智能变频控制技术的研究与设计.doc

毕业设计 智能变频控制技术的研究与设计 智能变频控制技术的研究与设计 摘　　要 随着现在电力电子技术、交流变频调速技术的飞速发展和现代控制理论，告诉微处理器的普及应用，变频调速技术以其良好的调速能力及节能特性越来越多的应用于工程实际。对于电动执行机构，采用变频调速可以省去复杂的机械齿轮组设计，实现电机的软启动和软停机。 本文首先电动执行机构国内外的研究现状和发展趋势，电动执行器只有以低速运行通过极强的微调作用才能修正微小偏差缺点，提出智能型电动执行器与各种阀体配合，利用数字化变频技术、单片机技术、微电子技术，开发了集执行机构、驱动单元、调节控制单元等为一体的智能电动执行机构。 智能控制电路从结构上主要分为控制部分、执行驱动部分及信号检测部分。控制部分主要单片机、变频调速模块、智能功率模块、整流模块、开关量输入输出通道、故障检测电路等组成；执行驱动部分主要包括执行电机和机械传动部分；检测部分包括电压、电流、温度检测。采用直接转矩控制算法控制变频器，并在线组态，实现对执行器电机的调速控制，实现了电机柔性启动和平稳运行，避免系统对阀门的冲击。 关键词：智能电动执行器；变频控制；单片机 Research and Design of intelligent frequency conversion control technology Abstract With power electronics technology, the rapid development of AC variable speed technology and modern control theory to tell more and more used in engineering with its good speed capacity and energy-saving features of the universal application of the microprocessor, frequency conversion technologypractical. Frequency control eliminates the need for complex mechanical gear set design for the electric actuator motor soft start and soft stop. The first electric actuator in the status quo and development trend of domestic and foreign research a lot of analysis performed for the electric actuator only drawback to running at low speed, strong fine-tune the role to correct minor deviations proposed intelligent electricwith the valve body with using digital inverter technology, single-chip technology, micro-electronics technology, developed a set of implementing agencies, the drive unit, adjust the control unit and other for the integration of intelligent electric actuators. Intelligent control circuit structure is divided into the control part of the implementation of drive parts and signal detection part. Control part of the main microcontroller, frequency control modules, intelligent power module, rectifier module, switch input and output channels, fault detection circuit; execution driven mainly include the implementation of the motor and mechanical drive components; detection part including voltage,