基于感应加热电流的温度控制模型研究  

Research on Temperature Controlled Models Based on Induction Heating Current

作　　者：惠晶[1] 蔡爱军[1] 沈锦飞[1] 

机构地区：[1]江南大学控制科学与工程研究中心,江苏无锡214122

出　　处：《金属热处理》2006年第2期70-74,共5页Heat Treatment of Metals

基　　金：江苏省"333"工程资助项目(CS20013005)

摘　　要：介绍了基于脉冲密度调制(PDM)的感应加热电源的拓扑结构及其工作原理。根据感应加热的电磁原理,运用数学、物理学方法,研究分析了感应加热过程中各种发热效应的产生原理,推导出被加热工件的温度与感应电流和加热时间之间的数学关系,并建立了温度模型。根据该温度控制模型和对被加热工件的预期加热温度,通过数字信号处理器(DSP)的实时运算,辨识出所需感应电流和加热时间,实现通过对感应加热电源谐振电流的在线调控,达到对工件温度的间接控制。为实现无温度传感器的温度精确控制,简化系统结构,降低装置成本和提高系统可靠性提供了有效的理论依据。An induction heating power hased on Pulse-Density-Modulation （PDM）is introduced,According to the electric-magnetic principle on the induction heating and the applying mathematical and physieal methods,the induction heating effects are analyzed and researched, and the mathematical relationship between the expected heating temperature and the requiring induction current as well as heating duration are deduced in detail. Forthermore, the temperature models are built up based on the models and the expected heating temperature. Both induction current and heating time can timely been identified and calculated by a digital ductive heating system may been regulated signal processor （DSP） on line,so that the output resonant current of the in and controlled accurately in time. It is effective and realistic to precisely control the heating temperature of workpieces without any temperature sensor, at the meanwhile the induction heating system in the structure of the controlling temperature is cheaper, simpler and more reliable.

关 键 词：温度模型 感应加热/电流 温度传感器 脉冲密度调制(PDM) 

分 类 号：TG156.99[金属学及工艺—热处理] TH186[金属学及工艺—金属学]