CN2148393Y

CN2148393Y - Permanent-magnet loss-of-phase protecting energy-saving contactor

Info

Publication number: CN2148393Y
Application number: CN 93203228
Authority: CN
Inventors: 王启玉; 刘志新
Original assignee: No4 Diversified Economy Factory Langxiang Forestry United Enterprise Co Tiel
Current assignee: No4 Diversified Economy Factory Langxiang Forestry United Enterprise Co Tiel
Priority date: 1993-02-18
Filing date: 1993-02-18
Publication date: 1993-12-01
Anticipated expiration: 2003-02-18

Abstract

The utility model relates to a permanent-magnet loss-of-phase protecting energy-saving contactor which solves the problem which is brought because a magnetic coil is connected with electricity when a contactor works. Simultaneously the utility model can provide protection for the loss-of-phase of load. A permanent magnet is arranged at the lower part of the iron plate and the upper part of an electrical magnet of an existing contactor. The permanent magnet is connected with the iron plate. The tail circuits of a moving contact group are respectively connected with a loss-of-phase sensor. Simultaneously the exciting coil of the electrical magnet is connected with a voltage transformation control circuit. The contactor of the utility model can be widely used for the three-phase electric drive, the dc electric drive and the distribution circuits of other load circuits.

Description

Permanent-magnet loss-of-phase protecting energy-saving contactor

The utility model relates to electromagnetic component, is a kind of magneto open-phase protection energy-saving contactor.

At present, existing contactor all is at electromagnet coil power, makes it produce attraction, thereby the adhesive of maintenance main contact reaches operating state.Because long-term energising, consumed power not only, and very easily burn coil.When supply voltage is crossed when low, electromagnetic force can reduce, when the alternating current zero passage, under action of reset spring, judder can take place together with main contact in contactor armature, produces noise on the one hand, can produce stronger high-temperature electric arc on the one hand between load-carrying contact, gently then burn out main contact and heavily then cause contact melting welding, can not cut off load power source and cause the accident.Simultaneously, usually be in operation also since separate the tentaculum main contact burn and other fault causes the phase-deficient operation of load, he can causes great harm for the threephase asynchronous even load.

The purpose of this utility model: by the part of contactor construction is improved, thereby the coil no power is avoided the problem brought because of coil when making it in working order, quits work automatically during the contactor phase-deficient operation simultaneously, to realize open-phase protection.

Technical solution of the present utility model: form by the elements such as the door frame spring that resets of deciding sets of contacts, moving contact group, electromagnet, connect together with the moving contact group, decide sets of contacts, the moving contact group is three groups, below iron plate, the top of electromagnet, permanent magnet is set, it is linked to each other with iron plate.On moving contact group buttock line, respectively connect a phase shortage transducer, two termination voltage transformation control loops of magnet exciting coil.By changing the voltage direction of magnet exciting coil, magnetic field that makes its generation and the magnetic field paramagnetic of permanent magnet or diamagnetic, thereby the cut-offfing of control contactor again because the setting of permanent magnet, do not reset the magnet exciting coil back contact that cuts off the power supply.Logical circuit in the phase shortage transducer control voltage transformation control loop makes it when phase-deficient operation, and magnetic field and magnetic field of permanent magnet that magnet exciting coil produces are diamagnetic, thereby line disconnection realizes open-phase protection.

Advantage of the present utility model: coil needn't be switched on during owing to the contactor operating state, thereby has saved electric energy, the charged variety of issue that brings of coil when having reduced originally because of operating state.Decide contact because the structure that adopts is only moved with six, decide moving contact than original 12 and lack half, from and saved the making raw material.Simultaneously, realized the open-phase protection of load again, the harm of having avoided phase-deficient operation that load is caused.

Following accompanying drawing 3 embodiment of the present utility model.

Fig. 1 is a surface structure schematic diagram of the present utility model.

Fig. 2 is along the cutaway view of A-A line among Fig. 1.

Fig. 3 is a voltage transformation control loop work schematic diagram of the present utility model.

In Fig. 1-3,1 voltage transformation control circuit box, 2 total cartridge chassis, 3 electromagnetism are the iron stamen definitely, 4 small rods, 5 main circuit insulation boards, 6 decide sets of contacts, 7 moving contact groups, 8 bearing pins, 9 permanent magnets, 10 iron plates, 11 armature transmission arms, 12 limiting position of armature devices, 13 moving contact group bearing pins, 14 transmission arms, 15 board-like bearings, 16 insulation supplementary bearings, 17 steel axles, 18 main transmission arms, 19 main shaft bearings, 20 final drive shafts, 21 phase shortage transducers, 22 contactor auxiliary contact, 23 contactor magnetic coils, 24 back-moving springs, 25 transmission arms that reset, 26 main shaft bearings, 27 auxiliary contact transmission arms, 28 auxiliary contact Transmission Bridge, 29 voltage transformation control loops, R ₁, R ₂Resistance, C electric capacity, D ₁-D ₂Rectifier bridge, QA start button, Q-1, Q-3 start button are often made war, the normally closed point of Q-2, Q-4, stop button TA, stop button often make war T-1, T-3, normally closed some T-2, T-4, magnet exciting coil KMJ, sustained diode ₅, AND circuit KA-2, OR circuit KA-1, circuit breaker HK, threephase asynchronous M3.

Wherein permanent magnet 9 is provided with three, and corresponding with iron stamen, the upper surface of electromagnet 3.The electronic component of voltage transformation control loop 29, plug connector elements are potted in the voltage transformation control circuit box 1 and are placed on total cartridge chassis 2.In voltage transformation controller loop 29, the end of magnet exciting coil KMJ links to each other with normal battle of the T-1 of stop button TA, the normally closed some Q-2 of start button QA, an end of capacitor C successively, and the other end of capacitor C links to each other with the normally closed some Q-4 of start button QA, the other end of magnet exciting coil KMJ successively.DC power supply and resistance R ₁, moving contact KM-2, capacitor C, moving contact KM-1, resistance R ₂Be serially connected successively.DC power supply is serially connected with normal battle of the Q-3 of normally closed some T-2, the magnet exciting coil KMJ of normal battle of Q-1, the stop button TA of start button QA, start button QA again.AND circuit KA-2 goes here and there normally closed some T-4, the sustained diode of stop button TA successively ₅Back and magnet exciting coil KMJ also connect.OR circuit KA-1 one termination magnet exciting coil KMJ, a termination capacitor C.OR circuit KA-1, AND circuit KA-2 are controlled by the phase shortage transducer directly.

Below in conjunction with accompanying drawing in detail its course of work is described in detail: when work, press start button QA, then DC power supply through start button QA two normal battle Q-1 and the normally closed some T-3 of Q-3, stop button TA magnet exciting coil KMJ forward is magnetized, make that the polarity of electromagnet 3 is opposite with the polarity of permanent magnet 9, make permanent magnet 9 drive 7 motions of moving contact group, and make moving contact group 7 and decide sets of contacts 6 adhesives, two of moving contact group 7 assist normal battle of KM-1, KM-2 closure during adhesive.Unclamp start button QA, magnet exciting coil KMJ breaks away from power supply, and permanent magnet 9 keeps adhesive by permanent remanent magnetism power and the electromagnet 3 much larger than back-moving spring 24 reaction forces such as grade, thereby makes moving contact group 7 and decide sets of contacts 6 maintenance adhesives, the contactor operate as normal, DC power supply is charged to capacitor C simultaneously.When the line disconnection of needs contactor, press stop button T _AMake Q-2, the Q-3 of normal battle T-1, the start button QA of capacitor C through stopping button TA to magnet exciting coil KMJ back discharge at normally closed, the both end voltage of capacitor C is near the peak value of DC power supply voltage, because the storage electric charge of capacitor C is limited during beginning, coil resistance is very little, velocity of discharge piece, permanent magnet 9 demagnetizations, thereby the reaction force that permanent domestic animal remanent magnetism power provides less than back-moving spring 24 grades, permanent magnet 9 begins to discharge, produce the gap, in the gap, demagnetizing effect stops.At this moment, the two ends of capacitor C also have certain terminal voltage, make permanent magnetic field and electromagnetic field under identical polar, produce repulsive force, with the acting in conjunction of the reaction force of displacement spring 24 under, permanent magnet 9 returns to the off-position with very fast speed, drive moving contact 7 work thus, cut off supply line.When in service certain when cutting off the power supply mutually; then the current coil electric current of the phase shortage transducer 21 of this phase is zero; make AND circuit KA-2 cut off; OR circuit KA-1 connects; make capacitor C to magnet exciting coil KMJ back discharge; state is the same when pressing stop button TA with contactor, thereby line disconnection has realized open-phase protection.

Claims

1, a kind of magneto open-phase protection energy-saving contactor is formed with the back-moving spring elements such as (24) that the moving contact group links together by deciding sets of contacts (6), moving contact group (7), electromagnet (3), it is characterized in that:

A, decide sets of contacts, the moving contact group is three groups, the below in iron plate (10), the top of electromagnet (3) is provided with permanent magnet (9), and it is linked to each other with iron plate (10);

B, magnet exciting coil KMJ are connected in the voltage transformation control loop (29);

C, on the buttock line of moving contact group (7), respectively connect a phase shortage transducer (21).

2, magneto open-phase protection energy-saving contactor according to claim 1, it is characterized in that: permanent magnet (9) is provided with three, and corresponding with the iron stamen upper surface of electromagnet (3).

3, magneto open-phase protection energy-saving contactor according to claim 1 is characterized in that: in the described voltage transformation control loop:

The end of a, magnet exciting coil KMJ links to each other with the normally closed some Q-2 of normal battle of T-1, the start button QA of stop button TA and an end of capacitor C successively, the other end of capacitor C successively with the normally closed some Q-4 of start button QA, the other end of magnet exciting coil KMJ links to each other;

The two ends of b, capacitor C link to each other with DC power supply through moving contact KM-1, KM-2 respectively;

C, AND circuit KA-2 go here and there normally closed some T-4, the sustained diode of stop button TA successively ₅Back and magnet exciting coil KMJ also connect;

D, OR circuit KA-1, a termination magnet exciting coil KMJ, a termination capacitor C.