By using the 3-D finite-element software ANSYS, the contact partial magnetic field distribution of limiting current circuit breaker was analyzed, the Holm force and the Lorentz force of contact system were calculated, while the affecting factor to Lorentz force was analyzed.
基于触头系统的电动斥力对限流式断路器的分断具有重要影响，利用三维有限元软件ANSYS分析限流式断路器触头部分磁场的分布，并统一计算触头系统的Holm力和Lorentz力，分析影响Lorentz力的因素。
The transient air gap magnetic fields under different conditions are also calculated and analyzed. The novel finite element method directly using magnetic induction as unknown variable has many advantage. It is analyzed theoretically in detail. Nonlinear eddy current field equations and finite element equations using magnetic induction as unknown variable are developed.
直线电机的磁场是一非均匀、非线性的涡流场，文中对非均匀磁场及材料的非线性进行了分析，提出了相应的解决办法，采用以向量磁位为求解量的传统有限元法，对不同合闸角下筒式复合次级圆筒型直线感应电机的瞬态特性进行了计算与试验分析，对不同条件下瞬态气隙磁场进行了研究。
The software is comprised of three parts. The first part is simulating the magnetic field while the probe is working using the ANSYS finite element analysis software, providing the base for the probe design. The second part is analyzing and processing the acquisition data by Matlab software. The signal is smoothing and filtering through the method of numeral synchronous accumulation, polynomial fitting, wavelet transform. It makes a preparation for picking the signal feature value. It can get the depth of the crack by using the difference between the peak value of the acquisition data on cracks and in air in the end. The third part is constructing a real-time pulsed eddy current system with InSb magnetoresistor through combination of LabWindows/CVI and Matlab to achieve the real-time online testing.
软件部分包括利用ANSYS有限元分析软件仿真探头工作时，在周围空间产生的磁场分布，为探头的设计提供依据；利用Matlab软件实现对采集信号的分析和处理，通过同步累加、多项式拟合、小波变换等多种方法实现对信号的滤波与平滑，为信号特征值的提取作准备，最终通过裂纹处与空气中采集信号峰值的差值提取裂纹深度信息；利用LabWindows/CVI与Matlab相结合，构建实时的InSb磁敏电阻脉冲涡流检测系统，实现裂纹的实时检测。
The output equation and the current expression of the motor have been analytically derived. The way to extend the operation speed range has been explored and a split-winding theme has been proposed to extend the speed range of the DSPM motor. Based on the finite element analysis, a nonlinear varying-network magnetic circuit model has been proposed. Moreover, a new method of measuring the inductance has ben proposed, which can reflect the strebthening and weakening actions of the armature flux to the PM flux. The reasons of torque ripple in the motor has been analyzed and measures to minimize the torque ripple have been developed.
导出了电机输出方程和绕组电流解析表达式，探讨了扩展电机转速范围的途径，提出的分裂绕组方案能有效扩展电机运行区；在有限元分析基础上进一步提出非线性变网络等效磁路模型；探讨了绕组电感测量方法，提出了峰值电流法以正确测取电枢磁场为增磁和去磁作用时所对应的电感；分析了转矩脉动的原因并提出了抑制转矩脉动的措施；研究了电机设计方法，设计制作了三种规格样机4台。
The conception of the edge element was firstly proposed by Whitney in 1957. At the beginning of 1980's, Bossavit and Verite put it to practical application to three-dimensional eddy-current problems. In 1987, Barton and Cendes applied the tetrahedral element to three-dimensional magnetic calculation.
棱边元的构想，最早由Whitney在1957年提出。80年代初期，Bossavit和Verite将四面体棱边元应用于三维涡流问题，1987年，Barton和Cendes将四面体棱边元首次应用于三维磁场计算揭开了基于棱边的有限元方法在电磁问题中应用的序幕。
By using 3D finite element method, axial magnetic field characteristics of single coil contacts used in 252 kV vacuum interrupters were analyzed with single factor analysis and orthogonal regression analysis. The analyzed AMF characteristics include axial magnetic flux density at current peak, axial magnetic flux density at current zero, and conductor resistance. Regression equations that link AMF characteristics and contact parameters were given. Contact parameters that have significant influence on AMF characteristics were shown.
该文采用三维有限元方法对用于252 kV真空灭弧室的单匝线圈纵磁触头的磁场特性进行了单因素分析和正交回归分析，包括电流峰值时纵向磁感应强度、电流过零时纵向磁感应强度和导体电阻值，得到了磁场特性和触头设计参数之间的回归方程，并且找出了影响磁场特性的显著因素。
Radial component of magnetic field is one of main limits of Bi2223/Ag magnet`s critical current and stability. Finite Element Method is used to analyze magnetic field distribution.
1引言近年来Bi2223/Ag超导带的临界电流密度和机械性能有了长足的进步，使得Bi2223/Ag超导磁体在各相关领域的应用成为可能。
Based on the reviewing for the previous researches, the winding loss mechanism of the transformer is analyzed deeply through decomposition of winding current and Finite Element field simulation. And it is found that the magnetic fields inducing the total winding loss have both behaviors with inductor's and transformer's field.
在已有研究基础上，应用电磁场有限元仿真以及通过分解线圈电流分析了反激变换器的变压器线圈涡流损耗机制，发现其线圈窗口磁场兼有电感器和变压器磁场的特征。
O study the effect of the coil shape and geometric parameters on the sensitivity and linear measurement range of eddy current sensor, the magnetic flux distributions of any point on the symmetry axis of the rectangular and cylinder coils with trapezoid cross－section are derived based on Biot－Savart law. And the cylindrical coil is determined to be the more reasonable coil shape of ECS, in which the displacement is the measurand using finite element method. Then the effects of internal and external radiuses, thickness, cross section shape (rectangle, trapezoid and reversed trapezoid) of the cylindrical coil on the performances of ECS are investigated under two cases: the turn density of the coil is fixed and variable. The conclusions from the study provide a reference for determining the coil shape parameters and optimizing the performance of ECS.
针对电涡流传感器探头线圈形状及其参数对传感器灵敏度和线性范围的影响问题，本文以Biot－Savart定律为基础，推导了具有梯形截面的矩形柱线圈和圆形柱线圈对称轴上任一点的磁场分布，确定了在以位移为检测量的电涡流传感器中采用圆柱线圈更合理，并通过有限元法研究和分析了在线圈匝数密度不变和变化2种情况下圆柱线圈内径、外径、厚度、截面形状对传感器灵敏度和线性范围的影响，为合理选择线圈参数和优化传感器性能提供参考。
Alternating and direct current wet continuous magnetic particle inspection (MPI) methods, combined with metallographic examination and trace element microanalysis method, were used to determine the nature of the 300M steel magnetic particle indications.
采用交、直流磁粉检验并结合金相试验、电子探针试验及微量元素含量分析的方法，对300M钢磁痕现象的本质进行了分析。
To lose sight of paired magnetic dipole brim and to equate bound current element, making certain direction and magnitude of a force upon it by Ampere Law.
若忽略磁偶极子对的边缘效应，并将其等效成束缚电流元，可用安培定律来确定其受力大小和方向。
The Finite Element Method Calculation of Magnetic Flux Distribution of Track Eddy Current Braking Device
线性涡流制动装置磁场分布的有限元计算
Based on the three calculating models of permanent magnet, the variation forms of the equivalent magnetic charge model and electric current model are deduced respectively by the method of functional analysis, and the finite element method of the equivalent magnetic charge model is introduced in detail.
在介绍三种永磁体空间磁场计算模型的基础上，利用泛函理论分别推导出等效磁荷模型和等效电流模型对应的变分形式，并就等效磁荷模型详细地介绍了有限元法。
The influence of the electromagnetic properties of the axial magnetic bearing caused by non-magnetic metal ring using eddy current theory and finite element method has been studied.
文中从涡流理论和有限元分析这两方面，对轴向磁路中的非导磁支承环对轴向磁悬浮轴承电磁铁性能的影响进行了理论分析。
The regularity between inverter switching frequency and stator current harmonic frequency is summarized by experiments, and the expressions of air gap magnetic field frequency and inverter switching frequency is deduced by 3D motional magnetic field Finite Element Method (FEM) calculation and analysis.
通过实验总结出变频器开关频率对定子电流谐波的影响规律，利用三维运动磁场的计算和分析总结出气隙磁场谐波频率与变频器开关频率的关系表达式。
The best impelled current of the electromagnetic iron was determined by experiments, and magnetic induction intensity in electromagnetic acoustic transducer (EMAT) testing steel pipe's defaults was calculated by ANSYS finite element software.
通过实验研究，确定了电磁超声传感器最佳励磁电流，利用ANSYS有限元软件，对用于钢管缺陷检测的电磁超声传感器的磁感应强度进行了计算，得到磁感应强度的分布规律。
The limited element model of main transformer in power locomotive is established. The three dimensional leakage magnetic field in transformer is analyzed. The loss and the distribution of eddy current in clamping plate of core are calculated.
建立了电力机车主变压器有限元模型，分析了其三维漏磁场，计算出了铁心夹板的涡流分布和涡流损耗，并对铁心夹板进行了优化。
Third analysis current transformer internal leakage magnetic field in the method of finite element electromagnetic analysis, in connection with the same model and boundary conditions, by making several comparisons of real parameters, propose optimization schemes of the internal structure of the transformer.
再运用有限元电磁分析方法，对电流互感器内部漏磁场进行分析，针对同一模型和相同的边界条件，通过进行几组实型参数对比，提出互感器内部结构优化方案。
The gap magnetic circuits of BPMSM are studied using finite element method when the currents in radial force windings are changed under the invariable equivalent current in torque windings.
用有限元分析和计算方法，讨论了无轴承永磁同步电机在定子绕组相应等效电流作用下，改变径向悬浮力绕组中的电流，电机气隙磁路分布状况；
By way of the current element simplified model, the distribution of magnetic field on armature was calculated, and then the electromagnetic force acted on armature was obtained.
通过应用电流元简化模型的方法，计算电枢上的磁场分布，进而计算电枢所受的电磁力。