基于Flotherm的大功率伺服控制驱动器瞬态热分析

Transient thermal analysis of high power servo control driver based on Flotherm

文章介绍了一种估算IGBT耗散功率的方法,以及一种常用的IGBT结温的估算方法,并分析其缺陷。同时利用有限元热仿真软件Flotherm,针对IGBT内部的详细结构,提出了一种合理建模方法,以此计算了伺服控制驱动器在工作过程中瞬态热特性,并与试验数据进行了对比。结果表明,计算结果与试验结果吻合较好,较准确地模拟了伺服控制驱动器在瞬时的大推力工况下的热性能。该仿真计算方法可为今后伺服控制驱动设备的热冲击和热耦合问题的分析和验证提供新的途径。

A method for estimating the dissipative power of IGBT and a common method for estimating the temperature of IGBT junction are introduced,and its defects are analyzed.At the same time,aiming at the detailed structure of IGBT,a reasonable modeling method is presented based on the finite element thermal simulation software Flotherm.The transient thermal characteristics of servo control driver during work are calculated and compared with the experimental data.The results show that the calculated results are in good agreement with the experimental results,and the thermal performance of the servo control driver under the instantaneous large thrust condition is simulated accurately.The simulation method can provide a new way for the analysis and verification of the thermal shock and thermal coupling of the servo control devices in the future.