外文翻译--基于PLC的异步电动机运行监控系统的设计与实施

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1、PDF外文：http:/ TRANSACTIONS ON ENERGYCONVERSION, VOL. 19, NO. 3, SEPTEMBER 2004外文翻译（原文）  1 Design and Implementation of PLC-Based Monitoring Control System for Induction Motor Abstract： The implementation of a monitoring and control system for the induction motor based on programmable logic contr

2、oller (PLC) technology is described. Also, the implementation of the hardware and software for speed control and protection with the results obtained from tests on induction motor performance is provided. The PLC correlates the operational parameters to the speed requested by the user and monitors t

3、he system during normal operation and under trip conditions. Tests of the induction motor system driven by inverter and controlled by PLC prove a higher accuracy in speed regulation as compared to a conventional control system. The efficiency of PLC control is increased at high speeds up to 95% of t

4、he synchronous speed. Thus, PLC proves themselves as a very versatile and effective tool in industrial control of electric drives. Keywords： Computer-controlled systems, computerized monitoring, electric drives, induction motors, motion control, programmable logic controllers (PLCs), variable-freque

5、ncy drives, voltage control. I. INTRODUCTION Since technology for motion control of electric drives became available, the use of programmable logic controllers (PLCs) with power electronics in electric machines applications has been introduced in the manufacturing automation 1, 2. This use offers ad

6、vantages such as lower voltage drop when turned on and the ability to control motors and other equipment with a virtually unity power factor 3. Many factories use PLCs in automation processes to diminish production cost and to increase quality and reliability 49. Other applications include machine t

7、ools with improved precision computerized numerical control (CNC) due to the use of PLCs 10. To obtain accurate industrial electric drive systems, it is necessary to use PLCs interfaced with power converters, personal computers, and other electric equipment 外文翻译（原文）  2 1113. Nevertheless, this

8、makes the equipment more sophisticated, complex, and expensive 14, 15. Few papers were published concerning dc machines controlled by PLCs. They report both the implementation of the fuzzy method for speed control of a dc motor/generator set using a PLC to change the armature voltage 16, and the inc

9、orporation of an adaptive controller based on the self-tuning regulator technology into an existing industrial PLC 17. Also, other types of machines were interfaced with PLCs. Thereby, an industrial PLC was used for controlling stepper motors  in a five-axis rotor position, direction and speed,

10、 reducing the number of circuit components, lowering the cost, and enhancing reliability 18. For switched reluctance motors as a possible alternative to adjustable speed ac and dc drives, a single chip logic controller for controlling torque and speed uses a PLC to implement the digital logic couple

11、d with a power controller 19. Other reported application concerns a linear induction motor for passenger elevators with a PLC achieving the control of the drive system and the data acquisition 20. To monitor power quality and identify the disturbances that disrupt production of an electric plant, tw

12、o PLCs were used to determine the sensitivity of the equipment 21.  Only few papers were published in the field of induction motors with PLCs. A power factor controller for a three-phase induction motor utilizes PLC to improve the power factor and to keep its voltage to frequency ratio constant

13、 under the whole control conditions 3. The vector control integrated circuit uses a complex programmable logic device (CPLD) and integer arithmetic for the voltage or current regulation of three-phase pulse-width modulation (PWM) inverters 22. Many applications of induction motors require besides th

14、e motor control functionality, the handling of several specific analog and digital I/O signals, home signals, trip signals, on/off/reverse commands. In such cases, a control unit involving a PLC must be added to the system structure. This paper presents a PLC-based monitoring and control system for

15、a three-phase induction motor. It describes the 外文翻译（原文）  3 design and implementation of the configured hardware and software. The test results obtained on induction motor performance show improved efficiency and increased accuracy in variable-load constant-speed-controlled operation. Thus, the

16、 PLC correlates and controls the operational parameters to the speed set point requested by the user and monitors the induction motor system during normal operation and under trip conditions. II. PLC AS SYSTEM CONTROLLER A PLC is a microprocessor-based control system, designed for automation process

17、es in industrial environments. It uses a programmable memory for the internal storage of user-orientated instructions for implementing specific functions such as arithmetic, counting, logic, sequencing, and timing 23, 24. A PLC can be programmed to sense, activate, and control industrial equipment a

18、nd, therefore, incorporates a number of I/O points, which allow electrical signals to be interfaced. Input devices and output devices of the process are connected to the PLC and the control program is entered into the PLC memory (Fig. 1).   Fig. 1. Control action of a PLC. In our application, it controls through analog and digital inputs and outputs the varying load-constant speed operation of an induction motor. Also, the PLC continuously monitors the inputs and activates the outputs according to the control program. This PLC system is of modular type composed of specific hardware