CN2231830Y

CN2231830Y - Double-magnetic starter

Info

Publication number: CN2231830Y
Application number: CN 95200180
Authority: CN
Inventors: 张平
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-01-06
Filing date: 1995-01-06
Publication date: 1996-07-24
Anticipated expiration: 2005-01-06

Abstract

The utility model relates to a phase interruption protector for motors, particularly a protector for small-sized motors. The utility model provides a simple double-magnetic starter, which is composed of two contactors, the coil of a main contactor is connected between a phase A and a phase B by the contact points of an auxiliary contactor, the three main contact points of the main contactor are connected with the main circuit of a motor, the coil of the auxiliary contactor is connected between the normally opened press-button and the normally closed press-button of the start switch of an external circuit in series, the fuse is connected between a phase C and a midline, the auxiliary contact point of the main contactor is connected with the normally opened press-button of the start switch in parallel, the lack phase protection and the phase interruption protection for the motor are realized, and the motor can not be burned out.

Description

Two magnetic actuators

The utility model relates to a kind of open-phase protection device for electromotor, particularly relates to the protective device of miniature motor.

Existing electic protection has short circuit, overcurrent, decompression and kind such as under-voltage.

Motor is protected scarce in addition, open phase protection.Overload is mainly made in scarce, the phase failure of large and medium-sized motor to be handled, so use the overtemperature relay protection to get final product, but thermal relay have specific overload inert and operate time constant, the capacity of this two tops parameter and motor is inversely proportional to, be that capacity is more little, its overload time constant is big more, and inert is big more, and the overload capacity of miniature motor is very little; And people relatively pay attention to the distribution of large and medium-sized motor, and adopt single main line or branch line, single control cubicle, and safeguard measure is more perfect.And miniature motor is generally not too paid attention to, it is mixed distribution often, normal and illumination, single-phase welding machine mix in one network, use a public distribution board.This distribution board is made house lead in the disconnecting link of fusible link often, and it is the isolation disconnect, is again short circuit, the overload protection of circuit.In case certain relative ground circuit, fusible link promptly fuses, and therefore, miniature motor is that Lou sees not bright because of phase-deficient operation burns.

The purpose of this utility model be to provide a kind of at the motor network in case lack, promptly outage is anxious automatically stops or be not activated in the phase failure, the starter that is not burnt with timely protection motor.

The utility model is to be combined by two A.C. contactors, and the pull-in winding voltage of main contactor K is 380V, has three main contacts (often opening) K at least ₁, K ₂, K ₃With more than one auxilliary contact (often opening) K ₄, the pull-in winding voltage of auxiliary contactor J is 220V, and a contact (often opening) J is arranged ₁The pull-in winding of main contactor K is through the contact J of auxiliary contactor ₁Be connected to (as A and B phase) between line its main contact K ₁, K ₂, K ₃Be connected on the motor major loop; The pull-in winding of auxiliary contactor J has been connected in series start button (often opening) D ₁And stop botton (normally closed) D ₂Be connected to alternate (relatively), auxilliary contact (the often opening) K of main contactor K as C ₄And the startup that is connected in the auxiliary contactor loop meets button D ₁On.When initial condition, main and auxiliary contactor K and J (the contact K that all do not power ₁, K ₂, K ₃, K ₄And J ₁All obstructed, main and auxiliary contactor loop no current passes through), feeder line is not powered to motor.When power supply is normal, press start button D ₁, fusible link, the start button D of C phase power supply in the auxiliary contactor loop ₁With stop botton D ₂To auxiliary contactor J coil power supply, contact J ₁Adhesive, A, B phase power supply are to main contactor K coil power supply, contact K ₁, K ₂, K ₃, K ₄All adhesives, motor powered operation, the self-locking of auxiliary contactor loop.When pressing stop botton D ₂, auxiliary contactor J coil losing electricity, contact J ₁Discharge main contactor K coil losing electricity, contact K ₁, K ₂, K ₃And K ₄Discharge, motor breaks away from power supply and shuts down.

When A, B have phase fusible link fusing, main contactor K coil losing electricity, contact K mutually ₁, K ₂, K ₃And K ₄Discharge, motor breaks away from power supply and shuts down; As the fusing of C phase fusible link, auxiliary contactor J coil losing electricity, contact J ₁Discharge main contactor K coil losing electricity, contact K ₁, K ₂, K ₃And K ₄All discharge, cut off motor power, motor has been realized open phase protection.

Power supply any one does not have electricity mutually before starting, and then the utility model can guarantee and will not start, and does not have electricity mutually as A or B, and the main contactor loop does not power, main contact K ₁, K ₂And K ₃Not adhesive, motor runs out of; Do not have electricity mutually as C, the auxiliary contactor loop does not power, its contact J ₁Not adhesive, the main contactor loop does not also have electricity, main contact K ₁, K ₂And K ₃Also not adhesive, motor run out of electricity equally, have realized the open-phase protection to motor.

The utility model compared with the prior art its advantage is:

(1) adopt simple main and auxiliary contactor combination to realize normal production and life have been safeguarded in the practical protection of the lacking of miniature motor, the phase failure;

(2) save a large amount of motor maintenance costs.

Description of drawings

Fig. 1 be the utility model with external circuit be connected electrical schematic diagram (being electric principle part of the present utility model in the dotted line)

Embodiment

The utility model is made up of two A.C. contactors, and the pull-in winding voltage of main contactor K is 380V, and three main contacts (often opening) K is arranged ₁, K ₂, K ₃With two auxilliary contacts (often opening) K ₄, K ₅, the pull-in winding voltage of auxiliary contactor J is 220V, and a contact (often opening) J is arranged ₁The pull-in winding of main contactor K is through the contact J of auxiliary contactor ₁Be connected to (as A and B phase) between line its main contact K ₁, K ₂, K ₃Be connected on the motor major loop; The pull-in winding of auxiliary contactor J has been connected in series start button (often opening) D ₁, stop botton (normally closed) D ₂Be connected to alternate (relatively) with fusible link, auxilliary contact (the often opening) K of main contactor K as C ₄And the startup that is connected in the auxiliary contactor loop meets button D ₁On, another auxilliary contact K ₅Receive on the power supply by an indicator light.When initial condition, main and auxiliary contactor K and J all do not power, contact K ₁, K ₂, K ₃, K ₄, K ₅And J ₁All obstructed, main and auxiliary contactor loop no current passes through), feeder line is not powered to motor M, and indicator light does not work.When power supply is normal, press start button D ₁, fusible link, the start button D of C phase power supply in the auxiliary contactor loop ₁With stop botton D ₂To auxiliary contactor J coil power supply, contact J ₁Adhesive, A, B phase power supply are to main contactor K coil power supply, contact K ₁, K ₂, K ₃, K ₄, K ₅All adhesives, motor M powered operation, the self-locking of auxiliary contactor loop, indicator light is bright.When pressing stop botton D ₂, auxiliary contactor J coil losing electricity, contact J ₁Discharge main contactor K coil losing electricity, contact K ₁, K ₂, K ₃, K ₄, K ₅Discharge, motor M breaks away from power supply and shuts down.

When A, B have phase fusible link fusing, main contactor K coil losing electricity, contact K mutually ₁, K ₂, K ₃, K ₄And K ₅Discharge, motor M breaks away from power supply and shuts down; As the fusing of C phase fusible link, auxiliary contactor J coil losing electricity, contact J ₁Discharge main contactor K coil losing electricity, contact K ₁, K ₂, K ₃And K ₄, K ₅All discharge, cut off motor power, M has realized open phase protection to motor.

Still what one does not have electricly power supply mutually before starting, and then the utility model can guarantee and will not start, and does not have electricity mutually as A or B, and the main contactor loop does not power, main contact K ₁, K ₂And K ₃Not adhesive, motor runs out of; Do not have electricity mutually as C, the auxiliary contactor loop does not power, its contact J ₁Not adhesive, the main contactor loop does not also have electricity, main contact K ₁, K ₂And K ₃Also not adhesive, motor M runs out of electricity equally, has realized the open-phase protection to motor.

Claims

1. a two magnetic actuator is made up of A.C. contactor, it is characterized in that:

1. combined by a main contactor K and an auxiliary contactor J, the pull-in winding voltage of main contactor K is 380V, has at least three often to open main contact K ₁, K ₂, K ₃Assist contact K with more than one often opening ₄, the pull-in winding voltage of auxiliary contactor J is 220V, and a normal opened contact J is arranged ₁

2. the pull-in winding of main contactor K is through the contact J of auxiliary contactor ₁Be connected between line and line, be serially connected with start button D in the pull-in winding of auxiliary contactor J and the external circuit ₁With stop botton D ₂Be connected between phase and center line;

3. the main contact K of main contactor K ₁, K ₂, K ₃Be connected on the motor M major loop auxilliary contact K ₄And the startup that is connected in the auxiliary contactor loop meets button D ₁On.