Influence of the Modeling Depth and Voltage Level on the AC Losses in Parallel Conductors of a Permanent Magnet Synchronous Machine
Influence of the Modeling Depth and Voltage Level on the AC Losses in Parallel Conductors of a Permanent Magnet Synchronous Machine
复制标题
建模深度和电压等级对永磁同步电机并联导体交流损耗的影响
DOI：
10.1109/tasc.2018.2801292
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发表时间：
2018
影响因子：
1.8
通讯作者：
D. Gerling
中科院分区：
文献类型：
--
作者：
F. Birnkammer;Junquan Chen;Daniel Bachinski Pinhal;D. Gerling
交流效应的分析，如集肤效应和邻近效应，以及循环电流和相应的损耗通常是通过有限元分析，而大多数情况下只考虑单个槽，忽略相邻相位对定子铁磁通密度的影响，从而产生槽漏磁通。由于单股有限元（FE）模型的模拟计算要求很高且耗时，本文比较了二维FE模型的不同细节级别，并研究了建模深度对铜损的影响，以找到计算时间优化的建模设置。它示出的情况下，使用单槽模型是足够的分布绕组。此外，交流损耗的潜在增加进行了评估，为两台机器是相同的，除了定子绕组，使同一台机器在两个不同的电压水平，即400和800 V的研究。参考机器是一个160千瓦的标称功率和9000 r/min的最大速度永磁同步电机。由于磁路必须保持恒定，因此两种设计共享相同的总体绕组方案和槽内的股线总数，但并联和串联连接的股线的数量不同。由于较低电压绕组的线束横截面增加，因此更容易受到交流效应的影响，从而倾向于增加绕组损耗。
Analysis of ac effects, such as skin and proximity effect as well as the circulating currents and corresponding losses are usually done by finite-element analysis, while mostly only a single slot is considered, neglecting the influence of neighboring phases on the flux density of the stator iron and thus the resulting slot leakage flux. As the simulation of single stranded finite element (FE) models is computationally very demanding and time consuming, this paper compares different levels of detail of two-dimensional FE models and investigates the impact of the modeling depth on the resulting copper loss to find a computation time optimized modeling setup. It is shown that the use of single slot models is sufficient in case of distributed windings. Moreover, the potential increase of ac losses is assessed for two machines that are identical except for the stator winding, so that one and the same machine is investigated at two different voltage levels, namely 400 and 800 V. The reference machine is a 160 kW nominal power and 9000 r/min maximum speed permanent magnet synchronous machine. Since the magnetic circuit has to remain constant, both designs share the same overall winding scheme and total number of strands within a slot but differ in the number of parallel and serial connected strands. Due to the increased bundle cross section of the lower voltage winding, it is more susceptible to ac effects and thus tends to increased winding losses.