磁链

The flux observer can ensuring flux linkage to be perpendicular to back electromotive force,so that the stator flux linkage can be estimated accurately over a wide speed rang.

观测器从确保磁链和反电势正交的角度出发，保证了电机在宽运行范围定子磁链观测的准确性。

The improved voltage model of rotor flux is proposed in the paper. It eliminates the influence to actual system function in the voltage model of rotor flux for the proper drift problem and cumulative error of pure integral calculus tache.

提出了改进的电压型转子磁链估算模型，消除了电压型转子磁链估算模型中纯积分环节所固有的漂移问题和积累误差对实际系统性能的影响。

And the thesis is divided into 4 parts.In the first part, the development of technology on Adjustable Speed AC Dirve is introduced. And the theory of DTC is analyzed. Besides the two classic DTC strategy, the hexagon flux track and approximate circle flux track controlling system, the thesis introduces some DTC strategies modified and some new controlling arithmetics.

论文共分为四个部分：第一部分介绍了交流调速技术的发展，分析了异步电机直接转矩控制的基本原理，除六边形磁链和近似圆形磁链两种经典的DTC控制之外，还介绍了改进型DTC及其他新型的控制算法。

The change of observation error was analyzed in the case of stator flux observer ui model at high speed and in model at low speed when the parameters of motor changed based on the mathematical model in the stationary coordinates.

利用静止坐标系下的异步电机数学模型，分析当电机参数改变时，高速运行状态下定子磁链观测器 u i 模型和低速运行状态下 i n 模型的观测误差变化情况，然后给出定子磁链全阶观测器增益矩阵的确定方法。

In chapter I, I mainly describe some theorems for Heisenberg AFMs, and the history of models of putting impurities in pure S=1 Haldane chain which can give any clue to our study.

在第一部分的第一章，我们主要回顾了往S=1的自旋反铁磁链里掺杂历史，介绍了与Heisenberg 反铁磁链相关的一些定理，讲述了一些前人所做的工作，及其提供的理论线索。

From the concept of winding inductance、 magnetic linkage and the store coenergy, this paper deduces the quantitative relationship between motor speed, n, reluctance torque and winding's voltage, Us, and investigates whether it is correct or not through tests.

分析了开关磁阻电动机的一种调速方法——调压调速；从绕组电感、磁链及磁共能的概念出发，导出调压调速方式下电机转速n，磁阻转矩M及绕组端电压US之间的定量关系，并通过实验验证了三者之间关系的正确性；给出适合于开关磁阻电动机调压调速系统的8098单片机使用PID数字控制器的控制算法，最后介绍2。

Direct torque control is another high performance control technique of AC motor, it discard the decouple idea of vector control, but adapt flux oriented control and transient space vector theory, directly control stator flux and torque, it has the advantage of rapid torque response and less relying on stator parameters, but has the disadvantage of bigger torque ripple.

直接转矩控制技术是继矢量控制技术之后的又一种交流电机高性能控制技术，它摈弃了矢量控制中解耦的控制思想，采用定子磁链定向和瞬时空间矢量理论，直接对电机定子磁链和转矩进行控制，具有转矩响应快、对电机参数依赖小的优点，但它的不足之处就是存在转矩脉动。

The flux hysteresis controller was ignored in the constant torque region and an improved method was proposed to make the estimation of torque easier.The proper stator voltage space vector was selected based on the output of the torque hysteresis controller and the sector which the current rotor flux locates in.

摘 要：针对无刷直流电机直接转矩控制中磁链观测困难、控制复杂等问题，提出了一种应用于无刷直流电机二二导通方式下的新型直接转矩控制方法：在电机基频以下调速时，略去了常规的磁链观测控制环节，改进了转矩计算方法，通过转矩滞环控制选择所施加的空间电压矢量。

A new brushless DC motor DTC scheme was studied to solve those problems associated with direct torque controlof brushless DC motor,such as difficulty to control flux and complexity to estimate torque.The flux hysteresis controller was ignored in the constant torque region and an improved method was proposed to make the estimation of torque easier.The proper stator voltage space vector was selected based on the output of the torque hysteresis controller and the sector which the current rotor flux locates in.

摘 要：针对无刷直流电机直接转矩控制中磁链观测困难、控制复杂等问题，提出了一种应用于无刷直流电机二二导通方式下的新型直接转矩控制方法：在电机基频以下调速时，略去了常规的磁链观测控制环节，改进了转矩计算方法，通过转矩滞环控制选择所施加的空间电压矢量。

Indirected the basic theory of the current, flux, position of the switched reluctance drive based on the flux method. proposed a position sensorless technique for SRD with energy optimizing strategy. Presented an mathematical method of the average torque maximization. Matlab simulated optimal switching angle at different speed, and verified by experiment.

为了便于转子位置信息检测，首先讨论了开关磁阻电机电流－磁链－位置关系的基本原理，给出了一种基于能量优化的磁链法的间接位置检测方案，然后推导出平均转矩最大化的数学模型，并利用Matlab仿真出不同转速下的最优开关角，最后通过实验予以验证。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。