This paper presents structure , operation , performance of various variable apeed drives for in - use wire - rope driven belt conveyors , as well as application of explosion - proof variable frequency variable speed device on wire - rope driven belt conveyor in coal mine 摘要分析比较了在用的钢绳牵引带式输送机调速驱动机构的结构组成、工作原理、性能，介绍了防爆变频调速装置在煤矿井下钢绳牵引带式输送机上的使用情况、优点等。
Sanfeng electrical equipment co . , ltd . is a professional manufacturer which products hf , solid hf , intermediate frequency , supersound frequency induction heating equipment , intermediate frequency overall anneal equipment and the installation of all - digital dc governor 经营高频焊管全套设备及其配件保定市三丰电器有限公司是专业生产高频固态高频中频超音频感应加热设备中频整体退火设备和全数字直流调速装置的专业厂家。
With the price ' s decreace of electric and electrical component , and the greatly technic advancement , its performance has been increasingly manifesting superiority when used in electromotor ' s speed regulation . today , there are many models of all digital dc speed regulation devices in the world . the all digital driver represented by mnetorii bings leap of quality of dc speed regulation system 目前，国际上出现了各种型号的全数字直流调速装置，以mentorii为代表的全数字驱动器给直流调速系统的发展带来了质的飞跃。本文从双闭环直流调速原理入手，研究了英国ct公司的直流驱动器mnetorii ，对它的部分软、硬件进行了解析。
Yvf2 series frequency - variable and speed - regulative three - phase asynchronous motors are suitable for running in frequency changer and speed regulation system which the power is supplied by a frequency converter . this new series of product designed unitedly in the country can be mated with all kinds of spwm frequency changer and speed regulation devices and is equipped with a separate cooling fan which ensure the motor for good cooling at various rotating speed 系列变频调速三相异步电动机是适用于由变频器供电的变频调速系统中运行的专用异步电动机，是全国统一设计新的专用系列产品，可与国内、外各种spwm变频调速装置配套，装有独立的冷却风机，能保证电机在不同转速下有良好的冷却效果。
Win2000 bed lift is of personalized design , ultra - stable operation , to offer quietness and comfortableness to the greatest extent to patients with warm colors . it is provided with variable voltage variable frequency device , to produce the best operating curve in accordance with the physiological requirements of human body , to show make the safe , comfort , stable and excellent perfomance in the whole process during the operation of the lift from start , acceleration , deceleration to stop . optional cut - off emergency leveling device may be equiooed at the demand of user to ensure that the passengers inside the lift can be rescued in case of power cut - off accident Win2000系列病床电梯以人性化的设计，超平稳的运行，给予病患者最大程度的安静舒适增添温馨的色彩。采用先进vvvf调频调压调速装置，按人体生理要求由电梯优化产生最佳的运行曲线，使电梯的起动加速减速停止过程处处体现安全舒适平稳的卓越性能。根据用户要求可选装停电应急平稳装置，确保以外停电时，被困电梯内的乘客能及时获得解困。
The degree of consistency change of sprinkler head and the o 8mm depression drip pipe with the change of pressure has been tested . the main conclusion of this study has been produced as follows : ( 1 ) the theory will be correct and notable benefit will be obtained through the utilization of the frequency changer in tube - well irrigation , spray irrigation and drip irrigation . ( 2 ) some energy saving effect of the frequency changer utilization in tube - well irrigation , spray irrigation and drip irrigation will be produced , 37 本项目的研究内容主要包括变频调速装置在管灌、微喷以及大棚滴灌中的节能效果、变频调速装置对微喷和大棚滴灌均匀度的影响以及变频调速装置在管灌中进行“恒量变压”变频运行试验等，同时，对微喷头与中smm低压插入式滴灌带的灌溉均匀度随压力变化情况进行一r试验研究。
The proposition of the scheme for the electric power : according to the request , we imagine pull scheme have : generator - transfer and is fitted rapidly by direct current - direct current machine - target car ; generator - exchange and is adjusted and fitted rapidly - exchange the electrical machinery - the target car 电力拖动方案的提出及确定：根据陆军指挥学院元氏分院提出的要求，设想的拖动方案有：发电机-直流调速装置-直流电机-靶车；发电机-交流调速装置-交流电机-靶车。
Based on some problems about random draft , energy conservation and ensemble efficiency of hydraulic - projects utilization , by the way of full - scale test , the application of frequency changer in agricultural water saving have been studied . it is the first time in china for the imagination that frequency changer has been used in tube - well irrigation in order to make the water pump keep constant transformation 本项目针对目前农业节水灌溉工程中存在的随机取水、节能问题和水利工程资源的综合利用效率提高问题，以实地工程应用试验为基础，对变频调速装置在农业节水灌溉工程中的应用进行了研究。
Mine electrical : integrated automation intelligent switch controller ; mine explosion - proof type intelligent combine switch ; mine power center ; mine vvvf devices ; automation system : mine hoist automation system ; coal preparation plant automation system ; drilling machine control system ; lines of motor vehicles and power leakage protection devices , etc 矿用电器：综合自动化智能开关控制器;矿用隔爆智能组合开关;矿用动力中心;矿用变频调速装置等;自动化系统：矿井提升机自动化系统;选煤厂自动化系统;钻井机自动控制系统;架线电机车电源及其漏电保护装置等。
The dissertation is outlined below . firstly the construction of man b & w marine engine control system is briefly introduced . specifically , construction & logical relationship of the b & w pneumatic control equipment and hardware construction & the speed - regulating principle of dgs - 8800 - the digital governor device are analyzed 本文的主要组织框架为：首先大概介绍了manb & w主机控制系统结构，具体分析了阻w气动控制装置结构组成和逻辑关系以及dgs 8800电子调速装置硬件结构组成和调速原理。
