环电流

Moreover, it reduces the load turbulence action due to current feed-forward.

此外，电流前馈环的使用提高抗负载扰动的性能。

The control of the lead angle of the motor is studied. The power MOSFETs are used as a power amplifier which adopts a half-bridge circuit.

本文设计了变磁阻电机三相绕组的电流闭环控制系统，并研究了超前角控制问题。

When the system is at work, IF output power is achieved through adjusting inverter trigger angular frequency, which can always make the power out put be in the biggest state . Through the effect of the voltage and current closed-loop ,IF power achieve constant power output.

由于系统在工作时，中频电源的输出功率是通过调节逆变触发角频率来实现的，这样就可以始终使输出的功率处于给定的最大状态，并且通过电压和电流闭环作用，使中频电源达到恒功率输出。

Two types of assumed disturbances are considered:(1) the perturbed field is almost uniform in the direction antiparallel with the dipole's axis,(2) the perturbed field is originated from a ring current situated between 5 to 8 earth radii on the equatorial plane.

地磁扰动我們分別取以下两种形式：(1)当扰动磁場是均勻的而且其方向与磁軸相反；(2)当扰动磁場是由位于赤道面上5至8个地球半径的电流环引起的。

The following studies have been done:① According to the technological requirements of CO2 shielded arc welding machine, a set of control system for are-welding inverter power supply is developed.

根据熔化极CO2焊机具有燃弧和短路两种工作状态，且两种状态下控制目标不同的特点，在控制系统中设计了双闭环反馈：焊接电压反馈及焊接电流变化率di/dt反馈。

Acceleration mechanism of a compact toroid is analyzed in detail,and the CT speedup process is described by a set of radiation magneto-hydrodynamics equations in this paper.

1引言紧凑等离子体环是一种环形等离子体构形，由其内部电流所产的径向磁场和环向磁场约束，如图1所示。

The use of temperature control through the transformation of the main pressure control for variable frequency control Shop for closed-loop motor pumps, water pumps, electric power saving rate of the average at more than 30%; 90KW chilled water pump motor current by adjusting the valve at the changes between the 163-148A, the average section less than 6% of electricity by the transformation of the closed-loop control of VVVF, the saving rate is more than 30%.

通过改造采用温度控制为主，压力控制为铺进行闭环变频控制水泵电机，水泵电机平均节电率都在30％以上；90KW冷冻水泵电机靠调节阀门电流在163—148A之间变化，平均节电不足6％，经闭环控制变频调速改造后，节电率平均也在30％以上。

The short-circuit current in some parts of Shanghai Power Grid that is the receiving end of East China Power Grid exceeds limits, which forces the structure and the operation modes of the 500 kV grid to make some adjustment, and the 500 kV double-loop-network is compelled to uncouple in certain conditions.

作为华东电网的受端的上海邵分厂站500 kV短路电流的超标，迫使500 kV电网结构或运行方式做出相应调整，500 kV双环网在一定情况下被迫解环。

While there are the same material properties, shapes and similar boundary conditions, the field distribution of the former can be solved analogically by the later one.

密绕线匝的铁氧体电感器磁场强度H可认为仅有环向分量，若选择H为自由度，则成轴对称场分布；加载环向电流的电感器选择矢量磁位A为自由度时也呈轴对称分布，该文推导了这两类磁场在各自自由度下满足的微分方程。

According to the analysis of relations between optical power,center wavelength,sensing fiber Verdet constant,and Fiber Optic Current Transformerscale factor,it was demonstrated that the center wavelength excursion generated by power attenuation of SLD was the prime reason of FOCT scale factor error.

通过分析光源功率、中心波长、传感光纤Verdet常量，以及闭环光纤电流互感器变比之间的关系，结合测试数据，证明了中心波长漂移是光源功率衰减引起闭环互感器变比变化的主要原因。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了