调速

The symmetric space voltage vector realized by TMS320F240 in software is introduced.

介绍了TMS320F240用软件生成对称空间电压矢量的方法，特别是针对高精度V/F值控制的应急通风机对交流变频调速的要求，通过检测直流侧电压实现对输入电压波动的前馈补偿，以提高输出电压精度，改善输出电流波形。

The second type of variable speed system is designed to make the motor have wide speed range and high precision.

第二类系统是针对要求有高精度控制及宽调速范围的应用场合而设计的。

Meanwhile, more and more machinery have adopted grade of MW variable speed drive system.

同时，这些机械越来越多的采用了兆瓦级调速传动系统。

The performance of AC variable speed drive system has been improved greatly since field-oriented control is applied.

矢量控制使交流调速系统的性能产生了质的飞跃。

In this paper, beginning with the basic equations of hydrodynamics, turbine and governing system, the author deduced the basic equations of transient process caused by small fluctuation in the inclined ceiling tailrace, then analyzed and calculated the basic equations.

从水力学、水轮机、调速器的基本方程出发，推导了变顶高尾水系统小波动过渡过程的基本方程，并对其进行分析与求解。

According to the request of adopting advanced technology, the main designing has such contents as below:⑴ Designing the two-fluid nozzle that is based on the theory of air-atomize spraying.⑵ Designing and choosing the type of the axial fan that is used to supply assisted airflow to waft droplets that comes from nozzle.⑶ Designing the swaying outfit that can rotate the spray assembly at a speed and inside a angle in order to satisfy the spray request of different crops, different planting states and improve the uniformity of distribution, the deposition of droplet. Here, we select TYV type reduction gear motor to adjust the swaying speed and use course switch to adjust the swaying angle.⑷ Designing the lift outfit that can adjust the height of the spray assembly to satisfy the request of the crops of different tallness, different spraying range. Here, we select cylinder as the main component that can be used as kickstand and controlled easily.⑸ Designing the switch of the power supply that is put out of the greenhouse in order to prevent worker from poisoning. After the mist sprayer being made, the experiment is made to test the function of the greenhouse mist sprayer fully.

根据采用先进施药技术的要求，本研究的设计内容主要有：⑴采用气液两相流喷雾技术，基于气力雾化原理，设计双流体喷头；⑵采用辅助气流输送雾滴，气流源为风机，对风机进行设计、选型；⑶为满足不同作物、不同栽培情况及提高雾滴分布均匀性、沉积性的施药要求，设计能带动喷射部件在一定角度内、以一定转速的旋转摇摆机构，本研究选用调速电机调节其摇摆速度，并利用反向行程开关调节其摇摆角度；⑷为满足不同高度作物、不同射程的施药要求，设计能调节喷射部件高度的升降机构，这里选用气缸为主要构件，既可以起到整机支架的作用，又可方便进行升降、固定控制；⑸设计行程开关的控制电路以及整机的控制系统。

The company has a number of years of rich experience in the engineering and technical personnel, through technological innovations, developed a 180-type aircraft terminal stepless speed regulation, and its performance and shape are unique.

本公司拥有一批具有多年丰富经验的工程技术人员，经过技术革新，开发出了一种180型多功能无级调速端子机，它的性能和造型都是独一无二的。

The proposed design and the analysis theory can also be applied for pulverized coal feeding system in other thermo power plant.

本文为变频调速技术在电厂中的应用提供了设计方法和理论依据。

This program contains a variety of three-phase induction motor speed control simulation, want to be useful to everyone.

详细说明：此程序内包含三相异步电机的调速各种仿真，希望对大家有用。

Solenoid valve and the throttle valve composed of two short forms.

新型调速阀的原理及应用它由定差减压阀、电磁换向阀和两个简式节流阀组成。。。

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％。