调速

Can realize stepless speed regulation, to meet the requirements of transmission machinery

可实现无级调速，满足传动机械要求

The cutting speed can be adjusted by stepless frequency conversion to suit materials in different hardness.

切削速度可以无级变频调速，以适应不同硬度材料加工。

It has advantages of advanced structure, smooth working, reliable, safe operation, convenient maintenance, stepless governing, high-efficiency production and etc.

它具有结构先进、工作平稳、可靠、操作安全、维修方便、能无级调速、生产效率高等特点。

Stepless speed regulation by the motor to obtain the required voltage, current, frequency.

使电动机获得无级调速所需要的电压、电流、频率。

Stepless speed regulation function could adjust and desing the working speed to improve working efficiency.

无级调速可以调整和设定压切速度，有利于提高效率。

The experiment result shows that the legible and perfect hump curve can be achieved under the stepless speed regulating.

实验结果表明无级调速可得到较理想的驼峰曲线。

It has advantages of advanced structure, smooth working reliable, safe operation, convenient maintenance, stepless governing, high-efficiency production and etc.

封口具有结构先进、工作平稳、可靠、操作安全、维修方便、能无级调速、生产效率高的特点。

The investigative object of the article is the stepless speed regulating system.

研究的对象是汽车空调风机的无级调速系统，该系统采用双闭环控制，内环和外环都采用模糊PI控制策略。

Frequency stepless speed control, reduced noise, high-speed from a more stable and reliable do.

变频无级调速控制，降低噪音，高速脱干更加平稳可靠。

The main concent include:(1) the modeling for IGBT, Diode, and three-level inverter system based on PSIM software package;(2) simulation and experiment were done for every subcircuit of the inverter, and analysis was given in the paper for three-level inverter.(3) designd the driving and protecting circuit for the IGBTs.

主要内容包括：(1)构建了基于PSIM软件包的IGBT、二极管模型；(2)构建了基于PSIM的三电平变频调速系统模型；(3)对系统中各个支路的电参数进行了仿真和实验，给出了系统的一般设计方法；(4)设计了一套适用于三电平逆变桥的IGBT驱动电路。

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％。