变频调速异步电机场路分析中的动态网格剖分

本文针对变频调速异步电机场路计算中，动态网格剖分的困难性，通过几种常用有限元剖分方法的比较，变形和简化了前推-Delaunay网格剖分算法，根据异步电机的结构特点衍生出了一种可以适用于变频调速电机设计与分析的新的动态网格剖分算法。该算法就是把要剖分的区域划分成几个带状小区域，根据距离最短原则生成网格。并且编程实现了有限元剖分模块。该方法与经典的ANSYS软件剖分进行了比较：有效剖分节点数、单元数，以及所占用的计算机CPU时间、内存，都远远小于ANSYS软件的剖分结果。从而证明了该方法的有效性。     

组合网格法在电磁-机械耦合问题中的应用

将组合网格法应用于电磁-机械耦合问题的分析，用粗网格剖分空气及源电流区，用细网格剖分运动导体区。该方法克服了常规一套有限元网格计算该类问题时需要网格重剖的麻烦。讨论了组合网格法的算法实施具体步骤，粗细网格间采用有限元方法反复迭代计算，粗网格的计算值通过插值矩阵映射到细网格的边界上，之后粗网格的场量通过细网格上计算的余量进行校正。指出由于网格不匹配产生的非协调误差和误差减小方法。在每一时间步，不需重新剖分而只需修改细网格的节点坐标值即可实现导体的运动。计算结果与TEAM标准问题28的实验结果进行比较得到了较好的一致性，验证了算法在处理该类问题时的有效性。     

电机电磁场有限元仿真网格生成方法研究

为了完善上海电器科学研究院电机工业互联网云平台的电机协同设计功能,开发了一款基于有限元法的二维电磁场仿真软件,实现了电机电磁场的仿真计算。在软件前处理的网格生成环节,采用了三角形网格剖分,通过对已有网格算法的总结和研究,提出了一种适用于电机电磁场仿真的二维网格生成方法,具有网格剖分适应性强和计算速度快的特点。介绍的电机电磁场计算的网格剖分方法,已应用于“电机协同设计电磁场有限元仿真软件EMFTest V1.0”的软件开发中,验证了网格生成方法的可行性。     

有限元网格“连环法”计算机剖分

根据有限元网格各相邻单元之间相互依存的关系,提出了“连环法”网格剖分方法。该方法计算公式简单,计算工作量极小,能快速简便地对求解区域进行剖分并产生剖分数据。以二维电机电磁场为例,详述了该方法,并给出了剖分实例。     

有限元网格“连环法”计算机剖分

根据有限元网格各相邻单元之间相互依存的关系，提出了“连环法”网格剖分方法。该方法计算公式简单，计算工作量极小，能快简便对求解区域进行剖分并产生剖分数据。以二维电机电磁场为例，详述了该方法，并给出了剖分实例。     

矿用隔爆兼本质安全型变频调速一体机的研制

介绍了矿用隔爆兼本质安全型变频调速一体机的研制过程,重点电机变频调速原理,电磁设计和结构设计,运用ANSYS有限元进行软件对电磁设计和结构设计进行了分析优化设计,介绍了一体机的优越性。对该电机的性能、创新性及技术经济性进行了分析。     

一种参数化网格剖分方法及其在电机优化设计中的应用

提出了一种适用于电机优化设计的参数化网格剖分方法。该方法将所有剖分节点坐标表示为一组几何参数的线性函数,当电机的几何尺寸变化时不需要网格重新剖分,能显著减少有限元(finite element method,FEM)预处理时间,并通过自适应网格剖分方法和交换对角线技术提高网格单元质量。对电机的参数化网格剖分模型进行FEM计算,利用表面响应法对FEM计算的结果进行处理,构建电机的优化模型,再利用粒子群优化算法寻求优化模型的最优解,得到电机的最优结构参数。将该方法应用于电机优化设计的两个实例,验证了其有效性。     

电机二维磁场有限元分析的前处理

介绍一种电机二维磁场有限元自动网格剖分方法。该方法能适用于电机多媒质和媒质交界线曲折多变的情况,特别是能满足带周期性条件的磁场区域的自动网格剖分要求。磁场区域首先划分成若干子域,子域形状允许是带凹角的曲边多边形。子域网格剖分时,通过设置子域轮廓线上的节点数和节点间距的几何级差,实现任意要求的网格疏密分布。     

电机二维磁场有限元分析的前处理

介绍一种电机二维磁场有限元自动网格剖分方法。该方法能适用于电机多媒体和媒质交界线曲折多变的情况，特别是能满足带周期性条件的磁场区域的电动网格剖分要求，磁场区域首先划分成若干子域，子域形状允许是带凹角的曲边多边形。子域网格剖分时，通过设备子域轮廓线上的节点数和节点间距的几何级差，实现任意要求的网格疏密分布。     

有限元网格自动剖分

提出了一种比较新颖的网格剖分方法 ,它是传统网格初分方法的改进 ,强调初分网格要将子区域划分为凸区域 ,使剖分简单且更可靠。文中还提出网格布点的新方法 ,可实现子区域内及区域边界灵活细分。并用此软件剖分高压电缆终端等结构 ,获得很好的效果     

变频调速异步电机的优化设计

随着变频调速技术的发展，异步电机在工业传动领域中的应用越来越广泛。传统的异步电机设计方法已经不适应变频调速异步电机的设计要求。传统电机的设计重点在于额定点效率、功率因数、最大转矩、起动转矩、起动电流、运行温升和价格等指标。而变频调速电机的设计重点是在调速范围内的效率、功率因数、温升，以及动态响应性能等。本文根据变频调速集成系统的特点，提出具有针对性的变频调速电机优化设计策略。该策略具有以下几个特点：①采用自适应设计模型；②针对变频器供电的谐波影响分析模型；③采用最优滑差控制和面向系统的优化设计方法。利用该优化设计方法，使得变频调速异步电机更加高效节能。     

笼式无刷双馈风力发电机的设计及仿真分析

无刷双馈电机是一种新型的变频调速电机,在风力发电方面有着广阔的应用前景。在传统异步电机设计的基础上提出了笼式无刷双馈电机定、转子结构的设计方法。通过使用MATLAB仿真分析软件,对无刷双馈电机在单馈、双馈状态发电情况下的动、静态特性进行了分析,验证了无刷双馈电机设计参数及仿真模型的正确性。     

一种新型基于Matlab/pdetool的有限元前处理程序开发方法

基于Matlab的混编有限元计算程序，目的就是调用Matlab／pdetool工具箱中几何建模和网格剖分的功能。但考虑到有限元程序的稳定运行以及维护和更新，混编的方法有缺陷。在充分利用Matlab强大的数据处理功能和丰富的功能库函数基础上提出了一种新型不同于混编的有限元前处理程序开发方法。利用MATLAB／Pdetool工具箱库函数的标准格式定义求解域并对区域进行Delaunay三角化剖分，剖分结果以数据文件的形式在有限元前处理程序中被使用，最后采用Visual C＋＋针对一台12／8极永磁式双凸极电机前处理程序的开发实例验证了该方法。     

Performance of a 10-Hp switched reluctance motor and comparisonwith induction motors

A comparison of computed and measured performances of a 10 hp Oulton switched reluctance motor (SRM) and a comparison with the performance of induction motors are presented. The instantaneous current and torque waveforms are computed for the SRM using the results of finite element method (FEM) analysis. The SRM calculated and experimental locked rotor torque, instantaneous current, efficiency, and losses when pulsed voltage excitation is applied to the motor windings were compared. In all cases, there is quite good agreement between the theoretical and experimental results. In addition, the measured total losses, efficiency, and temperature rise for a 10 hp SRM and different induction motors of the same rating are presented. The SRM has a higher efficiency and a lower temperature rise than the induction motors tested     

Unified Calculation Method for Motor Torque in Reluctance Network Analysis

A reluctance network analysis (RNA), which is an improved magnetic circuit method, has some advantages: the analytical model is simple, the calculation accuracy is relatively high, and a coupled analysis with an electric circuit, a heat circuit, a motion equation, and so on, is fundamentally easy. The RNA has been applied to the dynamic analysis of several motors such as a surface permanent magnet (SPM) motor, an interior permanent magnet (IPM) motor, and a switched reluctance (SR) motor. The dynamic characteristics of these motors including starting and a sudden load change can be calculated by an RNA. However, the torque calculation methods for these motors are different from each other. This paper presents a unified calculation method for the motor torque in an RNA, which does not depend on the types and structures of motors. The validity and availability of the proposed method are demonstrated by a finite element method (FEM) and an experiment.     

计及谐波影响异步电机暂态通用仿真算法的研究

建立了基于多回路理论的异步电机通用暂态数学模型,计入了定转子谐波磁场对暂态的作用。可以适用于各种正规和非正规绕组电机的暂态仿真,该数学模型的仿真方法具有很强的通用性。     

Adaptive finite element meshing at each iterative calculation for electromagnetic field analysis of rotating machines

In this paper, we propose a novel algorithm of the nonlinear time‐stepping finite element method for analyses of rotating machines. In the method, the adaptive finite element meshing is applied at each nonlinear and time‐stepping iterative calculation with the interpolate calculations of the potentials from the previous step. The primary finite element mesh at each time step is obtained from the final mesh of the previous time step with minor modification due to the movement of the rotor. The proposed method is applied to the characteristics calculations of a permanent magnet motor and an induction motor to verify the method's validity and its usefulness. It is clarified that the proposed method gives almost identical results to the conventional adaptive meshing method whereas the calculation time is reduced to less than 1/10 in most cases. As a result, the proposed method can reduce not only the time of making mesh manually but also the calculation time compared with the usual finite element method without adaptive meshing. © 2008 Wiley Periodicals, Inc. Electr Eng Jpn, 164(3): 78–91, 2008; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20308     

基于Maxwell2D三相异步电动机有限元仿真方法

通过分析三相异步电动机的工作原理,提出了基于有限元分析软件Maxwell2D对三相异步电动机的仿真建模方法。同时,对三相异步电动机的负载特性进行仿真。通过仿真结果和试验结果的对比,验证了该方法的可行性和可靠性,为今后开发新型电机打下了坚实的基础。     

Prediction of acoustic noise from variable-speed induction motors: deterministic versus statistical approaches

The traditional approach for the prediction of noise radiated from induction motors is usually based on a deterministic approach in which the motor is modeled using finite-element and/or boundary-element methods (FEM/BEM). A great deal of structural details has to be modeled using the deterministic approach. While these deterministic methods have been shown to provide reasonable estimates of the radiated acoustic noise at low frequencies (usually, well below 2 kHz) and for small motors, the demands on computing memory and time render calculations at high frequencies and for large motors almost impossible to make. In this paper, a statistical method especially suited for calculations at high frequencies is introduced. The statistical approach does not require the same amount of details to be modeled as in the FEM/BEM because only the averaged noise within a given frequency band is sought. Furthermore, it utilizes the analytical results obtained from simple structural elements that make up the motor structure. Results demonstrate the feasibility of the method, its ability to discern the contribution of various components of a motor to the overall radiated noise, and substantial savings in the computational effort compared with FEM/BEM.     

Selection of the pole number of induction machines for variablespeed applications

The selection of the pole number for induction motors supplied from a constant frequency source is straightforward because the pole number is determined solely by the synchronous speed required for the application. However, the selection of the pole number for inverter-driven induction motors is much more involved because the pole number is not determined by a single, dominating factor in these cases. In principle, any even number can be chosen as the pole number because the frequency can be adjusted and therefore the synchronous speed can be controlled to have any desired value. For these applications, the selection of the pole number typically involves numerous factors and trade-offs, many of which are identified and their influence on parameters and performance described in this paper. Some general conclusions on the selection of pole number are also presented