直流电动机无级调速.doc

摘 要 本设计主要是运用调速系统对直流电动机进行调速，使其实现无级的效果。此调速系统由主电路和控制电路两部分组成：主电路是采用晶闸管可控整流装置进行调速;控制电路是采用双闭环速度电流调节方法进行反馈。系统采用调压调速的调速方法可以获得与电动机固有机械特性相互平行的人为机械特性，调速方向是基速以下，只要输出的电压是连续可调的，即可实现电动机的无级调速。双闭环速度电流调节这种方法虽然初次头次成本相对而言较高，但它保证了系统的性能，保证了对生产工艺要求的满足，它既兼顾了启动时的电流的动态过程，又保证稳态后速度的稳定性，在起动过程的主要阶段，只有电流负反馈，没有转速负反馈。达到稳态后，只要转速负反馈，不让电流负反馈发挥主要作用很好地满足了生产需要。本设计的重点也就是对ASR和ACR的设计。 关键词：无级调速；双闭环；ASR；ACR；晶闸管  Abstract This design is the use of speed control system for DC motor speed control to achieve the effect of class. This speed control system from the main circuit and control circuit composed of two parts: the main circuit is controlled rectifier thyristor speed control device; control circuit in a dual method of closed-loop speed feedback current regulator.System speed regulator with the motor speed control methods available to parallel the inherent mechanical properties of artificial mechanical properties, speed is below the base speed, as long as the output voltage is continuously adjustable, and can achieve the level of non-motor transfer speed. Two-speed closed-loop current regulation this way the first time although the initial cost is relatively high, but it ensures that the performance of the system to ensure that the production process to meet requirements, take into account not only the start of the current dynamic process, while ensuring that the stability of steady-state velocity in the main phase of starting the process, only the current negative feedback, no negative feedback speed. After reaching steady state, as long as the speed of negative feedback, negative feedback from the current good to play a major role to meet the production needs. The focus of this design is also the design of ASR and ACR. Key words: stepless speed regulation；double-loop； ASR；ACR；SCR目录 第1章 绪 论 1 1.1问题提出的意义 1 1.2国产直流电机简介 1 1.3直流电动机的发展现状及趋势 2 2章 直流电动机的概述 4 2.1直流电动机的基本知识 4 2.1.1直流电动机的基本结构 4 2.1.2直流电动机的工作原理 5 2.1.3直流电动机的组成及分类 6 2.2直流电动机运行原理 8 2.2.1直流电动机的励磁方式 8 2.2.2直流电动机的基本方程 9 2.2.3直流电动机的机械特性 10 3章 设计任务与要求