CN201126960Y

CN201126960Y - Electronic type simple motor protector

Info

Publication number: CN201126960Y
Application number: CNU2007201845138U
Authority: CN
Inventors: 蔡甫寒; 周挺巧; 杨立
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-10-21
Filing date: 2007-10-21
Publication date: 2008-10-01
Anticipated expiration: 2017-10-21

Abstract

The utility model discloses an electric motor protecting device, especially an electronic simple motor protecting device. Characterized in that the shell is arranged with a current mutual inductor and an electronic circuit board which are connected; the electronic circuit board is arranged with a power source circuit and a signal commutating amplifying circuit; the signal commutating amplifying circuit is divided into four parts: one part is connected to the test circuit; one part is connected to the overload protecting circuit; one part is connected to the starting delay circuit; one part is connected to the reposition circuit; the overload protecting circuit is connected to the overload protecting setting circuit and the action delay circuit; the action delay circuit is also connected to the starting delay setting circuit and the drive output circuit; the starting delay circuit is also connected to the starting delay setting circuit; the power source circuit is electrically connected to the circuits respectively, forming an integral electronic simple electric motor protector. The structure is quite simple and the functions are various; the protection is reliable which can be extensively used in the electric motor and the appliance protecting field.

Description

Electronic Simple Motor Protector

Technical field

The utility model relates to motor protection equipment, particularly Electronic Simple Motor Protector.

Background technology

Motor protector structure more complicated in the past, components and parts are many, and therefore the cost height need be improved on structure.

The utility model content

The purpose of this utility model is at above-mentioned defective, and a kind of Electronic Simple Motor Protector is provided.Simple in structure, multiple functional, protection is provided in the time of moving motor effectively.

The technical solution of the utility model is an Electronic Simple Motor Protector, it is characterized in that being equipped with in casing current transformer and electronic circuit board and both electrical connections; Power circuit and signal rectification amplifying circuit are installed on electronic circuit board, and the signal rectification amplifying circuit is divided into four the tunnel: the one tunnel and is connected with test circuit, and one the tunnel is connected with overload protecting circuit, and one the tunnel is connected with starting delay circuit, and one the tunnel is connected with reset circuit; Overload protecting circuit is connected with the overload protection initialization circuit and is connected with the action delay circuit, and the action delay circuit also is connected with the driving output circuit with the action delay initialization circuit, and starting delay circuit is connected with the starting delay setting circuit again; Power circuit is electrically connected with foregoing circuit respectively, constitutes Electronic Simple Motor Protector on the whole.

Said current transformer is two core-theaded type current transformers; Said signal rectification amplifying circuit is current transformer L1, L2 lead-out wire each two resistance R 1A, R1B in parallel and R2A, R2B respectively on it, and the conveying detection signal; It is common end grounding that two current transformers have an end to connect; the other end respectively connect a resistance R 3 and R5; the negative input end that respectively connects an amplifier IC1 respectively; detected current signal respectively through 2 IC1 of amplifier carry out that the negative feedback rectification is amplified and and connect output; again after capacitor C 3 filtering; one the tunnel enters amplifier comparator IC2 positive input terminal; be connected to overload protection at the IC2 negative input end and set potentiometer VR1; another road enters amplifier comparator IC2 positive input terminal; its negative input end obtains reference voltage by electric resistance partial pressure; potentiometer VR3 and C6 form overload action delay circuit; the overload action delay is set potentiometer VR3 and is set to capacitor C 6 charging delay times; N1 is a testing button; N2 is a reset button, and power circuit is by capacitor C 1A; the big electric current of C1B and the spike of RK high frequency suppresses resistance; the rectification of D1-4 bridge; C2 and C10 filter capacitor; WD2 and WD3 voltage-stabiliser tube are formed.

The utility model has the advantages that current transformer and corresponding electronic circuit board only to be installed in the casing and electronic devices and components are installed to constitute, so structure is quite simple; Diverse in function, function such as overload protection is arranged, test, reset.

Description of drawings

Fig. 1 is the utility model circuit block diagram.

Fig. 2 is the utility model circuit theory diagrams.

Embodiment

Further specify embodiment below in conjunction with accompanying drawing.

With reference to Fig. 1, as shown, the utility model is electrically connected by the electronic devices and components on the current transformer and the corresponding electronic circuit board that are installed in the casing and both to be formed.Complete machine connects order and is current transformer, signal rectification amplifying circuit, is to be divided into four the tunnel: the one tunnel again at the signal rectifier current amplifier to be connected with test circuit then, and one the tunnel is connected with overload protecting circuit; One the tunnel is connected with starting delay circuit, and one the tunnel is connected with reset circuit; Overload protecting circuit is connected with a year overload protection initialization circuit, is connected with the action delay circuit again, and the action delay circuit also is connected with the driving output circuit with the action delay initialization circuit; Starting delay circuit is connected with the starting delay setting circuit again; Power circuit is electrically connected with foregoing circuit respectively, constitutes Electronic Simple Motor Protector on the whole.

With reference to Fig. 2 is the circuit theory diagrams of complete machine.As shown; L1 on two core-theaded type instrument transformers; the L2 lead-out wire is each two resistance R 1A in parallel respectively; R1B; R2A; R2B gets sensed current signal; it is common port together that one end of two instrument transformers connects; respectively a connect resistance R 3 and R5 of the other end connects the negative input end of amplifier IC1-I and IC1-2 respectively; the current signal that detects carries out negative feedback rectification amplification through amplifier IC1-1 and IC1-2 respectively; then and connect output; after capacitor C 3 filtering, one the tunnel enter amplifier comparator IC2-2 positive input terminal again; its negative input end is set potentiometer VR1 control by overload protection; when the electromotor overload current signal surpasses the overload protection set point; amplifier comparator IC2-2 handles counter-rotating and is output as high level; at this moment it is bright to carry overload light LED1; potentiometer VR3 and capacitor C 6 are formed overload action delay circuit; through overload action delay circuit; after overload action delay setting potentiometer VA3 sets to electric capacity charging delay time; amplifier comparator IC2-1 output is reversed to high level; use triode Q1 to shut down by control relay J1 outage; indicator light LED2 extinguishes simultaneously; D7; D8; D9 rises to high level with the IC2-2 positive input terminal, makes relay keep the outage stopped status.

N1 is a testing button, looks into the positive input terminal that a suitable overload signal is added in amplifier IC2-2 when depressing N1, and the result is that the protector overload is shut down, and reaches the purpose of test protector; N2 is a reset button, when depressing N2, and the IC2-4 output low level, IC2-1 output also is low level, drives output relay adhesive and maintenance, and indicator light LED1 goes out, and LED2 is bright, and IC2-2, IC2-3 output at this moment also is low level.

The current signal that detects is through amplifier IC1-1; IC1-2 carry out rectifier banish big filtering after another road enter amplifier comparator IC1-2 positive input terminal; its negative input end obtains reference voltage by electric resistance partial pressure; current signal is greater than reference voltage when motor starting or running; amplifier comparator IC2-3 exports high level; in the delay time that potentiometer VR2 sets when starting keeps away; amplifier comparator IC2-4 is output as low level; diode D10 is clamped to low level with amplifier comparator IC2-1 positive input terminal; starting is dodged in the time and can not shut down for overload because of the big mistake of starting current; dodge the delay time end of potentiometer VR2 setting in starting after; amplifier comparator IC2-4 is output as high level, and circuit returns to the standby condition of overload protection.

Power circuit be AC power through C1A, C1B step-down, the big electric current of RK high frequency spike suppress, behind the D1-4 bridge rectifier stream, again through C2, C10 filtering, positive 24V and negative 24V DC power supply are exported in WD2, WD3 voltage stabilizing.

Claims

1, Electronic Simple Motor Protector is characterized in that being equipped with current transformer and electronic circuit board in casing and both are electrically connected; Power circuit and signal rectification amplifying circuit are installed on electronic circuit board, and the signal rectification amplifying circuit is divided into four the tunnel: the one tunnel and is connected with test circuit, and one the tunnel is connected with overload protecting circuit, and one the tunnel is connected with starting delay circuit, and one the tunnel is connected with reset circuit; Overload protecting circuit is connected with the overload protection initialization circuit and is connected with the action delay circuit, and the action delay circuit also is connected with the driving output circuit with the action delay initialization circuit, and starting delay circuit is connected with the starting delay setting circuit again; Power circuit is electrically connected with foregoing circuit respectively, constitutes Electronic Simple Motor Protector on the whole.

2,, it is characterized in that said current transformer is two core-theaded type current transformers according to the said Electronic Simple Motor Protector of claim 1; Said signal rectification amplifying circuit is current transformer L1, L2 lead-out wire each two resistance R 1A, R1B in parallel and R2A, R2B respectively on it, and the conveying detection signal; It is common end grounding that two current transformers have an end to connect; the other end respectively connect a resistance R 3 and R5; the negative input end that respectively connects an amplifier IC1 respectively; detected current signal respectively through 2 IC1 of amplifier carry out that the negative feedback rectification is amplified and and connect output; again after capacitor C 3 filtering; one the tunnel enters amplifier comparator IC2 positive input terminal; be connected to overload protection at the IC2 negative input end and set potentiometer VR1; another road enters amplifier comparator IC2 positive input terminal; its negative input end obtains reference voltage by electric resistance partial pressure; potentiometer VR3 and C6 form overload action delay circuit; the overload action delay is set potentiometer VR3 and is set to capacitor C 6 charging delay times; N1 is a testing button; N2 is a reset button, and power circuit is by capacitor C 1A; the big electric current of C1B and the spike of RK high frequency suppresses resistance; the rectification of D1-4 bridge; C2 and C10 filter capacitor; WD2 and WD3 voltage-stabiliser tube are formed.