新型带材横向磁通感应加热器设计与相关激励参数优选  

Design and Optimization of Relative Excitation Parameters for a New Strip Transverse Flux Induction Heating Apparatus

作　　者：汪友华[1,2] 吴建成 李宾[1,2] 刘成成[1,2] Wang Youhua;Wu Jiancheng;Li Bin;Liu Chengcheng(State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology,Tianjin 300132,China;Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology,Tianjin 300132,China)

机构地区：[1]省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学),天津300132 [2]河北省电磁场与电器可靠性重点实验室(河北工业大学),天津300132

出　　处：《电工技术学报》2020年第4期745-757,共13页Transactions of China Electrotechnical Society

摘　　要：针对原有横向磁通感应加热装置漏磁稍大且交变磁场通过磁路的磁导率小和磁阻大的不足,设计了新型感应加热器并对新型装置激励参数进行优选。新型装置是在原有装置基础上,在加热器边缘安装与铁心相同材料的铁轭。基于该文提出的磁热耦合计算方法,对原有和新型装置在相同激励下进行涡流场和温度场计算分析。结果表明:新型装置中用于加热带材的交变磁场的有效值较大,在加热状态稳定后,加热器出口处带材表面能够获得更高的温度分布,且新型装置漏磁较小,使得加热器出口处带材表面温度分布均匀性和加热效率均优于原有装置。同时,基于新型装置,针对横向磁通感应加热技术存在带材温度分布不均匀的缺点,计算了不同激励电流大小和频率参数下带材表面的温度分布情况,优选出一组使温度分布均匀性最好的激励参数。结果表明:当电流大小为1000A、频率为500Hz时,带材表面温度分布均匀性最好,其温度相对不均匀度为2.9%。A new transverse flux induction heating device(TFIH)was proposed and designed,and its excitation parameters were optimized since the original TFIH has the disadvantages of high magnetic flux leakage,high magnetic resistance and low magnetic permeability in the magnetic circuit.The new TFIH has two additional yokes in the end of iron core based on the original TFIH.The eddy current and temperature field of both the original and new proposed TFIH devices were obtained under the same excitation condition through the improved magnetic-thermal coupling method.The calculated results show that the effective value of alternating magnetic flux in the proposed TFIH is higher and magnetic flux leakage is lower than that in the original TFIH.Thus,when heating state is stable,a higher temperature rising and a more even temperature distribution on the strip surface at the outlet of the new TFIH can be obtained.The heating efficiency is better than that of the original device.Meanwhile,considering that the proposed TFIH still has the disadvantage of uneven temperature distribution on the strip,the temperature distribution of the strip surface under different magnitude and frequency parameters of excitation current is calculated,and the best magnitude and frequency are obtained.It can be concluded that the uniform temperature distribution on the surface of strip is the best and its temperature relative nonuniformity is only 2.9%,when the magnitude and frequency of excitation current is 1000 A and 500 Hz.

关 键 词：横向磁通感应加热 交变磁场 铁轭 磁热耦合 加热效率 激励参数 

分 类 号：TF761[冶金工程—钢铁冶金]