CN201038084Y

CN201038084Y - Permanent magnetism no-arc AC contactor

Info

Publication number: CN201038084Y
Application number: CNU2006201527959U
Authority: CN
Inventors: 王俭; 蔡志远; 马少华; 厉伟
Original assignee: Shenyang University of Technology
Current assignee: Shenyang University of Technology
Priority date: 2006-11-30
Filing date: 2006-11-30
Publication date: 2008-03-19
Anticipated expiration: 2016-11-30

Abstract

A permanent magnet and no-arc ac contactor belongs to the field of contactor. The utility model comprises a thyristor and a control module, a moving contact, a static contact, a main contact terminal, a movable scaffolding, a keeper, a core, a coil, a neodymium-ferric-boron permanent magnet, a shell and a base. The control module of the thyristor module and the control module comprises a control unit, a switching module, an energy-store module and an IGBT module. The control unit is respectively connected with the thyristor module, the switching module, the energy-store module and the IGBT module. One end of the IGBT module is connected with any phase of a three-phase voltage by the coil, the other end is connected with the other phase of the three-phase voltage. Two ends of the switching module and the energy-store module are all connected with the coil. The thyristor is connected with the three-phase voltage by a three-phase selecting switch. The utility model has the advantages of simple structure, unchanged overall dimension of original contactor, easily realized technique; no-noise operation and no arc switching and so on. The power saving rate is up to over 90 percent, which greatly increases the electrical endurance of the contactor.

Description

A kind of permanent magnetism Arcless AC Contactor

Technical field

The utility model belongs to the A.C. contactor field, particularly a kind of permanent magnetism Arcless AC Contactor.

Background technology

During the work of conventional AC contactor, all to produce electric arc in adhesive and the breaking course, and to lean on coil to switch on after the contactor adhesive always and keep in touch the device attracting state, exist that the coil power consumption is big, on the main contact strong shortcomings such as electric arc arranged when the noise of interchange, on-off circuit being arranged during the energising operation, so both cause a large amount of waste of energy, polluted surrounding environment, greatly reduced the electric life of contactor again.

For many years, the electrical work person has carried out the work of a large amount of various performances of improvement contactor, and such as energy-conservation aspect, the employing that has exchanges adhesive, and direct current keeps; The employing high voltage direct current adhesive that has, low-voltage direct maintenance etc., though have power saving function, coil is still in energising, nothing but the low direct current of voltage, coil still has electric current, so can't reach energy conservation object fully.

In addition, when the contactor on-off circuit produced electric arc, many researchers had adopted the method for multiple extinguish arcs, as increasing the magnetic field arc blow-out, adopting metal grating arc-extinguishing chamber etc.Figure 1 shows that existing A.C. contactor structural profile schematic diagram, it comprises arc-extinguish chamber, arc extinguishing grid pieces, moving contact, fixed contact, main contact terminal, travel(l)ing rest, conducting rod, armature, iron core, coil, shell and base.

Above-mentioned these methods all can not fundamentally be eliminated electric arc, just limit and help extinguish arcs.Visible in the market noncontacting switch though belong to no arc product, costs an arm and a leg, and owing to do not have mechanical contact, the conduction loss height, overload capacity is poor, and is bulky.

The utility model content

At problems of the prior art, the utility model provides a kind of permanent magnetism electricity-saving type Arcless AC Contactor.

This contactor construction as shown in Figure 2, comprise controllable silicon and control module, moving contact, fixed contact, the main contact terminal, travel(l)ing rest, conducting rod, armature, iron core, coil, neodymium-iron-boron permanent magnet, shell and base, shell 10 covers on the base 11, form a cavity, in this cavity, iron core 8 is fixed on base 11 central authorities, 8 one-tenth matrixs of iron core, the iron core bottom has square groove, place permanent magnet 13, all be surrounded with coil 9, two column tops and the closed flux path of armature 7 formation around two columns that protrude, armature 7 is fixedlyed connected with travel(l)ing rest 6, main contact terminal 5 forms mechanical connection by conducting rod 14 and fixed contact 4, moving, two breakpoints are arranged between the fixed contact, and controllable silicon and control module 12 are installed in the arc-extinguish chamber 1 after the repacking, form complete contactor.

The utility model contactor iron core 8 bottom center are placed with neodymium-iron-boron permanent magnet, and its structure as shown in Figure 3.

Controllable silicon and control module have been replaced the arc-control device of existing contactor in the utility model, it comprises silicon controlled module and control module, control module is made up of control unit, handover module, energy-storage module and IGBT module again, and control unit links to each other with silicon controlled module, handover module, energy-storage module and IGBT module respectively; IGBT module one end is connected to any phase in the three-phase voltage by coil, and another links to each other its other end and three-phase voltage; The two ends of handover module and energy-storage module all link to each other with coil; Each two ends, contact of contactor a pair of antiparallel one-way SCR respectively in parallel is connected with load with power supply respectively, as shown in Figure 4 again.

During the utility model contactor operate as normal, at first press starting button SA1, control module is started working, because be 20ms the intrinsic pickup time of contactor, control module makes silicon controlled module prior to the contacts of contactor conducting when 10ms, realizes no arc connection; Turn-off after control module makes the IGBT module conducting 30ms that connects with contactor coil make the contactor adhesive when 10ms simultaneously, no longer including electric current in the coil passes through, this moment, the maintenance of contactor was realized by the magnetic flux that the Nd-Fe-B permanent magnetic that improves in the iron core of design back produces, and had so just realized that no arc is connected and economize on electricity noiselessness operation function; When pressing stop button SA2, during the contactor coil outage, be 15ms the intrinsic release time of contactor, handover module at first switches to the coil of contactor on the energy-storage module, utilize the energy of energy-storage module that the permanent magnetism in the iron core is carried out reverse degaussing, make contactor begin to discharge, for providing trigger voltage, silicon controlled module continues 20ms simultaneously, like this when nearly the 15ms probe of contactor is about to open, because the rapid increase of contact resistance, when the pressure drop of contact two ends is increased to the 8V left and right sides (less than giving birth to arc voltage), because triggering signal exists always, controllable silicon is by being become conducting state by the off position of contact short circuit, and this transfer process is extremely lacked (microsecond level), before contact is not opened as yet, the electric current of contact of flowing through has forwarded on the controllable silicon, contact almost is to open under no-load is cut-off situation like this, and controllable silicon ends owing to triggering signal disappears when 20ms, thereby makes circuit realize that no arc cut-offs.

The utility model utilizes silicon controlled to end the disjunction that realizes circuit, has realized the function of no arc switching thus, and the conducting of circuit is simultaneously carried by mechanical contact, has overcome noncontacting switch conduction loss height, the shortcoming of overload capacity difference.The utility model contactor coil only has big electric current to flow through in contactor adhesive and release moment (all being no more than 30ms) in addition, guarantee the adhesive (excitatory) and release (degaussing) of contactor, after the contactor adhesive before discharging, no current in the coil, therefore, all great changes will take place to improve coil after the design and no matter be the number of turn or line footpath, saves a large amount of copper materials.That the utility model also has is simple in structure, do not change original contactor overall dimension, advantages such as technology realizes easily, noiselessness operation, and power saving rate reaches more than 90%, improved the electric life of contactor greatly.

Description of drawings

Fig. 1 is existing A.C. contactor structural profile schematic diagram;

Fig. 2 is the utility model contactor construction generalized section;

Fig. 3 is equipped with the magnetic system structural representation of neodymium-iron-boron permanent magnet for the utility model contactor;

Fig. 4 is the utility model schematic block circuit diagram;

Fig. 5 is the circuit theory diagrams of the utility model embodiment,

(a) be control module circuit theory diagrams in the embodiment,

(b) be ghyristor circuit schematic diagram in the embodiment.

1---arc-extinguish chamber, 2---arc extinguishing grid pieces, 3---moving contact, 4---fixed contact, 5---main contact terminal, 6---travel(l)ing rest, 7---armature, 8---iron core, 9---coil, 10---shell, 11---base, 12---controllable silicon and control module, 13---neodymium-iron-boron permanent magnet, 14---conducting rod, 15---control module among the figure.

Embodiment

Below in conjunction with accompanying drawing the utility model is described further.

Figure 2 shows that present embodiment structural profile schematic diagram, it comprises controllable silicon and control module, moving contact, fixed contact, main contact terminal, travel(l)ing rest, conducting rod, armature, iron core, coil, neodymium-iron-boron permanent magnet, shell and base, wherein controllable silicon and control module have been replaced the arc extinguishing part of existing contactor, and have increased neodymium-iron-boron permanent magnet in the iron core bottom.Shell 10 covers on the base 11, form a cavity, in this cavity, iron core 8 is fixed on base 11 central authorities, 8 one-tenth matrixs of iron core, the iron core bottom has square groove, place permanent magnet 13, all be surrounded with coil 9, two column tops and the closed flux path of armature 7 formation around two columns that protrude, armature 7 is fixedlyed connected with travel(l)ing rest 6, main contact terminal 5 forms mechanical connection by conducting rod 14 and fixed contact 4, two breakpoints are arranged between the dynamic and static contact, and controllable silicon and control module 12 are installed in the arc-extinguish chamber 1 after the repacking, form complete contactor.

Fig. 3 is a magnetic system structural representation in the present embodiment.

Fig. 5 (a) is depicted as present embodiment control module circuit theory diagrams, two relay K A1, KA2 realize the handover module function among the figure, capacitor C3, D6 realize the energy-storage module function, IGBT, YMDZ realize the IGBT functions of modules, U1A, U1B and peripheral circuit thereof are realized the control module function, wherein the coil of relay K A1 directly links to each other with the 12V power supply, its a pair of normally opened contact links to each other with the collector electrode of 380V Voltage pulsating direct-current supply and IGBT respectively, and a pair of normally-closed contact then links to each other with contactor coil; Coil one end of relay K A2 links to each other with the 12V power supply, and the other end links to each other with the collector electrode of triode Q1, two normally opened contact respectively with exchange the 380V power supply with the string have the capacitor C 3 of diode D6 to link to each other; The output of voltage comparator UIA links to each other with the base stage of IGBT by resistance R 8, and two inputs are broken and linked to each other with D6, C2 with R5, R6, R7 respectively; The output of voltage comparator UIB links to each other with the base stage of triode Q1 by resistance R 4, and the output of UIB also links to each other with capacitor C 2 by diode D3 simultaneously, and two inputs are broken and linked to each other with C1, D1 with R1, R2, R3 respectively; The base stage of IGBT is linked the output of voltage comparator UIA by resistance R 8, and collector electrode links to each other with the 380V Voltage pulsating direct-current supply by diode D6, and emitter links to each other with ground, a piezo-resistance YMDZ in parallel between emitter and the collector electrode; Be connected to diode D1 between 12V power supply and the ground, a, b the end respectively with Fig. 5 (b) in a ', b ' end link to each other.

Fig. 5 (b) is depicted as ghyristor circuit schematic diagram in the present embodiment, adopted conventional SCR control circuit, among the figure every phase contact KM two ends all in parallel a pair of antiparallel controllable silicon SCR, when contactor coil is switched on, be about 20ms the intrinsic pickup time of contactor, circuits for triggering among the figure make three pairs of antiparallel controllable silicon conductings when 10ms, controllable silicon is connected circuit prior to the contact of contactor like this, during to the 20ms contact closure, contact is just with the controllable silicon short circuit, because the silicon controlled tube voltage drop is not enough to produce electric arc, historical facts or anecdotes has showed no arc turn-on power loss.When coil blackout, be about 15ms the intrinsic release time of this contactor, and thyristor gating circuit is because the electric current that has storage capacitor C1 to discharge makes circuits for triggering keep the triggering state before 20ms always, like this when nearly 1 5ms probe of contactor is about to open, because the rapid increase of contact resistance, when the pressure drop of contact two ends is increased to the 8V left and right sides (less than giving birth to arc voltage), because triggering signal exists always, controllable silicon is by being become conducting state by the off position of contact short circuit, this transfer process is extremely lacked (microsecond level), before contact is not opened as yet, the electric current of contact of flowing through has forwarded on the controllable silicon, contact almost is to open under no-load is cut-off situation like this, and controllable silicon ends owing to triggering signal disappears when 20ms, thereby makes circuit realize that no arc cut-offs.

Claims

1. permanent magnetism Arcless AC Contactor, comprise upper end cover, moving contact, fixed contact, main contact terminal, travel(l)ing rest, conducting rod, armature, iron core, coil, shell and base, it is characterized in that also comprising controllable silicon and control section, permanent magnet, iron core becomes matrix, the iron core bottom has square groove, place permanent magnet, controllable silicon and control section are installed in the upper end cover; Control section is made up of control unit, switching device, energy-storage travelling wave tube and IGBT element in controllable silicon and the control section, and control unit links to each other with controllable silicon part, switching device, energy-storage travelling wave tube and IGBT element respectively; IGBT element one end is connected to any phase in the three-phase voltage by coil, and another links to each other its other end and three-phase voltage; The two ends of switching device and energy-storage travelling wave tube all link to each other with coil; Each two ends, contact of contactor a pair of antiparallel one-way SCR respectively in parallel is connected with load with power supply respectively again.

2. a kind of permanent magnetism Arcless AC Contactor as claimed in claim 1, the coil that it is characterized in that a relay in the described control section circuit directly links to each other with DC power supply, its a pair of normally opened contact links to each other with the collector electrode of Voltage pulsating direct-current supply and IGBT respectively, and a pair of normally-closed contact then links to each other with contactor coil; Coil one end of another relay links to each other with DC power supply, and the other end links to each other with the collector electrode of triode, and two normally opened contact has the electric capacity of diode to link to each other with AC power with string respectively; The output of a voltage comparator links to each other with the base stage of IGBT by resistance, and two inputs link to each other with diode with resistance, electric capacity respectively; The output of another voltage comparator links to each other with the base stage of triode by resistance, and its output also links to each other with electric capacity by diode simultaneously, and two inputs link to each other with diode with resistance, electric capacity respectively; The base stage of IGBT is linked the output of first voltage comparator by resistance, and collector electrode links to each other with Voltage pulsating direct-current supply by diode, and emitter links to each other with ground, a piezo-resistance in parallel between emitter and the collector electrode; Be connected to diode between DC power supply and the ground, a, b end links to each other with a ', the b ' end of controllable silicon partial circuit respectively in the control section circuit.