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Detailed discussion about distribution and changes of the current in every rotor bar and end ring, the relationship between the number of broken-bar and fault features in stator current after broken bar fault appearing was shown.

转子断条位置对电机影响很大,过去没有引起人们的重视,该文对此进行深入研究,分析电机转子断条位置与故障特征量之间的关系,转子断条位置与转子导条电流、转子端环电流之间的关系,并总结出其规律,指出哪些位置导条进一步断裂的可能性较大。

To meet with the DC feeder cable without ground wiring, different DC current method was proposed to solve the problem of DC leakage curren on-line detection of the cable. The paper still studied in primary the feasibility of low frequency superposition method to detect the DC feeder cable. It not only explained the working theory of the system, but also presented some problems to be solved.

针对直流馈出电缆无接地线,提出采用差量直流电流法解决了电缆直流泄漏电流的在线检测问题,并初步研究了低频叠加法监测直流馈出电缆的可行性,给出了工作原理及还需解决的问题。

The basic relationship between the the first half-wave peak value of transient current and the initial firing angles is found by means of analytical method.The practical method is put forward to determine the initial two-phase and the third phase firing angles with the limiting value and the space vector varying track of transient current.And then the subsequent series of firing angles with the even step are calculated by using the speed at the time of re-switching.The suppressive effect to the inrush current is verified with simulation and experiment of rapid soft re-switching control,by which the influence of different speed to rapid soft re-switching course is analyzed besides.3 To analyze the power loss for typical periodically variable running load and deeply study the energy-saving principle and control mode of the intermittent power supply approach. Futhermore,the novel integrated energy-saving control technique is developed on base of the intermittent power supply approach.

通过解析方法找到快速软投入初始触发角与瞬态电流首半波峰值加热板之间的基本关系,进而提出了由限流值和空间向量轨迹确定初始两相和第三相触发角的方法,并以固定步长均匀递减的方式由投入时转速计算出其它后续触发角;结合仿真和实验验证了快速软投入对冲击电流的抑制作用,并分析了不同转速下投入时对电源快速软投入过程的影响。3对典型周期性变工况负载特性进行能耗分析,深入研究断续供电节能机理和控制模式,并进一步发展了以断续供电为主的综合节能控制新技术。

The basic relationship between the the first half-wave peak value of transient current and the initial firing angles is found by means of analytical method.The practical method is put forward to determine the initial two-phase and the third phase firing angles with the limiting value and the space vector varying track of transient current.And then the subsequent series of firing angles with the even step are calculated by using the speed at the time of re-switching.The suppressive effect to the inrush current is verified with simulation and experiment of rapid soft re-switching control,by which the influence of different speed to rapid soft re-switching course is analyzed besides.3 To analyze the power loss for typical periodically variable running load and deeply study the energy-saving principle and control mode of the intermittent power supply approach. Futhermore,the novel integrated energy-saving control technique is developed on base of the intermittent power supply approach.

通过解析方法找到快速软投入初始触发角与瞬态电流首半波峰值之间的基本关系,进而提出了由限流值和空间向量轨迹确定初始两相和第三相触发角的方法,并以固定步长均匀递减的方式由投入时转速计算出其它后续触发角;结合仿真和实验验证了快速软投入对冲击电流的抑制作用,并分析了不同转速下投入时对电源快速软投入过程的影响。3对典型周期性变工况负载特性进行能耗分析,深入研究断续供电节能机理和控制模式,并进一步发展了以断续供电为主的综合节能控制新技术。

Electrorheological fluid ; compressive stress ; compression speed ; electric field strength ; current density

电流变液;压缩应力;压缩速度;电场强度;电流密度

Due to the salient structure of SRM, the flux linkage is a nonlinear function of both the rotor position and excitation current, which makes the measurement difficult.

该系统通过DSP 片内外设模块实时采集电机的电压电流信号,并将结果传送至上位机,利用数字离散方法计算磁链,建立磁链与电流、位置角度的对应关系。

Based on analysis of the features of three-phase four-line power supply system and nonliear load current harmonic pollution,compensation method of simultaneously compensating voltage sag and synthetic power quality of load low-voltage of harmonic current was proposed,and corresonding hybrid unified power quality compensator was also designed.

通过对三相四线制供电系统的特点和非线性负载电流谐波污染分析,提出了可同时补偿电压跌落、谐波电流的负载端低压综合电能质量补偿方法,并设计了对应的混合型低压电能质量综合补偿器。

To detect the harmonic and reactive power current of four-phase transmission system, the current detection method for four-phase transmission system is presented based on FBD method, which is on the basis of improving the FBD method definitions.

为了检测四相输电系统中的谐波和无功电流,在进一步完善FBD法定义的基础上,提出了一种基于FBD法的四相输电系统电流检测方法。

In this paper, a current control mathematical model is established with fixed switching frequency for three-phase pulse width modulated converter.

建立了三相电压型PWM整流器电流控制数学模型,输入电流在静止坐标系下实现了固定开关频率的解耦控制。

The voltage, the electric current use the linearity to be good, also frequency range width voltage, electric current sensor.

电压、电流采用线性好,且频率范围宽的电压、电流传感器。

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