外文翻译基于PLC异步电动机运行监控系统设计与实施论文Word格式.docx

1、）Design and Implementation of PLC-Based Monitoring Control System for Induction Motor ZHU Shao-ying，XU Yu，He Zheng-wen Xi an Jiaotong University，Xi an 710049，P.R.ChinaAbstract：The implementation of a monitoring and control system for the induction motor based on programmable logic controller （PLC） t

2、echnology is described. Also, the implementation of the 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 the system during normal operation and under trip conditions. Tests o

3、f the induction motor system driven by inverter and controlled by PLC prove a speed regulation as compared to a conventional control system. The efficiency of PLC control is increased at industrial control of electric drives.Keywords：Computer-controlled systems, computerized monitoring, electric dri

4、ves, induction motors, motion control, programmable logic controllers （PLCs）, variable-frequency drives, voltage control.I. INTRODUCTIONSince technology for motion control of electric drives became available, the use of programmable logic controllers （PLCs） with power electronics in electric machine

5、s applications introduced in the manufacturing automation 1, 2. This use offers advantages 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 cos

6、t and to increase quality and reliability 49. Other applications include machine tools 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

7、computers, and other electric equipment 1113. Nevertheless, this 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 motorgenerator

8、 set using a PLC to change the armature voltage 16, and the incorporation 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 m

9、otors in a five-axis rotor position, direction and speed, 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 a

10、nd speed uses a PLC to implement the digital logic coupled 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 dist

11、urbances that disrupt production of an electric plant, two PLCs were used to determine the sensitivity of the equipment 21. II. PLC AS SYSTEM CONTROLLERA PLC is a microprocessor-based control system, designed for automation processes in industrial environments. It uses a programmable memory for the

12、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 and, therefore, incorporates a number of IO points, which allow electr

13、ical 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. III. CONTROL SYSTEM OF INDUCTION MOTORIn Fig. 2, the block diagram of the experimental system is il

14、lustrated. The following configurations can be obtained from this setup.a） A closed-loop control system for constant speed operation, configured with speed feedback and load current feedback. The induction motor drives a variable load, is fed by an inverter, and the PLC controls the inverter Vf outp

15、ut.b） An open-loop control system for variable speed operation. The induction motor drives a variable load and is fed by an inverter in constant Vf control mode. c） The standard variable speed operation. The induction motor drives a variable load and is fed by a constant voltage-constant frequency s

16、tandard three-phase supplyThe open-loop configuration b） can be obtained from the closed-loop configuration a） by removing the speed and load feedback. On the other c） results if the entire control system is bypassed. IV. HARDWARE DESCRIPTIONThe control system is implemented and tested for a wound rotor induction motor, in Table I. The induction motor drives a dc g