CN201018349Y

CN201018349Y - Electric motor phase-lack protector

Info

Publication number: CN201018349Y
Application number: CNU200720005701XU
Authority: CN
Inventors: 王明和
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-02-16
Filing date: 2007-02-16
Publication date: 2008-02-06
Anticipated expiration: 2017-02-16

Abstract

The utility model relates to a phase lacking protector for a motor, which comprises a box body, a base and a wiring terminal arranged on the external base of the box body. Wherein, each phase electricity of the motor is added with a relay, totaling three relays. The normally open contact and the normally closed contact of the relay are used in parallel. The utility model has the advantages of the simple structure, the small volume, the light weight, the convenient installation and use, the wide application range and the reliable operation. The utility model is arranged in the outgoing line direction of the motor when used; whether the lacking phase of incoming electricity or the lacking phase caused by burning down the contact point of the contactor, the protector can control the power off of the coil of the contactor in order to make the motor not burned under the condition of lacking phase.

Description

Motor phase failure protection device

Technical field

The utility model relates to the protective device of three-phase alternating current, is specifically related to a kind of manually open phase protector of the threephase motor of control that is suitable for, and belongs to International Classification of Patents H02H7/08 " the emergency protective circuit device that is used for motor " technical field.

Background technology

Three-phase alternating-current motor can make motor coil overheated when phase-deficient operation, causes burn-down of electric motor.For the motor of avoiding taking place because of the motor phase-deficient operation damages.Several alternative open phase protector of motor in the prior art; it is assembled in the control circuit of device for switching compositions such as motor operation circuit and contactor, can be when the phase failure appear in the motor main circuit, the contact of cut-off switch electrical equipment; cut off the three phase mains of motor, and avoid burn-down of electric motor.But the structure of existing protector is formed comparatively complicated, the deployment cost height.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned deficiency of the prior art, provides on a kind of outlet direction that is installed in the motor contactor, the protection motor can be by any motor phase failure protection device that causes the former of phase shortage thereby burn.

The purpose of this utility model is realized by following technical scheme.

A kind of open phase protector of motor comprises the binding post that is provided with on box body, base and box body outside, the base.Be equipped with a relay on the electricity mutually in each of motor, be provided with three relays altogether.The normally opened contact of relay and normally-closed contact are in parallel to be used.

Promptly add a relay on the electricity mutually, be added with three relays on the three-phase,, join together respectively the normal battle and the normally closed point of three relays in each of motor.The normal battle and normally closed parallel connection use is with himself effect of thorough performance.

The utility model is simple in structure, and volume is little, and is in light weight, easy to install and use, and applied range is reliable.No matter be installed on the outlet direction of motor when it uses, be the incoming call phase shortage, or contacts of contactor burns the phase shortage that causes, the coil blackout that this protector can both control contactor, thus protected motor can not burn because of phase shortage.

Description of drawings

Fig. 1 is the external structure schematic diagram of the utility model open phase protector of motor;

Fig. 2 is circuit theory diagrams of the present utility model;

Fig. 3 is relay normally open contact and the normally-closed contact schematic diagram that uses in parallel.

Among the figure: 1. box body, 2. base, 3. binding post, 4. relay, 5. normally opened contact, 6. normally-closed contact.

Embodiment

Referring to each accompanying drawing, open phase protector of motor, profile is a box body 1, the bottom is provided with base 2, on the base 2 of box body 1 outside binding post 3 is set.

Be equipped with a relay 4 on the electricity mutually in each of motor, be provided with three relays 4 altogether.The normally opened contact 5 of relay 4 and normally-closed contact 6 in parallel uses.

Protector gets electric when machine operation, must not when motor is not worked.Must not when electricity, its three normally-closed contacts are associated in and constitute a path together; When protector gets when electric, three relay adhesives, three normal battles have become normally closed point, still are a path.Work as three-phase electricity, when no matter which was mutually obstructed, corresponding relays just had one to disconnect just because of not adhesive of outage in three closing points.The outage of master control contactor loop, contactor discharges, and button self-insurance point disconnects, and contactor is adhesive no longer, has thoroughly protected motor.

This protector is made up of three (220V) 380V relays, does not have any electronic component, and is simple in structure, long service life.

Claims

1. open phase protector of motor; it is characterized in that: it comprises, and box body (1), base (2) and box body (1) are outside, base (2) is gone up the binding post (3) that is provided with; be equipped with a relay (4) on the electricity mutually in each of motor, be provided with three relays (4) altogether.

2. open phase protector of motor according to claim 1 is characterized in that: described relay (4), its normally opened contact (5) and normally-closed contact (6) are in parallel to be used.