优先发表 | 三篇关于电机本体性能分析的文章

文摘   科学   2024-06-10 07:00   北京  


1

Winding function model-based performance evaluation of a PM transverse flux generator for applications in direct-drive systems

基于绕组函数模型的永磁横向磁通发电机在直接驱动系统中的性能评价

Mehrage Ghods; Jawad Faiz; Ali A. Pourmoosa

M. Ghods, J. Faiz and A. A. Pourmoosa, "Winding function model-based performance evaluation of a PM transverse flux generator for applications in direct-drive systems," in CES Transactions on Electrical Machines and Systems, doi: 10.30941/CESTEMS.2024.00013.

Abstract—The magnetic flux in a permanent magnet transverse flux generator (PMTFG) is three-dimensional (3D), therefore, its efficacy is evaluated using 3D magnetic field analysis. Although the 3D finite-element method (FEM) is highly accurate and reliable for machine simulation, it requires a long computation time, which is crucial when it is to be used in an iterative optimization process. Therefore, an alternative to 3D- FEM is required as a rapid and accurate analytical technique. This paper presents an analytical model for PMTFG analysis using winding function method. To obtain the air gap MMF distribution, the excitation magneto-motive force (MMF) and the turn function are determined based on certain assumptions. The magnetizing inductance, flux density, and back-electro-magnetomotive force of the winding are then determined. To assess the accuracy of the proposed method, the analytically calculated parameters of the generator are compared to those obtained by a 3D-FEM. The presented method requires significantly shorter computation time than the 3D-FEM with comparable accuracy.


摘要—永磁横向磁通发生器(PMTFG)中的磁通是三维的,因此用三维磁场分析来评价其效能。尽管三维有限元法(FEM)在机器仿真中具有很高的精度和可靠性,但它需要很长的计算时间,这对于迭代优化过程是至关重要的。因此,需要一种替代3D-FEM的快速而准确的分析技术。本文提出了用绕组函数法分析PMTFG的解析模型。为了得到气隙的磁流变分布,在一定的假设条件下确定了磁流变的励磁力和转数函数。然后确定绕组的磁化电感、磁通密度和反电磁动势。为了验证所提方法的准确性,将分析计算得到的发电机参数与三维有限元计算得到的参数进行了比较。与精度相当的3D-FEM相比,该方法所需的计算时间明显缩短。 


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2

Analysis and Research on Mechanical Stress and Multiobjective Optimization of Synchronous Reluctance Motor

同步磁阻电机机械应力分析与多目标优化研究

Han Zhou; Xiuhe Wang; Lixin Xiong; Xin Zhang

H. Zhou, X. Wang, L. Xiong and X. Zhang, "Analysis and research on mechanical stress and multiobjective optimization of synchronous reluctance motor," in CES Transactions on Electrical Machines and Systems, doi: 10.30941/CESTEMS.2024.00015.

Abstract—The mechanical strength of the synchronous reluctance motor (SynRM) has always been a great challenge. This paper presents an analysis method for assessing stress equivalence and magnetic bridge stress interaction, along with a multiobjective optimization approach. Considering the complex flux barrier structure and inevitable stress concentration at the bridge, the finite element model suitable for SynRM is established. Initially, a neural network structure with two inputs, one output, and three layers is established. Continuous functions are constructed to enhance accuracy. Additionally, the equivalent stress can be converted into a contour distribution of a three-dimensional stress graph. The contour line distribution illustrates the matching scheme for magnetic bridge lengths under equivalent stress. Moreover, the paper explores the analysis of magnetic bridge interaction stress. The optimization levels corresponding to the length of each magnetic bridge are defined, and each level is analyzed by the finite element method. The Taguchi method is used to determine the specific gravity of the stress source on each magnetic bridge. Based on this, a multiobjective optimization employing the Multiobjective Particle Swarm Optimization (MOPSO) technique is introduced. By taking the rotor magnetic bridge as the design parameter, ten optimization objectives including air-gap flux density, sinusoidal property, average torque, torque ripple, and mechanical stress are optimized. The relationship between the optimization objectives and the design parameters can be obtained based on the response surface method (RSM) to avoid too many experimental samples. The optimized model is compared with the initial model, and the optimized effect is verified. Finally, the temperature distribution of under rated working conditions is analyzed, providing support for addressing thermal stress as mentioned earlier.


摘要—同步磁阻电机(SYNRM)的机械强度一直是一个很大的挑战。本文提出了一种评估应力等效性和磁桥应力相互作用的分析方法,以及一种多目标优化方法。考虑到桥体处复杂的磁阻结构和不可避免的应力集中,建立了适合SYNRM的有限元模型。初步建立了两输入、一输出、三层的神经网络结构。构造连续函数以提高精度。另外,等效应力可以转化为三维应力图的等值线分布。等值线分布说明了等效应力下磁桥长度的匹配方案。此外,本文还对磁桥相互作用应力的分析进行了探讨。定义了各磁桥长度对应的优化级别,并对各级别进行了有限元分析。采用田口法确定各磁桥上应力源的比重。在此基础上,提出了一种基于多目标粒子群优化(MOPSO)技术的多目标优化方法。以转子磁桥为设计参数,对气隙磁通密度、正弦特性、平均转矩、转矩脉动、机械应力等10个优化目标进行了优化。基于响应面法(RSM)可以得到优化目标与设计参数之间的关系,避免了实验样本过多的问题。将优化后的模型与初始模型进行了比较,验证了优化后的效果。最后,对额定工况下的温度分布进行了分析,为解决热应力问题提供了依据。 


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3

Role of end-ring configuration in shaping IE4 induction motor performance

端环配置对IE4异步电机性能的影响

Tayfun Gundogdu; Sinan Suli

T. Gundogdu and S. Suli, "Role of end-ring configuration in shaping IE4 induction motor performance," in CES Transactions on Electrical Machines and Systems, doi: 10.30941/CESTEMS.2024.00014.

Abstract—The performance characteristics, particularly the starting performance of direct line-fed induction motors, which are mainly influenced by the design of the rotor, are crucial considerations for end-users. It is quite a challenging issue for motor manufacturers to enhance the starting performance of existing mass-produced motors with minimal modifications and expenses. In this paper, a simple and cost-effective method to improve the starting performance of a commercial squirrel-cage induction motor (SCIM) is proposed. The influence of geometric parameters of the end-ring on the performance characteristics, including starting (locked rotor) torque, pull-up and break down torque, starting current, rotor electric parameters, current density, power losses, and efficiency have been comprehensively investigated. It has been revealed that among the other end-ring design parameters, the ring thickness has a significant effect on the performance characteristics. An optimal end-ring thickness is determined, and its performance characteristics have been compared to those of its initial counterpart. Numeric and parametric analyses have been conducted using a 2D time-stepping finite element method (FEM). The FEM results were validated using experimental measurements obtained from an 11 kW SCIM prototype.


摘要—直接馈电异步电动机的性能特性,特别是起动性能,主要受转子设计的影响,是终端用户必须考虑的问题。如何以最小的修改和费用来提高现有大批量生产的电动机的起动性能是电机制造商面临的一个相当具有挑战性的问题。本文提出了一种简单、经济的方法来改善商用鼠笼式异步电动机(SCIM)的起动性能。研究了端环几何参数对起动(堵转)转矩、上拉和分断转矩、起动电流、转子电气参数、电流密度、功率损耗和效率等性能特性的影响。结果表明,在端环设计的其它参数中,端环厚度对端环的性能特性有显著影响。确定了端环的最佳厚度,并与初始端环进行了性能比较。采用二维时步有限元法(FEM)进行了数值分析和参数分析。在一台11千瓦SCIM样机上进行了实验测量,验证了有限元计算的结果。 


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《中国电工技术学会电机与系统学报(英文)》(CES TEMS)是中国电工技术学会和中国科学院电工研究所共同主办、IEEE PELS学会技术支持的英文学术期刊。期刊发表国内外有关高性能电机系统、电机驱动、电力电子、可再生能源系统、电气化交通等研发及应用领域中原创、前沿学术论文。中国工程院院士马伟明担任主编,IEEE的执委Don Tan博士为国际主编。目前已被EI、Scopus、 Inspec、Google scholar、IEEE Xplore、中国科学引文数据库(CSCD) 核心版、DOAJ、CSTPCD、知网、万方、维普等数据库收录。



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