【作者】 王刚；

【导师】 谢德馨；

【作者基本信息】 沈阳工业大学 ， 电机与电器， 2011， 硕士

【摘要】 本课题隶属于国家自然科学基金项目“计算电磁学中电工钢片及其组合结构综合电磁特性的精细模拟”(基金号：50777042),是组成该项目的一部分。变压器杂散损耗的准确计算与叠片铁心和实心钢板中损耗与磁通密度的测量密切相关。尽管目前可以采用具有实际变压器工程背景的标准模型,即TEAM Problem21基准族来进行对比研究,但随着特大容量变压器的研制成功和新材料的使用,需要进一步精细地模拟铁磁材料的宏观特性,特别是模拟实际变压器产品中硅钢片的各向异性,为此需要设计制作新的测试模型。首先,本文设计并制作了TEAM Problem 21的补充模型,其中重点考察了硅钢片的各向异性对杂散损耗的影响,分别制作了三组磁屏蔽用的硅钢叠片,三组硅钢叠片采用同一种材料,只是其长度方向与轧制方向成不同的角度,分别为0°、45°和90°。其次,利用实验仪器精密功率分析仪、数据采集卡、计算机等设备根据实验原理搭建了实验测试平台,实现了对钢板和铜板表面指定位置的磁通密度、损耗的测量,得到了一些对实际产品研发具有参考价值的结果。再次,利用商用有限元分析软件ANSOFT对整个实验模型进行了三维涡流场分析,并将计算结果和实验结果作了对比,二者较为吻合。在此基础上研究了不同电屏蔽结构对杂散损耗的影响,为变压器设计者合理地选取电屏蔽结构提供了参考。最后,利用虚拟仪器和功率放大器研制了一套用于损耗分离实验以及磁化曲线绘制的测量系统,其中包括实验模型的设计、变频电源的研制以及数据采集和处理等,并对用于TEAM Problem 21的补充模型的实心钢板进行了实验,得到了一些具有实际意义的结果。更多还原

【Abstract】 This subject is a part of the National Natural Science Fund Project,’The fine simulation of comprehensive electromagnetic properties of the electrical steel sheet and its composite structures in the computational electromagnetism’(Number:50777042).Accurate Calculation of transformer stray losses is closely related to the losses and flux densities measurements in laminated steel core and solid steel plate. There is a benchmark model, TEAM Workshop Problem 21 family, which is an engineering oriented model for power transformer and can be used for verifying the calculated results. However, with the successful development of large-capacity transformer and the use of new materials, it is necessary to design a new test model for finely simulating the macroscopic properties of ferromagnetic materials, especially the anisotropy of Si-Fe steel sheet in practical transformer products.Firstly, a supplementary model of TEAM Problem 21 is designed and produced, which the influence of anisotropy of Si-Fe sheet on the stray loss is investigated, and three groups of silicon steel laminations for magnetic shielding is made with the same material but different angles of the length direction and the rolling direction at 0°,45°and 90°.Secondly, experimental platform is built by using sophisticated power analyzer, data acquisition card, computer and other equipment. The magnetic flux densities and the losses are measured on the surface of the specified locations of the steel and copper plates, and the results obtained have some consulting value to the practical transformer design.Thirdly, three-dimensional eddy current field of the entire experimental model is analyzed by using commercial finite element analysis software ANSOFT, and the computational and experimental results are agreeable with each other by comparison, and the stray loss with different electrical shielding is analyzed. Based on these, and a reference for reasonable selection of the electrical shielding structure is provided to the transformer designer.Finally, a measurement system is developed by using virtual instruments and power amplifier for losses separating and magnetized curve drawing. The researches including design of the experimental models, development of variable frequency power supply, data acquisition and processing are fulfilled. The measurement system is used to measure the property of the solid plate of the TEAM Problem 21 supplementary model, and some meaningful results are obtained.更多还原