调速

In connection with the operation characteristics of the hoist-lower mechanism and frequence control is explained.

本文分析了该起升机构的运行特点，介绍矢量控制变频调速特性。

The paper presents an account of selection of frequency changer used for feeding pump of dense medium cyclone , effect of function of the frequency changer and the problems identified in its application.

介绍了重介质旋流器给料泵变频器的选择、控制功能的实现以及应用中的几个问题，说明了变频调速技术的优势和应用潜

Uses import PLC programmable automatic control, import frequency ,changer, stepless speed regulation.

采用进口PLC可编程自动控制，进口变频器，无级调速。

The frequency changer velocity modulation technology is technology and so on collection automatic control, micro electron, electric power electron, correspondence to a body high tech technology.

摘要变频器调速技术是集自动控制、微电子、电力电子、通信等技术于一体的高科技技术。

Currently, these test rigsadjust their speed mainly relaying on frequency changer set, direct currentdynamo or complete aero-engine.

目前，试验台的动力主要是靠变频机组、直流电机或用整台航空发动机作为动力来实现调速。

The high efficiency transistor development causes the frequency changer the construction cost more and more to be also low, from the cost and the performance considered selects PLC to the frequency changer control realization frequency conversion velocity modulation.

大功率晶体管的开发使变频器的造价也越来越低，从成本和性能考虑选用PLC对变频器控制实现变频调速。

In this system,the VVVF(variable voltage variable frequency) control method based on magnetic flux trajectory is applied.In the system,it is the target for the magnetic flux linkage polygon to be greatly approximate to the ideal magnetic flux circle.Considering such limitations as the low speed torque ripple,high speed real time and the working frequency of switching element,through the subsection synchronization control method by applying different numbers of magnetic flux linkage polygon for different frequency range,the perfect precision specifications for speed can be obtained.

系统采用基于磁通轨迹法的他控式变频调速方案，以磁链多边形尽量逼近理想磁通圆为目标，并考虑低速转矩脉动、高速实时性和开关元件的工作频率限制等约束条件，通过采用分段同步控制方式，在不同的频段采用不同的磁链多边形边数，使系统获得了优异的转速精度指标。

Full authority control of an electronic throttle provides a range of options for speed governing.

充分的权力控制的一电子节气门提供了一系列可供选择的调速。

Test results indicate that: AC VF drive can well meet the needs of load characteristics of GDR. It′s one of the best drive system for GDR.

试验结果表明：交流变频调速驱动能很好地满足岩心钻机的负载特性要求，是岩心钻机用比较理想的动力驱动方案。

In order to improve the robustness and anti-interference ability of induction motor variable frequency speed control system, an internal model control method based on neural network generalized inverse method is proposed.

为提高感应电机变频调速系统的鲁棒性和抗干扰能力，提出了基于神经网络广义逆系统的内模控制方法。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。