转调

With the development of various technologies such as motor control, Vector Control and Direct Torque Control appear one after the other. Hereinto, VC is been applying broadest for it's excellent performance.

随着交流电机控制等各种技术的发展，矢量控制和直接转矩控制等高性能调速系统相继出现，其中矢量控制以其优良的性能成为目前实际应用最为广泛的调速方法。

From the view of torque controlling strategy, the relation between the torque controlling strategy such as the electric current feedback method、 PWM open loop method etc and the vehicle driving way is analyzed firstly, then the conclusion could be drawn that the PWM open loop method has more advantages than the electric current feedback method when they are both used in the same vehicle which is direct driving by hubcap motor. Secondly, based on the electric motor mathematic model and its experiment, a new permanent brushless dc motor phase electric current detector method in which a digital signal processor and single current sensor are used is introduced.

从转矩控制策略角度来看，分析了电流反馈法以及开环PWM电压调速控制方法与车辆的驱动方式关系，得出了电机驱动电压受限的情况下，无论是从对车辆的动力性能影响还是从对车辆的驱动要求来讲，开环PWM电压调速控制方法较电流反馈法更适用于以轮毂电机直接驱动方式的两轮电动车中；其次，根据电机的数学模型以及电机试验波形，提出了一种利用数字信号处理器以及单个电流传感器检测三相永磁无刷电机电枢电流的新方法，这种方法具有较强的适应性、实时性，它可以根据控制系统的要求，适时地提供所需电流数据，是目前许多文章关于无刷电机相电流平波的重要技术基础。

ABSTRACT:In 1970's,one method of AC induction motor control called Direct Torque Controlwas raised.

直接转矩控制是20世纪70年代提出的，在80年代中期发展起来的新型电机调速方法，是继矢量变换控制技术之后，且与之并行发展的一种新型的高性能的交流调速传动的控制技术。

Due to these characteristics,it is especially suitable for those situations with high voltage level,High Power and not large speed adjustment range,such as wind machines and pump load. Direct Torque Control which was developed rapidly in the middle of 1980's has been applied to many occasions up to now .

直接转矩控制是80年代中后期发展起来的新型电机调速方法，是继矢量变换控制技术之后，且与之并行发展的一种新型的高性能的交流调速传动的控制技术。

Due to thesecharacteristics,it is especially suitable for those situations withhigh voltage level,High Power and not large speed adjustmentrange,such as wind machines and pump load. Direct Torque Control which was developed rapidly in the middle of 1980's has beenapplied to many occasions up to now .

直接转矩控制是80年代中后期发展起来的新型电机调速方法，是继矢量变换控制技术之后，且与之并行发展的一种新型的高性能的交流调速传动的控制技术。

The cascade speed regulation for AC motor can effectively and economically utilize the slip power of wound rotor asynchronous moter to regulate the speed.

交流电动机的串级调速是一种将绕线式异步电动机的转差功率利用起来的一种高效、济的调速方法。

The main products are as follows, three different step motors of YS series, the YY series electric capacity operates the asynchronous motor, YC (YC2) serial single-phase electric capacities start the asynchronous motor, the YU series resistance starts the asynchronous motor, asynchronous motor of electric capacity of a pair of value of YL series, three different step motors of Y series, three different step motors of Y2 series, YD series change the asynchronous motor of extremely many speeds, YH series are transfered to three different step motors of difference rate high, the YCJ series gear wheel moderates three different step motors, YEJ series electromagnetic to apply the brake three different step motor, YCT series electromagnetic to transfer speed three different step motor , YVP series frequency conversion transfer speed asynchronous motor , YSF series axle flow fan special-purpose three different step motor, Three different step motors of YZU series vibration source , the electronic device of YDF2 series valve uses three different step motors and YOX series limit distance type hydraulic coincidence device , ZLY spatters and makes such 28 series and more than 1500 specifications as the coil post tooth decelerator ,etc..

主要产品有：YS系列三相异步电动机、YY系列电容运转异步电动机、YC（YC2）系列单相电容起动异步电动机、YU系列电阻起动异步电动机、YL系列双值电容异步电动机、Y系列三相异步电动机、Y2系列三相异步电动机、YD系列变极多速异步电动机、YH系列高转差率三相异步电动机、YCJ系列齿轮减速三相异步电动机、YEJ系列电磁制动三相异步电动机、YCT系列电磁调速三相异步电动机、YVP系列变频调速异步电动机、YSF系列轴流风扇专用三相异步电动机、YZU系列振动源三相异步电动机、YDF2系列阀门电动装置用三相异步电动机和YOX系列限距型液力偶合器、ZLY渐开线圈柱齿减速器等28个系列1500多个规格。

We refer to this method of utilizing additional electromotiveforce to recycle slip power as concatenation control with doubleclose loop, which is also the focus of this paper.

把这种用附加电动势的方法将转差功率回收利用的调速称为双闭环串级调速。这是本文所必须讨论的，也是本文的核心所在。

We refer to this method of utilizing additional electromotive force to recycle slip power as concatenation control with double close loop which is also the focus of this paper.

把这种用附加电动势的方法将转差功率回收利用的调速称为双闭环串级调速。这是本文所必须讨论的，也是本文的核心所在。

Based on the research on the theory and technology of dual-PWM variable frequency AC motor control, a design of dual-PWM variable frequency AC motor control system which has factor control loop rectifier and slip frequency speed regulator is proposed.

本文在总结和研究当前双PWM变频调速基础理论和常见技术的基础上，设计并研究了一种基于DSP的整流侧功率因数闭环、逆变侧转差频率控制的双PWM异步电机变频调速系统。

I'm strongly against the death penalty — it's an eye for an eye.

我不赞成死刑——这是以牙还牙的报复行为。

And to get you the support you need, we're enlisting all elements of our national power: our diplomacy and development, our economic might and our moral suasion, so that you and the rest of our military do not bear the burden of our security alone.

并给你们所须的支援，我们正徵召国家所有各种的力量：我们的外交及发展，我们的经济力量与道德劝说，所以你们与其他军人不须要孤独地负起国家安全的责任。