As a result , dtc system is affected by fewer parameter of the motor and has less complex structure and fewer calculations . since it was brought forward , direct torque control has been took serious attention by domestic and foreign scholars because of its novelty idea , simple structure and wonderful property . this paper adopts the fuzzy controller to select the voltage vectors after expound the basic theory of dtc , and this method is improved to be effective by the result of the emulation 本文在阐述直接转矩控制原理的基础上，针对常规的直接转矩控制系统由于转矩调节器和磁链调节器采用施密特触发器，其容差的大小对系统性能影响大这一缺点，将智能控制理论应用于直接转矩控制中，用模糊控制器进行电压开关状态选择，使系统的性能得到明显地改善。
On one hand , the structure of delay unit is redesigned . in the case of the structure composed of three 2 2 optical switches , the relations between the status of optical switches and delay error are analysed by calculation and deduction , then a new delay unit composed of six 1 2 optical switches is designed and take place of the tranditional structure 一方面,改进可变光纤延迟单元的结构,以3个2 2光开关构成的延迟单元为例,对其开关状态与延时误差之间的关系进行了理论分析和公式推导,并根据这一结果设计了由6个1 2光开关构成的具有较低延时误差的3 - bit可变光纤延迟单元。
The central control room of the branch is located in the bank of communications plaza in the lujiazui , shanghai , which adopts the xbrother developed professional security and facility control system which monitors and controls 10 subsystems in the central control room , including : the ups control system ; the coulometer control system ; the leaking control system ; the temperature and humidity control system ; the air conditioning control system ; the video surveillance system ; the sensor of in out water temperature control system ; the access control system ; the switch control system and ; the fire alarm system 交通银行机房位于上海浦东新区陆家嘴金融中心的交银金融大厦内，其机房监控系统采用我司自主研制的专业机房监控系统。对机房内的ups监控系统电量仪监测系统漏水监控系统温湿度监控系统空调监控系统视频监控系统进出水温传感器监测系统门禁监控系统开关状态监控系统消防监控系统等10个子系统进行集中监控，对所有的设备和系统进行工作状态运行参数报警处理等监视和管理。
In dtc system , the concept of space vector is introduced to analyze and control the ac motor , the electromagnetic torque and flux are calculated and controlled in the stationary coordinate , and the optimal pwm gating signals are generated to control the inverter to acquire high dynamic torque according to the output of the bang - bang regulators 直接转矩控制采用空间矢量的概念来分析三相异步交流电动机的数学模型和各物理量，直接在静止坐标系下计算与控制交流电动机转矩和磁链，借助于离散的两点式调节产生pwm信号，直接对逆变器的开关状态进行最佳控制，以获得转矩的高动态性能。
In dtc system , the concept of space vector is introduced to analyze and control the ac motor , the electromagnetic torque and flux are caculated and controlled in the stator reference frame , and the optimal pwm gating signas are generated to control the inverter according to the output of the bang - bang regulator . in this paper , the dtc system is designed based on dsp . a speed estimation method is derived detailedly and the sensorless speed close - loop control is conducted . in this system , there are some problems , such as flux drift and torque ripple . to resolve these problem , a modified flux caculation method and some measures such as speed lpf , torque slide filtering are adopted . the system performance is enhanced by these mersures 直接转矩控制采用空间矢量的概念来分析异步电机的数学模型和控制其各物理量，直接在定子坐标系中计算和控制转矩和磁通，借助于离散的两点式调节( bang - bang控制)产生pwm信号，直接对逆变器的开关状态进行优化控制，以获得转矩的高动态性能。本文采用dsp设计了直接转矩控制系统，详细推导了速度估计方法，进行了无速度传感器的速度闭环控制。
In the conventional pmsm dtc system , the stator flux linkage is calculated from the integration of the difference between the machine input voltage and voltage drop across the stator resistance , and the input voltage is obtained by synthesizing the dc - link voltage and the switching mode of the inverter 在常规直接转矩控制系统中，定子磁链是通过直接积分电机端部输入电压与定子电阻压降之差计算得到的。电机端部的输入电压又是通过电机直流母线电压和逆变器的开关状态综合得到的。
The system will display the gate status , the thunder status and fire signal status . it allows the management clearly receiving running status of all facilities and subsystems in the central control room . the system graphically displays the alarm position , informs management by phonetic alarm and provides relevant disposal method for the management , which reduce cost of undesired contingency 虹口税务局基于节能和高效管理的考虑，在夜间，如果双鉴探头检测到有人活动，则自动控制灯光开启与关闭，同时联动视频进行录像，并在界面上实时反映门的开关状态防雷的状态消防信号的状态等，让机房管理人员通过机房监控系统统能够全面地了解机房内所有设备和子系统的运行状态，并形象地显示报警发生的位置，进行语音提示，同时提示相应报警的处理方法，将损失减少到最小。
Firstly . operation principle of induction heating is introduced and the actuality of the power supply for induction heating is summarized . then , the scheme of structure of the power supply is established : uncontrolled rectifier and buck chopper constitute dc circuit . in this part , operation principle of a kind of soft switching buck chopper is presented mainly and the conclusion that the power semiconductor devices operate in soft switching is also illustrated by analysing the operation principle of all stages ; series resonant inverter is selected as inverter circuit via comparing the advantage and shortcoming of parallel resonant and series resonant . moreover . the work principle of series resonant inverter is analysed and the calculating method of the best dead time is put forward as well 文中首先介绍了感应加热电源的工作原理并综述了国内外的研究现状。接下来分析并制定了电源主电路的构成方案：在对比几种功率调节方式的基础上选择了不控整流加斩波调压作为直流部分。在这部分里，重点研究了一种软开关buck变换器，通过分析各阶段的工作原理说明了开关器件如何工作在软开关状态；对于逆变器部分，在比较了串、并联逆变器优缺点的基础上选择了串联谐振逆变器，并详细分析了串联逆变器的工作原理，提出了最佳死区的计算方法。
On the basis of the principle of direct torque control , a control strategy of the grade of errors for induction motor has been proposed to improve the performance of powertrain system of hybrid vehicle in this thesis . the stator flux error , electric magnetic torque error and flux position angle are considered as control variables , and the switching states are determined by the control rules of the direct torque control 本文在直接转矩控制系统的基础上提出了一种基于误差等级的直接转矩控制dtc策略，它以电机定子磁链误差、电机电磁转矩误差及磁链位置角作为控制变量，然后根据直接转矩控制原理制定控制规则来选择开关状态，进而提高系统瞬态时的转矩响应。
The jet engine is an implement that can produce instant control force . the force controlled by the electromagnetic valve , worked in the magnitude of millisecond . when hvp is rolling , the jets , positioned on the missile , turn on and off and the needed controlling force was developed 侧喷发动机是一种快速产生直接控制力的装置，其作用力的产生在毫秒( ms )数量级，通过电磁阀门控制其开关，喷口相对旋转火箭弹固定，在旋转火箭弹弹体旋转过程中改变喷口的开关状态，产生所需要的控制力。
