查询词典 inverter

Based on the DM model of the three-phase four-leg inverter, the DM performance of SPWM jump-edge delay strategy is analyzed. Its DM performance becomes worse because of the alteration to the local volt-second equivalent between the pulse and sine wave.

虽然SPWM跳变后移策略会使三相四桥臂逆变器获得最佳的共模输出特性，但因它改变了脉冲局部与正弦波的伏秒等效关系，导致逆变器差模特性变差。

ABSTRACT Introduces three methods that can adjust refrigerating output according to the variation of load aimed at the varying duty condition during the practical operation process of refrigeration system,frequency inverter technique,parallel unit with several compressors and liquid refrigerant storing method.

摘 要针对制冷系统实际运行过程中存在的变负荷工况，介绍三种根据负荷变化调节制冷量的方法：变频技术、多机并联压缩机组以及液体制冷剂储存方法。

The smooth operation of such valves, transmission, high efficiency, inverter control can be realized.

此类阀门的运转平稳，输送效率高，可实现变频控制。

Tension Control of the book's introduction, from the tension control Uncoiler principle, characteristics, classification, function and implementation are described; vector transformation from the basic principles of control, inverter control technology boards T400 model and outlines the aspects of how to control the tension the problem; In addition to the tension control roller load balancing and analysis were summarized, the principle of load balancing, sorting and implementation.

有关开卷机张力控制的介绍，从开卷机张力控制的原理、特点、分类、作用及实现进行了阐述；从矢量变换控制的基本原理、变频器的控制模式及T400工艺板方面概括了张力如何控制的问题；另外对张力辊的负荷平衡控制进行了总结和分析，有关负荷平衡的原理、分类和实现。

Companies continuously improve existing products in the technical level, has started the introduction of foreign technology, the development of polyvinyl chloride pipe production equipment, aluminum veneer production line, with no air shaft plate, floating roller tension, automatic AC inverter Technology, PLC touch-screen control of the domestic first-class new generation of concave printing presses.

公司在不断提高现有产品技术水平的同时，已经着手引进国外技术，开发聚氯乙烯管材生产设备，铝单板生产线，无轴气动装板、浮辊张力、全自动交流变频技术、PLC触摸屏控制等新一代国内一流凹印刷机。

Circulating current through a resonant tank circuit and inverter switches is reduced by feeding high frequency current back through a line inductor.

通过经过一个线路电感线圈将高频电流反馈，可以降低经过一个谐振储能电路和变换器开关的循环电流。

The series resonance type fault current limiter has the advantage of simple operating principle and topological structure etc. It may be designed with serial compensation following the condition of the electrical network. However, from the simulation, we draw the conclucion: in the process of restraining fault current after a fault occurrence in electrical network, capacitor and parallel inverter switch will stand for poor working condition.

串联谐振式限流器具有工作原理、拓扑结构简单等优点，并且可以根据需要设计成带串补型，但通过仿真分析得出：其在电网发生短路故障进入短路限流工况过程中，其电容器及并联转换开关将工作在相当恶劣的条件下。

The intelligent inverter cap energy storage spot welding machine with waveform control was developed. The structure theory and result of experiment were supplied.

本文提出了将储能点焊和逆变技术相结合的设计思想，研制出了&波形控制的逆变式电容储能点焊机&，并给出了主要结构原理及其试验结果。

That is the intelligent inverter cap energy storage spot welding machine with waveform control developed could run independently without any industrial computer controlling system.

即研制的&波形控制的逆变式电容储能点焊机&还可以完全脱离工控机控制系统而独立运行。

And this paper introduced the principium, design ideal and approach of waveform presetting of waveform controlling at will The function of relevant hardware circuit controlling was design in this paper uses litter content RLC surge circuit in simulating the current signal of energy storage welding, and took it as Ug to control the inverter cap energy storage spot welding machine. It realized HFPEC resistance spot welding with hardware circuit and got the effect as good as the system controlled by industrial computer and realized the customization and the low cost of welding machine.

本文所设计的相应硬件控制功能，采用小容量RLC 放电回路来模拟输出储能焊过程的电流波形，由此作为电流给定信号直接控制逆变式电容储能点焊电源，实现了完全由硬件电路构成的高频脉冲电阻点焊，能够获得焊接设备的专用化和低成本化的结果，并且可以得到与工控机控制系统相当的焊接效果。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。