Analysis of the end-effects in magnetic gears and magnetically geared machines
Analysis of the end-effects in magnetic gears and magnetically geared machines
复制标题
DOI：
10.1109/icelmach.2014.6960211
复制
发表时间：
2014-11
期刊：
影响因子：
--
通讯作者：
S. Gerber;R.-J. Wang
中科院分区：
文献类型：
--
作者：
S. Gerber;R.-J. Wang
磁齿轮和集成磁齿轮传动机械由于其极高的转矩密度而受到广泛关注。在传统电机的设计和分析中，有限元法（FEM）已被广泛用于这类电机。为了提高计算效率，FEM建模的标准做法是通过仅应用二维（2D）建模和利用周期性（如果有的话）来降低问题的复杂性。然而，它已被许多研究人员表明，有一个显着的差异，从二维和三维（3D）有限元法的结果，这些机器。虽然人们普遍认为，这种差异是由于严重的终端效应，一直没有发表的工作，特别是在这些机器中的工作终端效应机制。本文试图找出这些端部效应的起源，并解释为什么它们在磁齿轮和磁齿轮机械中特别重要。采用二维和三维有限元法研究了一些关键设计参数对失速转矩的影响。特别注意2D和3D结果之间的差异，这有助于确定是否或在多大程度上可以利用2D有限元分析这些特殊的机器的设计分析。端部效应对定子负载系数的影响，一个有用的概念，在磁齿轮电机的设计，也进行了研究。
Magnetic gears and integrated magnetically geared machines have recently received much attention due to their exceptionally high torque densities. As in the design and analysis of conventional electrical machines, the finite element method (FEM) has been widely used for this class of electrical machine. For the sake of computational efficiency, the standard practice in FEM modeling is to reduce the problem complexity by applying only two-dimensional (2D) modeling and exploiting periodicity, if any. However, it has been shown by many researchers that there exists a significant discrepancy between the results from two-dimensional and three-dimensional (3D) FEM for these machines. Whilst it is generally believed that this discrepancy is due to severe end-effects, there has been no published work specifically looking into the end-effect mechanisms at work in these machines. This paper attempts to identify the origins of these end-effects and explain why they can be especially significant in magnetic gears and magnetically geared machines. The effect of some critical design parameters on the stall torque is investigated by using both 2D and 3D FEM. Special attention is given to the difference between 2D and 3D results, which helps to establish whether or to what extent 2D FEM can be utilized for the design analysis of these special machines. The impact that end-effects have on the stator load factor, a useful concept in the design of magnetically geared machines, is also investigated.