永磁式减速直线同步电机稳态运行特性的分析

考虑直线电机的静态纵向边端效应,应用有限元法,计算得到永磁式减速直线同步电机初级三相绕组的电感参数,提出分析该类电机的数学模型,其中假定轴向永磁体在初级绕组中感应的电势对称,基于该模型通过仿真计算不同的电磁瞬态来求得实验样抽矩角特性和稳定工作特性,理论计算与实验结果证明所提出的理论分析与计算方法是正确有效的。     

反应式减速直线同步电机稳态运行特性的仿真

基于有限元法，考虑纵向边端效应的影响，计算出反应式减速直线同步电机线性电感参数，由电压平衡方程式得到分析该类电机的线性数学模型。高于该模型计算不同电磁瞬态求得该类电机的矩角特性和稳态工作特性。计算结果与实验结果吻合，证明了方法的正确性。     

永磁直线同步电动机静特性及优化设计

从永磁直线同步电机的结构出发,得到电机的推力解析解,在有限元电磁计算软件的基础上分析计算了电机的静态力特性、磁场分布特性;通过与试验数据比较,验证了有限元计算的精确性,并在此基础上指出电机优化设计的方法。可供永磁直线同步电机的进一步研究做参考。     

专用直线振荡电机的振荡特性分析

文章介绍了直线振荡电机的一般原理，然后从电机的电磁特性，受力特性，运行特性，频率特性等方面对直线振荡电机的振荡特性进行了分析，并且用MATLAB对振荡特性进行了仿真，最后给出了实验电机的一些具体参数，实验结果与理论分析基本一致。     

六相永磁直线同步电机电磁特性分析及数学模型建立

为深入研究新型永磁直线同步电机(PMLSM)的性能,实现电机结构设计与控制优化,对其电磁特性及数学模型的建立展开了研究。针对暂态时间、饱和特性及不对称性等电磁特性进行分析,然后建立了abc坐标系和dq0坐标系下电机数学模型,由此阐述电机电磁耦合关系,继而建立了等效电路,并对瞬态工作特性进行计算。最后,通过电压测试值和瞬态推力有限元值与解析计算值进行对比,其结果吻合度较高,验证了数学模型的正确性。     

新型永磁外转子爪极电机的特性仿真

为了研究具有特殊结构的新型外转子爪极电机的运行特性,在对电机的结构、材料、特点以及运行机理进行分析的基础上,利用有限元分析软件,建立了对电机进行三维电磁场分析的仿真模型。采用场路耦合分析方法,通过ANSYS和CASPOC系统仿真软件的耦合计算,得到了在发电和电动两种状态下的系统仿真特性。仿真结果表明,该种电机具有功率密度和转矩密度大的特点,在发电和电动状态都表现出良好的运行特性。     

反应式减速直线同步电机力角特性的数值分析

反应式减速直线同步电机是一种新型的电机,在定电流源情况下,提出通过求解不同次级位置时的静态场得到反应式减速直线同步电机力角特性的新方法。计算结果与实验结果相吻合,证明方法是正确的。     

分段式永磁直线同步电动机有限元分析

为了研究提升系统的分段式永磁直线同步电动机(PMLSM)的运行特性,首先建立了其稳态有限元分析模型,分析了不同动子位置时电机的磁场分布,计算了不同动子位置、不同电枢电流时电机的静态力-位移-电流特性,得到电磁参数随动子位移及电枢电流的变化曲线;然后建立了分段式PMLSM的时步有限元分析模型,对分段绕组两两并联供电方式下,起动过程的动态特性进行了计算,得到动态过程中电枢电流、感应电动势、电磁力、动子运行速度、位移等物理量随时间变化过程.经实验测试验证了分析结果的正确性.     

直线同步永磁电励混合式电动机的研究

本文将永磁材料应用于直线同步电机励磁系统,得到了直线同步永磁电励混合式电动机。经过对其等效磁路的分析,说明了该电机的特性,并详细阐述了设计步骤和要点。接着建立了dq0坐标系统下的电机模型,通过仿真得到了该新型电机和直线同步电励磁电机的电磁推力,与相应的实验结果进行了对比,仿直结果与实验结果基本吻合,表明直线同步永磁电励混合式电机推力大而且灵活可调,兼具有永磁直线同步电机和电励磁直线同步电机的优点,能够显著改善电机的运行性能。     

垂直运动永磁直线同步电动机运行特性分析

分析了频率变化对永磁直线同步电动机运行特性的影响，定义并重点讨论了垂直运动永磁直线同步电动机的动力制动特性、能耗制动特性及加速度特性，分析和讨论建立在永磁直线同步电动机线性理论基础上，得出的结论对永磁直线同步电动机的设计及垂直运动运行特性控制策略有指导意义。     

基于虚功法的直线同步电机电磁力计算

为计算电磁型磁悬浮列车(EMS-MAGLEV)使用的直线同步电机的牵引力及悬浮力,提出了用虚功法进行电磁力计算;同时建立了EMS型磁悬浮列车的有限元分析计算模型,推导出牵引力和悬浮力的计算公式,并将计算结果与成熟的商业软件ANSYS计算出的结果进行了比较,从而证明了用虚功法计算电磁力的正确性;另外,上述方法可以直接添加进现有的有限元软件,具有很好的兼容性。     

直线同步电机的磁场与力特性分析

本文通过合理的假设，建立了直线同步电动机的磁场分析模型，在此模型的基础上，运用基本的电磁场理论，经推导得到了直线同步电机电磁场的解析表达式以及驱动力和悬浮力的表达式。经过实验的验证，与实验值基本吻合，并对实验结果进行了分析。     

Test run of combined propulsion,levitation and guidance system at Miyazaki test track

In commercializing the superconducting Maglev system it is important to reduce the cost, especially that of ground coils constructed along the whole length of the guideway. For this purpose we have examined the combined propulsion, levitation and guidance system (PLG system) which can generate levitation, guidance and propulsion forces by the same coil. This paper describes the test run of the PLG system, whose ground coils (PLG coil) are constructed in one part of the Miyazaki test track. In designing the PLG coil, we make clear the magnitudes of the force acting both under normal and unusual conditions because the electromagnetic force, which levitates, guides, and propels the vehicle, directly acts on the magnet winding of the PLG coil. In the experiment, we examine both the performance of the vehicle and the force of a PLG coil. The measurement of the force at the PLG coil gives not only propulsion force and levitation force directly, but also guidance stiffness by sifting the measured coil. Good correlation recognized between the calculation and the experiment in the propulsion force, levitation force, and guidance stiffness proves that the required characteristics can be expected from the PLG system even under combination of propulsion, levitation and guidance.     

Levitation force assist through LSM armature currents in superconducting maglev vehicle

In a superconducting maglev vehicle, levitation forces produced by the interaction between the ground levitation coils and the onboard SCMs become insufficient when the running speed is low. This paper presents a levitation force assist method through the control of LSM armature currents, which usually function to generate propulsion forces. The levitation assist system is constructed in terms of d‐axis armature currents, leading to the definition of the vertical force coefficient of propulsion system. The calculated results show the feasibility of the system, which produces damping forces as well as levitation assist forces. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 155(4): 45–52, 2006; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20260     

Trajectory control of controlled-PM linear synchronous motor magnetic levitation vehicle—FEM dynamics simulations and experiments in mass-reduced-control mode

A novel magnetic levitation train system can be constructed by using a long-stator controlled-PM linear synchronous motor having propulsion and attractive-mode levitation functions and minimum loss. Realizing this system requires simplifying manufacture of the long-stator guideway. In the long-stator on the ground, semiclosed large slots are adapted and designed for one-turn coils of a waveform to be easily installed. The large slots cause the PM LSM detent forces to give strong influences on dynamic operations of the running vehicle. A two-dimensional FEM used for the dynamics simulations is capable of precisely analyzing the detent forces produced between the stator teeth and the PMs. This paper presents FEM dynamics simulations and experiments in mass-reduced-control mode of a 1/2 scale model magnetic levitation vehicle supported by small rubber rollers. The simulation model developed here includes the vehicle speed performance, position sensors and drag force due to friction between rubber roller and rail. The detent force problem in propulsion motion is successfully solved by adapting the feedback control of the vehicle propulsion based on the I₁₀-controlled method. The trajectory control is thus accomplished for the vehicle to follow speed and position patterns. The dynamics simulations are verified from the experiments. The simulation program proposed here enables us to investigate the magnetic levitation train system, including LSM design and vehicle dynamic operations.     

高速磁浮列车电磁力的软测量技术

针对高速磁浮列车在运行过程中电磁力难以直接测量的困难，采用有限元分析软件ANSYS建立了悬浮电磁铁的二维模型，并对模型进行了有限元分析与计算，得到了其内部的磁力线分布情况以及磁浮列车在不同运行情况下的电磁力数据，并总结了推力和悬浮力随功率角、气隙、定子电流和转子电流的变化规律，在此基础上采用最小二乘法建立了指数形式的电磁力软测量模型。采用该模型，列车在运行过程中所产生的电磁力可以通过气隙、定子电流和转子电流的测量结果计算得到。该模型的最大误差小于1％，为高速磁浮列车运行过程中电磁力的计算和控制提供了重要依据。     

Characteristics of LSM combined propulsion,levitation and guidance

In commercializing the superconducting maglev system, it is important to reduce the cost, especially that of ground coils installed all along the guideway. The ground coils designed for Yamanashi test track under construction are composed of both octagonal-shaped null-flux coils for EDS (Electrodynamic Suspension) and double-layered armature coils of LSM (Linear Synchronous Motor). The former reduces the magnetic drag of the running resistance, and the latter reduces the electromagnetic fluctuation in the superconducting coils. In addition, the octagonal-shaped coils can generate propulsion force by being connected to the power supply. This system can generate levitation force, guidance force and propulsion force by the same ground coils. Therefore this system is expected to reduce the cost of ground coils, the number of which is decreased. This paper presents the principle and analytical formula of the combined propulsion, levitation and guidance system (PLG system), including one for angles. In addition, using numerical examples, the characteristics of this system are expressed.     

常导高速磁浮列车电磁场的研究

常导高速磁浮列车由长定子直线同步电机驱动,其定子由轨道构成,转子由车载悬浮电磁铁构成,其悬浮和推进电磁场的研究对保证列车悬浮系统和推进系统的性能和可靠性具有重要意义.采用有限元法研究了常导高速磁浮列车的悬浮和推进电磁场.分析和计算结果表明,由于定子齿槽和材料不连续的影响,悬浮力和推力都存在六倍频的波动.     

基于有限元法的高速磁浮列车优化设计

采用电磁场有限元法对高速磁浮列车电磁铁进行了分析 :首先研究了定子和发电线圈槽对悬浮力的影响 ;其次分析了电磁铁的磁场分布 ,对电磁铁结构进行了优化设计 ,提高了承载能力 ;最后对定子与转子极距匹配进行了优化设计 ,减小了悬浮力和推进力的波动。为电磁铁的优化设计提供了重要的参考依据。     

低速磁浮列车竖曲线电磁力计算

低速磁浮列车通过竖曲线时电磁铁与轨道不再平行,如果曲线半径较小,采用常用的计算方法计算此时的电磁力将产生较大的误差,难以满足动力学建模和悬浮控制器设计的要求。基于磁通管法推导了电磁铁位于竖曲线时电磁悬浮力的解析式,并对解析式进行适当的简化和拟合,用Ansoft有限元仿真软件对磁场进行数值计算,仿真结果表明,基于磁通管法得到的电磁力更接近有限元计算结果,验证了解析式的正确性,解析式能为悬浮控制系统的设计提供更准确的设计参数。