直流电机

In this paper, a BUCK circuit added lead before the full bridge which used in BLDCM drive system is proposed, and this drive system is studied.

在永磁无刷直流电机驱动系统中，本文提出在传统的三相桥前加上BUCK电路，用于永磁无刷直流电机的驱动，并就系统进行了理论分析与实验研究。

Pass the function that study the core controller MCS89C51 and application, constituted to be adjusted by a keyboard/ showing controller 8279, arithmometer/timer 8253 and from ZSZ-02 as mainly controlling the slice of electrical engineering soon system.

核心控制器的主要组成由89C51单片机、键盘/显示芯片8279、可编程计数器/定时器8253以及自整角机角度转换器ZSZ-02；直流电机驱动电路由4只三极管及4只可控硅组成，完成直流电机的调速及正反转。

In the light of the trapezoidal back electromotive force and square phase current of brushless DC motor,a novel strategy of matrix converter driving BLDCM is presented in this paper.

针对无刷直流电机反电势为梯形波、相电流为方波的特点，提出一种用于驱动无刷直流电机的矩阵变换器的控制策略。

The thesis first probably explains BrushLess Direct Current Motor, and discusses the related control methods, explains the background and Meaning of back electromotive force which is used in the thesis.

本文首先对无刷直流电机进行了概述，并对其相关控制方法进行了讨论，说明本文所采用反电动势法的背景和意义；接着论述了无刷直流电机基本组成环节、基本工作原理、运行特性和传递函数，然后是详述本文研究的重点：基于反电动势法的MATLAB调速系统的仿真以及基于反电动势法的DSP控制系统的实现。

The thesis first probably explains BrushLess Direct Current Motor, and discusses the related control methods, explains the background and Meaning of back electromotive force which is used in the thesis.Then the thesis expounds the basic component parts,the basic running principle,the running characteristic and transfer function of the BLDCM.And then the thesis detailedly dissertates its research pivot: the simulation of BLDCM system in MATLAB based on the method of Back-EMF and the control system of Digital Signal Processor based on the method of Back-EMF.

本文首先对无刷直流电机进行了概述，并对其相关控制方法进行了讨论，说明本文所采用反电动势法的背景和意义；接着论述了无刷直流电机基本组成环节、基本工作原理、运行特性和传递函数，然后是详述本文研究的重点：基于反电动势法的MATLAB调速系统的仿真以及基于反电动势法的DSP控制系统的实现。

Variable magnetic pole DC motor can resolve the problem of commutator existing in the traditional DC motor.

变磁极性直流电机解决了传统直流电机的换向器问题。

But because of some disadvantages such as their complex configuration, costliness, inconvenience of maintenance, they are gradually replaced by asynchronous machines.

传统的电梯采用直流电动机驱动，存在着结构复杂、制造成本高、可维护性差等系列不足，采用异步电机取代直流电机已是大势所趋。

Based on the mathematic model of BLDC motor, a combination of an improved BP neural network and a general PID con- troller is used in its speed servo system.

在分析无刷直流电机数学模型的基础上，采用改进型BP神经网络与传统PID相结合作为速度控制器，应用于无刷直流电机调速系统中。

First, this paper analyses the basic structure and work principle of BLDCM, deduces its dynamic mathematical model.

首先，论文分析了无刷直流电机的基本结构和运行原理，构建了无刷直流电机的动态数学模型，为后续研究奠定了理论基础。

At last ,it drew a conclusion that summarined the design thought of permanent magnetic brushless DC motor control system after absenting waves of controllers work . Permanent Magnetic Brushless DC motor control system canbecome main power source in ship electric propulsion field ,and the research have important s signification.

最后，在控制系统实际运行时对波形进行了观测，给出了结论，总结了无刷直流电机控制系统的设计思想，提出永磁无刷直流电机将成为船舶电力推进的主要动力，对其控制系统的研究具有广泛的应用价值。

At the rear was an innovative combination transaxle with the gearbox, clutch, differential, and inboard-mounted drum brakes.

在后面是与变速箱，离合器，差的创新结合变速，和内侧安装鼓式制动器。

For more people can apprecaite and have the master work, there is reproduction painting appears in the market, the large various selection of paint,the high saturation of color plus the plentiful sfumato, to make the reproduction perfect copy and detail as original painting, so as to meet the requirment of amateurs who love art paintings,they do not need to pay high price to get classical paintings.

颜料色域广，色彩饱和度高，色彩层次丰富，图像色彩还原真实，能完美的复制原作，满足艺术爱好者欣赏，艺术爱好者们不用支付昂贵的价格就能拥有经典油画。