CN2220698Y

CN2220698Y - Protector for motor a.c. contactor adhesion

Info

Publication number: CN2220698Y
Application number: CN 94230353
Authority: CN
Inventors: 连正美
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-09-29
Filing date: 1994-09-29
Publication date: 1996-02-21
Anticipated expiration: 2004-09-29

Abstract

The utility model relates to a protector for motor ac contactor adhesion, comprising the main return circuit and the controlling return circuit of a motor. The utility model is characterized in that the coils of relays ZJ1 and ZJ2 are respectively parallelly connected with the coils of the ac contactors QC and TC of the controlling return circuit; the three normally closed contacts of the relays ZJ1 and ZJ2 are serially connected; the three normally closed contacts form star-shaped connection with the coils of relays ZJ3, ZJ4 and ZJ5. The utility model is parallelly connected with control relays ZJ6 and ZJ7 through the relays ZJ3, ZJ4 and ZJ5; therefore, the protector for motor ac contactor adhesion controls an ac contactor HC. When the problem of the adhesion of the contacts of the ac contactor QC or the ac contactor TC is met, the utility model cuts off a three phase power supply to protect devices and motors.

Description

Motor A.C. contactor adhesion protector

The utility model relates to a kind of motor, particularly high power motor A.C. contactor adhesion protector.

The normal operation of the used crane motor of factory, harbour, goods station at present can make crane move forward and backward, and can make the weight rise and fall again simultaneously, finishes the handling and loading task to weight.The contact adhesion takes place but the A.C. contactor of control crane motor running is big because of starting current sometimes, electric component is of poor quality, as the three-phase adhesion, motor should stall and fail stall, causes equipment to damage, as two-phase or a phase adhesion, then motor scaling loss.

The purpose of this utility model is to overcome weak point of the prior art, and a kind of motor A.C. contactor adhesion protector is provided.

The purpose of this utility model can realize by following technical proposals:

This motor A.C. contactor adhesion protector, it comprises motor major loop, control loop, it is characterized in that:

The coil of relay ZJ1, ZJ2 respectively with control electronic rotating A.C. contactor QC, TC coils from parallel connection of coils;

3 normally-closed contacts of relay ZJ1 are connected with the coil of 3 normally-closed contacts of relay ZJ2 and relay ZJ3, ZJ4, ZJ5 respectively, and are mid point with the other end of relay ZJ3, ZJ4, ZJ5 coil, constitute with star that three phase lines link to connect;

The normally opened contact parallel connection of relay ZJ3, ZJ4, ZJ5, an one end and a phase line link, and other end series relay ZJ6 coil and mid point link;

The normally opened contact parallel connection of relay ZJ6, ZJ7, the branch road that the coil of an end series relay ZJ7 constitutes are connected across on the relay ZJ7 normally-closed contact and A.C. contactor HC coil series arm between two phase lines;

3 normally opened contacts of A.C. contactor HC are connected in respectively in 3 phase lines.

This motor A.C. contactor adhesion protector circuit design is reasonable; as the ac contactor contact adhesion of Motor Control loop; this protector can be cut off the electricity supply automatically; avoid equipment breakdown; the protection motor; prolong the electric component life-span, before the contact adhesion phenomenon was not got rid of, general supply was not sent.If time-delay phenomenon (it is little that magnet has oil or voltage to hang down active force) takes place A.C. contactor, also can cut off general supply.Three phase mains such as phase shortage, A.C. contactor is failure to actuate, thus the protection motor.

Fig. 1 is this motor A.C. contactor adhesion protector circuit diagram.

Now 1 pair of the utility model is further described in conjunction with the accompanying drawings.

With reference to Fig. 1, the master on off K that at first closes presses master switch T, and A.C. contactor HC coil gets electric, the closing of contact.When pressing the button QA, A.C. contactor QC coil gets electric, the closing of contact, and this moment, relay ZJ1 coil got electricly, and normally-closed contact disconnects, and motor D is just transporting row.When pressing the button TA, A.C. contactor TC coil gets electric, the closing of contact, and this moment, relay ZJ2 coil got electricly, and normally-closed contact disconnects, the motor D operation of reversing.

Cut-off push button QA, TA, if A.C. contactor QC or the adhesion of TC contact, relay ZJ3 ZJ4 or ZJ5 coil get, the normally opened contact closure, relay ZJ6 coil gets electric, the closing of contact, relay ZJ7 coil gets electric and self-insurance, normally-closed contact disconnects, and A.C. contactor HC coil losing electricity, contact disconnect, and cut off three phase mains.Have only after A.C. contactor QC or the adhesion of TC contact are excluded, motor could run well.

Claims

1, a kind of motor A.C. contactor adhesion protector, it comprises motor major loop and control loop, it is characterized in that:

The coil of relay (ZJ1), (ZJ2) respectively with A.C. contactor (QC), (TC) coils from parallel connection of coils of control motor rotating;

3 normally-closed contacts of relay (ZJ1) are connected with the coil of 3 normally-closed contacts of relay (ZJ2) and relay (ZJ3), (ZJ4), (ZJ5) respectively, and be mid point with the other end of relay (ZJ3), (ZJ4), (ZJ5) coil, constitute with star that three phase lines link and connect;

The normally opened contact parallel connection of relay (ZJ3), (ZJ4), (ZJ5), an one end and a phase line link, and other end series relay (ZJ6) coil and mid point link;

Relay (ZJ6) normally opened contact parallel connection (ZJ7), the branch road that the coil of an end series relay (ZJ7) constitutes are connected across on relay (ZJ7) normally-closed contact and A.C. contactor HC coil series arm between two phase lines;

3 normally opened contacts of A.C. contactor (HC) are connected in respectively in 3 phase lines.