CN2147671Y - Overload protector for motor phase losing - Google Patents
Overload protector for motor phase losing Download PDFInfo
- Publication number
- CN2147671Y CN2147671Y CN 93200336 CN93200336U CN2147671Y CN 2147671 Y CN2147671 Y CN 2147671Y CN 93200336 CN93200336 CN 93200336 CN 93200336 U CN93200336 U CN 93200336U CN 2147671 Y CN2147671 Y CN 2147671Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- overload
- phase
- voltage
- motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Protection Of Generators And Motors (AREA)
Abstract
The utility model relates to an overload protector for motor phase interruption, which is composed of a three-phase power supply, a detecting circuit, a control circuit, a motor, a protective circuit of phase interruption and an overload protective circuit. The protective circuit of phase interruption is composed of a current transformer, a voltage regulation and voltage stabilization device, a relay and a controlled silicon which is reversely connected in parallel, and the overload protective circuit is composed of a current transformer, a bidirectional thyristor, a delay conduction circuit and a relay. The utility model has the advantages of convenient setting, accurate overload protection and universality of 0.6-100KW, and the utility model is provided with a running state light display function to make the operation and control convenient.
Description
The utility model relates to motor protecting device, particularly about the automatic safety device of the threephase motor phase failure and overload.
Existing motor protector, of a great variety, there is the thermal relay of employing to make overcurrent protective device, it is influenced by ambient temperature big, and its setting current is difficult for adjusting on the fixed ideal position of weighing apparatus.Also have and adopt the PTC temperature-sensitive element to make overload protection, but it must be produced on motor windings in advance, be difficult to realize easy installing and using for existing motor.CN2078501 and CN2071839 have proposed the improvement to motor protecting device, but still exist setting current to be difficult to be adjusted in the fixed ideal position of weighing apparatus, and the little defective of adaptability scope.
The purpose of this utility model is that a kind of adaptability scope of design is big, adjusts easy, the easy motor automatic safety device of installation.
The utility model is realized with following technical proposals.
Motor overload of loss of phase protector, it comprises three phase mains, testing circuit, control circuit and motor, it is characterized in that: the open phase protection testing circuit is in series by current transformer circuit and voltage-regulation voltage-stabilization bidirectional triode thyristor circuit; Phase-failure protection control circuit is in series by a relay circuit and reverse parallel connection one-way SCR; The overload protection control circuit is in series by voltage-regulation voltage-stabilization bidirectional triode thyristor circuit, delay turn-on circuit and another relay circuit.
The advantage of such scheme is that the utility model adapts to the motor of various different capacities; can use motor power (output) to select the iron core of different instrument transformers respectively according to reality; and need not to select for use the overload of loss of phase protector of different model and structure according to different motor power (output)s; be that this protective device is easy to adjust again; because the overload protection control circuit is provided with voltage-regulation voltage-stabilization bidirectional triode thyristor circuits for triggering; it is accurately adjustable that overload protection is realized, thereby guarantee the motor safe operation.This protector also has running status light to show in addition, is convenient to operation and control.
Fig. 1 is the utility model circuit structure block diagram.
Fig. 2 is a circuit diagram of the present utility model.
Each several part structure division is as follows among the above-mentioned figure:
1 is current transformer circuit, by L
1, L
2, L
33 current transformers are composed in series.
2 is the overload signal current rectifying and wave filtering circuit, by rectifier bridge D
1, capacitor C
1Form.
3 is overload signal voltage-regulation voltage-stabilization bidirectional triode thyristor circuits for triggering, by potentiometer W
2, voltage stabilizing didoe D
3, capacitor C
2, voltmeter V, bidirectional triode thyristor VS
2Form.
4 is the overload signal delay turn-on circuit, by potentiometer W
3, capacitor C
3, voltage-stabiliser tube D
4, triode BG
1, BG
2And resistance R
3Form.
5 is the overload signal relay circuit, by relay J
1, diode D
7, LED
1And resistance R
1Form.
6 are phase failure signal voltage-regulation voltage-stabilization bidirectional triode thyristor circuits for triggering, by potentiometer W
1, voltage stabilizing didoe D
5, D
6With bidirectional triode thyristor VS
1Form.
7 are the transformation rectification filtering voltage stabilizing circuit of phase failure signal, by transformer B, rectifier bridge D
2, integrated package of pressure-stabilizing 7812, capacitor C
5, C
6Form.
8 are phase failure signal relay circuit, by relay J
2, capacitor C
4, LED
2, resistance R
2, R
4Form.
9 for phase failure signals reverse one-way SCR circuit in parallel, by controllable silicon T
1, T
2And J
2-1, J
R4The contact is formed.
10 is by controlled motor D.
The course of work and the major function of embodiment are described below in conjunction with accompanying drawing.
The three-phase electricity input of motor D inserts current transformer L
1, L
2, L
3(1) export the input that a, b end is phase failure detector after the secondary series connection with current transformer, another exports a
1, b
1End is the input of overload protection detector.This protector is pressed starting button TA after inserting main power circuit by Fig. 2.Contactor J
RGet electric adhesive, JR
1～JR
4Closure, motor D gets electric operation, L
1, L
2, L
3Current transformer produces corresponding induced electromotive force, owing to be in series each other, 3 subharmonic electromotive force equal and opposite in directions, the direction of their inductions are identical, and current rectifying and wave filtering circuit (2) and voltage-regulation voltage-stabilization bidirectional triode thyristor circuits for triggering (3) are delivered in output respectively, leads up to W
1Dividing potential drop is that the AC signal of 1-2V adds to VS
1Negative electrode with control the utmost point, voltage-stabiliser tube D
5, D
6W is regulated in voltage stabilizing
1Make VS
1Conducting, signal code is through B transformation, D
2Rectification, three-terminal voltage-stabilizing pipe 7812 output 12V direct currents make relay J
2Adhesive, LED
2Bright, J
2-1The closing of contact makes reverse parallel connection controllable silicon T
1, T
2The control utmost point connect A.C. contactor J
RKeep adhesive, motor runs well.If an outage is mutually wherein arranged, it is 0 that the current transformer triggering signal is cancelled out each other, and makes VS
1End transformer B dead electricity, relay J
2And LED
2Also dead electricity, J
2-1The contact disconnects, T
1And T
2End A.C. contactor J
RInterlocking contact JR
1, JR
2, JR
3, JR
4Cut off the motor stall.
The output signal on another road of current transformer is passed through D from a1, b1 input
1And C
1To W
2Two ends, the motor operation is normal, and motor seriously generates heat, when electric current fails to exceed load current value, should be with potentiometer W
2Transfer counterclockwise, make voltmeter V pointer enter green area, the triggering signal that is about to transship drops to about 0.5V, makes VS
2End, motor keeps normal operation.
When electromotor overload or stall, the output of current transformer overload signal increases, through D
1Rectification, C
1Filtering adds to potentiometer W
2Carry out dividing potential drop, D
3Voltage stabilizing, C
2Be used to prevent High-frequency Interference, and the voltmeter V that connects is convenient to regulate the controllable silicon normally, when voltmeter V pointer when the Green Zone enters red sector, promptly when voltage exceeds 0.7V, controllable silicon VS
2Conducting is electromotor overload or stall constantly, by potentiometer W
3Give capacitor C
3Charging, through 10-20 after second, C
3Current potential raises, when voltage reaches 5V, and voltage-stabiliser tube D
4Puncture, by BG
1, BG
2Form the multiple tube conducting, relay J
1Must be electric, make J
1-1Adhesive, LED
1Bright, make J
1-2Disconnect relay J
2The circuit dead electricity, J
2-1Disconnect, make A.C. contactor J
RDisconnect, make J
R1～J
R4Discharge, thereby cut off motor power, finish the function of motor overload protection.C
4Be attempted by relay J
2Two ends pass through C
4Discharge and recharge and make J
2Time-delay 1-2 disconnects or closure function second.Charging capacitor C
3Discharge when started next time, can keep time-delay accurately.
Claims (6)
1, motor overload of loss of phase protector, it comprises three phase mains, testing circuit, control circuit and motor, it is characterized in that:
A. the open phase protection testing circuit is in series by electric current mutual inductance circuit (1) and voltage-regulation voltage-stabilization bidirectional triode thyristor circuit (6);
B. phase-failure protection control circuit is in series by phase failure signal relay circuit (8) and reverse parallel connection one-way SCR circuit (9);
C. the overload protection control circuit is in series by voltage-regulation voltage-stabilization bidirectional triode thyristor circuit (3), delay turn-on circuit (4) and overload signal relay circuit (5).
2, electronic overload of loss of phase protector as claimed in claim 1 is characterized in that open-phase detection circuit is by 3 current transformer L
1, L
2, L
3Series connection back and potentiometer W
1Parallel connection, potentiometer W
1Output and bidirectional triode thyristor VS
1The trigger electrode serial connection, voltage-stabiliser tube D
5, D
6Be attempted by potentiometer W
1With bidirectional triode thyristor VS
1Between.
3, motor overload of loss of phase protector as claimed in claim 1 is characterized in that phase-failure protection control circuit is by relay J
2, triode BG
3, diode D
7, capacitor C
4, LED
2, resistance R
4With one-way SCR T in parallel
1, T
2Form.
4, motor overload of loss of phase protector according to claim 1 is characterized in that overload signal voltage-regulation voltage-stabilization bidirectional triode thyristor circuit is by potentiometer W
2, voltage stabilizing didoe D
3, capacitor C
2, voltmeter V and controllable silicon VS
2Form.
5, motor overload of loss of phase protector according to claim 1, the delay turn-on circuit that it is characterized in that overload signal is by position device W
3, capacitor C
3, voltage-stabiliser tube D
4, triode BG
1, BG
2And resistance R
3Form.
6, motor overload of loss of phase protector according to claim 1 is characterized in that the overload signal relay circuit is by relay J
1, diode D
7, LED
1And resistance R
1Form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93200336 CN2147671Y (en) | 1993-01-03 | 1993-01-03 | Overload protector for motor phase losing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93200336 CN2147671Y (en) | 1993-01-03 | 1993-01-03 | Overload protector for motor phase losing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2147671Y true CN2147671Y (en) | 1993-11-24 |
Family
ID=33785127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93200336 Expired - Fee Related CN2147671Y (en) | 1993-01-03 | 1993-01-03 | Overload protector for motor phase losing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2147671Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101501799B (en) * | 2006-08-15 | 2012-02-15 | Abb技术有限公司 | Signal generation unit and method to generate a data signal in a control unit of a power system device |
-
1993
- 1993-01-03 CN CN 93200336 patent/CN2147671Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101501799B (en) * | 2006-08-15 | 2012-02-15 | Abb技术有限公司 | Signal generation unit and method to generate a data signal in a control unit of a power system device |
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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 |