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Considering the state of open-phase and asynchronous operation in largepower unit, the magnetomotive force and harmonic current of stator and rotor aretheoretically analyzed. A fault simulation test is designed, which proves the theoreticalconclusion correct. Finally, in this thesis, the problems with open-phase protection andbreaker failure protection are discussed, and the improved scheme of protection ispresented.

对发电机组非全相异步电动运行状态下,定子绕组与转子绕组磁动势以及谐波电流进行了详细的研究,通过磁动势的矢量分解等方法,得出了电枢绕组电流不对称时磁动势的空间分布,推导出了各次谐波电流在定子绕组、转子绕组及相互间的感应关系;通过试验验证了理论分析结果的正确性。

The statistical test based on the Shanghai Composite Index suggested that certain technical trading rules should be able to gain stable excess profit in the long run, which could not be explained by nonsynchronous trading, transaction cost and time variation of expected returns. Thus, it can be concluded that the China's Stock Market is not weakly efficient.

对上证指数的统计检验说明一些技术分析规则可以带来长期、稳定的超额利润,而有效市场假定下的异步交易、交易成本和期望时变性都不能完全解释这种超额利润的存在,因此可以得出中国证券股票市场还没有达到弱态有效性的结论。

After carefully analyzed the principle of standard SVPWM and traditional overmodulation methods, this paper proposed one simple and effective overmodulation scheme. Experiments were carried out in one 1.5kW induction motor and its results were recorded and analyzed by PZ4000 Power Analyzer and the proposed scheme were proved to be effective.

在分析了标准SVPWM算法和常见各种过调算法的原理的基础上,提出了一种简单有效的算法满足过调控制的要求,在1.5kW异步电机上进行了实验并使用PZ4000功率分析仪对其结果进行了准确测量与分析,证明了本文提出的SVPWM算法可以有效地提高电源电压的利用率。

For finite number of frequency bins, the maximum throughput of synchronous system is about twofold to that of asynchronous system. It can be seen that the synchronous FH—CDMA system is related to slotted ALOHA system, and the asynchronous system is related to unslotted ALOHA system.

此外,还对ALOHA系统与FH—CDMA系统作了比较,得出:当要求分组错误概率较小时,FH—CDMA系统的吞吐量比ALOHA系统大得多;窄带系统中的时槽与FH—CDMA系统中的同步跳频相对应,而窄带系统中的非时槽则与FH—CDMA系统中的异步跳频相对应。

Based on the analyzing synchronization modulate and synchronism modulate, for the defects of synchronism modulate, uses prefabricating SPWM waves table, soft open loop synchronization model, exactitude modify and coarse modify, implements phase locking and synchronization accuracy.

在对SPWM逆变电源的两种常规调制方式与同步模式分析的基础上,采用异步调制方式,同时对该调制方式的缺点采用了SPWM波形表格预制法与软开环同步模式、粗调与精调相结合的方法,实现了高精度的锁相与同步技术。

By using of differentially drug release technology, various drug release profiles can be obtained by SOTs, and also, the weight of three layers of SOTs can be accommodated separately with unchanged dissolution profiles, thus, optimal formula which is suitable for tri-layer tableting machine can be achieved.

实验结果表明,通过异步释放技术的使用,可以使渗透泵制剂的释药曲线多样化,同时,该方法还可以在确保最终释药曲线不变的前提下,对三层渗透泵制剂中三个物料层的重量进行分别调节,从而得到最适合于三层压片机打片的三层渗透泵处方。

The third aspect is to complete the asynchrony invocation to depressing the dependence of provider and requester.

针对目前区分操作系统的方法难度较高的问题,设计了结合人工识别和代码区分的改进方法;第三个方面是降低服务双方时间上的依赖程度,这主要是指客户端可以异步地调用服务器端的服务,而不需要阻塞等待回应。

This paper describes different characteristics of traction motor for freight electric locomotive and pas-senger electric locomotive.

对客运电力机车和货运电力机车所用牵引电动机的不同特点进行描述,针对货运电力机车的使用特点,提出了速度为120km/h的交流传动电力机车用牵引电动机的设计方案,并指出开发货运用途变频交流异步牵引电动机的必要性。

The principles of Indirect Stator-quantities Control is proposed in the paper. Based on predicting models of induction machine, the ISC control system is completed. The structure of induction motor dreive system is shown, and the experiment results are presented.

本文介绍了间接转矩控制的基本原理,分析了基于异步电动机预测模型的间接转矩控制系统的组成及实现方法,给出了ISC的控制算法和电机预测模型,以及该系统的实时控制实验结果。

The parameters of the machine are measured by no-load test and short-circuit test. The relationship between the exciting current and corresponding air-gap voltage at the rated frequency is obtained, thus determining expressions for exciting inductance and exciting current in linear segment form. The equivalent circuits in a/30 reference frame are based on the parameters by above tests.

通过空载实验和短路实验对异步电机的参数进行了测量,由额定频率下的空载实验测得不同激磁电流与相应的气隙电势,给出了激磁电感与激磁电流的分段线性表达公式,为得到αβΟ坐标系统下的等值电路奠定基础。

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推荐网络例句

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸,那乌黑、忧郁的眼睛,她便会相信,他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失

But because of its youthful corporate culture—most people are hustled out of the door in their mid-40s—it had no one to send.

但是因为该公司年轻的企业文化——大多数员工在40来岁的时候都被请出公司——一时间没有好的人选。