电磁电动式磁悬浮装置的磁场分析和力特性研究

针对目前电磁式磁悬浮无法实现静止悬浮,为实现静止稳定磁悬浮的问题,提出旋转磁场电动式磁悬浮装置方案,该装置通过在初级绕组中通入三相交变电流产生圆周运动的交变磁场,与其在次级导体中感应出的涡流磁场相互作用产生悬浮力,能够在装置静止的条件下实现稳定的悬浮.为准确分析装置力特性,建立悬浮装置的多层分环电磁模型对磁场分布求解,并直接利用磁场分析所得的磁场分布结果求解次级悬浮力和水平转矩,给出磁悬浮装置的力特性与其参数的关系;建立有限元模型,分析得出了系统的磁场分布,电磁力等的分析结果;搭建了实验平台对永磁电动式系统的基本特性进行研究,主要是悬浮力和转矩的测试;利用有限元计算和样机实验验证了理论分析和计算结果.     

旋转磁场电动式磁悬浮装置的状态方程与悬浮力控制

为实现静止稳定电动式磁悬浮,设计了一个旋转磁场电动式磁悬浮装置方案,该装置通过在初级绕组中通入三相交变电流产生圆周运动的交变磁场,与其在次级导体中感应出的涡流磁场相互作用产生悬浮力,能够在装置静止的条件下实现固有稳定的电动式磁悬浮。为准确分析装置特性,建立了悬浮装置的电磁模型,采用多层行波磁场理论方法进行磁场分布求解,求得了装置的等效电路,经过数学推导得到了装置的状态方程,并设计了基于次级磁场定向控制的矢量悬浮控制策略。利用有限元计算和样机实验对磁场分布、等效电路参数和悬浮力控制效果进行了验证,结果证明装置能够实现稳定悬浮运行。     

盘式永磁Halbach悬浮装置的磁场和力特性分析

针对电磁式(EMS)磁悬浮实现稳定悬浮需要复杂的闭环控制和悬浮气隙较小等问题,提出的盘式永磁Halbach悬浮装置是一种电动式(EDS)磁悬浮系统,具有悬浮气隙大和不需要复杂的闭环控制即可实现稳定的悬浮等优点.盘式永磁Halbach悬浮装置通过永磁体和导体板上感应出的涡流相互作用产生悬浮力和转矩.从电磁场理论出发建立悬浮装置的分环电磁模型,采用拉普拉斯分离变量方法进行磁场分布求解,并直接利用磁场分析所得的磁场分布结果求解次级悬浮力和水平转矩,给出磁悬浮装置的力特性与其参数的关系,证明在一定的相对速度下,装置可以输出足够大的悬浮力.建立有限元模型,通过分析得出系统的磁场分布以及电磁力等的分析结果;搭建实验平台对永磁电动式系统的基本特性进行研究,主要是悬浮力和转矩的测试;利用有限元计算和样机实验验证理论分析和计算结果的正确性.     

非磁性次级感应悬浮电机磁场和力特性研究

设计和分析一种电动式磁悬浮电机——非磁性次级直线悬浮电机,该电机装置通过在初级绕组中通入三相交变电流产生运动的交变磁场,与其在次级导体中感应出的涡流磁场相互作用产生悬浮力,同时又能产生推进力.为准确分析装置力特性,建立电机的二维数学模型,采用经典电磁场理论方法进行磁场分布求解,并直接利用磁场分析所得的磁场分布结果求解次...     

非磁性次级直线感应电机力特性及涡流损耗分析

针对用于磁悬浮车辆的非磁性次级直线感应电机的力特性和涡流损耗进行研究。该电机初级绕组通入三相对称交流电产生行波磁场,与地面非磁性次级导体中感应的涡流磁场相互作用,可同时产生悬浮力和驱动力。针对非磁性次级直线感应电机力特性及涡流损耗求解问题,以麦克斯韦电磁方程为基础,建立了非磁性次级直线感电机的简化二维电磁模型,对其磁场进行解析分析,得到该类电机的推进力、悬浮力、总机械功率、涡流损耗的解析表达式;研究了涡流损耗与输入电流幅值、频率、转差率之间的关系;找出了合适的工作区间。利用有限元计算软件,计算分析了推进力、悬浮力及涡流损耗特性曲线。实验结果验证了理论计算的正确性。     

永磁电动式磁悬浮装置的研究

针对目前电磁式磁悬浮系统悬浮气隙小且需要复杂的闭环控制等问题,永磁电动式磁悬浮系统具有悬浮气隙大和本征稳定的特性不需要复杂的闭环控制即可实现稳定的悬浮等优点.从电磁场的角度出发,建立永磁电动式磁悬浮系统的数学模型,研究其动态特性,得到悬浮力和制动力的解析表达式;建立Ansoft有限元模型,分析得出了系统的磁场分布,电磁...     

直线型Halbach磁体和导体板构成的电动式磁悬浮系统的分析及实验

永磁和导体板构成的电动式悬浮系统轨道是导体板,磁体使用直线型Halbach型磁体,该系统悬浮力和磁阻力是导体板上产生的涡流和磁体的相互作用的结果.本文建立简化的二维模型,研究该悬浮系统的动态特性,从电磁场方程出发完备求解微分方程,推导悬浮力、磁阻力和浮阻比的解析表达式,并且和Ansoft计算结果以及实验结果进行对照.结果表明电动式悬浮系统二维分析模型是合理的,实验装置的设计制造也是合理的,这些对进一步研究电动式磁悬浮技术是很必要的.     

一种新型电磁阵列悬浮系统的结构设计与特性分析

研制了一种新型电磁悬浮系统装置,该装置利用电磁铁阵列与永磁铁提供空间三维方向的悬浮驱动力。与传统的电磁悬浮系统相比,该系统具有悬浮力大、磁场分布规律、运动范围广等特点,可以明显提高系统的使用效率基于有限元数值方法对悬浮电磁力特性以及合成磁场特性进行详细分析,并做了相关实验。结果表明所设计的电磁阵列悬浮系统装置可以在大气隙下使用,具有较好的稳定性和可控性。     

轴向磁通悬浮感应电机的特性研究与实验

为实现静止稳定磁悬浮,采用轴向磁通悬浮感应电机(AFIMM)替代永磁磁轮悬浮方案。建立了轴向悬浮电机的三维有限元模型,对其磁场分布进行研究。采用分环计算法及多层行波磁场理论表面阻抗方法进行力的求解,得出了悬浮力、转矩与电流幅值、频率、转差率等参数之间的关系。通过实验,验证了理论分析的正确性。     

不均匀气隙工况下轴向磁通永磁电动式磁悬浮电机的磁场与力特性分析

该文以轴向磁通永磁电动式磁悬浮电机为研究对象，针对其运行过程中存在的气隙不均匀工况，在直角坐标下建立求解该电机磁场和电磁特性的三维解析模型。首先，基于等效电流片模型，推导出轴向磁通Halbach永磁阵列的三维空间磁场分布函数。对该磁场分布函数进行傅里叶级数转换，使Halbach转子三维磁场函数具有形式上连续统一的解析表达式。在此基础上，基于二阶矢量磁位，构建该电机的三维解析模型，推导出悬浮力、水平力和涡流损耗的解析表达式，并通过有限元法验证了解析计算模型的准确性。最后，通过小型样机实验，来验证理论计算的准确性。该文提出的解析模型适用于永磁电动式磁悬浮系统的任意气隙工况，可以作为该系统的一般设计方法。     

Revolving magnet wheels with permanent magnets

A new type of actuator with both magnetic levitation and linear drive is proposed. The actuator, called magnet wheel, has a rotating magnetic field obtained by revolving permanent magnets with high coercivity mechanically. The induction repulsive-type magnetic lift force with self-stabilization can be obtained by linking the rotating flux to a conducting plate. The induced simultaneous drag torque, which causes power loss, is used to obtain thrust in two proposed ways. These are called “tilt type” and “partial overlap type,” respectively. In the tilt type, the magnet wheel is tilted against the surface of a conducting plate. In the partial overlap type, the magnet wheel operates near the edge of a conducting plate. In this paper, the fundamentals of the structure of proposed magnet wheels are described. The basic characteristics at parallel to the conductor are shown by using a numerical three-dimensional electromagnetic analysis and measured results. The generation of both lift force and thrust in tilt type and partial overlap type magnet wheel are proved by experiments, respectively.     

Fundamental characteristics and 3D electromagnetic analysis for magnetic levitation transporter using YBCO superconductors

A magnetic levitation device with two‐dimensional movement, the so‐called “levitating X‐Y transporter,” has been developed. In order to develop a working levitating X‐Y transporter, it is necessary to clarify the levitation characteristics, such as the lift force, levitation height, and stability against mechanical disturbances. In this paper, we examine the lift and the restoring force experimentally and propose a new simulation program based on the three‐dimensional hybrid finite and boundary element method to analyze the dynamic behavior of electromagnetic characteristics of YBCO bulk. Using the numerical simulation and experiments, we investigated a suitable arrangement of permanent magnets to enhance the levitation characteristics. We also designed a levitating transporter which can carry a load of 200 kg with a gap of 16 mm. © 2007 Wiley Periodicals, Inc. Electr Eng Jpn, 159(2): 44–54, 2007; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20220     

Electrodynamic magnetic suspension-models, scaling laws, andexperimental results

A simple experiment illustrating the principles of electrodynamic magnetic suspension is described and test results are given. A disk-shaped coil made of insulated copper magnet wire and energized with 60 Hz AC line voltage is levitated in a stable equilibrium position above a wide aluminum plate. The mechanisms generating levitation force are identified by the use of Maxwell's equations. A lumped-parameter inductance model is used to model magnetic energy storage. By using energy methods, the current necessary to achieve coil lift-off and levitation is estimated, with good results. A stability analysis is done which shows that the levitation is stable, but underdamped. Thermal models are also developed for determining temperature rise in the coil. The magnetic scaling law is developed which shows that larger magnetic structures are more efficient in energy conversion than small ones     

Eddy current magnetic levitation. Models and experiments

We present a simple demonstration of eddy-current magnetic levitation using a small copper coil, energized with 60 Hz AC and levitated over an aluminum plate. The processes that generate magnetic forces are identified using Maxwell's equations. Through this experiment, a method for determining lift-off power, levitation height and suspension resonant frequency is shown. The principles outlined in this article have numerous applications to magnetic levitation, induction heating and other electrodynamic processes involving induced eddy currents. Scaling laws show how to size a suspension conductor and power supply for a given levitated load