CN2208284Y - Six function electronic protector for three phase motor - Google Patents

Abstract

The utility model discloses a six function electronic protector for a three phase motor, comprising an outer shell and a machine core circuit. A control button and an indicating lamp are arranged on the outer shell, and the both sides are provided with lead-in and lead-out jacks. The machine core circuit comprises eleven element circuits. The six function electronic protector for a three phase motor realizes the protection functions of excess voltage, under voltage, locked rotation, overload, electrical leakage, phase failure, etc. The utility model has the advantages of high sensitivity, good reliability and low cost.

Description

Six function electronic protector for three phase motor

The utility model relates to a kind of three phase electric machine six function electronic protectors.

For a long time, for six kinds of defencive functions such as the superpressure that realizes three phase electric machine, under-voltage, stall, overload, electric leakage, the phases failure, need to use many kinds of equipment such as superpressure relay, low-voltage relay, thermal relay, current transformer, earth leakage protective device; these equipment volume are big, power consumption is big; quantity is many, the price height, and sensitivity is low; poor reliability; in recent years, occur the three phase electric machine electronic protector on the market, but existed insufficiency; the circuit complexity, the shortcoming that price is high.

The purpose of this utility model promptly is to overcome the shortcoming of prior art; a kind of three phase electric machine six function electronic protectors are provided, highly sensitive, good reliability; low price has the function of superpressure, under-voltage, electric leakage, stall, overload, six kinds of defencive functions of the phase failure and reduced voltage starting motor concurrently.

The purpose of this utility model reaches by following measure: three motor six function electronic protectors; form by movement circuit and shell; movement circuit is corresponding continuous with each element on the shell by lead; the front of shell is equipped with earth leakage protective test button, Fast starting button; A, B, each under-voltage indicator light of the every phase of C three-phase; A, B, each superpressure indicator light of the every phase of C three-phase; the stall indicator light; the overload indicator light; phase failure indicator light; electric leakage indicator light, the both sides of shell are respectively equipped with the inlet wire jack and go out line jack and relay wiring hole.

Movement circuit comprises 11 element circuits, be power circuit, overpressure protection circuit, rotation-clogging protection circuit, overload protection circuit, leakage protection circuit, diode OR gate circuit, starting delay circuit, Fast starting circuit, open-phase protection circuit, reduced voltage starting relay promote circuit, the running relay promotes circuit, the output that power circuit connects each element circuit, overpressure protection circuit links to each other with reduced voltage starting relay promotion circuit, and interlock changes relay promotion circuit again; The output termination diode OR gate circuit of rotation-clogging protection circuit, promote circuit with the reduced voltage starting relay again and link to each other; The output of overload protection circuit links to each other with the diode OR gate circuit; Leakage protection circuit connects the diode OR gate circuit; Starting delay circuit falls presses starter relay promotion circuit, Fast starting circuit to fall pressure starter relay promotion circuit; The output of open-phase protection circuit links to each other with the diode OR gate circuit.

Fig. 1 is the outside drawing of three phase electric machine six function electronic protectors.

Fig. 2 is the circuit block diagram of three phase electric machine six function electronic protectors.

Fig. 3 is the circuit diagram of three phase electric machine six function electronic protectors.

The utility model will be further described below in conjunction with accompanying drawing

As shown in Figure 1; the front of shell is equipped with earth leakage protective test button 1, Fast starting button 2; A, B, each under- voltage indicator light 3,4,5 of the every phase of C three-phase; A, B, each superpressure indicator light 6,7,8 of the every phase of C three-phase; stall indicator light 9, overload indicator light 10, phase failure indicator light 11; electric leakage indicator light 12, the both sides of shell are provided with inlet wire jack 13 and go out line jack 14 and relay wiring hole 15.

As shown in Figure 2, movement circuit comprises 11 element circuits, and promptly power circuit, voltage protection circuit, rotation-clogging protection circuit, overload protection circuit, leakage protection circuit, diode OR gate circuit, starting delay circuit, Fast starting circuit, open-phase protection circuit, reduced voltage starting relay promote circuit, the running relay promotes circuit; Power circuit connects each element circuit, and the output of voltage protection circuit promotes circuit with the reduced voltage starting relay and links to each other, and connects the running relay again and promotes circuit; The output termination diode OR gate circuit of rotation-clogging protection circuit promotes circuit with the reduced voltage starting relay again and links to each other; The output of overload protection circuit links to each other with the diode OR gate circuit; Leakage protection circuit connects the diode OR gate circuit; Starting delay circuit falls presses starter relay promotion circuit, Fast starting circuit to fall pressure starter relay promotion circuit.

As shown in Figure 3, power circuit is by B ₁, D _1-4, C ₁, IC7812, C ₂Form, power circuit connects external power, and the alternating current of external power is after transformation, rectification, filtering, voltage stabilizing, and output 19V and two groups of DC power supply of 12V are supplied with relay respectively and promoted circuit and various protective circuit.

Voltage protection circuit comprises that the superpressure signal amplifies indicating circuit, by Q ₁, D ₉, R ₁, R ₃, R ₅Deng composition; Superpressure signal phase inverter is by Q ₃, R ₁, R ₄Form; The voltage protection circuits for triggering are by Q ₄, R ₂Form; Voltage sample circuit is by B ₂, D _5-8, C ₃, W ₁, W ₂, C ₄Deng composition; Under-voltage signal amplifies indicating circuit, by Q ₂, R ₂, R ₃, R ₄, D ₁₀Form; Voltage sample circuit under normal circumstances, C ₄On the 6V direct voltage is arranged, this voltage approximates Q ₁And Q ₂Emitter voltage, therefore two Guan Jun are in anti-cut-off state partially, in case supply voltage rises or descends C ₄On will occur one with respect to the positive of former 6V voltage or negative superpressure or under-voltage signal, deliver to Q respectively ₁Or Q ₂Amplify.The superpressure signal amplifies indicating circuit, under normal circumstances, and Q ₁End D ₉Not luminous, in case voltage sample circuit C ₄On superpressure signal output, Q are arranged ₁With regard to conducting, D ₉Little bright, instructed voltage is higher, if this signal continues to increase, and when having surpassed rated value, Q ₁Just enter saturation conduction, D ₉Incandescent, R ₁On voltage drop surge, cause superpressure signal phase inverter Q ₃Conducting is delivered to voltage protection circuits for triggering Q with signal ₄Make it conducting.Under-voltage signal amplifies indicating circuit, under normal circumstances, and Q ₂End D ₁₀Unglazed, in case voltage descends C ₄On when the output of under-voltage signal is arranged, Q ₂Conducting, D ₁₀Little bright, instructed voltage is on the low side, if this signal continues to increase to negative direction, and when having surpassed rated value (that is to say that rated value fell in supply voltage), Q ₂Just enter saturation conduction, D ₁₀Incandescent, R ₂Last voltage drop surge is to voltage protection circuits for triggering Q ₄Conducting is with C ₅On voltage bleed off Q _7-9End, relay discharges, and has realized that voltage is super, function under proteciton.

The rotation-clogging protection circuit comprises the stall indicating circuit, by D ₁₂, R ₉Form; The rotation-clogging protection circuits for triggering are by Q ₆, W ₇Form; The rotation-clogging protection indicating circuit, when the motor normal starting, C ₉On voltage can not make rotation-clogging protection circuit Q ₆Conducting, D ₁₂Can be not luminous yet, only at motor for a certain reason, starting current increases, and has surpassed rated value (by W ₇Set up) time, Q ₆The very fast conducting of meeting, D ₁₂Luminous, and make and door D ₁₁The positively biased conducting is with C ₅On voltage bleed off Q _7-9End, realize the rotation-clogging protection function.

The overload protection circuit comprises current sampling circuit, by B ₃, D _21-24, C ₇Form; Stall target signal filter circuit is by C ₆And W ₅Form; The overload protection circuits for triggering are by Q ₅, W ₅, W ₆, C ₆Form, the overload indicating circuit is by D ₁₃, R ₉Form, current sampling circuit just has correspondingly direct voltage from C when electric motor starting ₇Last output, this voltage is very high second at the 2-3 of starting, and electric motor starting is finished afterwards; when entering normal operation, just lowered, approximated original 1/4-1/7; the overload protection circuit is when the motor normal starting, though electric current greatly to the normal 4-7 that moves doubly, because W ₆And C ₆Existence, this signal has been filtered out, when motor normally moves, C ₆On voltage can not make Q ₅Conducting, D ₁₃Can be not bright, have only because of certain reason, when the motor power consumption increases, Q ₅Just meeting conducting, D ₁₃Glimmer, indication motor is overload a bit, if electric current increases when having surpassed rated value Q again ₅With regard to saturation conduction, D ₁₃Incandescent, Q ₅Collector voltage drops to about 0.8V, D ₁₄The positively biased conducting is with C ₅Powering on presses, Q _7-9End, thereby realize the overload protection function.

Leakage protection circuit comprises the earth leakage protective circuits for triggering, by Q ₁₀Form; The electric leakage indicating circuit is by R ₉, Q ₁₅Form; The earth leakage protective hookup is by R ₂₀, QA ₂Form; The electric leakage signal pick-up circuit is by B ₄, D _19-20, C _8-9And C ₁₅Form, leakage protection circuit, under normal circumstances, the electric leakage signal pick-up circuit is provided with voltage output, reaches about 30mA C in case electric leakage takes place ₉On just have the output of high direct voltage, trigger controllable silicon Q ₁₀Conducting, thereby D ₁₅Luminous (incandescent), D ₁₆The positively biased conducting is with C ₅Power on and press Q _7-9End, thereby realize creepage protection function.

The diode OR gate circuit is by D ₁₁, D ₁₄, D ₁₆, D ₂₆Form, starting delay circuit is by R ₈, W ₃, C ₅Form, the Fast starting circuit is by R ₈, QA ₁Form.

Open-phase protection circuit comprises the diode OR gate circuit, by D ₂₇* 3 and Q ₁₁Form, phase failure signal inverting amplifier circuit is by Q ₁₂, W ₈, R ₁₇, R ₁₅, R ₁₆, C ₁₂Form, the open phase protection circuits for triggering are by Q ₁₃, D ₁₇Form, phase failure indicating circuit is by R ₉And D ₂₅Form, phase failure signal pickup circuit is identical with current sampling circuit, by R ₃, D _21-24, C ₇Form, the phase failure signal of open-phase protection circuit is supplied with by current sampling circuit, and when motor normally moved, the current sampling circuit of A, B, C three-phase had identical direct voltage output, and this voltage definitely is higher than Q ₁₁Emitter voltage, so D in the NOR gate ₂₇* 3 all are in instead partially Q ₁₁Base stage also is in partially anti-, so Q ₁₁Emitter does not have negative signal output, Q ₁₂Keep conducting state, Q ₁₂Collector electrode keeps electronegative potential, Q ₁₃Be in cut-off state, suppose that C is disconnected mutually among A, B, the C, the current sampling circuit of C phase does not just have positive voltage output, the corresponding D in the diode NOR gate circuit so ₂₇Just pass through W ₇Introduce negative voltage, thereby make Q ₁₁Conducting, its emitter output electronegative potential, thereby Q ₁₂Base stage also is electronegative potential, makes Q ₁₂End, from its collector electrode output high potential, Q ₁₃The conducting that is triggered has realized open phase protection, meanwhile, and D ₂₅Luminous, the indication motor phase shortage, this protection must be cut off the power supply protection, after open phase fault is got rid of, logical again powering on, protector could recover operate as normal.What need here to further specify is after the protector energising, before the motor unstart still, because Q ₁₃Trigger voltage from Q ₁₆Collector electrode, from figure, Q ₁₆In case conducting, Q ₁₇Inevitable conducting, J ₂With regard to adhesive, motor changes normal operation, D over to ₂₇Just be in anti-cut-off state partially, and because C ₁₂And R ₁₅Existence, Q ₁₂The positive voltage of collector electrode wants the back in the arrival of its base voltage, treats in its arrival Q ₁₂Be in conducting state already, so needn't worry Q ₁₃Touch work.

The reduced voltage starting relay promotes circuit by Q ₁₄, Q ₁₅, Q ₁₈, R ₁₀, R ₁₁, R ₁₂Form; The running relay promotes circuit by Q ₁₆, Q ₁₇, Q ₁₉, W ₄, C ₁₀, R ₁₃, R ₁₄Form, after the protector energising, cross about 5 minutes (adjustable) C ₅On voltage make Q ₁₄, Q ₁₅Conducting triggers Q ₁₈Conducting, J ₁Adhesive drives J ₃Adhesive, motor utilize the J4 normally-closed contact, are star connection, have realized reduced voltage starting, again because C ₁₀And W ₄Existence, R ₁₀On voltage drop to could arrive Q after (adjustable) through time-delay ₁₆Base stage make it conducting, thereby through Q ₁₇, R ₁₄Trigger Q ₁₉, make J ₂Adhesive drives J ₄Also adhesive, J ₄Normally-closed contact disconnects, and makes motor become delta-connection, enters normal operating conditions.

Can find out by top narration, the utlity model has following advantage: multiple functional, highly sensitive, strong interference immunity, the automaticity height, voltage protection function, normal as long as voltage recovers, protector can automatically terminate protection, gets back to normal operating conditions; To the delta-connection motor; can automatically carry out star, angle reduced voltage starting; except earth leakage protective and open-phase protection, the time of all the other various defencive functions and protection domain and delayed firing can be appointed accent (as long as within maximum energising limit of power of protection), and cost is low.

Claims (1)

1, a kind of three motors, six function electronic protectors, form by movement circuit and shell, movement circuit is corresponding continuous with each element on the shell by lead, it is characterized in that: the front of shell is equipped with earth leakage protective test button (1), Fast starting button (2), A, B, each under-voltage indicator light (3) of the every phase of C three-phase, (4), (5), A, B, each superpressure indicator light (6) of the every phase of C three-phase, (7), (8), stall indicator light (9), overload indicator light (10), phase failure indicator light (11), electric leakage indicator light (12), the both sides of shell are respectively equipped with inlet wire jack (13) and go out line jack (14), relay wiring hole (15);

Movement circuit comprises 11 element circuits, be power circuit, voltage protection circuit, rotation-clogging protection circuit, overload protection circuit, leakage protection circuit, diode OR gate circuit, starting delay circuit, Fast starting circuit, open-phase protection circuit, reduced voltage starting relay promote circuit, the running relay promotes circuit, power circuit connects each element circuit, the output of voltage protection circuit promotes circuit with the reduced voltage starting relay and links to each other, and connects the running relay again and promotes circuit; The output termination diode OR gate circuit of rotation-clogging protection circuit promotes circuit with the reduced voltage starting relay again and links to each other; The output of overload protection circuit links to each other with the diode OR gate circuit; Leakage protection circuit connects the diode OR gate circuit; Starting delay circuit falls presses starter relay to promote circuit, and the Fast starting circuit falls presses starter relay to promote circuit; The output of open-phase protection circuit links to each other with the diode OR gate circuit.

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