调速

In this paper, according to the equation of voltage vector of single-phase motor operating at symmetrical condition, author presents a new voltage-vector PWM method of variable frequency control for single-phase motor. In system, the voltage vector is used as a control parameter.

本文根据单相电动机对称运行时的合成电压矢量方程，提出了以合成电压矢量为控制量的单相电动机电压矢量式PWM变频调速控制方法，并进行了计算机仿真及制作了单相变频器。

It is well known that rotor parameters of induction motor are subjected to variability and hard to be measured, which will deteriorate performance of control systems based on the mathematical model depending upon rotor parameters, such as rotor flux oriented vector control system, indirect self-regulation.

由于工作原理和材料结构上的原因，异步电机的转子侧参数易变难测，因此所有建立在异步电机动态数学模型基础之上并且利用转子侧参数进行控制的调速系统都或多或少地受到转子参数变化的影响，例如广泛采用的按转子磁链定向的矢量控制系统。

This design introduced retakes courses machine the Ventilator velometer inject mold's design and the manufacture method.

本设计介绍了风扇调速器注射模具的设计与制造方法。

It contains establishing control model of this engine, the models are based on engine average value in time, they can be divided as intake manifold, engine dynamics, velometer section and other subsystem model of CBM engine. Besides these, it also contains model of sensors using in engine intake system and running detection, model of step motor using in driving throttle.

文章主体的内容包括建立发动机燃用变组分燃料的控制模型，建模的思路是采用基于时间的发动机平均值模型，其中分为进气歧管、发动机动力学、调速器等发动机各子系统模型，另外包括对发动机进气系统、运行参数进行检测的传感器模型以及驱动阀门的步进电机模型等。

The Red Sea has used the diameter is the 9cm static figure radiation ventilator, but pursues the static sound to play the family to be possible to purchase a ventilator velometer, the hand control ventilator's rotational speed adjusts between 1200-2200 rpm, ventilator's noise is also is situated between 15-25db10% differently according to the rotational speed, both has satisfied the radiation request, and may according to user's need, the adjustment wind speed realize the user static sound demand.

红海采用了直径为9cm的静音型散热风扇，不过追求静音的玩家可以购买一个风扇调速器，手动控制风扇的转速在1200-2200 rpm之间调整，风扇的噪音也是根据转速的不同介于15-25db±10%，既满足了散热要求，又可以根据用户的需要，调整风速来实现用户静音的需求。

Results of economical analysis on 6 modified furnaces in Qian′an,Fengrun and Baodi Stations show that 502116kW·h of electricity can be saved annually by using frequency conversion velometer,an investment of RMB250000 can be saved,and the payback period is around 1 year.

对改造后的迁安、丰润、宝坻3站6台加热炉进行经济分析可知，采用变频调速器，全年可节电502116kW·h，节约投资25万元，回收期约1a。

The wireless image acquisition module is made by CCD and video capture board, it takes the photos of road, transmit images to PC by FM. The control-command provided by PC is transmitted to MCU by communication module, which is composed of AT86S52 and PTR8000.These commands control the movement of AGV.

以无线CCD摄像头和视频采集卡为核心的图像采集模块采集路面图像以调频方式发送至计算机进行图像处理，并将计算的控制参数通过以AT89S52单片机以及PTR8000为核心的无线通讯模块传送至单片机调速系统，控制AGV小车的运动。

The paper analyzes the fundamental characteristics of walking beam reheating furnace"s velocity control system in theory, and exactly builds the mathematical model of walking-beam-type reheating furnace"s velocity control system by mechanics analysis. It analyzes capacity speed governing systems dynamic characteristic and anti-interference performance in load. It also simulinks the system.

本文从理论上分析了步进梁加热炉速度控制系统的基本特性，并通过力学分析比较精确的建立了步进梁加热炉速度控制系统的数学模型，分析了泵控容积调速系统的动态性能和抗负载干扰特性，并进行了仿真。

The system directly uses the frequency conversion velocity modulation way automatic control the speed of water pump motor, has saved the system investment.

系统直接采用变频调速方式自动调节水泵电机的速度，节省了系统投资。

Woodward was first established in 1870. Today there are 24 factories and offices around the world.

公司简介：伍德沃德调速器公司成立于1870年，目前在全球设有24个工厂和办事处。

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％。