控制矢量

In this paper, on the basis on analyzing of asynchronous motor, DTC principle and torque ripple characteristic, the vector subdivision method is studied particularly, and at the same time, an improved optimized switch stable method is proposed.

在分析了异步电机数学模型、直接转矩控制原理以及转矩脉动特性的基础上，对基于空间电压矢量的矢量细分法进行了详细的研究，并在此基础上提出了一种改进优化开关表法。

This paper provided a control way based on magnetic-flux and double space vector for the synchronous motor.

摘 要：提出基于磁链参考矢量和双空间矢量调制的矩阵变换器在船用永磁同步电机控制中的策略。

Firstly, two covering hypersphere algorithms were proposed, referred to as minimum volume covering hypersphere algorithm and moving medium centers covering hypersphere algorithm, to heuristically and rapidly select the promising hidden center vectors from all the training samples. Then the particle swarm optimization algorithm combined with recursive orthogonal least square algorithm was used to further prune the initial hidden centers and optimize the control parameters.

为在实际应用中加速优化速度，降低优化计算复杂度，首先提出了最小体积覆盖超球和移动平均中心覆盖超球两种算法，用于启发式的从训练样本中快速的初选出径向基概率神经网络的隐中心矢量，然后将粒子群优化算法和 ROLSA 结合进一步优选隐中心矢量，同时优化核函数控制参数，实现径向基概率神经网络的全结构优化。

A font is read at first to complete decoding; vector font is converted into lattice font, while non-vector font is converted into a standardized bitmap; moreover, the standardized bitmap obtained through decoding is stored as a quick compression lattice font file; then, lattice matrix transformation is realized through a word stock engine control module, a font information extraction module, a font carving frame core module and a font presentation module; finally, frame depiction is finished.

一种在终端上实现带边框字体的系统与方法，包括利用字体转换模块进行字体转换；即首先读取字体文件，进行解码；对于矢量字体，先转换为点阵字体，对于非矢量字体，转换为规范化的位图，把解码得到的规范化的位图，保存为快速压缩点阵字体文件；然后通过字库引擎控制模块，字体信息提取模块，字体雕刻边框核心模块和字体呈现模块实现点阵矩阵变换，刻画边框。

Pulse Width Modulation technique is one of the most important contents in the digital current control. Two PWM algorithms–Asymmetric Regular Sampling PWM and Space Vector PWM, is described. in detail, and then a fast algorithm of Space Vector PWM is got by combining the advantages of the two algorithm.

脉宽调制技术是数字电流控制中的核心内容，文中详细分析了非对称式规则采样法和空间矢量法两种PWM调制方法的原理和计算方法，在对这两种方法比较的基础上，介绍了一种空间矢量PWM的快速算法。

The intelligent power module, the detect circuit of current and motor speed, DSP and the program implement of the function module of the squirrel-cage induction motor vector control system are all presented particularly in this paper.

文中对智能功率模块 IPM、DSP 芯片、电流和转速检测电路以及异步电机矢量控制系统各个功能模块的 DSP 编程实现都进行了详细的介绍，重点介绍了模糊算法和空间矢量算法的 DSP 编程实现方法。

Three-phase Asynchronous Motor;Digital Signal Processor;Intelligent Power Module;Vector Control;Space Vector Pulse Width Modulation

三相异步电动机；数字信号处理器；智能功率模块；矢量控制；电压空间矢量脉宽调制

They included the effect of zero voltage vector in PMSM DTC, the select principle of space voltage vector, the control of stator magnet chain, the enhance of system dynamic performance, and the realization of PMSM DTC system.

主要包括零电压矢量在PMSM DTC中的作用、电压空间矢量的选择原则、定子磁链的控制方式、系统动态性能的保证、PMSM DTC系统的实现等问题，给出了系统的软件设计方法。

The GVF force does better than the other two forces in the segmentation of complex images with concaves. The gradient plus pressure force does better in preventing the model from crossing the slim images.［KEY WORDS］ image segmentation; active contour model; GVF; open contour model

对于简单的图像，梯度外力和梯度矢量流外力均能得到较好的分割结果；对于较复杂及边界凹陷的图像，梯度矢量流外力的分割效果明显好于其他外力；对于纤细图像应用梯度加压力的外力更容易控制模型越界的现象。

The paper uses the strategies of pitch angle control and rotational speed control. For the rotational speed controller, vector control method in the dq synchronous rotational frame was employed.

系统采用了桨距角控制和发电机转速控制策略，而发电机转速控制采用了dq同步旋转坐标系下的矢量控制。

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。