CN2347180Y

CN2347180Y - Phase failure electronic warner for electric motor

Info

Publication number: CN2347180Y
Application number: CN 98246686
Authority: CN
Inventors: 奉继宝
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-11-26
Filing date: 1998-11-26
Publication date: 1999-11-03
Anticipated expiration: 2008-11-26

Abstract

The utility model relates to a phase failure warning protection device for a motor. Three mutual inductance coils and three relays are respectively adopted to do independent work for the corresponding three-phase lines of the motor; each indicating diode and a buzzer are connected in series and are formed into a set of warning unit, three sets of warning units are connected end to form delta connection, and the connecting point of the delta connection is respectively connected with the tongue pieces of the middle parts of the three relays; thus, by the structure of the utility model, the warning sound can be sent out exactly and timely during the operation of the motor when the power supply of any phase of the motor is lacked. The utility model has the advantages of convenient installation, stable performance, small size, low cost, etc.

Description

Motor phase failure electronic alarm

The utility model relates to the urgent protection warning device that prevents the motor phase failure.

Traditional motor open phase protection generally will connect external power, has directly with motor and gets in touch, and the installation site is restricted, and installs more complicated.Although the protective device that has at present adopts the AC mutual induction principle and save external power supply, its operating circuit is complicated, and volume structure is big, and operation stability is relatively poor.For this reason, be necessary under the prerequisite of the design advantage that keeps AC mutual induction, the conventional motors open phase protection to be improved.

The purpose of this utility model is for overcoming the deficiencies in the prior art part, the simple uniqueness of a kind of circuit being provided, motor phase failure electronic alarm easy to connect, stable performance is installed.

The purpose of this utility model is achieved by the following technical solution: motor phase failure electronic alarm, be made of housing, battery, three mutual inductors, relay, rectification amplifying circuit, hummer, indication diode etc., special feature is that three mutual inductors work alone with the triple-phase line of three relay respective motor respectively; Each only indicates diode and a hummer polyphone to form a group alarm unit, and three group alarm unit are connected to form delta connection from beginning to end, and leg-of-mutton contact is connected with the middle tongue piece of three relays respectively.Further, relay adopts five pin double-contact relays.

Below in conjunction with drawings and Examples structure of the present utility model and advantage are described further.

Fig. 1 is an electrical schematic diagram of the present utility model.

Referring to Fig. 1, three mutual inductor LA, LB, LC are arranged in the housing of present embodiment, each mutual inductor is connected into three independently operating circuits through bridge rectifier amplifying circuit and three relay J A, JB, JC respectively.Relay J A, JB, JC adopt five pin double-contact relays, and its upper contact all is connected on the positive pole of battery V, and its lower contact all is connected the negative pole of battery V, and when motor stopped, the middle tongue piece of relay J A, JB, JC upwards was communicated with upper contact; When motor started, middle tongue piece was then downward, was communicated with lower contact.

Alarm unit is made up of an indication diode DA and a hummer BA, indicate diode DB, DC and hummer BB, BC to form two group alarm unit in addition for two equally in addition, three group alarm unit are connected to form delta connection from beginning to end, and leg-of-mutton contact is connected with the middle tongue piece of relay J A, JB, JC respectively.

Because triple-phase line A, B, the C of motor pass mutual inductor LA, LB, LC respectively, when the outage of a phase line wherein, for example A phase, the mutual inductor LA electric current that loses induction, cause relay J A outage, tongue piece return is communicated with lower contact in the middle of it, thereby make the indication diode DA forward conduction in the triangular element, hummer BA powers alarm; Meanwhile, because B, the C of motor still have electric current mutually, relay J B, JC still keep "on" position, and corresponding alarm unit ends.Equally, when motor B phase (or C phase) disconnects, correspondingly indicate diode DB (or DC), buzzing BB (or BC) forward conduction is realized sound and light alarm.

The utility model can in time remind the operative employee to cut off the electricity supply, examine in the early stage of motor fault Line inspection road, have installation simply, unrestricted etc. the advantage of external circuit, position not, and Cheap, circuit is unique, little, the stable performance of volume, not power consumption of static state is electronic mechanism The protection equipment of thinking.

Claims

1, motor phase failure electronic alarm, be made of housing, battery, three mutual inductors, relay, rectification amplifying circuit, hummer, indication diode etc., it is characterized in that: three mutual inductors work alone with the triple-phase line of three relay respective motor respectively; Each only indicates diode and a hummer polyphone to form a group alarm unit, and three group alarm unit are connected to form delta connection from beginning to end, and leg-of-mutton contact is connected with the middle tongue piece of three relays respectively.

2, alarm according to claim 1 is characterized in that relay adopts five pin double-contact relays.