CN2142226Y

CN2142226Y - Protector for electric motor

Info

Publication number: CN2142226Y
Application number: CN 92237062
Authority: CN
Inventors: 田景喜; 李江
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-11-17
Filing date: 1992-11-17
Publication date: 1993-09-15
Anticipated expiration: 2002-11-17

Abstract

The utility model belongs to a protector for power electric appliances. The bottom of the structure is a base. One side of the base is provided with three input circuit wiring terminals; the other side is a three-phase electric output terminal. The base is provided with three n-shaped iron cores. Bar-shaped iron cores are arranged above openings. Insulating rods are transversely arranged below the iron cores, and are connected with micro-switch touch keys. The three iron cores are respectively wound with three-phase electric windings. A micro-switch normal-closed contact point is connected in a control circuit in series. When one phase of a three-phase circuit is electrically cut off, electric magnets are attracted together, and the normal-closed contact point is switched off for the goal of protecting a motor. The utility model has the advantages of simple structure, convenient installation and operation and high reliability, and is suitable for protecting various motor.

Description

Protector for electric motor

The utility model belongs to the power Protector for electric appliances.Be applicable to that industrial operation electric motor protecting uses.

At present in the various electrical equipment of industrial application; motor is maximum most important electric equipments; the safety of operation motor; so that be not damaged is current insoluble problem; current automatic air-break switch and the overload relay of mostly adopting in the motor common-battery system protected the damage of motor self; overload relay is made up of several groups of sheet metals; the current overload contact just leaves; in case motor breaks down suddenly, electric current is very big, and the relay reaction is not come; can not draw away contact; motor damages equally, and the shortcoming of air switch is drop-away current just is transferred to equipment before dispatching from the factory several times, does not have the protective effect of motor at all.

For solving the safety of above motor operation; the purpose of this utility model provides a kind of motor protecter; utilization is three windings of coiling on three iron cores; utilize the magnetic field principle for balance; one phase power cut-off is wherein arranged; relay work disconnects the three-phase electricity power supply immediately, has effectively protected the safety of motor operation.

It is a bakelite base that structural design of the present utility model is achieved in that below its structure of protector; a side has three input circuit terminals on base; opposite side is the three-phase electricity outlet terminal; three " ㄈ " sections cores forward are housed on base; each iron core is placed in the groove; opening upwards; opening part at each iron core is fixed with a strip iron core; with an end is axle; the other end is lifted by spring leaf; with iron core one end one little space (as shown in Figure 3) is arranged; below three parallel striped iron cores, an insulating bar is housed laterally; in the middle of recommending, insulation joins with the sensitive switch touching; the output of sensitive switch; the normally-open normally-close contact is concatenated in the control circuit of air switch; three windings that three-phase electricity is all arranged on three straightways of three " ㄈ " sections cores; it is around to method being each phase winding end on the straightway of one of them " ㄈ " sections core earlier; then around the intermediate ends of an other iron core; straightway one end in addition of iron core is left in coiling again; the direction of coiling winding is identical on three iron cores; three-phase electricity winding A; B; the C phase three-phase number of turn is identical; then with the corresponding input of three phase winding first and last ends with protector; output joins, and protector is contained between air switch and the electricity consumption motor.

Its operation principle: use electromagnetic theory, three-phase electricity A, B, the C phase, in the same way with circle on same rectilinear iron core, because three-phase balance, the iron core two ends do not produce magnetic force, when three phase windings are respectively on three iron cores, as mentioned above, as long as have a winding phase failure this moment, the magnetic field imbalance produces very big magnetic force on the iron core of phase failure winding, because of the electric current disequilibrium, produce the moving iron core of suction adhesive bar shaped, the suction of strip iron core contains by the lateral isolation bar presses sensitive switch touching, sensitive switch work, normally closed contact disconnects, because this contact is serially connected in the starter control circuit, so starter disconnects the power supply of motor moment stop, guaranteed the safety of motor, moving iron core gets ready for the electric current phase failure because the elastic force of following spring leaf is upspring again automatically, and moment is burnt the fault generation of winding when so just having avoided the motor phase failure.

The advantage of the utility model: simple in structure, easy to install, be active in one's movements, working stability is reliable, is adapted at using in the various power consumption equipments.

Detailed structure of the present utility model is provided by following examples and accompanying drawing.

Fig. 1 is the motor protecter shape assumption diagram;

Fig. 2 is the motor protecter structure principle chart;

Fig. 3 is a motor protecter structure A-A profile;

Fig. 4 is motor protecter winding connection figure;

Fig. 5 is motor protecter connection layout in circuit.

Its structure is known by Fig. 1～5; (1) is the protector unsplit bedplate; (2) be the three-phase electricity input and output contact; (3) be sensitive switch, (4) lateral isolation bar, (5) are the insulating bar fulcrum; (6) be the solder joint of input, output; be connected in the power supply circuits, (7) (8) (9) are three windings of three-phase electricity, and the input and output contact on its first and last end and the base joins.(10) be the folding of moving iron core, (11) join for insulating bar and sensitive switch, and (12) are " ㄈ " sections core, secured core, (13) are strip iron core, moving iron core, its three-phase winding method as shown in Figure 4, the number of turn of winding and line footpath size is decided by power of electric motor on the iron core.

Claims

1; a kind of motor protecter; it is characterized in that its structure is a bakelite base below being; a side has three input circuit terminals on base; opposite side is the three-phase electricity output; three " Contraband " sections cores forward are housed on base; each iron core is placed in the groove; opening upwards; opening part at each iron core is placed with a strip iron core; with an end is axle, and the other end is lifted by spring leaf, below three parallel striped iron cores an insulating bar is housed laterally; join with the sensitive switch touching in the middle of the insulating bar, sensitive switch output normally closed contact is concatenated in the air switch control circuit.

2, by the described protector of claim 1; it is characterized in that on three straightways of three " ㄈ " sections cores, all having three windings of three-phase electricity; its coiling is each winding end on the straightway of one of them " ㄈ " sections core earlier; again around the interlude of an other iron core; straightway one end in addition of iron core is left in coiling again; three-phase electricity winding technique direction is identical, and the number of turn is identical, and the first and last end of three phase windings is joined with corresponding input, the output of protector.