Therefore, the magnetomotive force in the air gap is essentially proportional to the primary ampereturns squared . 所以，气隙中的磁动势实际上与初级安匝数的平方成正比。
2.
Armature magnetomotive force 电枢磁动势
3.
Through cell ammeter and armature magnetomotive force , we qualitativly analyze that harmonic magnetiv field has influence on motor operating performance , it can ensure whether slot coordination suits well or not 通过槽电流表和槽磁动势图定性地分析电机的谐波磁场对电机运行性能的影响，由此确定电机所选槽配合是否合适。
4.
A three layered magneto - electro - elastic half - space subjected to vertical mechanical loads , charge or magnetomotive force is analyzed as the numerical example , and the calculative results of two different stacking sequences are compared 以在垂直机械载荷或电载荷或磁感应强度作用下三层半无限压电压磁弹性体为算例，并比较了两种不同材料叠放顺序的计算结果。
5.
Powerformer have some changes in constract with the conventional generator ， subsequently it also have some new problems in order to have an economical ， efficient ， credible development and application the structure and the philosophy of electromagnetism of powerformer will be on speaking terms changes electrical design ， magnetism design ， thermal design and structural design are have some new changes above all ， the electromagnetism parameter and the harmonic magnetomotive force of powerformer are studied in this paper first ， it mainly utilizes analytics to deduce formula of slot leakage reactance it considers three instances ， including monolayer - slot ， multilayer isometric - slot and multilayer anisometric - slot then ， the analytics and the fem are utilized to calculate slot leakage reactance of stator winding of prototype of powerformer and compare their results second ， the theory of utilitzing fem to calculate the reactance of powerformer is simply introduced ， including stable reactance ， transient and subtransient reactance specially ， the saturated influence of the stable reactance is considered then ， the results are analysed final ， it mainly introduces the influence of harmonic magnetomotive force of stator winding and analyses the harmonic magnetomotive force of stator winding then ， it mainly analyse harmonic magneto - motive force of stator winding through arranging various arrays of stator winding and observe their influence 基于上述原因，本文对powerformer的电磁参数以及定子绕组谐波磁势进行了研究。首先是用解析法推导出powerformer定子绕组槽漏抗的计算公式，考虑了单层圆形半闭口槽、多层等半径圆形半闭口槽和多层不等半径圆形半闭口槽三种情况，并对powerformer样机的定子绕组槽漏抗用解析法和有限元法进行了计算，并比较其结果；其次，简要介绍了有限元法计算powerformer电抗参数的原理，包括稳态电抗、瞬态电抗和超瞬态电抗，对稳态电抗考虑饱和影响，对结果进行分析；最后，介绍定子绕组谐波磁势对电机运行性能的影响并对定子绕组谐波磁势进行了分析。然后通过对定子绕组进行不同排列来分析定子绕组谐波磁势，看看绕组排列对谐波磁势的影响。
6.
This paper theoretically analyses the armature current and magnetomotive force in ac exciter of brushless synchronous machine with rotating rectifier . under the normal or fault conditions of rotating rectifier , the mathematical expressions of the armature current , the m . m . f and induced electromotive force are approached 本文通过对旋转整流器在正常与故障状态下的交流励磁机电枢电流和电枢电势作了初步的理论分析，推导出旋转整流器在正常与故障状态下电枢电流、空间谐波合成磁势及其感应电势的数学表达式。
7.
Secondly , according to the character of this kind of harmonic , the solutions of power filter are deeply analyzed and an optimized topology for series connected hybrid power filter is obtained . by pwm technique , midfrequency transformer and the principle of the magnetomotive force ( mmf ) compensation , the problem to the transfer of the low - frequency harmonic power compensatory signal in the series apf is solved , in technique 其次，针对acem系统特有的“电源谐波”特性，深入分析了滤波器方案，得到了一种适用于acem系统谐波抑制的串联混合型有源电力滤波器优化拓扑结构，并采用了pwm调制技术、中频注入变压器和磁势补偿原理有效地解决了串联apf中低频谐波功率补偿信号传输的难题。
