多截面场路耦合法和解析法对比分析水轮机定子线棒4种换位下的环流

Comparison of multi-section method coupled field-circuit and analytical method for the analysis of the circulating current of 4 kinds of transposition in the stator of a hydraulic turbine

针对定子线棒三维建模和求解的耗时性以及磁场求解的复杂性,在满足计算精度同时避免庞大的计算量的情况下,分别采用解析法和多截面场路耦合法分析了0°/360°/0°全换位、不足换位、空换位以及延长换位等4种换位,计算了定子各根股线的感应电动势、环流和损耗,给出了两种方法求得的感应电动势对比图、环流对比图和损耗对比图。计算结果表明:全换位的环流抑制效果最差;多截面场路耦合法与解析法计算结果相差很小,同时多截面场路耦合法在正确模拟漏磁场的基础上具有计算公式简单、过程清晰、计算量小、精确度较高等优点。

Aiming at time-consuming 3D modeling and calculation of stator coils as well as the complexity of magnetic field computation, analytical method and muhi-section method coupled field-circuit were proposed to analyze circulating current and loss of stator strands including 0°/360°/0° transposition, inadequate transposition, void transposition and extended transposition on the basis of meeting the computing accuracy and avoiding the large amount of calculation. The comparison chart of the induced voltage, the circulating current and the loss were presented. The results indicate that 0°/360°/0° transposition gets the worst effect in reducing the circulating current compared to other transpositions. And the calculation results are similar between multi-section method coupled field-circuit and analytical method. Moreover, muhisection method coupled field-circuit has advantages in calculation formula, process, amount of calculation and accuracy on the basis of corrrect simulation of leakage magnetic field.