Now, I know that you guys are not necessarily fond of computing flux of vector fieldS for surfaces so maybe you don't really see the point.
好吧，我知道你们其实不喜欢，计算一个向量场中曲面的通量，所以你们可能不知道我为什么要这么做。
So, the divergence theorem gives us a way to compute the flux of a vector field for a closed surface.
散度定理为我们提供了一种，计算向量场通过闭曲面的通量的方法。
Maxwell's equations conserve certain properties-the magnetic field intensity, the electric displacement field and the Poynting vector that describes the electric flux of an electromagnetic field.
麦克斯韦方程中有某些特性是恒定不变的——磁场强度、电位移场以及描述电磁场电通量的坡印廷矢量。
It is a vector field in some of the flux things and so on.
也可以是一个向量场的通量，等等。
So, we need to set up the flux integral for a vector field dot ndS.
需要建立向量场点乘nds的通量积分。
I'm going to prove that the flux of a vector field that has only a z component is actually equal to the triple integral of, RzdV well, the divergence of this is just R sub z dV.
我将要证明，一个只有z分量的向量场的通量,等于一个三重积分，其中被积表达式为。
S if we have a closed surface with a normal vector pointing outwards, and we want to find a flux integral for it, well, we can replace that with a triple integral.
的法向量似乎是指向外部。，And, the,normal, vector, to,s, seems, to, be, pointing, out wards, everywhere。，如果我们有一个法向量指向外部的封闭曲面，并且我们要求出它的一个通量积分，那么我们可以用一个三重积分来代替这个通量积分。
But the usually traditional settings would be to take your normal vector pointing maybe out of the solid region because then you will be looking at flux that is coming out of that region of space.
但通常的习惯是,把立体区域上的外法向量规定为其定向,因为这么做之后，当你观察通量时会发现,它是从区域内部向外流动的。
But it could be that, well, imagine that my vector field accidentally goes in the opposite direction then this part of the curve, while things are flowing to the left, contributes negatively to flux.
的确有可能出现往两个方向流动的情况，可以想象到，这一小部分往相反方向流动，当流体向左流时，就只能算作负值了。
One is the vector field whose flux you are taking.
一个是要取通量的向量场。
Now, if you wanted the unit normal vector to compute flux, then you would just scale this guy down to unit length, OK?
如果想用单位法向量来计算通量，还得先把它标准化到单位长度？
In particular, an easy case where you know you can get away without computing anything is, of course, if your vector field is tangent to the surface because then you know that there is no flux.
特别地，有一种简单的情况，是不用计算的，当向量场与曲面相切，没有通量。
This paper obtains a new speed-sensorless direct torque control scheme for induction motor based on calculating the stator flux vector increment to determine the stator reference voltage.
在直接转矩控制理论基础上，推导出一种基于定子磁链矢量增量来确定定子参考电压矢量的新型无速度传感器直接转矩控制方案。
So, that means that the double integral for flux through the top of R vector field dot ndS becomes double integral of the top of R dxdy.
这就是说通量的二重积分,顶部R•ndS的二重积分,变成了Rdxdy的二重积分。
Then a voltage vector control scheme for induction motors based on constant stator flux is presented and it's nonlinear limitations are analyzed.
结合定子磁链控制，提出异步电机基于定子磁链幅值恒定的电压矢量控制方案，并对该方案的非线性局限进行了分析。
Finally, simulating experiment for the whole system is carried through with the stator flux-oriented vector strategy and control arithmetic of rotor speed perturb and power observation.
最后本文采用定子磁场定向的矢量控制策略，结合转速扰动功率观测的控制算法对转子侧进行了仿真验证。
This paper analogy the selection of voltage space vector and the flux linkage estimate model of the direct torque control system of PMSM, and the realizing project of the system.
文章分析了永磁同步电机直接转矩控制系统的电压空间矢量选择和磁链估计模型，并提出了系统的实现方案。
In vector control of induction motor, the key problem is to estimate rotor flux accurately.
异步电机矢量控制的关键问题在于精确地估计转子磁链。
The adaptive flux controller and speed controller based on neuron are presented for the induction motor vector control.
提出了基于神经元的用于感应电机矢量控制的自适应磁链和转速控制器。
Based on the analysis of control strategy of the system, this paper used respectively voltage oriented and stator flux oriented vector control in grid side and rotor side of the converter.
在分析了该系统控制方法的基础上，建立了交直交变频器网侧电压定向以及转子侧定子磁场定向的矢量控制系统模型。
To solve these problems, a modified method is presented, which subdivides the voltage vector sectors and switching signal selection table, and optimized stator flux compensating voltage.
针对上述问题，给出了一种通过细化电压矢量合成扇区和开关信号选择表，优化定子磁链补偿电压的改进方法。
The measurement and observation of flux in induction motor is a key problem in vector control system.
异步电功机的磁通检测和观测是矢量控制系统中的关键问题。
This paper discusses the locus of flux linkage under soft-switching PWM pattern by using space voltage vector in detail.
该文利用空间电压矢量概念，深入分析了软开关pwm模式下磁链的运动轨迹。
It directly controls the electromagnetic torque and stator flux, using the analyzing method of space vector and stator flux orientation.
它采用空间矢量的分析方法，采用定子磁场定向，直接对电动机的电磁转矩和定子磁链进行控制。
This method is compared to the well-known direct field-oriented control (FOC) and stator flux vector control (SFVC) methods.
将该方法和著名的直接磁场定向控制(FOC)和定子磁通矢量控制(SFVC)进行比较。
According to the characteristics of brushless doubly-fed wind turbine and adopting flux linkage oriented vector transformation control technology, a new type of power control system is developed.
根据无刷双馈电机的特性，采用磁链定向的矢量变换控制技术设计了一种新型功率控制系统。
It sums up the definition, general expressing formula and general calculating method of flux in any vector field by analyzing the flux in the speed field, electric field and magnetic field of fluid.
文章通过对流体的速度场、电场和磁场中通量的解析，总结出了任意的矢量场通量的定义、一般表达式及一般计算方法。
The axial dispersion in chromatography models was discussed with vector method and the effect of diffusion on the bulk flow flux with its partial quantity form was pointed too.
用矢量方法讨论了色谱模型中的轴向扩散项，指出轴向扩散项是扩散通量以分量的形式在主体流动通量上的页献。
The fuzzy controllers were used to replace PID torque adjustor and PID flux adjustor of VVVF vector control system.
用模糊控制器代替VVVF矢量控制系统的PID转矩调节器和PID磁链调节器。
Simulations show that the proposed observer can track rotor flux vector in a large speed range and be robust to the variable rotor time constant.
仿真结果表明该转子磁链观测器可以在较大速度范围内跟踪转子磁链矢量的变化，同时对变化较大的转子时间常数具有一定的鲁棒性。
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