高频高磁密时叠置硅钢片的铁芯损耗计算式改进

Improved Calculation Formula of Core Losses for Laminated Silicon Steels at High Frequency and High Flux Density

已有的铁芯损耗计算式并未考虑高频高磁密时频率和磁密对损耗系数的影响。为解决该问题,提出了一种改进的铁芯损耗计算式。基于几种典型硅钢片的出厂原始数据,以及通过构建的新型3维磁特性测试系统实验所得的宽频铁耗数据,采用改进计算式研究了涡流集肤效应和动态磁滞回线对损耗系数的影响。在此基础上绘制出新的铁芯损耗曲线,并与实测数据进行了比较。结果表明:采用该计算式所得铁耗与实测数据具有很好的一致性,该方法能显著提高计算精度,使最大误差由35%降低到10%以下;同时验证了在高频高磁密时,损耗系数应当随着频率和磁密的变化而变化。

The currently available core losses calculation formulae do not take the impacts of frequency and flux density on the loss coefficients into account at high frequency and high flux density. To solve this problem, we proposed an improved core losses calculation formula. On the basis of the original losses data of several typical laminated silicon steels, in combination with the experimental data of core losses over wide range of excitation frequency carried out by using a novel 3-D magnetic properties testing system, we investigated the influences of eddy current skin effect and the dynamic hysteresis loop on the loss coefficients by employing the improved calculation formula. Then we drew out new curves of core losses, and compared them with the measured data. The results show that the core losses calculated by the proposed formulae have a good consistency with the measured data. The proposed method can improve the computation accuracy obviously, and reduce the maximum error from 35% to 10%. Moreover, it is validated that the loss coefficients should change with frequency and flux density at high frequency and high flux density.