双闭环逻辑无环流可逆调速系统设计.doc

PAGE PAGE 20 PAGE 1 烟 台 南 山 学 院 毕 业 论 文 题目 双闭环逻辑无环流可逆调速系统设计 姓 名：___ 刘 健 _ 所在学院：_计算机与电气工程学院_ 所学专业：___ 自 动 化 _ 班 级 __ 08级自动化一班 _ 学 号 ___ 200807009683 指导教师：____ 庄 荣 富_ _ 完成时间：____2012年4月15日 摘 要 随着科学技术的不断发展，人们开始了很多方面的探索。对于自动控制系统方面，在工业，农业，交通运输和国防上，广泛应用电动机来拖动工作机械。较为先进的工作机械和生产工艺，普遍要求对生产机械的可靠性有严格要求。故本设计主要介绍了双闭环逻辑无环流可逆调速系统，并通过与带电流截止负反馈有环流可逆调速系统优缺点比较，更进一步验证了前者的优越性以及可靠性。 采用转速负反馈和PI调节器的单闭环直流调速系统可以在保证系统稳定的前提下实现转速无静差。但是，如果对系统的动态性能要求较高，例如：要求快速起制动，突加负载动态速降小等等，单闭环系统就难以满足需要。 本设计介绍了双闭环调速系统的原理，转速环和电流环的作用，并与电流截止负反馈进行了比较。介绍了逻辑无环流调速系统的原理，对其控制器的要求，以及它比有环流调速系统的优越性。从而更进一步的论证了本设计的可行性。 关键字：转速环、电流环、无环流、回馈制动 Abstract With the continuous development of science and technology, people began to explore many aspects. For automatic control systems in industry, agriculture, transportation and defense, the widely used motor to drag the working machinery. More advanced machine tools and production processes, generally require the reliability of production machinery, there are strict requirements. Therefore, this design introduces double-loop speed control system logic without circulation and with the current cut-off by the negative feedback with a reversible speed circulation system advantages and disadvantages compared to further validate the superiority of the former, and reliability. The use of negative feedback and PI speed regulator of the single closed-loop DC drive system can guarantee the stability of the system to achieve speed without static error. However, if the system dynamic performance requirements, such as: demand for quick starting and braking, sudden load dynamic downhill so small, single-loop system would be difficult to meet their needs. This design introduces the principle of double closed loop speed control system, speed loop and current loop,with the current cut-off negative feedback were compared. Describes the logic of the principle of free circulation speed control system, its controller requirements, and its