CN106026345A

CN106026345A - Anti-interference device of motor

Info

Publication number: CN106026345A
Application number: CN201610541061.8A
Authority: CN
Inventors: 李多山; 陶苗苗
Original assignee: Hefei Lianxin Power Supply Co Ltd
Current assignee: Hefei Lianxin Power Supply Co Ltd
Priority date: 2016-07-11
Filing date: 2016-07-11
Publication date: 2016-10-12
Anticipated expiration: 2036-07-11
Also published as: CN106026345B

Abstract

The invention provides an anti-interference device of a motor. The device comprises an input circuit breaker, a rectifier, a diode, a free-wheeling capacitor, an inverter, a transformer and a thyristor. In the control circuit of a motor starting and stopping main circuit, when city power interference occurs, the thyristor is turned on, and the inverter carries out inversion and outputs alternating current with the same frequency, amplitude and phase as city power before power interference. After city power interference, the device controls the inverter output within time less than 2ms, which ensures continuous closing of a contactor of the control circuit. The motor can continue normal operation. According to the invention, through power supply of the inverter circuit, the voltage of the motor control circuit is not disturbed by external power interference; and heavy loss of industrial production can be avoided.

Description

A kind of voltage-sag prevention device of motor

Technical field

The present invention relates to electricity field, the equipment belonging between AC and DC, mutually changing between direct current and exchange, specifically A kind of voltage-sag prevention device of motor.

Background technology

Along with the development of society, people are more and more obvious to the demand of electric power, and some industrial occasions are to electric power Relying on increasing, and motor is chemical industry quantity-produced visual plant, each voltage pulsation (is shaken Electricity) the continuous production of the properly functioning of motor and chemical plant installations will be directly affected.Existing motor control mode is general All over using stop-and-go-guarantor to control loop, its cardinal principle is from motor main circuit, draws and controls power supply, so Afterwards by start button, loop, stop button is kept motor to be started, run, shut down control.

The shortcoming of existing apparatus is easily affected by major loop with the not enough loop that mainly controls, the control loop of motor Part contact device be alternating current 220V control voltage, when system voltage be short-circuited fault or flashover electric discharge, cause When " shaking electric ", line voltage will reduce rapidly, when line voltage is less than 70%, operate line in control circuit Enclose because suction unshakable in one's determination being less than the elastic force of release spring and not adhesive, cause catalyst device dead electricity to disconnect, make Become motor stopping, cause heavy losses to commercial production.

Summary of the invention

A kind of voltage-sag prevention device of motor that the present invention provides, when there is " shaking electric " situation, this device will not Cause the power-off that motor is unexpected, and bring great loss to commercial production.

The purpose of the present invention can be achieved through the following technical solutions:

A kind of voltage-sag prevention device of motor includes the second input circuit breaker Q F2, commutator U, diode FD, afterflow Electric capacity C, inverter UI, transformator T, the second IGCT JZG2, output circuit breaker Q F.

Civil power input L1 phase is connected with the input of described commutator U by described second input circuit breaker Q F2, One outfan of described commutator U connects the anode of described diode FD, and the negative electrode of described diode FD is even Connecing an input of described inverter UI, another outfan of described commutator U connects described inverter UI Another input, two inputs of described afterflow electric capacity C and described inverter UI are connected, described inverter The outfan of UI is connected with described second IGCT JZG2 by described transformator T, described second IGCT JZG2 is connected with described output circuit breaker Q F.

Described commutator U, will be converted to unidirectional current by the AC energy of the second input circuit breaker Q F2.

Described afterflow electric capacity C, is connected in parallel on the two ends of inverter, plays the effect of filtering, by whole for rectified device U Unidirectional current after stream is filtered.

Described inverter UI, is converted to alternating current by the afterflow filtered unidirectional current of electric capacity C.

Described transformator T, by the alternating current after inverter UI inversion through boosting, reaches to control loop Middle contactor coil continues the voltage of adhesive.

Beneficial effects of the present invention: a kind of voltage-sag prevention device of motor, when running into " shaking electric ", passes through inversion The power supply of circuit, solves the halting problem in the case of motor " shakes electric ", has ensured the safety of visual plant, There is great economic benefit and safety benefit.

Accompanying drawing explanation

For the ease of it will be appreciated by those skilled in the art that the present invention is further illustrated below in conjunction with the accompanying drawings.

Fig. 1 is three phase electric machine start and stop main circuit diagram of the present invention；

Fig. 2 is three phase electric machine starting or stopping control circuit figure of the present invention.

Detailed description of the invention

A kind of voltage-sag prevention device of motor, when when civil power is short-circuited fault or flashover electric discharge, causing " shake electricity ", The power supply by inverter circuit of this device, solves the halting problem in the case of motor " shakes electric ".

As it is shown in figure 1, three phase electric machine start and stop main circuit include civil power input L1 phase, civil power input L2 phase, Civil power input L3 phase, the first input circuit breaker Q F1, catalyst KM, motor M, as in figure 2 it is shown, three-phase Motor starting or stopping control circuit include civil power input L1 phase, the first IGCT JZG1, the second IGCT JZG2, Second input circuit breaker Q F2, commutator U, diode FD, afterflow electric capacity C, inverter UI, transformator T, Catalyst KM, coil KM, output circuit breaker Q F, wherein, anti-shake electric installation includes the second input chopper QF2, commutator U, diode FD, afterflow electric capacity C, inverter UI, transformator T, the second IGCT JZG2.

In three phase electric machine start and stop main circuit, civil power input L1 phase, civil power input L2 phase, civil power input L3 communicate Crossing the first input circuit breaker Q F1 to be connected with catalyst KM, catalyst KM connects motor M；Three phase electric machine start and stop In control circuit, civil power input L1 is connected one end of the first IGCT JZG1 connect the second input chopper One end of QF2, the other end of the second input circuit breaker Q F2 connects the input of commutator U, commutator U's One outfan is connected to an input of inverter UI by the negative electrode of diode FD, another of commutator U Outfan is connected with another input of inverter UI, connects one between two inputs of inverter UI Afterflow electric capacity C, the outfan of inverter UI is connected by transformator T and the second IGCT JZG2, and second is brilliant Brake tube JZG2 is connected to the node between the first IGCT JZG1 and catalyst KM by output circuit breaker Q F On, start button SA1 is in parallel with catalyst KM, and catalyst KM passes sequentially through stop button SA2, catalyst Coil KM corresponding for KM is connected with zero line.

When civil power is normal, in the control loop of civil power input L1 phase, after being manually pressed by start button SA1, Coil KM obtains electric adhesive, makes the catalyst KM in corresponding major loop and the catalyst KM Guan Bi controlled in loop, Whole circuit be closed under state by civil power input L1 phase, civil power input L2 phase, civil power input L3 phase the One input circuit breaker Q F1, then the catalyst KM under the state of Guan Bi, power to motor M, make motor Properly functioning, now control in loop, it is brilliant that civil power input L1 phase one tunnel passes sequentially through first under conducting state Catalyst KM under brake tube JZG1 and closure state, is connected to ground finally by zero line N, and another road is through closing After the second input circuit breaker Q F2 under conjunction state, becoming unidirectional current through commutator U1, this unidirectional current passes through Afterflow electric capacity C filters, and filtered unidirectional current is converted into alternating current by inverter UI, after through transformator T boosts.In this process, inverter UI passes through synchronized sampling circuit tracing civil power, and now, second is brilliant Brake tube JZG2 turns off, and inverter UI does not exports.

When there is shaking electricity in civil power, device detect line voltage as little as below 180V more than 2ms, and quickly Judging, the first IGCT JZG1 turns off, and the second IGCT JZG2 conducting, inverter UI inversion exports With there is not shaking the civil power before electricity with frequency, with the alternating current of width and homophase, export through the second IGCT JZG2, By output circuit breaker Q F, powering motor M, coil KM is only had the power-off time of 2ms by this process, The time interior loop KM1 adhesive of power-off will not disconnect, and corresponding catalyst KM continues to close, thus motor M Can continue to run well.

When city power recovery voltage, the second IGCT JZG2 continues conducting, and the first IGCT JZG1 is from shutoff State becomes conducting state, and inverter UI and civil power are powered for motor M simultaneously, then the second IGCT JZG2 Turn off；It is the state that motor M powers that whole circuit is restored to civil power.

In the control circuit of civil power input L1 phase, when being manually pressed by stop button SA2, coil KM loses Electricity, corresponding catalyst KM disconnects, and motor M shuts down.

Above content is only the design example to the present invention and explanation, the skill of affiliated the art Described specific embodiment is made various amendment or supplements or use similar mode to replace by art personnel In generation, without departing from the design of invention or surmount scope defined in the claims, this all should be belonged to The protection domain of invention.

Claims

1. a voltage-sag prevention device of motor, it is characterised in that: described voltage-sag prevention device of motor includes second Input circuit breaker Q F2, commutator U, diode FD, afterflow electric capacity C, inverter UI, transformator T, Second IGCT JZG2, output circuit breaker Q F；

Civil power input L1 phase is connected by the input of described second input circuit breaker Q F2 with described commutator U Connecing, an outfan of described commutator U connects the anode of described diode FD, described diode FD's Negative electrode connects an input of described inverter UI, and another outfan of described commutator U connects described inverse Becoming another input of device UI, two inputs of described afterflow electric capacity C and described inverter UI are connected, The outfan of described inverter UI is connected with described second IGCT JZG2 by described transformator T, institute State the second IGCT JZG2 to be connected with described output circuit breaker Q F；

Described commutator U, will be converted to unidirectional current by the AC energy of the second input circuit breaker Q F2；

Described afterflow electric capacity C, is connected in parallel on the two ends of inverter, plays the effect of filtering, by whole for rectified device U Unidirectional current after stream is filtered；

Described inverter UI, is converted to alternating current by the afterflow filtered unidirectional current of electric capacity C；

Described transformator T, by the alternating current after inverter UI inversion through boosting, reaches to control back In road, contactor coil continues the voltage of adhesive；

Described second IGCT JZG2, plays the effect of electrical switch, controls the output of inverter UI.

A kind of voltage-sag prevention device of motor the most according to claim 1, it is characterised in that: when civil power just Chang Shi, is manually pressed by controlling in loop after start button SA1, and coil KM obtains electric, corresponding catalyst KM Guan Bi, whole circuit is inputted circuit breaker Q F1, catalyst KM through first successively by three-phase mains, to motor M Power supply, makes motor properly functioning, now controls in loop, and civil power input L1 phase one tunnel passes sequentially through conducting The first IGCT JZG1 under state and the catalyst KM under closure state, finally by zero line N with ground even Connecing, another road, after the second input circuit breaker Q F2 under closure state, becomes straight through commutator U1 Stream electricity, this unidirectional current filters through afterflow electric capacity C, and filtered unidirectional current is converted into by inverter UI Alternating current, after boost through transformator T.In this process, inverter UI passes through synchronized sampling circuit Following the tracks of civil power, now, the second IGCT JZG2 turns off, and inverter UI does not exports.

A kind of voltage-sag prevention device of motor the most according to claim 1, it is characterised in that: at civil power just When often powering, whole circuit by

Civil power input L1 phase, civil power input L2 phase, civil power input L3 phase through first input circuit breaker Q F1, Catalyst KM, powers to motor M；In described control loop, after being manually pressed by start button SA1, Coil KM obtains electric adhesive, and catalyst KM closes, described civil power lead up to the first IGCT JZG1, Catalyst KM powers to zero line N to motor M, and another road sequentially passes through the second input circuit breaker Q F2, whole Stream device U1, diode FD, commutator U1, afterflow electric capacity C, transformator T, described during device By synchronized sampling circuit tracing civil power, and now, the second IGCT JZG2 turns off, and inverter UI is not Output.

A kind of voltage-sag prevention device of motor the most according to claim 1, it is characterised in that: when civil power is extensive During complex voltage, the second described IGCT JZG2 continues conducting, and the first IGCT JZG1 is from turning off shape State becomes conducting state, and described inverter UI powers for motor M with civil power simultaneously, then the second brilliant lock Pipe JZG2 turns off, and making whole circuit be restored to civil power is the state that motor M powers.

A kind of voltage-sag prevention device of motor the most according to claim 1, it is characterised in that: described control In loop, if be manually pressed by stop button SA2, catalyst KM power down disconnects, and motor M shuts down.