CN2629047Y

CN2629047Y - Computer testing electric machine system

Info

Publication number: CN2629047Y
Application number: CN 02295766
Authority: CN
Inventors: 张玉安
Original assignee: Harbin Engineering University
Current assignee: Harbin Engineering University
Priority date: 2002-12-30
Filing date: 2002-12-30
Publication date: 2004-07-28
Anticipated expiration: 2012-12-30

Abstract

The utility model directs to a computer-aided electric motor detection system consisting of sensors measuring an electric motor temperature, a pressure, an AC current, an AC voltage, a DC current, a DC voltage; a differential amplification low-pass filtering circuit, an A/D conversion circuit, a plurality of branched computers, a series communication interface circuit and a host computer. The host computer equipped in the detection center is connected with the on-spot branched computers through the series communication interface circuit. The host computer and the branched computers are coordinated to operate and to finish in on-time sampling, monitoring and processing various multi-channel signals parameters under the operation mode. After this, the responding digital signals are stored, analyzed, displayed and printed in the host computer in order to realize the online detection and treatment of the various parameters under the operation mode of the electric motor. The utility model has the advantages of a high precision and a strong resistance to the interference; and, implements the measurements of the various parameters of the a plurality of electric motors, thus greatly enhancing the working efficiency; can be widely used for the manufacturers of various electric motors and the electric detection departments.

Description

The COMPUTER DETECTION electric system

One, technical field

This utility model relates to a kind of COMPUTER DETECTION electric system of using.

Two, background technology

At present domestic middle and small motor factory is a lot, and the detection of its parameter of motor product of producing is very lack of standardization, largely influenced the motor product outgoing, also adopted artificial instrument method to detect the parameter of electric machine as many motors factory, its shortcoming is that work efficiency is very low and accuracy of detection is not high; Existing a kind of Microcomputer Detecting train electric system " be to replace artificial instrument to detect parameter of electric machine equipment; improved production efficiency; because the on-the-spot distance of inspection center and detected motor is far away though alleviated artificial labour intensity to a certain extent with microcomputer; and the detected parameter of electric machine is to adopt the analog signal transmission mode; so the measured signal distortion is big; disturbed ambassador's accuracy of detection still not high, and can only detect a motor at every turn, and the detection of parameter also is affected work efficiency one by one, therefore only adopted, fail generally to be promoted the use of by minority electrical machinery plant.

Three, summary of the invention

The utility model is by a main control computer in the inspection center and be arranged on the secondary detection system that many computing machine extension sets producing the electromechanical testing scene constitute principal and subordinate's distribution, formation is with the master-slave mode co-ordination, it directly carries out signal Processing by the computing machine extension set with the simulating signal of the detected at the scene motor parameter of sensing technology, just the motor simulation signal that records is become digital signal in test site, be transferred to then in the main control computer of inspection center, the various parameters of motor that detect are stored, analyze, show and printing, realized the motor online detection of parameter and processing under running status, therefore can improve accuracy of detection and system's antijamming capability of motor parameter greatly, and can realize a plurality of parameters and multiple electric motors are detected simultaneously, can increase work efficiency greatly.

The formation of this utility model comprises: sensor [1], difference amplification low pass circuit [2], A/D change-over circuit [3], computing machine extension set [4], serial interface circuit [5] and main control computer [6], wherein sensor [1] is according to the parameter that motor detected being chosen corresponding sensor as measuring the operating temperature of motor, pressure, AC current-voltage and DC current voltage with regard to corresponding temperature sensor, pressure transducer, alternating current or voltage transformer (VT), DC current shunt and the dc voltage divider etc. chosen, visible accompanying drawing 1 and accompanying drawing 2.The parameter of difference amplification low pass circuit [2] is to determine according to institute's measured motor parameter, temperature as will move the time to motor, 6 parameters such as pressure alternating current alternating voltage, DC current and DC voltage are measured, circuit [2] will select for use 6 with sensor [1] institute corresponding one by one being connected of measured motor parameter, and respectively each parameter signals of motor that is detected is amplified and filtering; The analog electrical signal that A/D change-over circuit [3] is used for recording changes digital signal into and is sent to computing machine extension set [4] and carries out signal Processing, is transferred in the main control computer [6] by serial interface circuit [5] then the digital signal of detected motor parameter is stored, analyzes, shown and prints.

Its principle of work of this utility model is, sensor [1], difference amplification low pass circuit [2], A/D change-over circuit [3] and computing machine extension set [4] are placed on by the measured motor scene, main control computer [6] is placed on inspection center, signal transmission between test site and the inspection center is to finish by serial interface circuit [5], wherein difference amplification low pass circuit [2] and A/D change-over circuit [3] and calculating extension set [4] can be assembled into one becomes an extension set, can realize the detection of a plurality of parameters to a motor.Simultaneously multiple electric motors is detected as required, can assemble many extension sets and realize that correspondence detects simultaneously to multiple electric motors respectively one by one.By serial interface circuit [5] signal conveys that records is stored respectively in main control computer [6] then, show and printing, so this utility model can realize the testing to the various parameters of multiple electric motors, with a plurality of parameters with a motor of a branch machine testing is example, when the scene of detecting at motor is detected its various parameters, temperature sensor with the sensor [1] of this utility model, pressure transducer, alternating current and voltage transformer (VT), DC current shunt and dc voltage divider be connected by the measured motor appropriate section, energized makes motor and COMPUTER DETECTION electric system be in operation and duty respectively then, sensor [1] is continuously respectively with the temperature of the motor measured, pressure, alternating current and voltage, every electric signal such as DC current and voltage is sent to difference amplification low pass circuit [2] respectively, amplify through signal, be sent to A/D change-over circuit [3] after filtering or the rectification amplification filtering again respectively the analog signal conversion of the motor parameters that records is become digital signal, after passing through computing machine extension set [4] then every digital signal being compressed processing, passing through serial interface circuit [5] more respectively is sent in the main control computer [6] in the inspection center and respectively the every signal of measured motor is stored, analyze, show and printing, the performance index of the various parameters of the very high motor of precision are provided for engineering technical personnel.Because the signal transmission is to adopt digital signal, so antijamming capability is strong, distorted signals is little, simultaneously can dispose a plurality of computing machine extension sets [4] in test site as required, simultaneously multiple electric motors is detected, improved work efficiency greatly, so this utility model can be widely used in all kinds of motor production plants or motor detects unit.

Four, description of drawings

Accompanying drawing 1 COMPUTER DETECTION electric system structural principle block scheme

Accompanying drawing 2 COMPUTER DETECTION electric system circuit block diagrams

The difference amplification low pass circuit theory diagrams of accompanying drawing 3 COMPUTER DETECTION electric systems

Five, embodiment

When at the scene the every parameter of motor being detected, at first make by measured motor and be in the operation duty, the COMPUTER DETECTION electric system can be provided with following several detection signal according to user's needs: temperature signal, pressure signal, alternating current and voltage signal, DC current and voltage signal etc., for these different physical quantitys, sensor [1] just needs the configuration temperature sensor, pressure transducer, alternating current and voltage transformer (VT), DC current shunt and dc voltage divider, these sensors can select for use corresponding product sensor to get final product on market according to institute's measured motor model, to the electric signal of difference amplification low pass circuit [2] according to the measured motor different physical quantities of different sensors, carry out different processing modes and (see accompanying drawing 2,3), A1 in its accompanying drawing 3, A2, A3 constitutes differential amplifier, because transducing signal is added in the end in the same way of two arithmetical unit, therefore, have very high input impedance and (can reach 10 ⁹Ω) and high-gain.Adopt the both-end input mode, can suppress to scurry into the power frequency in the transmission cable effectively, static, common mode interference such as electromagnetic coupled.Because influencing measuring accuracy, input impedance height, the impedance of transmission line almost can ignore.And the both-end input can be become single-ended output, to adapt to the needs of load.The independent backguy of power supply of sensor [1] not with the amplifier common power source, is adopted the suspended power supply energisation mode, cooperates difference amplification low pass circuit [2], and common mode inhibition capacity is improved.A4, A5 are the quadravalence chebyshev low-pass filter, and D is a stabilivolt, play and disturb and the protection device effect that is not damaged.

A/D change-over circuit [3] adopts 8 tunnel inputs of AD0809 type to approach mode one by one, has 8 analog quantity input ends, if input end is not enough, available I/O parallel port is expanded input end by two-stage decode device and multi-way switch.Each input terminal voltage is 0-5V, but timesharing change, switching time is relevant with frequency, representative value is 100 μ S.

Computing machine extension set [4] adopts 8031 single-chip microcomputers, reads the transformation result of A/D change-over circuit [3], and these digital quantities are carried out medium filtering, processing such as average, management external interrupt INT0, INT1 and timer T0, resources such as internal resource such as T1 and 8255A parallel port.8031 also are responsible for the temperature after the process processing, pressure, the isoparametric data of voltage and current are sent into main control computer [6] by serial interface circuit [5], the serial communication process of 8031 single-chip microcomputers all adopts interrupt mode, the serial communication priority of interrupt is the highest, so that can respond the order that main control computer [6] comes fast.

8031 single-chip microcomputers have the RS-232C serial communication interface of standard, and the worker's serial communication interface of enjoying a double blessing is promptly arranged, and therefore suitably dispose some and drive buffer circuits, just constitute the serial interface circuit [5] of a practicality.

Be configured in a main control computer [6] a plurality of computing machine extension sets of may command [4] in the inspection center, with the master-slave mode co-ordination, it is by serial interface circuit [5] that its main frame and extension set are got in touch, computing machine extension set [4] is subjected to master control to calculate the relatively independent detecting unit of [6] control, finish multiple signals real-time sampling and monitoring are handled, under main control computer [6] control, send the every data of motor that detect to main control computer [6] by serial interface circuit [5], main control computer [6] also can be according to the designing requirement of monitoring and diagnosis, can ask for data from each computing machine extension set [4] at any time, and determine which computing machine extension set [4] to carry out communication with by main control computer [6].

By foregoing circuit technical design and working method explanation, this utility model can realize the measurement to a multinomial parameter of motor, also can realize measurement simultaneously to the multinomial parameter of multiple electric motors, and has a measuring accuracy height, therefore the advantage that antijamming capability is strong can be widely used in all kinds of motor production plants and motor and detect unit.

Claims

A COMPUTER DETECTION electric system it comprise that being arranged on motor detects on-the-spot sensor [1] and be configured in main control computer [6] in the inspection center, it is characterized in that it also comprises difference amplification low pass circuit [2], A/D change-over circuit [3], a plurality of computing machine extension sets [4] and serial interface circuit [5], sensor [1], circuit [2], circuit [3], extension set [4] and circuit [5] link to each other by lead successively and are installed in motor and detect the scene, and circuit [5] links to each other with main control computer [6] by lead.