CN2087836U

CN2087836U - Phase-failure protector for motor

Info

Publication number: CN2087836U
Application number: CN 91205930
Authority: CN
Inventors: 张旭好
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-04-10
Filing date: 1991-04-10
Publication date: 1991-10-30

Abstract

The utility model relates to a phase-failure protector for motor which is used to prevent a running motor from being burnt because of phase interruption. The phase-failure protector for motor is composed of an AC contactor CJ, a filter circuit of voltage reduction and rectification which is composed of a transformer B, a rectifying diode D and a filtering capacitor C, a low voltage DC relay J, a running switch K which is used to control the working state of the phase-failure protector for motor, an outer shell (1) of protector, etc. The utility model has the advantages of simple structure, convenient operation, high reliability and low cost, and can control simultaneously the state of three phase wires. The phase-failure protector for motor is suitable for the running phase interruption protection of various types of three-phase motors.

Description

Phase-failure protector for motor

The utility model belongs to Protector for electric appliances, especially a kind of phase failure protector of electric motor that prevents motor in service because of circuit inter-burnout-ing.

Existing phase failure protector of electric motor exists complex structure, uses inconvenience, the high deficiency of manufacturing cost.And adopt A.C. contactor to make open phase protection (as shown in Figure 1), and owing to only use two phase lines to introduce working power, when the 3rd phase line outage, relay CJ still works, still adhesive of contact K is so can not do the control of power supply state to three phase lines simultaneously.

The purpose of this utility model be to provide a kind of simple in structure, easy to use, reliability is high, cheap for manufacturing cost, can make the phase failure protector of electric motor of power supply state control to three phase lines simultaneously.

Phase failure protector of electric motor of the present utility model is by A.C. contactor CJ; Decompression rectifier filter circuit with transformer B, rectifier diode D and filter capacitor C composition; The operation mains switch K and the protector outer casing formations such as (1) of low-voltage direct relay J and control phase failure protector operating state.

Below in conjunction with accompanying drawing to the utility model further instruction.

Fig. 2 is a profile schematic diagram of the present utility model;

Fig. 3 is control circuit figure of the present utility model;

Shown in Fig. 2 and 3, phase failure protector of electric motor of the present utility model comprises and being connected on two phase lines, the decompression rectifier filter circuit of being made up of transformer B, rectifier diode D and filter capacitor C; The dc supply of coil two terminations behind rectifying and wave-filtering, switch contacts Z input connects the low-voltage direct relay J of the 3rd phase line; Coil two ends are connected to the A.C. contactor CJ of arbitrary phase line in direct current relay J switch contacts Z output and all the other two phase lines; And the mains switch K of control phase failure protector operating state, the indicator light (2) and the shell (1) of indication protector operating state, tagblock formations such as (3).

Toggle switch K, two phase line input power supplys that insert from tagblock (3) become low-voltage dc power supply through decompression rectifier filter circuit, with this DC power supply cut-in relay J coil two ends, make its charged work, and make switch contacts Z adhesive.Since switch contacts Z adhesive, A.C. contactor CJ coil incoming transport power supply, A.C. contactor CJ coil is charged, three normally open contact F closures that are serially connected with on the motor YD power input line, and motor YD gets electric starting to work.When the phase line A phase failure is powered, the CJ coil losing electricity, normally open contact F throws off, and motor YD input power supply is cut and is quit work; When phase line B or C phase failure power supply, the input of relay J coil non-transformer, switch contacts Z is in disengaged condition, thereby makes the CJ coil losing electricity, and normally open contact F also throws off, and motor YD input power supply is cut off and quits work.After the phase line connection of the phase failure restored electricity, protector was promptly resumed work.The phase line power supply state shows by indicator light (2).

Phase failure protector of electric motor of the present utility model has simple in structure, and is easy to use, and the reliability height is cheap for manufacturing cost, can make advantages such as power supply state control simultaneously to three phase lines, is applicable to various types of threephase motors do operation open phase protections.

Claims

1, a kind ofly can do power supply state control simultaneously, prevent the phase failure protector of electric motor of operating motor, it is characterized in that comprising because of circuit inter-burnout-ing to three phase lines:

A, be connected on two phase lines the decompression rectifier filter circuit of forming by transformer B, rectifier diode D and filter capacitor C;

The dc supply behind the rectifying and wave-filtering is inserted at b, coil two ends, and switch contacts Z input connects the low-voltage direct relay J of the 3rd phase line;

C, coil two ends are connected to arbitrary phase line in direct current relay J switch contacts Z output and all the other two phase lines, and three normally open contact F are serially connected with the A.C. contactor CJ on the motor YD power supply input phase line;

D, mains switch K;

E, protector outer casing (1).