Pm flux switching machines contain the merits of both switched reluctance machine and pm machine , such as the simple structure , high torque density and efficiency , as well as the flux - weakening capability 摘要永磁开关磁链电机兼具开关磁阻电机和永磁无刷电机的优点，结构简单、转矩和能量密度大、效率高，而且具有良好的弱磁能力。
However , in the case of the mri , the magnetism of a very high gauss level is radiated to the human body . the magnetic energy causes a resonance phenomenon with the hydrogen that is contained in the moisture within the body 它们都利用磁能量，不过mri是用高强度磁场发射到人体中，使磁能量与体内水份中的氢产生共振，然后把共振的现象制作成影像。
The optimum condition in hydrogen desorption pressure is p = 800 - 100000pa . comparing the magnets prepared by traditional ball milling process , the magnets prepared by hydrogen desorption have lower residual magnetization and maximum magnetic energy product 最佳的脱氢气压在800 - 100000pa之间hd法制备的烧结ndfeb永磁体的剩磁和最大磁能积比传统bm工艺稍低。
Its a high performance , low temperature coefficient permanent magnet with its high working temperature350 degree centigrade . when working above 180 degree centigrade , its maximum energy product bh and steady temperature are superior than ndfeb magnetic materials 是由钐钴和其它金属稀土材料经配比，溶炼成合金，经粉碎压型烧结后制成的一种磁性材料，具有高磁能积极低的温度系数，最高工作温度可达
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。
Permanent magnet synchronous motors ( pmsm ) have high magnetic energy product . in the same volume , it can be smaller and lighter than asynchronous motor . in addition , it has stiff mechanical character and small rotor moment of inertia , so it is often used as servo motor under the condition of high torque response and high performance 永磁同步电动机具有较高的磁能积，相同容量下可以做到比异步电动机体积更小、重量更轻，而且由于机械特性硬、转子转动惯量小，很适合作为伺服电机，用于高转矩响应、高性能要求的场合。
By successful solution of non - linear magnetic fields and revision of the program , we can reach following conclusions : in the computation of nonlinear magnetic fields , if iteration method is used , under - relaxation is necessary when amending the permeability distribution in soft magnetic materials ; and when < wp = 5 > calculating the equivalent current density in permanent magnets , under - relaxation is not a necessity ; when searching for permeability values by interpolation method on the demagnetization curve of soft magnetic materials , if a fixed saturation point is set , around this point an abrupt change of permeability values will be obtained ; this sudden change may cause a little problem in the smoothness of magnetic field distribution ; because the magnetic circuits of microwave tubes are too complicated , in the author ' s view , to describe the working state of a magnet system , the working points of magnets can not do it properly but average energy production of magnets will serve ; as to indicate the quality of a magnet system design for microwave tubes , the efficiency of magnetic energy utilization will be a very good criterion 由此得出结论，在非线性磁场计算中：采用迭代法的情况下，在各迭代循环之间进行磁导率修正时，一个欠松弛迭代过程是必需的；对永磁体中的等效电流修正时可以不作欠松弛迭代；在纯铁的磁化曲线上指定某一个固定的磁感应强度为磁饱和值，会使得插值求出的磁导率在该磁饱和值附近有一突变,这一突变对计算结果中磁场分布变化的光滑性稍有影响。在微波管磁系统设计中，由于微波管磁路比较复杂，作者认为磁体的工作点并不能很好地反映磁体的工作状态，而采用平均磁能积为衡量磁体工作状态的标准更加符合微波管磁系统的实际情况；要表示磁系统设计好坏的程度，则用磁能利用的效率为标准更好。
According to study on magnetic parameters of the bounded ndfeb magnets : coercive force ( hc ) , residual magnetism intensity ( br ) , ( bh ) max . the residual magnetism intensity ( br ) and ( bh ) max of the bounded ndfeb magnets have not been evidently changed between that of cladded and non - cladded ndfeb magnetic powders 能够改善ndfeb磁体的导电性能的目的。浙江工业大学硕士学位论文包覆前后的粘接ndfeb磁体的矫顽力有不同程度地降低;而最大磁能积和剩余磁感应强度却变化不大。
Analyses showed that the effect of heat treatment is remarkable to 304 stainless steel fibers . and a new martensitic phases formed , and ms increased during annealing at 180c ; annealing above 180c decreased the ms . after annealed in the range of 380c ~ 440 c , the he increased and the product ( mr hc ) improved . it was also shown that annealing affected the mechanical properties of 316l ss fibers obviously 304不锈钢纤维在180附近退火处理其ms略增加，其内部相变与一般的304不锈钢体材料存在差别； 380 440区间退火处理，其矫顽力急剧增加、磁能积参数配合比较好；退火热处理对316l不锈钢纤维的力学性能作用明显。
