查询词典 Ac

In this thesis, soft starter equipment realized by thyristors power transform circuit is studied. To improve equipment performance, we apply variable reactance technique to AC motor soft starter study. The high voltage AC working winding of reactance is in series with motor winding, while low voltage control winding and thyristors groupware with intelligent controller constitute close loop circuit. We adopt thyristor phase control voltage-regulator mode to control low voltage winding, then control the reactance of high voltage winding, and then arrive at the goal-control the current and voltage of motor AC to realize motor soft starting.

本文研究由晶闸管功率变换电路实现的软起动器装置，为了提高装置的性能，将可变电抗技术应用于交流电机软起动研究中，电抗器的高压交流工作绕组与电动机绕组串接，低压控制绕组与带智能控制器的晶闸管组件组成闭合回路，采用晶闸管相控方式控制低压绕组，从而控制高压绕组的阻抗，以达到对电机电流与电压的控制，最终实现电机软起动的目的。

Sample configurations are 1 AC, 1 Hiper NMC, 1 Hiper ARC, 2 PRI DSPs,-OR- 2 AC, 1 Hiper NMC, 2 Hiper ARC, and 8 PRI DSPs,-OR- 2 AC, 1 Hiper NMC, 2 Hiper ARC, and 14 PRI DSPs.

样品配置1交流，1艾泰NMC，1艾泰弧，2革命制度党的DSP，或- 2交流，1艾泰NMC，2艾泰电弧，革命制度党的DSP和8，或- 2交流，1艾泰NMC，2艾泰弧，革命制度党的DSP和14。

Single-phase Sinusoidal Pulse Width Modulation Inverter Power Supply in this paper belongs to AC power supply (AC-DC-AC convert). Control mode adopts feedback of voltage control. The methods of intermitting power flux and changing duty-cycle can change pulse width of drive voltage that adjust and rectify output voltage ultimately.

本文设计的单相脉宽调制逆变电源属于交流电源，采用电压反馈控制，通过中断功率通量和调节占空比的方法来改变驱动电压脉冲宽度来调整和稳定输出电压。

The impacts of the ultra high voltage AC/DC grid on Fujian power grid are analyzed in this paper. The security and stability of Fujian power grid and the interactions among the AC and DC system are studied under the single/double faults of EHV AC transmission lines and monopolar/bipolar block faults of EHVDC system near converter station.

中文摘要：分析了交、直流特高压电网对福建电网安全稳定的影响，研究了特高压交流电网、特高压直流系统发生故障时福建电网的安全稳定性以及受端换流站附近交流电网单一或严重故障对直流系统的影响及系统安全稳定水平。

By the research of AC servo system , we prepare to combine the application of Ac servo system and the the design of Foot orthosis for the first time , openningout a new application field of AC servo system.

本文针对数控技术、交流伺服系统和足底矫形器加工特点进行研究与分析，首次将交流伺服系统的应用与足底矫形器的设计相结合，开发出交流伺服系统新的应用领域。

Taking the development platform of HVDC power transmission for example, the calculation result of impedance-frequency characteristic of traditional line commutated converter and that of FCC are compared. Simulation results show that the impact of impedance-frequency characteristic of converter on the resonance frequency of AC system is not negligible, and FCC can enhance the strength of AC system in a certain extent, improve system stability and effectively reduce AC equivalent impedance under resonance frequency, thus the harmonic instability of HVDC power transmission system can be avoided.

以直流输电开发平台为例，对传统电网换相换流器(line commutated converter，LCC)与FCC的阻抗频率特性计算结果进行对比，仿真结果表明换流器的阻抗频率特性对交流系统的谐振频率有着不可忽略的作用，FCC在一定程度上提高了交流系统强度，改善了系统稳定性，有效降低了系统谐振频率下的交流等值阻抗，从而更好避免直流输电系统谐波不稳定现象的发生。

Currently, Midea has the most sizeable and complete Air Conditioner production chain and Microwave oven production chain, holding the most sizeable and complete small household appliances and kitchen appliances industry groups, with products of residential AC, commercial AC, large-scale central AC, electric fan, electric cooker, refrigerator, microwave oven, water dispenser, washing machine, electric warmer, dish washer, induction cooker, water heater, cooking utensils, sterilizing cabinet, electric chafing dish, electric oven, vacuum cleaner and small household appliances, as well as the household appliances accessory products, such as compressor, electric motor, magnetron, transformer and enameled wire etc.

美的集团主要产品有家用空调、商用空调、大型中央空调、风扇、电饭煲、冰箱、微波炉、饮水机、洗衣机、电暖器、洗碗机、电磁炉、热水器、灶具、消毒柜、电火锅、电烤箱、吸尘器、小型日用电器等大小家电和压缩机、电机、磁控管、变压器、漆包线等家电配套产品，拥有中国最大最完整的空调产业链和微波炉产业链，拥有中国最大最完整的小家电产品和厨房用具产业集群。

In order to study diesel locomotive AC-DC electric-drive system, this thesis makes a analysis of the primary capability parameters of AC-DC electric-drive system, under the train"s running state, such as traction dynamotor"s voltage/ current, pulling power and train velocity, then makes a research in the ideal running characteristic and the adjust characteristic of dynamotor and the speed adjust characteristic of electromotor with the theory of AC-DC electric-drive.

本文针对内燃机车交-直电力传动系统，对机车运行过程中，传动系统的主要性能指标参数(如牵引发电机电压/电流、牵引力、机车速度等)及其关系进行分析；并运用交-直电力传动原理，对机车电力传动过程中牵引发电机的理想外特性、调整特性及牵引电动机的速度调节特性进行研究；通过参考东风7型内燃机车的性能、结构参数，运用Visual Basic对内燃机车交-直电力传动系统进行数学建模。

The plasma clearance or radio-iodinated acetyl LDL was almost fully blocked by a 50-folds excess of unlabelled acetyl LDL, but the latter only inhibited oxidized LDL clearance by about 5%.

同位素标记的AC-LDL在血浆的清除能够完全被50倍高剂量未标记的AC-LDL阻断，但同样剂量的未标记的AC-LDL仅能抑制OX-LDL在血浆清除的5%。

Three activated carbons having different surface areas, coconut-shell based, pelletized and bamboo-derived, were modified by mixing them with four thermoplastic precursors, poly, hydroxy propyl cellulose, citric acid, and fluorine-containing polyimide followed by heat treatment at 900℃ for 1h.

三种具有不同比表面积的活性炭—椰壳基AC-C、粒状AC-P和竹基AC-B分别与四种热塑性前驱体—聚乙烯醇，羟基丙基纤维素，柠檬酸，含氟聚酰亚氨混合后，在900℃热处理1h。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。