FIELD WINDING DRAG AND NORMAL FORCES OF LINEAR SYNCHRONOUS HOMOPOLAR MOTORS

ABSTRACT

Drag and normal forces caused by the homopolar field winding in a linear synchronous homopolar motor (LSHM), having a segmented secondary of solid iron, are calculated. The analysis is based on the electromagnetic field theory. Numerical results are computed and some experimental results are also given. It is concluded that solid iron segmented secondary is suitable for high speeds (100 to 120 m/s).     

改进的TABU法在异同步电动机优化中的应用

本文阐述了适用于全局寻优的ＴＡＢＵ随机搜索法的基本原理及其改进措施,并用标准的实验函数对它的可靠性和寻优效率进行了验证。最后对ＴＡＢＵ随机搜索法在大型异同步电动机优化设计中的应用进行了研究。     

永磁直线同步电动机的自适应学习控制

由于没有传动机构,使永磁直线交流同步电机（PMLSM）控制器设计较为复杂.PMLSM对模型不确定性和外扰更加敏感;推力波动等非线性因素对运动精度影响很大.针对上述问题,用自适应学习方法改善PMLSM的轨迹跟踪性能,并对迭代模式和单次运行模式下算法的收敛性进行了证明,通过实验进行了算法验证.该控制方法基于迭代学习,控制器分为两个部分,通过执行重复任务自适应学习项补偿系统的非线性;另一项用于增强系统的鲁棒性,保证系统在单次运动模式下稳定.实验结果表明,这种控制方法可以有效提高PMLSM轨迹跟踪精度.     

ACTIVE DAMPING OF MAGLEV VEHICLES USING SUPERCONDUCTING LINEAR SYNCHRONOUS MOTORS

ABSTRACT

This paper explores the use of linear synchronous motor control to provide active damping for magnetically-levitated vehicles. Using a single LSM, only heave and surge damping can be provided, but, with a dual LSM, roll and yaw damping can also be achieved. The paper gives design data applicable to the reference design of theCanadian 500 km/h Maglev system.     

基于SIMULINK的异步电机的建模与仿真

利用MATLAB软件中的动态仿真工具SIMULINK，构建了异步电机的仿真模型，并通过实验验证了所建电机模型的可行性、与实用性。     

ASYNCHRONOUS CHARACTERISTICS OF SOLID-IRON SEGMENTED-SECONDARY RELUCTANCE MOTORS

ABSTRACT

Asynchronous characteristics of solid-iron segmented-secondary linear (and rotary) reluctance motors are analyzed using Maxwell's equations. Skin-effect, transverse edge-effect as well as the variation of permeability with slip and primary current are taken into account. Theoretical results are compared with those obtained experimentally for a four-pole laboratory model linear reluctance motor.     

ASYNCHRONOUS PERFORMANCES OF HYSTERESIS MOTORS UNDER UNBALANCED CONDITIONS

ABSTRACT

The torque-speed curves of an hysteresis motor under unbalanced conditions are computed by a numerical method. The magnetic characteristic of the rotor ring is represented by the Preisach-Néel's model. This method takes into account the minor loops which appear on the B(H) characteristic in the case under consideration. Computed and experimental curves are compared. This work shows that eddy currents are of no importance on the shape of these curves     

高压异步电动机的故障诊断及综合保护

本文详细分析了高压异步电动机的故障特征及其现有保护的不足。基于对称分量法理论，本文提出了基于检测负序、零序电流及电流幅的电动机保护方法，该方法能够覆盖高压电机常用故障，并可实现对故障类型的自动诊断，实现了高压电动机的智能化综合保护。     

带冲击负载同步电动机的数字仿真

本文推导了带冲击负载同步电动机数字仿真的数学模型,对这类运行方式下电动机的行为进行了研究。并分析了其励磁调节、最大负载和稳定域及安全域等技术性能指标。     

无轴承永磁同步电机控制系统设计与仿真

无轴承永磁同步电机是自身具有磁悬浮轴承功能的新型特种电机，是一个复杂的强耦合的非线性系统，建立无轴承永磁同步电机径向悬浮力和电机数学模型，是设计无轴承永磁同步电机控制系统的前提，实现其径向悬浮力和电磁转矩之间的解耦控制是电机稳定运行的基本条件。该文在介绍无轴承永磁同步电机径向悬浮力产生原理的基础上，推导了径向悬浮力和电机数学模型，采用基于转子磁场定向控制策略设计了无轴承永磁同步电机矢量控制系统，利用Matlab的Simulink工具箱构建了矢量控制系统，对无轴承永磁同步电机的转速、转矩及转子起浮性能进行了仿真。仿真结果表明控制系统不仅可以实现转子稳定悬浮，而且电机具有良好的动态性能。     

RUN-UP RESPONSE OF POLYPHASE PERMANENT MAGNET SYNCHRONOUS MOTORS

Abstract

An analysis to predict the transient run-up response of permanent magnet synchronous motors is drived based on the d and q axes model. It is based on the segmental reluctance approach with the addition of permanent magnets in the rotor. The computed simulation of the run-up characteristics are provided for variations in the values of stator resistance and permanent magnet excitation. A series of test results of a 3-phase, 2-pole, 1 hp permanent magnet motor are presented In order to verify the theoretical analysis. Effects of stator resistance on the air gap flux are also recorded experimentally. A reasonably close agreement between the measured and calculated values is obtained     

混合励磁直线同步电机的磁场与推力

介绍了一种混合励磁直线同步电机，它的气隙磁场由磁极上的永磁体和电励磁绕组共同提供，采用有限元方法研究了气隙磁场并计算了电机的推力，实验结果很好地验证了有限元分析的结果，另外还提供了一个与同结构电励磁电机进行推力对比的实验结果。研究表明混合励磁直线同步电机的磁场可调，推力大而且变化灵活，既具有永磁直线同步电机的优点，又具有电励磁直线同步电机的优点。     

高效永磁同步电动机

本文阐述了高效永磁同步电动机的设计特点及运行特性。通过ＮｄＦｅＢ永磁同步电动机与感应电动机的性能比较，指出了ＮｄＦｅＢ永磁同步电动机可以获得高效、节能的效果。     

COMBINED FINITE ELEMENT AND ANALYTICAL METHODS FOR ROTOR DESIGN OF PERMANENT MAGNET SYNCHRONOUS MOTORS

ABSTRACT

While design procedures for conventional induction and synchronous machines are now mature and constrained by frame sizes and standards, there are opportunities to use modem CAD techniques to exploit the unique capabilities and characteristics of permanent magnet synchronous motors (PMSM). This paper presents a design methodology involving the use of an analytical model based on generalized machine theory, complemented by finite element analysis. The synergistic interaction of these two methods allows an engineer to design a PMSM to specific requirements with confidence. The effects of machine airgap and of the span angle and thickness of the permanent magnets are evaluated. A set of design specifications and a goodness function are established to select the preferred rotor geometry for a 30 hp prototype permanent magnet synchronous motor.     

DC BRAKING CHARACTERISTICS OF DOUBLE-SIDED LINEAR INDUCTION MOTORS

ABSTRACT

An analysis of dc braking performance of linear induction motors is presented. Specific phenomena such as longitudinal end-effects and transverse edge-effects are taken into account. Computed results are compared with test results available for the dc braking characteristics of the existing largest double-sided linear induction motor.     

自起动永磁同步电动机齿槽转矩的研究

永磁电机中永磁体与有槽电枢铁心之间相互作用,产生齿槽转矩,引起电机振动和噪声.该文提出了一种针对自起动永磁同步电动机的解析分析方法,得到了齿槽转矩的解析表达式.基于所导出的表达式,根据产生机理的不同,将齿槽转矩各分量分为4类,对各类齿槽转矩的特点进行了分析,并研究了斜槽对各类齿槽转矩的影响,研究表明：与表面式永磁电机不同的是,在自起动永磁同步电动机中采用斜槽的方法不能消除所有的齿槽转矩.     

三相异步电机初始方案设计专家系统

本文描述了三相异步电机设计专家系统的总体结构，阐述了在专家系统的指导下进行三相异步电动机初始方案设计的方法，体现了用专家系统的方法设计电机的智能性。     

一种高精度直线同步电机检相器的原理与设计

精确的相位检测是保证直线同步电机正常运行的重要条件.文中提出了基于直线同步电机长定子齿槽效应的相位检测原理,并通过三维有限元分析和实验对其进行了验证.根据检测线圈电感沿长定子周期变化的情况,提出了一种检相器的设计方案,用以确定磁悬浮列车运行中磁极与长定子之间的相对位置.其检测精度在采样频率范围之内可任意设定.通过仿真分析了采样对检相器检测精度的影响.     

新型同步磁阻永磁电机的结构与电磁参数关系分析

该文在简要介绍同步磁阻永磁电机的结构及工作原理的基础上，通过有限元技术分析了电机主要的结构参数，如永磁含有率、气隙、转子层数、饱和、永磁材料特性等对电机主要电磁参数电感和空载剩磁的影响，证明了气隙和永磁(绝缘)含有率是影响电机的最主要参数，气隙和永磁含有率对磁阻特性的影响要远远大于对转子永磁磁链的影响：永磁材料特性是转子剩磁的主要决定因素：饱和是SR-PM电机设计中必须考虑的内容。但转子叠片的层数对电机的平均性能基本没有影响，主要表现为齿槽效应。最后基于分析结果，设计和制造了一台高功率密度SR-PM样机。