CN88203069U

CN88203069U - Protector for motor phase breaking

Info

Publication number: CN88203069U
Application number: CN 88203069
Authority: CN
Inventors: 黄志民
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-02-06
Filing date: 1988-02-06
Publication date: 1988-11-23

Abstract

The utility model discloses a protector for motor phase breaking, which is composed of an electric magnet with three winding coils, a copper short circuit ring, a thin spring piece, a tension spring, a movable contact, a fixed contact and a housing. The utility model has the advantages of simple structure, convenient operation, small size, wide purpose, stable action performance, no external power source, and few elements. The protector for motor phase breaking is not limited by the conditions of environmental temperature, motor capacity, connection mode, etc., and can be applicable for three-phase asynchronous motors.

Description

The utility model belongs to the asynchronous motor phase failure protector, belongs to the asynchronous motor phase failure more precisely and detects protector.

At present, the power supply phase failure or the motor windings phase failure of asynchronous motor are recurrent accident in actual motion, cause burning motor; Really belong to the knotty problem in the during-operation service; the seminar that " electronics newspaper " opens up motor open-phase protection since on January 22nd, 8 or four; on March 24th, 8 or six was carried out brief summary by " electronics newspaper " special commentator comrade Cui Shuyan to more than the 30 kind of open-phase protection circuit of having delivered: the protection scheme of several better practicalities at present has bimetal thermal relay; the thermistor protective circuit, protective devices such as temperature relay.But generally all be subjected to condition restriction such as ambient temperature, capacity motor, the mode of connection, volume is bigger, needs external power supply, complex structure, and cost is higher, shortcomings such as action stability difference.

The purpose of this utility model is to design a kind of motor phase failure protector in order to overcome above-mentioned defective.It is without external power supply, element is few, volume is little, simple in structure, easily manufactured, be not subjected to harmonic wave, mains fluctuations interference and motor capacity, condition restriction such as the mode of connection, performance is more stable reliable, easy to use.

The utility model is wound with three coils according to electromagnetic induction principle on same iron core, A, B, C are the coil head end, and X, Y, Z are the coil tail end.This six stature is AX, BY, CZ, in parallel with three-phase fuse respectively; shown in figure one; very little at normal operation fuse resistor; the coil resistance of phase failure protector in parallel is big; coil head and the tail two ends do not have potential difference; most of electric current is by fuse, and electric current is very little in the protector coil, can ignore.Any phase fuse blows in three phase mains; the coil two ends that then are connected in parallel on this phase produce potential difference; just there is a pulse current to pass through; produce enough magnetic force; inhale moving contact (18) normally-closed contact (2) and disconnect cut-out master control power supply; the motor outage shuts down, and has reached the purpose of open phase protection.

Embodiment of the present utility model is provided by figure one, two: figure one is the circuit theory schematic diagram.Among the figure: (1) is phase failure protector; (2) phase failure protector normally closed contact; (3) three-phase fuse, (4) main contactor contact, (5) thermal relay; (6) motor; (7) isolating switch, (8), (9) thermal relay normally closed contact, (10) main contactor pull-in winding; (11) contactor adhesive self-insurance contact, button is started, stopped to connect in (12), (13).

Figure two is (14) fixing fixed screws of fixed contact frame in the structural representation, figure of phase failure protector; (15) insulation cushion; (16) housing; (17) fixed contact framework, (18) moving contact framework, (19) copper short-circuited conducting sleeve; (20) iron core; (21) Insulating frame of coiling, (22) approach spring leaf, (23) rivet; (24) tension spring; (25) fixed screw, (26) insulation cushion, (27) iron core framework; (28) hold-down nut; (29) base insulation board, (30) lead terminal, (31) coil.

Shown in figure two, electromagnet coil (31), iron core (20), iron core framework (27) adopts nut (28) fixing with base insulation board (29).Accompanying insulation cushion (15) between fixed contact framework (17) and the iron core framework (27) adopts screw (14) fixing, accompanying insulation cushion (26) between moving contact frame (18) and iron core framework (27) adopts screw (25) to be connected and fixed, the engage contacts of contact on the moving contact framework (18) and fixed contact framework (17) is normally closed contact (2), and be riveted on moving contact (18) framework as fulcrum with rivet (23) with thin spring leaf (22), moving contact framework (18) is loaded onto tension spring (24) and is made that contact (2) is stable to be contacted.Iron core (20) is wound with three groups of loop A X, BY, CZ.With moving contact adhesive end copper short-circuited conducting sleeve (19) is housed, can prevents beating of adhesive normally closed contact (2), mould firmly or material such as insulation board, bakelite, nylon is made in that this cover of its protector (1) outer mask upper shell (16) is available.Base insulation board (29) is equipped with eight lead terminals, and A, B, C, X, Y, Z, (17), (18) are for using by the dress lead-in wire.With head end, A, B, C are connected between isolating switch (7) load side and the fuse (3) on the power line, X, Y, Z are connected between contactor (4) and the fuse (3) on the circuit, and (17), (18) support lead are that normally closed contact (2) string is in the master control coil circuit.Coil when arbitrary fuse blows (31) produces suction by pulse current electromagnet (20) makes normally closed contact (2) moment disconnection cut off the governor circuit power supply, power supply disconnects motor and shuts down, and it is that fulcrum normally closed contact (2) recovers closure state with thin spring leaf down that electromagnet is released in tension spring (24) effect.

Claims

1, a kind of novel motor phase failure protector; comprise the electromagnet of an iron core around three coils; tension spring; copper short-circuited conducting sleeve, thin spring leaf, moving and fixed contact and housing composition; it is characterized in that iron core is wound with three groups of coils first A, B, C, tail Y, Y, six lead terminals of Z are in parallel with fuse, fuse blows, electromagnet produce normally closed contact (2) the cut-out master control power supply that suction disconnects protector.

2,, it is characterized in that iron core (20) end is equipped with copper becate (19) and prevents that moving contact (18) adhesive from beating as motor phase failure protector as described in the claim 1.

3,, it is characterized in that the thin spring leaf of fulcrum of moving contact framework (18) is connected and fixed as phase failure protector of electric motor as described in the claim 1.

4,, it is characterized in that the normally closed state that closes of moving contact and fixed contact (2) is to be finished by tension spring (24) control as motor phase failure protector as described in the claim 1.

5,, it is characterized in that materials such as the available duroplasts of housing (16), bakelite or nylon make as motor phase failure protector as described in the claim 1.