外文翻譯--基于plc的異步電動機(jī)運(yùn)行監(jiān)控系統(tǒng)的設(shè)計與實施

1、外文翻譯（原文）1Design and Implementation of PLC-Based Monitoring Control System for Induction MotorAbstract：The implementation of a monitoring and control system for the induction motor based on programmable logic controller (

2、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

3、 operational parameters to the speed requested by the user and monitors the system during normal operation and under trip conditions. Tests of the induction motor system driven by inverter and controlled by PLC prove a h

4、igher 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 the synchronous speed. Thus, PLC proves themselves as a very versati

5、le 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), vari

6、able-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 machines

7、applications has been 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

8、 power factor [3]. Many factories use PLCs in automation processes to diminish production cost and to increase quality and reliability [4]–[9]. Other applications include machine tools with improved precision computerize

9、d 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

10、外文翻譯（原文）3design 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-control

11、led operation. Thus, the 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. P

12、LC AS SYSTEM CONTROLLERA PLC is a microprocessor-based control system, designed for automation processes in industrial environments. It uses a programmable memory for the internal storage of user-orientated instructions

13、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 numb

14、er 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

15、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