调速

Applications of 616G5frequency con version adjustment and programmabl e control technology in clamshell crane are introduced.

介绍了安川616G5变频调速技术和可编程控制技术在抓斗吊上的应用。

This waterwheel steelyard clepsydra device Fig 1 was built by Dr .

古中国擒纵调速器的基本型式是「水轮秤漏装置」。

Researches show that the drive force characteristics of the electric tractor drive system based on series DC motor is close the ideal characteristics, the curves are concave, low speed with constant power, and high speed with constant torque; the electric tractor has large working speed under different shifts, but the extensive coincidence speed shows that the variable ratio of the gear is unreasonable; the maximum climbable gradient of this electric tractor is more than 30%, and does not need frequent shift when working for its extensive climbable gradient; there are many influence factors of continuous working time, which the more obvious factors are working speed and working load, the working time increases with the increase of the working speed and working load.2. Simulation researches on the drive characteristic of the electric tractor.

研究结果表明：基于串励直流电动机(来源：ABC21论文网www.abclunwen.com)的电动拖拉机电驱动系统的驱动力特性场接近理想驱动力特性场，其各挡下的驱动力特性是一组下凹的曲线，低速恒转矩，高速恒功率；同一行驶速度下所对应高挡驱动力大于低挡驱动力，这是由电机的调速特性决定的；电动拖拉机各个挡位下具有较广的稳定作业速度范围，但是各个挡位之间速度重合的范围较多，说明所用变速箱变速比与电动机匹配不合理；电动拖拉机最大爬坡度达到30%以上，并且各挡爬坡度变化范围较广，作业过程中不需要频繁换挡；影响电动拖拉机连续作业时间的因素较多，其中作业行驶速度和作业负荷影响最为明显，作业负荷越大，连续作业时间就越短，作业速度越快，连续作业时间就越短。2、电动拖拉机驱动特性仿真研究。

This course is designed thyristor double closed loop dc speed control system design.

本次课程设计主要研究的是双闭环直流晶闸管调速系统设计。

Servo system is a closed relation to and evidence difference to the common regulation speed system.

伺服系统是一种与普通电动机调速系统有着紧密联系但又明显不同的系统。

Its power circuits are made of three-phase commutator, intelligent power module and power supply module.

首先，本文开发了一套基于TMS320F240的小功率PWM变频调速控制装置。

Because DC motor has commutator, it is limited to use. People took into account VC motor.

由于有换向器的存在，使直流电机的使用受到很大限制，于是人们开始转向异步电机，但异步电机的调速性能难以满足生产的要求。

After studying the altering direction and amplitude modulation mechanism of this type of reversible vibratory plate compactor,this paper discusses the principle of altering direction ,modulating amplitude and adjusting speed.

研究了平板夯换向调幅机构的结构，在力学分析的基础上，阐述了这一机构调幅、调速和换向机理。

The high-voltage high-power multilevel converter and AC motors drive techniques are summarized compendiously for domestic and overseas studies in the prolegomenon of this dissertation. The evolution and research status of multilevel converter topologies are analyzed, the development of AC variable speed techniques and the characteristic of DTC are discussed, also, the aim and significance for the research are demonstrated. In this dissertation, SVPWM pattern and implement method have been addressed comprehensively for three-level NPC inverter.

本文绪论部分针对国内外高压大容量多电平变换技术和交流传动控制技术作了简要综述，着重分析了多电平拓扑结构的发展和研究现状，讨论了交流调速的发展和直接转矩控制技术的特点，指出本文选题的目的和意义。

This paper discusses the mechanisms and implementation details of concatenation control in a three - phase asynchronous motor with double closed loop.

本文所讨论的是双闭环三相异步电动机的串级调速的基本原理与实现方法。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。