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The controller estimates a three-phase motor current value by using a current detection value detected by the current sensor and a rotor rotation position, and controls the inverter by using on the motor current estimation value.

这里,用电流传感器检测出的电流检测值和转子旋转位置推定3相的电动机电流值,用该电动机电流推定值控制逆变器。

It analyzes the principles of technology which consists of ip-iq harmonic current detecting method based on the instantaneous reactive power theory and the hysteretic control of compensating current method.

分析了基于瞬时无功功率理论的ip-iq谐波电流检测技术和电流滞环比较控制的补偿电流技术。

As the current and voltage have the same basic frequency, the unit voltage Park vector and its conjugate are used to rotate the current Park vector. During the course of rotation, the fundamental positive sequence component in the current Park vector can be filtered out but the others remain.

利用电压与电流基波频率相等,用单位电压Park矢量及其共轭对电流Park矢量进行旋转变换,从而将电流Park矢量的基波正序分量完全滤除而不影响其他的谐波分量。

In the simulation, the flow rule of melt metal in mold of horizontal continuous casting with electromagnetic stirring is measured using ultrasonic Doppler velometer, and the result is inter confirmed with the solidification characteristics is tics of zinc cupronickel thin slab in industrial product, some advantageous results are obtained that, when the current is 400 A the inner micro-pores disappear, when the current is 500 A the center equiaxed crystal layers occur and when the current is to 800 A the inner-segregation decreases to zero.

在模拟实验中,用超声波多普勒测速仪测量该电磁搅拌下水平连铸结晶器内金属液的流动规律,并与生产实验中锌白铜板带的凝固特征相互印证,发现搅拌电流达到400 A时,板带内部气孔消失,电流达到500 A时板带出现等轴晶带,电流达到800 A时板带坯偏析率趋于零。

Electromagnetics course mainly including basic phenomena and laws of electro- magnetics, electrostatic field in vacuum, in conductor and in electric medium, electric energy, stabilized current, stabilized magnetic field and its basic laws, electric and magnetic fields caused by a moving chager in lower speed, the transform of electric and magnetic fields between different systems of coordinates, inductive laws, eddy field, self inductance, mutual inductance and transient, molecule current and magnetic substance, ferromagnet, boundary conditions, magnetic circuit theorem, energy of magnetic field and density of magnetic energy, displacement current, Maxwell's equation, electromagnetic wave, Poynting vector.

电磁学课程的主要内容包括:静电的基本现象和基本定律,真空中的静电场,导体和电介质中的静电场,电场的能量与电场能量密度,稳恒电流,稳恒电流磁场的基本定律,运动电荷的电磁场,不同参照系之间电磁场的变换,电磁感应定律,涡旋电场,互感,自感,暂态过程,分子电流与磁介质,铁磁体,边界条件,磁路定理,磁场的能量和磁能密度,位移电流, Maxwell 方程组,电磁波和玻印廷矢量等。

The socket structure is provided with a zero phase trigger control unit, through the photoelectric sensing element of the unit, optical coupling can be performed to generate zero phase trigger, and the opening or the closing of a two-way thyratron in the zero phase can be accurately controlled, therefore, an electric device inserted on an output socket can be started or stopped from the zero phase, in order to reduce the electromagnetic interference and prolong the service life of the electric device, the use efficiency of the electric device can be enhanced, the power supply thereof can be saved, filtering and rectifying can be performed through a current switching unit when the alternating current power supply passes through a filtering and rectifying circuit, the noise caused by external interference and affect can be filtered, and the power supply can be respectively transmitted to a current detecting socket and the input end of the current switching unit to be detected through a temperature sensor arranged on the current switching unit.

本实用新型为有关一种插座结构,尤指为设有零相位触发控制单元,可通过其光电感测元件来进行光耦合而产生零相位的触发,且可准确控制双向闸流阀在零相位的开启或者关闭,进而达到插置于输出插座上的电器装置从零相位开始启动或者关闭,以降低电磁干扰而延长电器装置使用寿命,且可提升电器装置的使用效率及节省电源,并通过电流转换单元于交流电源通过滤波整流电路进行滤波整流,可滤除外部所干扰影响的杂讯,并分别传送至电流侦测插座及电流转换单元的输入端,而可通过电流转换单元所设置的温度感应器来进行侦测,于电路温度升高时,温度感应器可进行切断双向闸流阀的电源输出而达到保护输出插座上所插设的电器设备。

Along with of microprocessor of development, the urgent demand have to match with it mutually of connect the issue that ocular exterior measure the equipments directly, root for a living through applied personnel in technique in science, find out a kind of exits already of but the past was output the equipments by the tiny electric current, electric voltage that people neglect, namely the high man in Rogowski electric current spreads to feel machine with divide to press the machine, its output's is several 100 peaceful electric current s/ V electric voltage can control with tiny model protection directly the equipments pick up a people, satisfying the request that protection control measure, and basic dissolves traditional electromagnetism type the electric current, electric voltage feels with each other saturated weakness in machine.

随着微机的发展,迫切要求有配合它的相互连接的问题,眼球的外部测量设备直接,根为口奔驰,通过应用型人才,在技术科学,找到了一种已经退出的,但过去仅仅是输出设备是由微小的电流,电压,人们忽视,即高文在罗柯夫斯基电流差突然觉得机器与隔膜,迫使机,其输出的是几个100和平电流s音频/视频电电压可控制与微小模型直接保护的设备,接了一个人,满足了要求保护控制措施,并基本溶化传统的电磁式电流,电压觉得与对方饱和疲软机器。

Two kinds of silicon samples with distinct surface treatment, i. e., one surface was chemically etched and the other was unetched, were used to investigate the characteristics of leakage current and surface flashover of semiconductor under impulse voltage in vacuum. The experimental results showed that the surface conditions of samples affected these characteristics greatly. Before flashover, the Ohmic current was observed for unetched samples and the space charge limited current for etched samples, respectively. Meanwhile both samples showed quite different flashover tracks, and the surface-etched samples displayed a much higher onset voltage of flashover.

对采用和未采用表面化学腐蚀处理的半导体硅在冲击电压下的实验表明(参见 Zhang et al , Applied Physics Letters, 2002),试品的表面状况对其泄漏电流和沿面闪络特性有着很大的影响:在沿面闪络之前,未经处理试品的泄漏电流表现为 Ohm 性电流,而表面处理过的试品表现为空间电荷限制电流特性;同时两类试品表面的闪络通道也表现出不同的特征,而采用表面化学腐蚀处理可以明显提高其沿面闪络电压。

Through the analysis of the work principle of three phases voltage resource PWM converter, set up the low and high mathematic models, deduce the restriction equations about grid voltage, grid current, modulation voltage and the DC output voltage and the calculation equations of the AC-side inductance and the DC-side capacitance. There are two control strategies are adopted: Predicted current control strategy and voltage-current two closed-loop control strategy, and give a comparison by theory and practice.

通过分析三相电压源型PWM变换器的工作原理,分别分析了低频和高频数学模型,并推导出了交流侧电压电流、调制电压、直流侧电压之间的数学约束关系以及交流侧电感和直流支撑电容参数的选取依据公式;分析对比了两种控制策略:预测电流控制和电压电流双闭环控制并加以实验验证;同时采用了负载电流前馈补偿和本文提出的一种基于专家系统的神经元新型智能PI控制器两种方法大大提高了整个系统的动态响应性能,并在仿真和实验中加以验证,这也是本文研究的重点内容之一。

The result shows that to improve the anodic current efficiency, we should decrease the reactions in the anodic solution between dissolving chlorine and transferring sodium hydrate and reduce a series of the reactions between the anode and the cathode.

本论文首先阐述了氯碱工业生产技术发展历史,并介绍离子膜法电解产生、发展过程以及其发展方向,考察了影响电流效率的各种因素,并提出提高电流效率的措施,得出要提高阳极电流效率,就要尽量减少在阳极液中产生的溶解氯与迁移烧碱之间发生的副反应,减少阳极上氧的析出量;要提高碱的电流效率,就要尽量减少氢氧根离子向阳极室的反渗。

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According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm~150rpm时取得最大值,此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世,形体几无变化。

When I was in school, the rabbi explained everythingin the Bible two different ways.

当我上学的时候,老师解释《圣经》用两种不同的方法。