CN2273915Y

CN2273915Y - Phase interruption protective and safety control device for three phase ac electris motor

Info

Publication number: CN2273915Y
Application number: CN 96220463
Authority: CN
Inventors: 王玉平; 沈喜伟
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-09-23
Filing date: 1996-09-23
Publication date: 1998-02-04
Anticipated expiration: 2006-09-23

Abstract

The utility model relates to a phase interruption running safety controller for a three-phase AC motor, which is composed of an AC contactor, a transformer, an operating switch which is connected with the input end of the transformer, a rectifier which is connected with the output end of the transformer and a DC relay which is connected with the output end of the rectifier. When any phase of a three-phase AC power supply generates suddenly open-phase failure, the utility model can cut off instantly the power supply to make the motor stop runnin, and thus the motor is effectively protected from being burnt. The utility model has the advantages of simple structure, low cost, favorable performance, high reliability and strong adaptability.

Description

Three phase alternating current motor phase-deficient operation security controller

The utility model relates to a kind of three-phase alternating current machine controller, thus particularly a kind of three-phase alternating-current supply any once mutually suddenly after the phase shortage, can both cut off the electricity supply and protect the unlikely three phase alternating current motor phase-deficient operation security controller that burns of three phase alternating current motor effectively.

The modal fault of three phase alternating current motor is many to be caused by the phase-deficient operation face, i.e. two-phase alternating current electricity power supply, and the original load of three phase alternating current motor is at this moment only born by two phase windings of three phase alternating current motor, the long slightly motor that just burns of time.In present prior art; for protecting motor, preventing that the three phase alternating current motor phase-deficient operation from being burnt; mostly the measure of taking is to settle thermal relay in the control loop of three phase alternating current motor; but such system; power supply lack any one mutually after; all can not make control relay discharge, separate electrical network rapidly and thereby motor is protected motor effectively, also should particularly point out the thermal relay that is to use and only be suitable in the small-capacity motor dragging system, using.

The purpose of this utility model is to provide a kind of three phase alternating current motor phase-deficient operation security controller; this three phase alternating current motor phase-deficient operation security controller, thus three-phase alternating-current supply any once mutually suddenly after the phase shortage, can both cut off the electricity supply and protect effectively that three phase alternating current motor is unlikely to be burnt.

The purpose of this utility model can realize by such technical scheme: this three phase alternating current motor phase-deficient operation security controller, it comprises A.C. contactor KZ, transformer B, be connected on the console switch K of transformer B input, be connected on the rectifier of transformer B output and be connected on the direct current relay J of rectifier output end, the normally opened contact J of serial connection direct current relay J in the A.C. contactor KZ branch road ₁Use this three-phase alternating current machine controller, make motor D pass through three normal opened contact (KZ of the A.C. contactor KZ of three-phase alternating current machine controller ₁, KZ ₂, KZ ₃) connect three-phase alternating-current supply, make the transformer B input that is connected to console switch K of three-phase alternating current machine controller be connected on two alternate, the serial connection direct current relay J normally opened contact J that makes the three-phase alternating current machine controller of three-phase alternating-current supply ₁A.C. contactor KZ branch road be connected across the other two alternate of three-phase alternating-current supply, the closed procedure K switch, can make direct current relay J get electric adhesive by transformer B and the rectifier that is connected on transformer B output, direct current relay J gets electric adhesive promptly makes the other two alternate A.C. contactor KZ branch roads that are connected across three-phase alternating-current supply connect, A.C. contactor KZ gets electric adhesive, thereby connect electrical network and motor D, motor D work; When motor D is worked, the opening operation K switch, direct current relay J is that the dead electricity action makes serial connection direct current relay J normally opened contact J ₁A.C. contactor KZ branch road open circuit, the action of A.C. contactor KZ dead electricity, separate electrical network and motor D, motor D quits work; And in service in motor D, during any phase phase shortage of three-phase alternating-current supply, all will make serial connection direct current relay J normally opened contact J ₁A.C. contactor KZ branch road dead electricity, A.C. contactor KZ dead electricity action, separate electrical network and motor D, motor D quits work, and prevents the motor D phase-deficient operation and is burnt.

This three phase alternating current motor phase-deficient operation security controller provided by the utility model; three-phase alternating-current supply any once mutually suddenly after the phase shortage, can both cut off the electricity supply makes that thereby motor is out of service protects effectively that motor is unlikely to be burnt; simple in structure, cost is low, compared with prior art: have the advantage that performance is good, reliability is high, adaptability is strong.

Below in conjunction with embodiment and accompanying drawing thereof the utility model is described in further detail:

Electrical schematic diagram when the three phase alternating current motor phase-deficient operation security controller that Fig. 1 is provided for the utility model embodiment is used.

With reference to accompanying drawing 1, this three phase alternating current motor phase-deficient operation security controller that the utility model embodiment is provided, it comprises A.C. contactor KZ, transformer B, be connected on the console switch K of transformer B input, be connected on the half-wave rectifier that is made of rectifier diode GB and filter capacitor C of transformer B output, the direct current relay J that is connected on the half-wave rectifier output, the normally opened contact J of serial connection direct current relay J in the A.C. contactor KZ branch road ₁Among the figure, RD---fuse.

Claims

1, a kind of three phase alternating current motor phase-deficient operation security controller, it is characterized in that: it is to be made of A.C. contactor KZ, transformer B, the console switch K that is connected on transformer B input, the rectifier that is connected on transformer B output, the direct current relay J that is connected on rectifier output end, the normally opened contact J of serial connection direct current relay J in the A.C. contactor KZ branch road ₁

2, three phase alternating current motor phase-deficient operation security controller according to claim 1, it is characterized in that: its rectifier is made of rectifier diode GB and filter capacitor C.