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When a rotating voltage vector is injected to the motor at standstill, there is a microinching when the voltage phase is line to the direct axis of the motor. Then the current will decrease due to the back electromotive force. The initial mover position is identified by this change.

电压相位和电机直轴重合时,产生的电磁推力超过负载阻力,电机有一微动,由于反电势的作用电流就会降低,通过检测电流矢量的变化来估计动子的初始位置。

In recent years, high voltage direct current system is rapidly developed, but harmonic pollution is produced and becomes badly, harmonic measurement by true is the precondition and sticking point of restraining harmonic.

近些年来,高压直流输电得到了快速的发展,电网的谐波污染也日趋严重,实时、准确地测量谐波电流信号是有效抑制谐波电流的前提与关键。

The bridge loses balance and sensitive parts have a output signal,which will transform to related current signal after differential magnifying and conversion between current and voltage. Linear 4~20mADC standard signal is formed by compensation of magnifying and non-linear rectified ring circuit ,and second temperature compensation.

输出的电信号,经过差分放大,电压电流转换,变换成相应的电流信号,通过放大和非线性矫正环路的补偿,以及精密的二次温度补偿,产生与输入压力输成线性关系的4~20mADC 二次制标准信号。

Furthermore, this experiment, if interpreted in the old language, gives us no hint at all as to whether an induced current can be excited by the motion of another circuit carrying a current, instead of by motion of a bar magnet.

但是根据场论的观点看来,一个电流表示有一个电场的存在,这个电场迫使电流体在导线中流动。当磁棒再静止时,电流便消失了,电场也同样消失了。

This method was based on rotation formula of the current magnetic field and the magnetic fields can be expressed by a double integration about spatial radial coordinate and spatial wave number of Bessel function.

电流磁场的旋度公式出发,推导了多层介质中点电流源磁场的表达式,其为一个关于空间径向坐标和贝塞尔函数空间波数的二重积分。

The natural chromaticity is obtained by detecting the variation of the betatron tune with the main dipole field strength.

采用改变二极铁电流方法测量了自然色品和采用改变RF频率方法测量了校正色品,并对这 2种测量方法进行了理论分析和公式推导,还给出了自然色品、校正色品以及六极铁电流对校正色品影响的测量结

We observe gate current by biasing the gate at fixed voltage and gate direct tunneling current will show two or three levels. The cause is carriers trapping in the trap site during tunneling through gate dielectrics and detrapping by thermal emission.

透过给一固定的闸极电压观察闸极电流,闸极直接穿隧电流会在多个层次间振动,其原因来自於电荷在穿越闸极层时,会掉进闸极层里面的缺陷并被抓住,但又容易藉著热从缺陷中散逸。

In this paper, by supposing the currents on the two lines are equal but opposite and with the application of bifilar transmission-line theory, the current-voltage relationships of the asymmetrical bifilar even transmission line are obtained.

该文在假设双线传输线两线上电流大小相等、方向相反的条件下,运用双线传输线理论思想,推得不对称双线均匀传输线的电压、电流关系。

A design method of switched-currentladder filters using the bilinear transformation is proposed.

开关电流梯形滤波器的双线性变换设计孟相如,邱关源(西安交通大学电气系,西安710049)本文提出了一种用双线性变换进行开关电流梯形滤波器设计的方法。

The magnetic field in the cell was calculated on the basis of Biot-Savart's law and improved—equal—effective—magnetic dipole method, and the computer program was much improved on previous work.

根据欧姆定律和基尔霍夫定律,用有限差分法导出了求解铝电解槽内三维电流分布的数学模型,编制了计算程序,在国内首次较准确地计算了铝电解槽内三维电流分布。

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