An Improved Fault-Tolerant Five-Phase Induction Machine Using a Combined Star/Pentagon Single Layer Stator Winding Connection
An Improved Fault-Tolerant Five-Phase Induction Machine Using a Combined Star/Pentagon Single Layer Stator Winding Connection
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DOI：
10.1109/tie.2015.2426672
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发表时间：
2016
影响因子：
7.7
通讯作者：
A. Abdel-Khalik;M. Elgenedy;Shehab Ahmed;A. Massoud
中科院分区：
文献类型：
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作者：
A. Abdel-Khalik;M. Elgenedy;Shehab Ahmed;A. Massoud
多相电机的主要优点之一是具有较高的容错能力。文献表明，在故障条件下，多相感应电机的性能受到定子绕组连接方式的影响。在开环控制的五相电机中，星形连接在正常条件下是有利的，而五边形连接在开相条件下是有利的，并且产生了较低的降额因子。针对五相感应电机，提出了一种结合星形和五边形两种连接方式优点的新型星形/五边形复合单层绕组布局。虽然拟议的绕组本质上是一个不对称的十相机，拟议的连接只允许五相端子。此外，与传统的单层绕组相比，所提出的绕组不仅具有更好的磁通分布，而且完全消除了由于饱和效应和/或不平衡运行而引起的感应三阶电流所引起的三阶谐波磁通分量。因此，减少了机器的损耗，提高了机器的整体效率。对于健康情况，该机器类似于传统的星型连接五相机。然而，与开环和最优电流控制技术的传统连接相比，在一个相位打开时，所提出的连接的降额因子更低。采用1 kw样机进行实验验证。
One of the main merits offered by multiphase machines is their high fault-tolerant capability. Literature has demonstrated that the performance of multiphase induction machines under fault conditions is affected by the employed stator winding connection. In open-loop controlled five-phase machines, the star connection is favorable under healthy conditions while the pentagon connection is favorable and yields a lower derating factor under the open phase condition. In this paper, a new combined star/pentagon single layer winding layout that combines the advantages of both star and pentagon connections is proposed for a five-phase induction machine. Although the proposed winding is intrinsically an asymmetrical ten-phase machine, the proposed connection allows for only five-phase terminals. Moreover, the proposed winding not only yields better flux distribution compared to a conventional single layer winding, but also provides a complete cancellation of the third-order harmonic flux component caused by the induced third sequence currents due to the saturation effect and/or under unbalanced operation. Hence, the machine losses are decreased, which improves the overall machine efficiency. For the healthy case, the machine is similar to a conventional star connected five-phase machine. However, with one phase open, the proposed connection results in a lower derating factor compared to conventional connections for both open-loop and optimal current control techniques. A 1-kW prototype machine is used for experimental verification.