-31 | 2012-12-12 | 比亚迪股份有限公司 | Three-phase motor phase failure detection system and detection method thereof |
| CN102842894B (en) * | 2012-10-10 | 2015-04-22 | 河南开启电力实业有限公司 | Motor open-phase protection device without auxiliary power supply |
| DE102015004633B4 (en) * | 2015-04-10 | 2017-07-13 | Ellenberger & Poensgen Gmbh | Power distribution system for connection to an AC voltage network |
| CN106207975A (en) * | 2016-08-31 | 2016-12-07 | 哈尔滨前沿电子技术有限公司 | A kind of motor circuit protection system |
| CN114552534B (en) * | 2022-03-07 | 2022-08-02 | 万洋建设集团有限公司 | Construction asynchronous motor starts stifled trouble processing circuit that changes |
-
1993
- 1993-09-09 CN CN 93117426 patent/CN1032995C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1085356A (en) | 1994-04-13 |
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