SMC Development Guidelines for Axial Flux PM Machines Employing Coreless Rotor Structure for Enhancing Efficiency Based on Experimental Results
SMC Development Guidelines for Axial Flux PM Machines Employing Coreless Rotor Structure for Enhancing Efficiency Based on Experimental Results
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DOI：
10.1109/tia.2022.3154336
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发表时间：
2022-05
影响因子：
4.4
通讯作者：
R. Tsunata;M. Takemoto;S. Ogasawara;Tatsuya Saito;T. Ueno
中科院分区：
文献类型：
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作者：
R. Tsunata;M. Takemoto;S. Ogasawara;Tatsuya Saito;T. Ueno
近年来，为了在保持高效率的同时最大限度地减小系统尺寸，对扁平电机的需求不断增长。一般来说，轴向磁通机 (AFM) 比径向磁通机 (RFM) 更适合扁平形式。 AFM通常采用软磁复合材料（SMC）作为定子铁芯，通过采用低铁损的SMC可以提高其效率。然而，这会降低平均扭矩，因为 SMC 中的铁损和磁导率之间通常存在权衡关系。因此，本文提出了一种具有无芯转子结构的AFM，其中扭矩性能不易受到SMC磁导率的影响。本文旨在揭示 AFM 高效率的理想 SMC 特性。首先，使用许多具有不同铁损和磁导率的虚拟 SMC 材料进行 AFM 模拟，以研究对材料特性的敏感性。虚拟 SMC 的模拟考虑了铁损的实验增加。因此，根据实验结果构建了开发 SMC 的指南。最后，展示了采用按照指南开发的新型 SMC 的 AFM 原型，结果发现它们在所有操作区域都比传统 AFM 提供更高的效率。特别是，一款原型机在实验中在6000 r/min、0.8 Nm下实现了超过96%的极高效率。
In recent years, there has been growing demand for flat electrical machines in order to minimize system size while also maintaining high efficiency. In general, axial flux machines (AFMs) are more suitable for flat form than radial flux machines (RFMs). AFMs usually employ a soft magnetic composite (SMC) for the stator core, and their efficiency can be improved by employing an SMC that has low iron loss. However, this reduces the average torque because there is generally a tradeoff relationship between iron loss and magnetic permeability in SMCs. This article, therefore, proposes an AFM with a coreless rotor structure in which the torque performance is not easily affected by the permeability of the SMC. This article aims to reveal the ideal SMC characteristics for high efficiency in AFMs. First, many virtual SMC materials with different iron loss and permeability are used for simulations of AFMs in order to investigate sensitivity to material properties. The simulations by virtual SMCs take into account the experimental increase in the iron loss. As a result, guidelines for developing SMCs are constructed based on the experimental results. Finally, prototype AFMs employing new SMCs developed by following the guidelines are shown, and it is found that they offer higher efficiency in all operating area than conventional AFMs. In particular, one prototype achieves an extremely high efficiency of over 96% at 6000 r/min, 0.8 Nm in experiments.