Because the excitating voltage ' s frequency is 0 . 5hz , the signal of induced voltage is very small , even though smaller than noise . so how to accurate pick the weak signal is the key of measuring dc magnetization characteristic 由于激磁电压为0 . 5hz ，因此其感应电压非常小，甚至小于干扰信号，如何准确的采集到该弱信号是进行直流磁化特性测量的关键。
2 ) an efficient model based on physical similarity was made to simulate the current transformers " nonlinear magnetizing characteristics and to compensate error from outside . a similar magnetizing current extracting method based on bang - bang control was advanced to maximally extract the similar magnetizing current ( 2 )针对电流系统中大量运行的0 . 5级电流互感器，利用物理相似原理在互感器二次构造相似电流互感器，提出基于bang - bang控制的相似激磁电流提取方法，能够最大程度的提取相似激磁电流。
The mathematical model of non - linear transient magnetic field excited by voltage source is established in this paper . it coupled with electric circuit equation and mechanical motion equation , could solve the transient problem excited by voltage source , and the effect of the eddy currents , non - linearity in magnetic materials and mechanical motion of medium is taken into account 文中建立了电压源激磁下的非线性瞬态磁场的数学模型，通过把瞬态磁场方程、电路方程及机械运动方程耦合在一起，得出求解电压源激磁下，考虑铁磁材料的非线性、导电媒质的涡流及媒质机械运动等条件下的瞬态过程问题。
Then , the detailed finite - cell analytical process of electromagnetic field is given , and analytical result is discussed and compared . finally , the whole project , double inspirit magnetism structure , is confirmed , and the parameter of double inspirit magnetism structure is confirmed 最后，对两种初步方案双激磁结构与单激磁结构的有限元结果进行比较分析，最终确定了总体方案? ?双激磁结构，并对结构参数逐一确定，作为最终的设计数据进行最后的系统集成设计工作。
Abstract : based on analysis of the operational principle of the traditional inductosyn digital display meter in the paper , the contradiction between detecting resolution ratio and antidisturbance ability is discovered . and then , to resolve the contradiction , the method of demodulation technology and high frequency excitement technology being used is advanced 文摘:通过分析传统鉴相型数显表的工作原理，揭示了其检测分辨率与抗干扰能力之间的矛盾，并提出了采用差频解调和高频激磁等技术解决矛盾的方法。
Then a thorough analysis to the bias - magnetic of ppfc is made . the retraining effects of the main parameters ( include clamping capacitance c , output filter inductor lf , load r , the leakage inductor ls and source winding resistance r ) are studied under the conditions of different von , different ton and different winding parameters . then a conclusion can be drew , that the smaller lf and the bigger r are , the better the bias - magnetic is restrained and c has a best value to retrain the bias - magnetic 分别对管压降不同,导通时间不同以及两原边绕组参数不一致(包括漏感、电阻、激磁电感三种情况)的情况下,主要参数(包括箝位电容c 、输出滤波电感lf 、负载r 、原边绕组漏感ls 、原边绕组电阻r )对偏磁的抑制作用进行了仿真分析研究,得出lf越小, r越大时激磁磁势偏移量ni越小, c在其他参数确定时对抑制偏磁有最优值等结论,为参数的优化设计提供了依据。
Applying the theory on hydrodynamics and combining the structure of the pump , the method of calculating the flux is found , using the simulating dual pump which mercury serve as the working medium , by the experiment on the electromagnet used in the dual pump , the optimum method of the coil connection is gained ; by the experiment on the relation the static pressure and the working parameter in different groove structure , a high - efficiency groove structure named as " + " shape are devised ; by comparing the static pressure and flux between single pump and dual pump , the conclusion that the flux of dual pump is about 1 . 6 times as much as the flux of single pump is educed , and prove it practical that the dual pump is adopted to increase the flux 利用水银为工作介质的双联电磁泵，通过对双联电磁铁不同接法的实验研究，找到最佳激磁线圈接线方法；通过对不同流槽结构的静压头与工作参数关系实验，研究得出一种高效率的新型流槽结构? ?十字型流槽结构；通过对单泵、双泵的泵高和流量实验，得山了在同等工作条件下，双泵流量大约为单泵的1 . 6倍的结论，从而证明了采用双联泵的方法来提高直流电磁泵的方法是切实可行的。
The paper proves that in the 2d non - linear case , the coulomb gauge is been meet naturally . in the paper , the second - order isoparametric fem is adopted in the non - linear transient magnetic field simulating excited by current source and the results of transient field and static field solved by the second - order isoparametric and linear fem are compared and analyzed , besides , the effect of the eddy currents in the magnetic materials of the different conductivity is analyzed , it is obtained that the magnetic material of high magnetic conductivity and low loss should be chosen in designing of pma 文中采用二次等参元有限元法推导出在电流源激磁下的非线性瞬态磁场的计算方法和编制了相应的计算程序，并采用二次等参元有限元法和双线性有限元法分别对瞬态场和静态场进行了计算，并对计算结果进行了误差分析，此外，还对不同电导率的导磁材料中涡流产生的影响进行了分析，得到结论设计永磁操动机构时，应选择导磁性能好，损耗低的导磁材料。
In order to increase the utilization of transformer core and reduce the number of transformers , the two - transisteor integrated - magnetics forward converter is studied in this paper . the phenomena about magnetic deviation due to asynchronism of duty cycle and other parameters is analyed , and the converter works normally although there is magnetic deviation . the working principle of circling current is analyed , and a improving circuit is present to decrease the circling current 分析了双管正激磁集成变换器的环流产生机理，提出了一种减小环流的方法；研究了占空比等参数不一致导致的磁芯偏磁问题，磁芯存在单向磁化现象，但不会出现单向磁饱和，变换器仍能稳定工作。
