CN203135388U

CN203135388U - Three-phase motor lacking-phase alarm device

Info

Publication number: CN203135388U
Application number: CN 201320099410
Authority: CN
Inventors: 宋新林; 陈德桂; 王琳; 韩晓东
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-03-05
Filing date: 2013-03-05
Publication date: 2013-08-14
Anticipated expiration: 2023-03-05

Abstract

The utility model relates to a three-phase motor, in particular to a three-phase motor lacking-phase alarm device. The three-phase motor lacking-phase alarm device comprises a lacking-phase detection circuit, an executive circuit, an audio oscillation circuit, a power amplifying circuit and a power cut circuit, wherein the lacking-phase detection circuit is composed of resistors R1, R2, R3, R4, capacitors C1, C2, and a bridge QL, a direct current voltage is output by rectifying of the bridge QL and filtering of the capacitor C2, and added on the executive circuit; the voltage output by the lacking-phase detection circuit controls a relay KM to be electrified and picked up, and furthermore the circuit cutting action of the audio oscillation circuit, the power amplifying circuit and the power cut circuit is furthermore controlled. The three-phase motor lacking-phase alarm device has the following beneficial effects that the strong current and the weak current are isolated by optically coupling, no direction electric connection is present between the strong current and the weak current, the safety is ensured; the alarm circuit does not consume power at the standby state, the electric energy is saved; and the circuit is simple with low cost.

Description

Threephase motor phase shortage warning device

Technical field

The utility model relates to a kind of threephase motor, particularly a kind of threephase motor phase shortage warning device.

Background technology

Threephase motor is in running, and owing to reasons such as power circuit is aging, loose contact, fuse melting cause the power supply phase shortage easily, common is fuse melting mostly.When three phase electric machine has one to break mutually, be exactly that the normal motor race of saying is single-phase, can cause the stator and rotor electric current of motor sharply to raise, motor seriously generates heat, if untimely discovery is cut off the electricity supply, finally meeting is burn-down of electric motor.

Summary of the invention

The purpose of this utility model is exactly the above-mentioned defective that exists at prior art, and a kind of threephase motor phase shortage warning device is provided, and reports to the police in the very first time, and cuts off the electricity supply automatically, and prompting operator on duty on-call maintenance prevents that fault from enlarging.

Its technical scheme is: be made up of lack detection circuit, executive circuit, audio oscillation, power amplification and power supply cut-off circuit, lack detection circuit is by resistance R 1, R2, R3, R4, capacitor C 1, C2, bridge heap QL form, through bridge heap QL rectification, C2 filtering, export a direct voltage, this voltage is added on the executive circuit;

Executive circuit is by resistance R 5, R6, triode V1, V2, V3, diode V4, capacitor C 3, photoelectrical coupler H, relay K M form, voltage by lack detection circuit output, control relay KM gets the electronic adhesive of doing, and then control audio oscillator circuit, power amplification circuit and the action of power supply cut-off circuit;

The audio alarming signal that voicefrequency circuit produces is added to the input of power discharging integrated block TDA2030A through potentiometer RW2, capacitor C 6, and the high-power signal of output makes loudspeaker SP produce loud chimes of doom; And, the power supply of disconnection 380V ac contactor coil C, contactor does not have electricity, and its normally open contact C returns, and disconnects the three phase mains of motor, and motor M is protected;

Wherein, audio oscillator circuit is by resistance R 7, R8, diode V5, V6, potentiometer RW1, RW2, capacitor C 4, C5, the time base integrated package NE555 form; Power amplification circuit is by capacitor C 6, C7, C8, resistance R 9, R10, R11, R12, and power discharging integrated block TDA2030A, loudspeaker SP form; The power supply cut-off circuit is made up of relay K M2, contactor C, and contactor C inserts the 380V power supply by the normally closed contact KM2 of relay.

The beneficial effects of the utility model are: 1, strong, weak electricity does not have the directly contact of electricity through light-coupled isolation between the strong and weak electricity, guarantees safety.2, warning circuit is in not power consumption of holding state, saves energy.3, circuit is succinct, and cost is low.

Description of drawings

Accompanying drawing 1 is circuit connection diagram of the present utility model;

Among the last figure: resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, capacitor C 1, C2, C3, C4, C5, C6, C7, C8, bridge heap QL, triode V1, V2, V3, diode V4, V5, V6, photoelectrical coupler H, relay K M, potentiometer RW1, RW2, time base integrated package NE555, power discharging integrated block TDA2030A, loudspeaker SP, mains switch S, contactor C, motor M, fuse RD1, RD2, RD3.

Embodiment

By reference to the accompanying drawings 1, the utility model will be further described:

Formed by lack detection circuit, executive circuit, audio oscillation, power amplification and power supply cut-off circuit, lack detection circuit is by resistance R 1, R2, R3, R4, and capacitor C 1, C2, bridge heap QL form, through bridge heap QL rectification, C2 filtering, export a direct voltage, this voltage is added on the executive circuit;

Operation principle is: the mains switch S of closed alarm circuit exists, warning circuit is in stand-by state.The normally closed contact KM2 of contactor C by relay inserts the 380V power supply, and its normally open contact C closure realizes the pre-motor power of connecting, this moment closed mains switch K or with motor start-up circuit starter motor, motor enters running status.When causing certain phase (as the U phase) fuse RD1 fusing for a certain reason, lack detection circuit has unbalance voltage output immediately, through bridge heap QL rectification, C2 filtering, export a direct voltage, this voltage is added on the executive circuit, for providing base bias current, triode V1 makes the V1 conducting through resistance R 5, also conducting of the optocoupler that the V1 collector electrode connects (photoelectrical coupler) H, after the optocoupler conducting, direct current 12V power supply is compound transistor V2 by resistance R 6, V3 provides the base stage bias current, thereby make compound transistor V2, the V3 conducting, the relay K M that its collector electrode connects gets the electronic adhesive of doing.After the actuating of relay, its three docking points move simultaneously: a pair of normal opened contact KM1 closure, the audio oscillator circuit that connection is made up of time base integrated package NE555 and the 12V power supply of power amplification circuit, the audio alarming signal that voicefrequency circuit produces is added to input 1 pin of power discharging integrated block TDA2030A through potentiometer RW2, C6, through power amplification, the high-power signal of 4 pin output makes loudspeaker SP produce loud chimes of doom, and prompting the operator on duty note: " motor generation phase shortage "; Another normally closed contact KM2 to relay opens, and disconnects the power supply of 380V ac contactor coil C, and contactor does not have electricity, and its normally open contact C returns, and disconnects the three phase mains of motor, and motor is protected; The normal opened contact KM3 closure of the 3rd pair of relay makes relay realize self-sustaining, even do lack detection circuit like this because the motor power outage is returned, also can not cause motor to send again.Have only fault is got rid of, and press reset button FA, circuit reset, warning circuit just can reenter stand-by state.

Potentiometer RW1 is used for adjusting the height of frequency of oscillation; Potentiometer RW2 is used for adjusting the size of warning volume.Because motor is when normal operation, the three-phase voltage balance, thus circuit not conducting of optocoupler, relay when stand-by state be failure to actuate, so not power consumption of circuit, so the DC power supply of circuit only needs to disconnect the 12-volt dc power supply switch S and gets final product with 12 overhead accumulators of low capacity, releasing warning.

Claims

1. threephase motor phase shortage warning device, it is characterized in that: formed by lack detection circuit, executive circuit, audio oscillation, power amplification and power supply cut-off circuit, lack detection circuit is by resistance R 1, R2, R3, R4, capacitor C 1, C2, bridge heap QL form, through bridge heap QL rectification, C2 filtering, export a direct voltage, this voltage is added on the executive circuit;