There are three reasons for this : first , after being crashed , the shape is not regular without definite strength . secondly , we do not know the magnetic pole . thirdly , the magnet taken from speaker is used specially for industry , and there are some harmful radiations in it possibly 形状不规整，不知道其强度有多大， 2不了解其磁极3广播喇叭磁块属于工业用磁，可能含有一些对人体有害的放射体。
During the winding of magnetic pole coils used in synchronous electric motors , cold hardening is induced by press bending at 90 , by which the coils are hard to be pressed and shaped , thus local resistivity increases and results in influence on the coil lifetime 摘要同步电动机磁极线圈在编绕加工时， 90角处因压弯而产生的冷作硬化现象使线圈无法装压成型，且局部电阻率增大，甚至影响磁极线圈使用寿命。
The influence on the electromagnetic parameters , by the change of air ply , permanment magnet length and the magnetic pole arc coefficient , are calculated by the ansys software . the optimum parameter of the magnetic pole is obtained by solving the magnetic field 运用有限元分析软件ansys分析了通过改变电机极弧系数、磁钢厚度和气隙厚度对电机磁场的影响,以电机性能和磁钢利用率为目标对这些参数进行了优化。
When electrons move in spirals around magnetic lines of force , radio waves are produced and radiated out along the two magnetic poles of the star . usually , the rotational axis of the neutron star does not align with the magnetic axis . the radiation beams will sweep around and create the 通常恒星的自转轴和磁轴并不一致，中子星亦不例外，所以沿著磁轴向外发射的无线电波束，在中子星自转的带动下，便会如灯塔般向宇宙扫射，这便是著名的
The magnetizer we made can be used for different magnetic material to be magnetized . the 4 - 8 magnetic pole can be magnetized at same time using various design of magnetizer head , and the parameters of br , hc and bh can reach the ideal value . copyright2004 all rights reserved 本公司制造的充磁机，可用于各种不同磁性材料原形磁体的充磁,采用不同设计的充磁头可实现4 - 8个磁极的充磁，使充磁体的剩磁矫顽力磁能积等磁性参数达到理想状态。
A non - contact drive and control method on capsule type micro robot was proposed , in which exterior permanent magnet driver was composed of multiple tegular magnetic poles magnetized in radial direction , while interior permanent magnet driver built in robot was in the same structure as exterior one 摘要提出一种以径向磁化的瓦状多磁极组成的圆筒式永磁体为外驱动器，以嵌入机器人本体内与外驱动器同磁极结构的永磁体为内驱动器的非接触式驱动控制方案。
It is tested that the most proficiency method is using pulse - controlled magnet core to generate rotating magnetic field , in which the density and frequency of rotating field can be adjusted , the different form of rotating field can be easily achieved , and both magnetic pole and work piece need not rotate during the magnetic abrasive finishing process 实践证明，最有效的方法是脉冲控制电磁线圈的方法产生。这种类型旋转磁场的强度和磁场的旋转频率都可以得到调节，磁场的不同旋转形式也很容易实现，而且在研磨加工过程中工件和磁极都无需旋转。
The last part concludes that mr dampers is one of the very attractive control elements in semi - active control . as one of mixed model mr dampers , armature piston ' s mr dampers have principle designs good function and better practical value , it ' s worth to popularize use . about the armature piston ' s mr damper ' s designs , the space of work , the diameter of wok and the length of magnetic pole have obvious affects to the force of mr dampers , mr fluid materials should be paid attention , input electric current affects mr dampers greatly the high current increases the damping force , the effect of reduce vibration increase obviously , 最后，论文给出了结伦：磁流变液阻尼器是半主动控制装置中非常吸引人的控制元件之一，混合工作模式的磁流变阻尼器结构简单，阻尼效果比流动模式和剪切模式均要好，是一种比较理想的磁流变阻尼器；电枢活塞式磁流变阻尼器作为混合模式磁流变阻尼器的一种结构形式，其结构设计合理，性能良好，具有较强的实用价值，值得在工程中推广应用；在电枢活塞式磁流变阻尼器的设计中，应特别注意工作间隙h 、工作直径d 、磁极长度卜都对阻尼器的阻尼力有明显的影响，并注意选用合适的磁流变液材料；输入电流对磁流变阻尼器的阻尼效果影响很大，输入大电流时阻尼力明显增大，减振效果明显提高。
Firstly , considering the molecular pump is small and the elimination of heat condition is bad , this paper presents the structure of the mb , including the material of the rotor and stator , the number of magnetic poles , the stator slot shape of mb , the layout of the magnetic poles , the coins winding and so on 首先综合考虑了分子泵体积小、磁轴承散热条件不好的特点,设计了分子泵磁悬浮轴承的结构,选择了轴承铁芯的材料,设计了磁极的布置、槽的形状、磁极数目和线圈缠绕方式。
Thereafter mathematical model on magnetic tensile force along axial direction was established based on magnetic charge integral calculus by equivalent magnetic charge theory , by which characteristics and relationship among structural parameters of magnetic poles and magnetic tensile force , as well as effect on the swimming characteristic of the robot by magnetic tensile force , were calculated and experimented 基于等效磁荷理论，采用磁荷积分法建立了驱动器的轴向磁拉力模型，对驱动器磁极结构参数与磁拉力的关系特性以及磁拉力与机器人游动关系特性进行了理论与试验研究。
