磁极

这个地方被称为北磁极，它随着时间的推移而漂移。

It 's called the North Magnetic Pole and it wanders over time .

单一的、孤立的磁极从来未找到。

A single , isolated magnetic pole has never been found .

但在20世纪90年代，北磁极离开了原来的地方，迅速穿过北极，向俄罗斯移去。

But then in the 1990s , it took off , racing3 across the Arctic towards Russia .

早在19世纪初，人们在加拿大北部发现了北磁极，那时它只是缓慢地向纬度较高的地方漂移。

Back in the early nineteenth century , it was sighted in the north of Canada and was drifting only slowly to slightly higher latitudes2 .

考虑到北磁极在快速地移动，全球的导航系统刚刚升级。科学家表示，北磁极的移动可能还会持续几十年。

World navigation systems have just been updated to account for the pole 's rapid movement , which the scientists say , could continue for decades yet .

进而将双反应理论拓宽，使其适合具有P对极的磁极非均匀分布的模型电机。

The double reaction theory is generalized for the model .

基于Pro/ENGINEER的磁极锻模CAD系统的研究

Research on the Forging Die CAD System of Alternator Pole Based on Pro / ENGINEER

论文着重介绍了轴向双磁极组同步发电机的结构设计、电磁参数设计、ANSYS仿真分析、空载和负载试验。

This paper mainly introduces the axial double pole synchronous generator structure design , electromagnetic parameter design , ANSYS simulation analysis , no-load and load experiment .

K-Ar法在第三纪地磁极性事件研究中的尝试

Attempt on studying tertiary geomagnetic events by using K-Ar chronology

处于永磁铁磁极之间的磁工质其内部的磁场强度H由磁铁工作点，工质形状，以及工质温度等多种因素决定。

The magnetic field intensity of a magnetic working substance located in the gap of permanent magnet is determined by working point of the magnet , the shape and temperature of the working substance .

通过预装的霍尔位置传感器和增量式编码器的输出信号，DSP采用粗精两级磁极搜索方法，获得转子磁极的精确位置，并缩短了搜索过程。

A rough and refined two level pole position search method was implemented to identify the rotor magnetic pole position according to the readout of an incremental encoder , and hall sensors .

提出了一种应用DSP实现数控机床永磁交流伺服系统电机的转子磁极位置和转速的检测方法，该方法充分利用了DSP片内资源，无需增加额外的硬件资源，降低了系统成本。

In this paper , a method of PMSM 's rotor position and speed detection based on DSP is presented , and this method make full use of the resource of DSP .

地球磁场多次发生南北（正负）磁极位置的变换和白垩纪超静磁带（CNS）的异常现象，这已为大家所公认。

It is generally acknowledged that geomagnetic polarity has reversed many times in geological history and an abnormal geologic phenomenon is the Cretaceous normal superchron ( CNS ) .

二维Cu-O面中的铁磁极化子

Ferromagnetic Polaron in the Two - dimensional Cu-O Plane

首先介绍Zooming算法的基本原理，然后以该算法对永磁起动机进行磁极优化设计，取得较为满意的结果。

We present its basic principles and get the best result in the optimistic design of the permanent magnet starter motor with auxiliary pole .

系统采用电流、速度双闭环控制，电流、速度的调节采用PI调节，转子磁极位置通过霍尔元件检测。

The double close loops of speed and current control is introduced in the system and the PI control is implemented in the current and speed loop , the position of rotor pole is detected by hall element .

描述了合肥国家同步辐射实验室（NSRL）光学速调管色散段磁极间隙调节系统的原理和结构。

The principle and construction of magnetic pole gap adjusting system of transverse optical klystron dispersive section based on PC is described in this paper .

算例选择制动力矩计算模型中的磁极数N、内半径r1及外半径r2为可控因素，制动力矩波动率作为质量特性输出值。

The number of magnetic poles N , inner radius r_1 and outer radius r_2 are chosen as controllable factors in braking torque computing model . Braking torque fluctuation is chosen for the performance characteristic values .

与地磁测量结果进行对比显示，利用K-Ar法与地磁学共同研究第三纪地磁极性事件是可行的。

After comparing K-Ar results with magnetic investigation , it can be found that it is feasible to study Tertiary geomagnetic events through K-Ar dating and terrestrial magnetism .

利用北京怀柔太阳观测站的矢量磁向仪在1988-1996年期间观测的286个偶极活动区，探讨了磁极轴的倾斜角和磁场缠绕参数h‖之间的符号关系。

Active regions in which bipolar magnetic fields are dominant , were chosen from data set of photospheric vector magnetograms observed at Huairou Solar Observing Station in Beijing during 1988-1996 . The relationship in sign between tilt angles of magnetic polarity axis and mean twist parameters h ‖ were explored .

并应用ANSYS有限元分析软件分别仿真、计算了单个大磁极、单侧阵列式磁极和对称阵列式磁极探测磁芯的磁力线、磁感应强度值、磁通量、电感以及杂质的损耗。

This paper respectively simulated and computed magnetic line , magnetic induction value , magnetic flux , inductance and impurity loss of detecting magnetic cores of a big magnetic pole , unilateral array magnetic poles and symmetry array magnetic poles by finite element analysis soft ANSYS .

为提高POISSON模拟计算的效率，POIS-SON输入文件中有关线圈电流和位置、磁极形状的输入和调整由程序自动完成。

With the two codes , the efficiency of POISSON simulations is improved and the mistakes which might occur in writing and adjusting the POISSON input file manually could be avoided .

当磁感应强度与场强梯度乘积的最大值减小为101T2/m（磁极间距为4mm）时，氧气的富集量降至0.23%。

When the maximum product of magnetic flux density and field intensity gradient drops to 101T ~ 2 / m ( the distance between two magnetic poles being 4mm ), the enrichment degree drops to 0.23 % .

在利用HL-5霍尔效应测试仪测量磁场的实验中，发现有些仪器的测量曲线在磁极边缘附近存在畸变。

Magnetic field curve distortion is found at the position of magnetic pole edge in Hall effect experiment , using HL-5 Hall effect testing instrument .

本文介绍三峡水轮发电机磁极与传统结构磁极的不同点，并重点介绍ALSTOM公司在三峡发电机中采用的无磁极压板结构的磁极、齿形磁极键等新结构的设计特点及其优点。

This paper introduces the main design differences between the poles of Three Gorges Generator and the traditional one and as well the structures and the merits of the pole without press plate , chain wedge etc which are the new structures used in Three Gorges Generator by ALSTOM Power Ltd.

为减小边缘场效应，大型固定磁场交变梯度（FFAG）磁铁的磁场分布由修整线圈和磁极形状两者共同来实现。

In order to decrease the edge effect of the field , the designed magnetic field distribution in a large-scale FFAG magnet is realized by both the trim coil and the shape of the magnet pole-face .

目前主要存在两种观点：一种为由载流子诱导的铁磁交换耦合，如RKKY、双交换作用。另一种是与样品中的缺陷有关的束缚磁极化子模型。

There are currently two theories to explain the observed ferromagnetism : One is the ferromagnetic exchange coupling mediated by carriers , such as RKKY and double exchange models ; the other is the bound magnetic polaron ( BMP ) model , which is related to the defects in materials .

用旋转磁极的方法对内孔和球面进行磁性磨料研磨加工的研究

Magnetic Abrasive Machining for Hole and Ball with Rotating Magnetic Pole

提高长磁极铁芯刚度的新结构

A New Construction of Raising the Rigidity of Long Pole Core

牙形石的三个繁盛期与古地磁极性倒转有关。

Three prosperous periods of conodont have relation to Palaeomagnetism Reversal .