外文翻译基于SRM的跳汰机自动排料系统.docx

1、外文翻译基于SRM的跳汰机自动排料系统翻译部分英文原文Auto-discharging System for Jigging Machine Based on SRMAbstract-This paper introduces an auto-discharging system for jigging machine based on switched reluctance motor (SRM). In this system, SRM is used to replace the traditional asynchronous motor. The hardware system, c

2、ontroller and software design methods are discussed in this paper. AT89C51 is taken as the core component of the speed regulation controller for SMR and works with other peripheral circuits to realize effective control on motor. The experiment shows that auto-discharging system for jigging machine b

3、ased on SRM is feasible and can play an important role in stabilizing clean coal ash content, reducing clean coal loss, improving product quality and separation efficiency.Keywords：Jigging machine, auto-discharge system; switched reluctance motor1. INTRODUCTIONThe jigging machine is a kind of mechan

4、ical mineral sorting equipment and occupies an important position in the production of the large modem coal preparation plant. However, the automation level of jigging machine has been out-dated. The backward control mode in jigging coal preparation restricts the product quality, separation efficien

5、cy and process ability. One of the reasons is the lower efficiency of the motor which is used commonly in discharging system for jigging machine. How to improve the efficiency of motor has an important significance for improving coal preparation efficiency and stabilizing product quality.Switched re

6、luctance motor (SRM) with better start characteristics is suitable for starting frequently in adverse environmental condition, high temperature and even strongvibration conditions and keeps higher efficiency. Based on these characteristics, we use switched reluctance motor instead of the traditional

7、 asynchronous motor to developauto-discharging system for jigging machine based on SRM. The experiment shows that auto-discharging system for jigging machine based on SRM is feasible and can play an important role in stabilizing clean coal ash content, reducing clean coal loss, improving product qua

8、lity and separation efficiency.II. CONSTITUTION OF SPEED-REGULATION SYSTEM FOR SWITCHED RELUCTANCE MOTORSThe speed-regulation system for switched reluctance motor is composed of SRM, power converter, controller and detector, as shown in Figure 1.Figure. 1 The structure of the SRM speed-regulation sy

9、stem1) Switched reluctance motorSwitched reluctance motor is the key component of SRM speed-regulation system.2) Power converterThe power converter is a circuit device that is used to drive SRM and provide power for SRM. The on and off status of power switch of power converter are controlled reasona

10、bly to complete speed regulating. The cost of power converter accounts for a large proportion in whole SRM speed-regulation system, thus selecting and designing suitable power converter is one of key factors that improve performance-price ratio of SRM speed-regulation system.3) ControllerController

11、is the centrum of system and will play an important role in the system. The function of controller is, according to actual system running status, to deal with external input instruction, speed feedback signal and feedback information of current sensor and position sensor and to control the working s

12、tate of main switch device in power converter, thus, realizing the control of switched reluctance motor running status, satisfYing the running requirements.4) DetectorIn order to enable switched reluctance motor to runnormally, the corresponding phase winding must be conductive when the rotor goes t

13、o certain position and every phase windings should be switched correctly all the time. Otherwise, motor not only can not operate as perrequirement, but also the phenomena such as motor reversion,stop or rotating random may occur. In order to obtain instantaneous position of rotor while motor runs, t

14、he angle displacement sensor must be installed within motor to output correct rotor position information. This is also an obvious difference between switched reluctance motor and other motors.III. USE DESIGN OF CONTROLLER FOR SRM SPEED-REGULATION SYSTEMThe method of combining hardware circuit and si

15、nglechip computer is adopted in the design of controller for SRM speed-regulation system. Hardware circuit takes charge fast regulation task and single-chip computer completes the complex functions such as logic and parameter setting. AT89C51 single-chip computer is used as the core component of con

16、troller, in addition, other control circuits such as position detector, current and voltage detector, overcurrent protection, over voltage protection, analog and digital input, output circuit as well as display circuit and so on. The block diagram of controller for SRM speed-regulation system is sho

17、wn in Figure 2.Figure.2 The hardware structure of the system controllerThe AT89C51 single-chip computer is the key part of controller and its function is comparing the given value of external rotate speed with actual value of motor speed, thencalculating controllable variables (mostly including curr

18、ent chopping basis Ig and motor winding firing angle on ) according to pre-established PID regulating formula, lastly, based on the external operation requirements (rotating clockwise or counter-clockwise) and the wave shape of position sensor to decide phase output signal. Moreover, the single-chip

19、 computer completes also some display functions, for instance, over voltage, low voltage, over loading and system status and so on.(1) Position sensor signal input circuit is the role of the motor position sensor signal waveform input is provided to the microcontroller, and also both isolation prote

20、ction function. Single chip microcomputer according to the circuit provides the waveform can be identified motor rotor position so as to determine the corresponding output signal, can also be based on the sensor waveform cycle to calculate the practical operation of the motor speed values to PID ope

21、rations and other functions.(2) Phase interruption circuit function is when the position sensor waveform changes state generates an interrupt signal to the microprocessor to provide a phase signal output to prepare.(3) Phase locked frequency multiplier circuit is used to position sensor signal cycle

22、 frequency. But the computer from accurate in conduction angle and critical angle corresponding to the output signal is broken.(4) A/D conversion and speed circuit which is to be set by the user simulation speed value through the A/D conversion module conversion to digital quantity input to the comp

23、uter.(5) Over-voltage and under-voltage protection circuit when the role of the power circuit voltage exceeds the specified voltage and control the supply voltage is less than the given value to the computer sends out alarm signals from but make the corresponding treatment and protective measures of

24、 computer.(6) External operation circuit of the main role is to user requirements, such as start, stop, forward, inversion, electric, braking, dynamic and interlock control information input to the computer, as well as with external isolation effect.(7) Reset circuit is mainly divided into: power on

25、 reset, manual reset and automatic reset. When a system failure by divided so that its return to a normal state.(8) Display circuit functions to display the working status of motor speed control system. Mainly a given speed display, the given speed and actual speed synchronization, overload and lock

26、ed-rotor display, over-voltage and under-voltage display, display and power supply display operation.(9) Signal output interface circuit is used to output of the single chip computer corresponding signal output to the external interface circuit so as to interface with MCU isolation effect; steering

27、control circuits function according to users operation requirements to determine the motor running steering: the positive rotation and the reverse rotation.(10) D/A conversion and low speed chopper circuit is when the motor is running below the low speed region, the controlled variables through the

28、D/A converter converts the analog quantity and the winding of the motor to thereby control the actual current value is compared to the motor winding current peak.(11) Current limiting protection circuit when the role of the motor winding current exceeds a rated current value when the output signal s

29、o that all the output signal of the phase in the off state, protects the main circuit of large power transistor and the effect of motor winding.(12) Logic and circuit is the role of the three signal processing logic and then output to the corresponding push circuit is amplified to drive the power ci

30、rcuit, isolation.IV. SOFTWARE DESIGN OF CONTROLLER FOR SRM SPEED-REGULATION SYSTEMThe programming of controller software uses assembly language of A T89C51 single-chip computer. Modularization design is adopted to increase readability and portability. For this system, the control software should mee

31、t following requirements:1) To assure that motor starts without dead zone and possesses large enough start torque to decrease torque pulsating during starting.2) To be capable of realizing motor transition smoothly between two working status, that is, low speed current chopping and high speed angle

32、position.3) To be able to receive and judge external fault signals and protection signals, to diagnose and display faults and take corresponding prevention measures.4) To use modularization method in software programming, to generate relationship as few as possible between subroutines and transmit parameters by variables and flags. The software programming includes main, startup module, running module and phase interrupt module. The flowchart of main program is shown in Figure 3.Figure.3 The hardware structure of the system controllerV. AUTO-DISCHARGING SYSTEM FOR JIGGING MACHINE BA