查询词典 DC

The technique made full use of the characteristic of PR controller which can realize zero steady-state error in AC input signal in stationary frame. In the method, the active and reactive current component in the vector control strategy were transformed in the stationary frame to achieve the objective of keeping the DC-link voltage constant, adjusting the power factor and decoupling the active and reactive power. Compared with conventional double close-loop proportional integral controller, the PR technique is better in harmonic compensation without the complex rotating frame transformation and the couple or feedback voltage which is easily influenced by temperature and circuit parameters. The control algorithm is easy to be realized while the robustness and power quality is improved.

该方法充分利用了PR控制器能够在静止坐标系下对交流输入信号无静差控制的优势，将矢量控制策略下的有功电流和无功电流分量转换到静止坐标系下进行调节，实现网侧变换器维持直流电压稳定和调节功率因数的控制任务和双馈电机有功、无功功率的解耦控制，与传统的双闭环PI控制相比，该策略无需繁琐的坐标旋转变换，不存在受温度及电路参数影响的耦合项和前馈补偿项，且易于实现对系统低次谐波电流的补偿，减小了控制算法实现难度，提高了控制系统的鲁棒性和电网电能质量。

Structure and optical properties of ZnO films DC reactively sputtered at different oxygen partial pressure.

不同氧分压下直流反应溅射ZnO薄膜的结构和光学特性。

The main function of rectifier circuits is to convert AC to DC.

整流电路的主要作用是将交流电压转换成直流电压。

The dc voltage is obtained by rectifying and filtering the line voltage, most often by the diode-rectifier circuit.

对于一个交流电动机负载，其端电压要求是正弦的，其幅值和频率要求是可调的。

Meanwhile, it adopts special reductor with rare earth dual DC motor to complete chain transmission and updraft processs, Due to it, insure the product's quality and produce all kinds of specifications of oxygen-free copper rod, copper bar and copper pipe and etc.

本机组可分别采用单体、双体、三体工频熔铜炉，三相平衡，节电，节能，铸杆规格，节距、速度均可在设定范围内任意调节，机组按四立柱装配，采用特种减速器稀土双排直流电机一字形分别打链传动，上引，确保产品质量并能专业生产各种不同规格无氧铜杆、铜排、铜管等。

The Company since 2000, professional agent refrigerator refrigerator car manufacturers products, including electronic semiconductor series and DC compressor series.

本公司自2000年开始，专业代理厂家汽车冰箱冷冻箱产品，产品包括电子半导体系列和直流压缩机系列。

This algorithm is applied in the simulation research of DC Motor speed regulation system.

随着计算机技术和智能控制理论的发展，人们发现采用

For the reason of drawback of DC motor, the system adopted AC frequency conversion speed regulation.

为克服直流电机调速的缺点和提高性价比，系统采用了交流变频调速。

The objective of DC power modulation is to damp the relative swing of angle and frequency of the two areas from COI.

直流输电线路功率调制的目标是阻尼区域COI功角和频率间的相互振荡。

MSP430F169 microcontroller was the core components of control and measurement function of an electromagnetic relay characteristic parameter tester. The tester also included DC power module, power amplifier module, constant current source module, keys, and digital tube display module. The tester could test the data of 943-1C-12DS electromagnetic relays including the minimum pull-in voltage, maximum release voltage, relay coil voltage rating when the pull-contact time, release time as well as the contact value of the contact resistance. The system could complete automatic measurement parameters to achieve all the basic requirements of design. And all of the test data was displayed through the 74HC573 digital tube.

摘 要：以MSP430F169单片机作为控制和测量的核心部件，辅以直流稳压电源模块、功率放大电路模块、恒流源模块、按键和数码管显示模块等组成一个电磁式继电器特性参数测试仪，完成对943-1C-12DS电磁式继电器最小吸合电压、最大释放电压、继电器线圈电压为额定值时的触点吸合时间、释放时间以及触点接触电阻值的测试，该系统能够实现成套参数自动测量，所有测试数据通过74HC573数码管进行显示。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。