磁动势

The centimeter-gram-second electromagnetic unit of magnetomotive force, equal to!

吉伯厘米－克－秒磁动势电磁单位，等于！

In the other words, the influences of the winding's current cannot be think about by simply add these influence elements of these windings, the inductance of every winding becomes a complex equation which connected with the currents of all the windings and the permanent magnetic magnetic-force.

永磁磁动势的大小不变，但是转子位置改变时，对各相绕组的轴线的磁通路来说，永磁磁动势的作用便不一样，因此永磁磁动势的影响可以用电感与转角有关来描述。

The magnetic field of motor and the eddy current loss in PM are both solved based on FEM for three-dimensional electric magnetic field.

通常在永磁同步电机中都认为转子损耗是可以忽略不计的，主要是因为转子是同步于定子磁动势旋转的。

It is harmful to the characteristics of the transformers on line. It causes the increasing of magnetizing current, harmonics leakage magnetic flux, and thus the losses, which in turn results in the structures overheating and insulation ageing.

电力变压器的磁动势和磁通出现直流分量的现象称为"直流偏磁"，这一现象将对变压器的正常运行产生不利的影响，诸如励磁电流有效值、高次谐波成分及其相应损耗的增加，铁心高度饱和引起的漏磁通的增加，以及由此引发的局部过热、绝缘老化等问题。

The main contents of this subject is the basic theory of the windings, including the calculation of the electric potential and magnetomotive force and polarity of the winding\current and voltage.

本课题内容有绕组的基本理论，概述了交流绕组的电动势、磁动势等的计算以及绕组线圈、电流、电压的极性，这些为讲述绕组分析方法时提供了基础。

The paper carried on the theoretical analysis, the computation of the air gap magnetomotive force, the electromagnetism torque and MMF decoupling parameter k.

对六相电机气隙磁动势、电磁转矩和磁势解耦参数k进行了理论分析和计算，并通过实验进行验证。

A set of equivalent three-phase windings was established based on the same magnetomotive force and power. A dual three-phase PMSM was substituted equivalently by a three-phase PMSM after a winding transformation.

基于产生相同磁动势和功率不变的原则，构建了一个等效的三相绕组，绕组变换后，原双三相永磁同步电动机等效为普通的三相永磁同步电动机。

Considering the state of open-phase and asynchronous operation in largepower unit, the magnetomotive force and harmonic current of stator and rotor aretheoretically analyzed. A fault simulation test is designed, which proves the theoreticalconclusion correct. Finally, in this thesis, the problems with open-phase protection andbreaker failure protection are discussed, and the improved scheme of protection ispresented.

对发电机组非全相异步电动运行状态下，定子绕组与转子绕组磁动势以及谐波电流进行了详细的研究，通过磁动势的矢量分解等方法，得出了电枢绕组电流不对称时磁动势的空间分布，推导出了各次谐波电流在定子绕组、转子绕组及相互间的感应关系；通过试验验证了理论分析结果的正确性。

The speed-sensorless vector control and the identification of motor parameters in this paper are the two novel research of vector control.Using asynchronous machine's mathematic model in three-phase static reference frame, this paper has derived it's mathematic model in two-phase static reference frameand in two-phase rotating reference frame, and got the coordinate transformance formulus based on the constant magnetic force and power force, by compared different field orientation methods, we can find that field orientation at rotor field can realize the decoupling of the stator current flux component

无速度传感器矢量控制和电机参数辨识是矢量控制的两个新的研究方向，本文利用异步电机在三相静止坐标系下的数学模型推导出两相静止坐标系、两相同步旋转坐标系下的数学模型，根据磁动势守恒和功率守恒的原则，得出各坐标变换公式；通过不同磁场定向方式的比较发现，异步电机按转子磁场定向时定子电流励磁分量和转矩分量可以比较方便地实现解耦。

This paper presents MMF of a five-phase induction motor with concentrated and full-pitch windings by means of fourier analysis and winding function , which indicates theoretically that the five-phase induction motor with concentrated and full-pitch windings can provide more electromagnetic torque and higher torque density than others.

本文运用傅里叶分析和绕组函数的方法，推导了集中整距绕组五相感应电动机的磁动势，得出集中整距绕组五相感应电机能更好地增加电机的电磁转矩、提高转矩密度。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。