Interaction of induction machines fundamental wave design and asymmetries in the transient electrical behavior caused by saturation

T. Wolbank, J. Machl, R. Wohrnschimmel, H. Hauser
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引用次数: 13

Abstract

In today's AC machine drives the control is realized by considering the fundamental wave behavior of the machine only. However, the exploitation of the high frequency or transient properties of the machine can advantageously be used to obtain additional information on the state variables of the machine like flux or rotor position or detection of possible fault conditions. Especially for the estimation of the flux or rotor position in induction machines the practical performance of the resulting control is strongly influenced by the lamination design. Modern design tools for induction machines only consider the fundamental wave and only few effort has been made until now to investigate the interaction of the fundamental wave design and the transient electrical behavior. This work is focused on these interactions. A transient simulation of the machine based on a magnetic equivalent circuit model including lamination material hysteresis is applied to ascertain the connection between saturated areas in the lamination material and the signals obtained from the evaluation of the machines transient electrical step response. To verify this connection as well as to quantify the influence measurements were performed on different machines with specific lamination design each concentrated on dominant saturation in a different area like tooth or yoke in the stator as well as in the rotor. A comparison of the simulation and measurement results of the machines at varying flux and load levels is given and the reasons for the difference in the transient signals is discussed taking the fundamental wave as well as the transient field distribution into account. Based on these results a model of the interaction of fundamental wave saturation and the transient control signals is established where the asymmetries caused by saturation at the different areas of the lamination are each represented by individual phasors. Adding up the phasors of all areas leads to the resulting asymmetry of the machine and gives its dependence on the point of operation.
感应电机基波设计与饱和引起的暂态电行为不对称的相互作用
在今天的交流电机驱动中,控制仅通过考虑电机的基本波行为来实现。然而,利用机器的高频或瞬态特性可以有利地用于获取机器状态变量的附加信息,如磁链或转子位置或检测可能的故障条件。特别是对于感应电机磁链或转子位置的估计,其结果控制的实际性能受到层压设计的强烈影响。现代感应电机的设计工具只考虑基波,迄今为止很少有人研究基波设计与瞬态电学行为的相互作用。这项工作的重点是这些相互作用。利用含磁滞回的磁等效电路模型对机器进行了暂态仿真,确定了层合材料中饱和区域与机器暂态电阶跃响应评估信号之间的关系。为了验证这种联系并量化影响,在不同的机器上进行了测量,这些机器具有特定的层压设计,每个都集中在定子和转子的齿或轭等不同区域的主导饱和。给出了不同磁通和负载水平下的仿真结果与实测结果的比较,并在考虑基波和暂态场分布的情况下,讨论了暂态信号差异的原因。基于这些结果,建立了基波饱和与瞬态控制信号相互作用的模型,其中由层合不同区域的饱和引起的不对称分别由单个相量表示。将所有区域的相量相加会导致机器的不对称,并使其依赖于操作点。
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