电磁力

Finally, the wave equation of the electromagnetic field of this kind damper isderived from the Maxwells equation. The magnetic flux density at the boundary isassumed to be harmonic, so the analytical result of the wave equation is solved. When therotor rotates, eddy currents flowing inside the conducting material field are caused. Thetangential force acting on the rotor because of the action between eddy currents andmagnetic field is produced. The tangential force causes a retardation torque, which leadsto the increase of power and heating effects.

最后，应用Ahrens的电磁轴承简化模型，从Maxwell方程出发推导了应用于本文所述的被动式电磁阻尼器的波动方程，并用傅立叶级数把矩形磁场展开的谐变磁场作为磁场的边界条件，通过求解波动方程得到磁场的解析解，从而计算了阻尼器对转子的电磁力和由涡流引起的切向力产生的阻尼器附加功耗。

The rules of fluid rate with different technical parameters: the increase of electromagnetic force causes the increases of the fluid rates at S/L interface and free surface, the decrease of skin depth, the increase of electric current density which will make the fluid at free surface flowing faster, while it doesnt affect the fluid rate at S/L interface. When the height of melt increases, the both of fluid rates will increase too. The increase of the width-thickness ratio augments the fluid rates along the wider edges at S/L interface evidently, while the rates along the narrow edges will have little change, and the rate at free surface has little change too. The increase of overheat degree minishes the range of mush zone, while the fluid rates at S/L interface and free surface will increase evidently.

流速的大小随各种不同工艺因素的变化呈现出一定的变化规律：随电磁力的增大，固液界面以及自由表面处的流速都会增大；集肤层渗入深度变薄，电流密度增大，会导致自由表面上流动的加强，但对固液界面处的流动速度影响不大；熔区高度的增加，也会使固液界面及自由表面处的流动增强；宽厚比增大时，固液界面上沿宽面方向的流动显著增强，但窄面方向流速变化不大，同时自由表面上流速变化也较小；过热度及温度梯度的增大，使糊状区减小，导致固液界面及自由表面处的流速显著增大。

The purpose of the research is to make the north-seeking system much more accurate and raise its speed at the same time. This paper analyzes the mechanical and electronic structure of the magnetic north-seeking system, introduces its working principle.

并在研究磁轴承简化物理模型和分析电磁轴承工作原理的基础上，推导了电磁轴承的电磁力计算公式，得出磁轴承的单自由度传递函数，分析了转子低速运行时的特性得出了系统传递函数。

Based on the electromagnetic theory, analyze the character of electromagnetic force using two linear electromagnetic stirrers which were designed by our department. Investigate the rule of electromagnetic force and how the different parameter of casting and stirring influnce the solidification structure.

本文采用理论分析与实验研究相结合的方法，在实验室条件下，采用本系最新自行研制的行波磁场搅拌器对在行波磁场电磁搅拌作用下钢液内的电磁力特性、各种不同浇铸工艺参数以及搅拌参数对铸坯凝固组织的作用规律，进行了深入的研究。

Base on nonlinear electro-magneto-elastic soupled dynamic equations of the plate and the expression of electromagnetic forces, the vibration equations of the thin beam plate under uniform transverse magnetic field and mechanical loadings are obtained.

在给出薄板的非线性电磁弹性耦合运动基本方程及电磁力表达式的基础上，得到了横向稳恒磁场和机械载荷共同作用下梁式薄板的振动方程。

And then dynamic process including starting,losing step,reclosing and open-phase operations were analyzed with tine-stepping finite element method and field experiments.

首先研究了同步电机动态分析的共性问题，即局部电磁力、电磁转矩计算与场-路-运动直接耦合求解问题，进而对稀土永磁电机起动、失步、断相、重合闸等动态过程进行时步有限元分析和实验研究。

My working hypothesis is that, besides strengthening the natural bioenergy of a person, Clarus SRT also appears to clarify the electromagnetic forces themselves.

& &我的工作假设是，除了加强自然生物的人， Clarus塞尔维亚广播电视台似乎也澄清自己的电磁力。

An electromagnetic power steering kinematics model is built combined with the sensor and power equipment"s kinematics characteristic, then according to bond graph theory the bond graph model and diamond model of the electromagnetic power steering system are built based on the kinematics model. They could lead to the system"s transfer function, which is combined with automobile"s two freedom degree model, finally leads to the system"s model in condition with step input of steering wheel.

结合转矩传感器和电磁力发生装置的动力学特性建立了电磁式助力转向系统的动力学模型，然后在系统的动力学模型的基础上根据键合图理论建立了电磁式助力转向系统的键合图模型及其方块图模型，从而导出系统的传递函数，再结合二自由度汽车模型，最终建立了系统在方向盘转角阶跃输入下的模型。

Three-phase embed electrode salt bath furnace use the salt class as heating impregnant, according to the different operating temperature, could select different ingredient salt or compound salt, the salt is not electric beforemelting, therefore the salt bath furnace must use the starting-electrode to melt when using, because the electricity bring quantity of heat unceasingly through electric dissolving salt, so can maintain the dissolving state, because of electrode under the electromagnetic effect,make the dissolving saltcycle unceasingly through natural convection and magnetism mix round,therefore can well-proportioned heat workpiece rapidly.

三项埋入式电极盐浴炉采用盐类作加热剂，根据不同的工作温度，可选用不同成份的盐或混合盐，盐在熔化前是不导电的，因此盐浴炉使用时必须使用起动电极溶化，由于电流通过导电的溶盐不断产生热量，故可保持溶化状态，因电极在电磁力的作用下，通过自然对流和电磁搅拌而使熔盐不断循环，故可迅速和均匀的加热工件。

First, outline: present, in the universe has each type the strength, is they the loose sand fundamental particle unifies in together, has composed various materials, these strength from may sum up essentially are four kind of fundamental forces: Attraction, electromagnetic force, force and weak strength.

目前，宇宙中存在着各种类型的力，是它们把散沙般的基本粒子结合在一起，组成了各种各样的物质，这些力从本质上都可归结为四种基本力：引力、电磁力、强力和弱力。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。