CN2274832Y - Protector for IC motor - Google Patents

Abstract

The utility model relates to a protector for a motor. The utility model is characterized in that after a current signal which is obtained by a three-phase induction coil is processed and amplified by an integrated circuit, the current signal triggers controllable silicon; the normally closed contact of the relay of an actuating mechanism is caused to open, controlling a motor to cut power. Thus, the goal of protecting the motor is achieved. The utility model which has the advantages of safe performance, strong reliability, low power consumption, large range of power supply, convenient power connection and repair, and low cost is an ideal protecting device for overloading and phase interruption of motors.

Description

Novel I C motor protector

A kind of novel I C motor protector belongs to the improvement of electromotor overload and off line protective device.

For many years, in order to overcome the problem that motor is former because of overload and the phase failure etc. thereby burn out, people have taked the way protected with various relays, still not thorough solution.Occurred some in recent years again and protected with the circuit engineering that discrete component adds integrated circuit (IC) design, but wherein also had weak point, as the long-term saturation conduction of triode in the phase failure control, power consumption is big, damages easily; Power supply need adopt transformer-supplied, and grid stability is required height, the cost height, and the controller volume is bigger, is difficult for installing.

The purpose of this utility model provides that a kind of reaction speed is fast, and power consumption is little, the protector advanced technology, and stable performance, cost is low, and installation and maintenance are novel I C motor protector very easily all.

Scheme of the present utility model is achieved in that this motor protector control circuit is made up of circuit such as power supply, sampling, signal processing, actuator and faulty indication, feature of the present utility model be electric network source behind diode rectification, resistance current limliting and capacitor filtering for the controller electricity consumption; Obtain current signal by the three-phase induction line chart and behind diode rectification, capacitor filtering, electric resistance partial pressure, send into processing amplification circuit IC, handle amplifying signal through integrated circuit (IC) and send into the actuator that constitutes by controllable silicon, relay, and cut off the power supply by the relay normally closed contact control motor of actuator.

The utility model motor protector adopts an integrated circuit, makes the circuit reaction speed fast, and power consumption is little, does not generate heat, and security performance is good.No power supply transformer, power range is wide, and it is convenient to connect electricity, and cost is low.Establish failure indicating circuit simultaneously, when induction-motor load was excessive, the overload protection indicator light was luminous; When the motor phase failure, outage phase indicator light is luminous, has indicated the fault point, provides convenience to maintenance work.

The utility model motor protector has following accompanying drawing

Fig. 1 is the utility model motor protector control circuit schematic diagram.

Fig. 2 is the utility model motor protector motor main control circuit schematic diagram.

How further narrate the utility model below in conjunction with accompanying drawing realizes.

The utility model motor protector is made up of circuit such as power supply, sample of signal, signal processing, actuator and faulty indication, and described power unit comprises rectifier diode D ₁₁, current-limiting resistance R ₁₂, R ₁₃, D ₁₀, filter C ₅, R ₉, and R ₈Described sample circuit comprises induction by current line chart B ₁, B ₂, B ₃, diode D ₁, D ₂, D ₃, capacitor C ₁, C ₂, C ₃, resistance R ₁, R ₂, R ₃, R ₄, R ₅And R ₆Wherein the overload protection sampling comprises diode D ₄, D ₅, VR, C ₄With triode BG ₁, resistance R ₇Described signal processing circuit comprises integrated circuit (IC) and diode D ₆, D ₇, D ₈And D ₉Described actuator comprises controllable silicon D ₁₂, relay J and diode D ₁₃, capacitor C ₆Described indicating circuit comprises triode BG ₂, BG ₃, resistance R ₁₀, R ₁₁With light-emitting diode D ₁₄, D ₁₅Power unit is got two phase firewires and is done power supply, through diode D ₁₁Rectification, current-limiting resistance R ₁₂Dividing potential drop, diode D ₁₀Voltage stabilizing, resistance R ₉Dividing potential drop, capacitor C ₅Connecting resistance R after the filtering ₈With 4 pin of integrated circuit (IC), diode D ₁₀, capacitor C ₅And resistance R ₉Another termination common port; Induction coil B in the sampling circuit ₁, B ₂, B ₃Output signal one tunnel is respectively through D ₁, D ₂, D ₃Rectification is through C ₁, C ₂, C ₃Filtering, resistance R ₁, R ₂, R ₃2,6,9 pin that divide crimping signal processing circuit IC, C ₁, C ₂, C ₃, R ₁, R ₂, R ₃Other end ground connection, treated amplifying signal meets D respectively by the output of 1,7,8 pin of IC ₇, D ₆, D ₉, its output termination controllable silicon D of actuator ₁₂The control utmost point and indicating circuit triode BG ₃Base resistance one end, BG ₃Emitter and light-emitting diode D ₁₄Connect light-emitting diode D ₁₄Output connects common port; Executive circuit controllable silicon D ₁₂Coil one end of output relay termination J, the relay coil other end is through current-limiting resistance R ₁₃Connect power supply, diode D ₁₃The protection controllable silicon is not by anti-phase puncture; The normally closed contact of relay J is gone into the control loop of main circuit contact device coil.The sampling of indicating circuit is by induction ring formation B ₂, B ₃Output termination rectifier diode D ₄, D ₅Be connected on the end of potentiometer VR after the rectification, delay capacitor C ₄One termination potentiometer output, other end ground connection; Potentiometer VR output termination BG ₁Base stage, BG ₁Collector electrode meet BG ₂Base stage and 13 pin that connect integrated circuit (IC) as overload signal, BG ₂Collector electrode sending and receiving optical diode D ₁₅, D ₁₅Output connect common port.

The electronic protector of the utility model is like this work: normally closed contact a, the b of the relay J by protector inside give main circuit contact device coil power supply, utilize the auxiliary normal opened contact 2 of contactor to the protector power supply, and supply voltage is 380 volts of two-phases.During the contactor adhesive, protector gets electric, and protector did not have when contactor disconnected.Three-phase power line is penetrated three induction coil B of protector respectively ₁, B ₂, B ₃Behind the magnetic core hole, be connected on the contactor.

When the contactor adhesive, during electric motor normal working, there is electric current to pass through in the induced magnetism hole, the induction line chart produces induced current, through diode D ₁, D ₂, D ₃Rectification, capacitor C ₁, C ₂, C ₃Filtering, voltage is by current-limiting resistance R ₄, R ₅, R ₆Be added to input 2,6,9 pin of integrated circuit (IC).This moment, output 1,7,8 pin separately were zero potential, and SCR control utmost point no-voltage is in cut-off state, not adhesive of relay, and contactor is in normal operating conditions.

When contacts of contactor loose contact or a certain when cutting off the power supply mutually, to respond to no current accordingly and produce, the input 2,6 or 9 of integrated circuit (IC) be an electronegative potential, any is high level for certain of corresponding output 1,7 or 8 pin, by isolating diode D ₇, D ₆Or D ₉Be added to controllable silicon D ₁₂The control utmost point, controllable silicon D ₁₂Conducting, the relay J coil electricity, the relay J adhesive, normally closed contact a, b open, and cut off the contactor coil power supply, and contactor separates, and cuts off motor power.

When electromotor overload or damage of bearings were stuck, motor increased because of above former thereby electric current, and the corresponding increase of induced current is by diode D ₄, D ₅Rectification is added to triode BG through potentiometer VR ₁Base stage, this moment, base potential rose, BG ₁Conducting, the input 13 pin voltages of integrated circuit (IC) descend, and output 14 pin voltages rise, diode D ₈Conducting triggers controllable silicon D ₁₂, the relay J adhesive, its normally closed contact a, b open and cut off the contactor coil power supply, and contactor separates, and cuts off motor power, the protection motor.Wherein potentiometer VR can be according to the starting of motor power (output) size adjustment, time-delay and overload protection value.

The phase failure of the present utility model, overload indicating circuit are work like this: when the phase failure, a phase failure signal part triggers controllable silicon D ₁₂, signal passes through resistance R simultaneously ₁₀Be added to triode BG ₃Base stage, make BG ₃Conducting, light-emitting diode D ₁₄It is once bright to get electric back, and expression is an open phase fault.

When electromotor overload, overload signal passes through D ₄, D ₅Potentiometer VR and BG ₁Be added to BG ₂Base stage, BG ₂Conducting, light-emitting diode D ₁₅It is once bright to get electric back, and expression is an overload fault.BG ₁Integrated circuit (IC) input 13 pin are inserted on another road of collector signal, and 14 pin current potentials raise, through diode D ₈Trigger controllable silicon D ₁₂

Claims (2)

1, a kind of novel I C motor protector is made up of power unit, sample circuit, signal processing, actuator and the indicating circuit etc. of circuitry, and it is characterized in that: described power unit comprises rectifier diode D ₁₁, current-limiting resistance R ₁₂, R ₁₃, voltage stabilizing didoe D ₁₀, filter capacitor C ₅And R ₉And R ₃Described sample circuit comprises induction by current coil B ₁, B ₂, B ₃, diode D ₁, D ₂, D ₃, capacitor C ₁, C ₂, C ₃, resistance R ₁, R ₂, R ₃, R ₄, R ₄And R ₆, overload protection sample circuit diode D wherein ₄, D ₅, potentiometer VR and triode BG ₁, resistance R ₇Described signal processing circuit comprises integrated circuit (IC) and diode D ₆, D ₇, D ₈And D ₉Described actuator comprises controllable silicon D ₁₂, relay J and diode D ₁₃, capacitor C ₆Described indicating circuit comprises triode BG ₂, BG ₃, resistance R ₁₀, R ₁₁With light-emitting diode D ₁₄, D ₁₅

2, novel I C motor protector according to claim 1, it is characterized in that: power unit is got two-phase as power supply, through diode D ₁₁Rectification, current-limiting resistance R ₁₂Dividing potential drop, diode D ₁₀Voltage stabilizing, capacitor C ₅Filtering, resistance R ₉Meet R after the dividing potential drop ₈4 pin with integrated circuit (IC); Induction coil B in the sample circuit ₁, B ₂, B ₃Output signal one tunnel is through D ₁, D ₂, D ₃Rectification is through resistance R ₄, R ₅, R ₆Insert 2,6,9 pin of signal processing circuit IC respectively, handle amplifying signal through IC and receive D respectively by 1,7,8 pin ₆, D ₇, D ₉Input, its output termination controllable silicon D of actuator ₁₂The control utmost point and indicating circuit triode BG ₃Base resistance one end, BG ₃Emitter sending and receiving optical diode D ₁₄, collector electrode connects power supply; Executive circuit controllable silicon output relay termination J coil one end, the coil other end is through current-limiting resistance R ₁₃Connect power supply; The normally closed contact of relay J is connected in series in the control loop of main circuit contact device; Indicating circuit from induction line chart B ₂, B ₃Output is obtained signal and is met rectifier diode D ₄, D ₅Receive potentiometer VR one end after the rectification, potentiometer VR output meets BG ₁Base stage, delay capacitor C ₄One termination potentiometer VR output, other end ground connection; BG ₁Collector electrode one tunnel meet BG ₂Base resistance one end, BG ₂Emitter connect power supply, collector electrode sending and receiving optical diode D ₁₅BG ₁Another road of collector electrode connects 13 pin of integrated circuit (IC), is added to controllable silicon D by the output of 14 pin ₁₂The control utmost point.

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