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Research on water flooding effect improved by vectorial well arrangement for reservoirs with permeability heterogeneity in plane;

矢量井网改善平面非均质油藏水驱开发效果研究

Random Directive Vector Dimension Chain and Its Application in Machine Tool Design and Manufacture;

随机方向矢量尺寸链及其在机床设计制造中的应用

To solve the problems associated with Direct Torque Control(DTC) of Permanent Magnet Synchronous Mo-tor(PMSM) using conventional voltage space vectors,such as high current,flux and torque ripple,a novel DTC strategy based on voltage space vectors and stator flux linkage sectors subdivision is proposed.

由于采用传统的电压空间矢量开关表控制逆变器动作的永磁同步电机(Permanent Magnet Synchronous Motor,简称PMSM)直接转矩控制(Direct Torque Control,简称DTC)存在着电流畸变、磁链和转矩脉动大的缺陷。

This paper presents a novel speed-sensorless direct torque control method based on vectors subdivision,analyses and compares the performance of traditional six-voltage vector control and twelve-voltage vector s,finally provides the experimental results of the system implementation using dsPIC30F6010.

传统的直接转矩控制在进行矢量切换时会造成磁链幅值的显著变化,从而引起磁链轨迹畸变。