CN103532098A

CN103532098A - Electromotor integrative protector

Info

Publication number: CN103532098A
Application number: CN201310477585.1A
Authority: CN
Inventors: 王颐
Original assignee: NANJING OURGREEN ENERGY-SAVING TECHNOLOGY Co Ltd
Current assignee: NANJING OURGREEN ENERGY-SAVING TECHNOLOGY Co Ltd
Priority date: 2013-10-12
Filing date: 2013-10-12
Publication date: 2014-01-22

Abstract

The invention discloses an electromotor protector. The electromotor protector comprises a current transformer, a voltage transformer, a forward channel, a voltage setting module, an A/D (analog/digital) conversion module, a single-chip microcomputer, a current setting module and a relay execution module, wherein the current transformer is used for collecting current signals of an electromotor in real time; the voltage transformer is used for collecting voltage signals of the electromotor in real time; the forward channel is used for transmitting the received voltage signals and current signals to the voltage setting module in sequence; the voltage setting module is used for setting the received voltage signals and current signals; the A/D conversion module is used for comparing a received setting signal with a benchmark current value provided by the current setting module, generating a digital signal and transmitting the digital signal to the single-chip microcomputer; the single-chip microcomputer is used for analyzing and processing the received digital signal, transmitting the processed digital signal to a frequency output model, also generating a driving signal and transmitting the driving signal to the relay execution module; the current setting module is used for providing the benchmark current value for the A/D conversion module; the relay execution module is used for executing the switch-on/switch-off actions of the relay under the control of the driving signal transmitted by the single-chip microcomputer.

Description

A kind of integrated protector for electric motor

Technical field

The present invention relates to motor protection field, relate in particular to a kind of JDB motor protector.

Background technology

In modern production, along with improving constantly of production automation level, also more and more higher to the service requirement of motor.The electronic circuit that traditional motor protecting device is comprised of resolution element or integrated circuit mostly, due to device and circuit, all there are some problems in the reliability and sensitivity of protective circuit.Constantly perfect along with the continuous progress of science and technology and technique, for meeting the requirement of automated production, in the urgent need to exploitation with improve the control and protection equipment of motor, protects motor to have great significance to national economy in time, effectively, reliably.Therefore, develop that a kind of stable performance, protected species are complete, quick action, highly sensitive, good reliability, convenient and practical comprehensive motor protector be the key that solves motor protection problem.Along with the develop rapidly of electronic technology, the intellectuality of Protection Technology becomes inexorable trend.With single-chip microcomputer design motor protecting device, become possibility.

Summary of the invention

In order to overcome the deficiencies in the prior art, the invention provides a kind of JDB motor protector, can protect in time, effectively, reliably motor.

For achieving the above object, the present invention takes following technical scheme:

, comprise current transformer, voltage transformer, preceding paragraph passage, voltage adjust module, current calibration module, A/D modular converter, single-chip microcomputer, relay Executive Module, frequency output module and reseting module; Current transformer, for Real-time Collection motor current signal, and sends to preceding paragraph passage by current signal; Voltage transformer, for Real-time Collection motor voltage signal, and sends to preceding paragraph passage by voltage signal; Preceding paragraph passage, for sending to the voltage signal receiving and current signal successively the voltage module of adjusting; The voltage module of adjusting, for the voltage signal receiving and current signal are adjusted, and generates the signal of adjusting and sends to A/D modular converter; A/D modular converter, compare, and generating digital signal sends to single-chip microcomputer for the reference current value that adjust signal and the current calibration module that receive are provided; Single-chip microcomputer, for the digital signal receiving is carried out to analyzing and processing, and sends to frequency output module by the digital signal after processing, and also generates and drives signal to send to relay Executive Module; Current calibration module, for providing reference current value to A/D modular converter; Relay Executive Module, for carrying out the action of relay cut-off/close under the driving signal controlling sending at single-chip microcomputer; Frequency output module, arrives control desk for the digital data transmission that single-chip microcomputer is sent; Reseting module, for realizing motor manual reset.

Further, single-chip microcomputer is AT89C52 chip.

Further, A/D modular converter is MAX197 chip.

Beneficial effect: (1) the present invention has the motor basic fault defencive functions such as short circuit, overload, disconnected phase, electric leakage, and its protective feature is stable, reliable.(2) the present invention has increased the frequency delivery outlet of signal; realize remote programmable, setting parameter; make it to become the Novel electric appliance product that can communicate by letter, can be respectively used to computer controlled network or distributed field bus system, become protection and on-line monitoring and management system.(3) setting current linearity is adjusted, the sign on dial by isodose, many lattice number, be evenly arranged.User can set according to the rated current size of motor, without adjusting the starting time, once sets successfully, has overcome at present a shortcoming for some like product palpus band year debugging both at home and abroad, and user sets setting current accurately, conveniently.(4) product price of the present invention is low, performance good, has very high cost performance.(5) volume is little, and installation dimension is identical with thermal relay.

Accompanying drawing explanation

Fig. 1 is fundamental diagram of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the present invention is further described.

As shown in Figure 1, a kind of JDB motor protector, comprises current transformer, voltage transformer, preceding paragraph passage, voltage adjust module, current calibration module, A/D modular converter, single-chip microcomputer, relay Executive Module, frequency output module and reseting module; Current transformer, for Real-time Collection motor current signal, and sends to preceding paragraph passage by current signal; Voltage transformer, for Real-time Collection motor voltage signal, and sends to preceding paragraph passage by voltage signal; Preceding paragraph passage, for sending to the voltage signal receiving and current signal successively the voltage module of adjusting; The voltage module of adjusting, for the voltage signal receiving and current signal are adjusted, and generates the signal of adjusting and sends to A/D modular converter; A/D modular converter is MAX197 chip, compare, and generating digital signal sends to single-chip microcomputer for the reference current value that adjust signal and the current calibration module that receive are provided; Single-chip microcomputer is AT89C52 chip, for the digital signal receiving is carried out to analyzing and processing, and the digital signal after processing is sent to frequency output module, also generates and drives signal to send to relay Executive Module; Current calibration module, for providing reference current value to A/D modular converter; Relay Executive Module, for carrying out the action of relay cut-off/close under the driving signal controlling sending at single-chip microcomputer; Frequency output module, arrives control desk for the digital data transmission that single-chip microcomputer is sent; Reseting module, for realizing motor manual reset.

In order to obtain in time the ruuning situation of motor, this protector has adopted three current transformers, and electric current is carried out to Real-time Collection.Current signal passes to protector by mutual inductor sample; through over commutation, enter in A/D conversion chip MAX197; together with after the current value obtaining and setting current being obtained to reference current value after MAX197 sampling and being converted to digital quantity, send in single-chip microcomputer 89C52 and process; by real-time sampling, the current value of major loop and reference current value are compared to output, thereby judge the operating state of motor and output signal is entered to freq converting circuit.MAX197 is the A/D acquisition chip of 12, has very high precision, and this is the main cause that this circuit adopts it, is used for improving the precision of motor protector.

When motor being detected and break down, single-chip microcomputer trigger relay has moved protection output, and carries out fault judgement by status indicator lamp.Avoid the motor re-lighting of nonserviceabling, the damage of aggravation motor, after fault is got rid of, resets by MAX813L reset chip, and realization is restarted.The indicator light of installing on protector is used as respectively working power indication and the motor fault indication of protector.

The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims

1. a motor protector, is characterized in that: comprise current transformer, voltage transformer, preceding paragraph passage, voltage adjust module, current calibration module, A/D modular converter, single-chip microcomputer, relay Executive Module, frequency output module and reseting module;

Described current transformer, for Real-time Collection motor current signal, and sends to preceding paragraph passage by current signal;

Described voltage transformer, for Real-time Collection motor voltage signal, and sends to preceding paragraph passage by voltage signal;

Described preceding paragraph passage, for sending to the voltage signal receiving and current signal successively the voltage module of adjusting;

The described voltage module of adjusting, for the voltage signal receiving and current signal are adjusted, and generates the signal of adjusting and sends to A/D modular converter;

Described A/D modular converter, compare, and generating digital signal sends to single-chip microcomputer for the reference current value that adjust signal and the current calibration module that receive are provided;

Described single-chip microcomputer, for the digital signal receiving is carried out to analyzing and processing, and sends to frequency output module by the digital signal after processing, and also generates and drives signal to send to relay Executive Module;

Described current calibration module, for providing reference current value to A/D modular converter;

Described relay Executive Module, for carrying out the action of relay cut-off/close under the driving signal controlling sending at single-chip microcomputer;

Described frequency output module, arrives control desk for the digital data transmission that single-chip microcomputer is sent;

Described reseting module, for realizing motor manual reset.

2. a kind of motor protector according to claim 1, is characterized in that: described single-chip microcomputer is AT89C52 chip.

3. a kind of motor protector according to claim 1, is characterized in that: described A/D modular converter is MAX197 chip.