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In this paper, according to the theory of electromagnetic fields, firstly, electromagnetic field of large and medium asynchronous motor is calculated from the angle of coupled fields, secondly, the end voltage of the stator is taken as constraint condition and starting current in stator is iterated in the numeral computation process, finally starting current and starting torque at rated voltage are gained, and by comparing calculation results with test results ,starting performance of large and medium asynchronous motor meet the demand of project practice.

本文根据电磁场理论，从耦合场的弱耦合角度首先计算了大中型异步电动机的电磁场，在电磁场的数值计算过程中，以定子端电压为约束条件，对定子起动电流进行了迭代计算，得到了额定电压下的起动电流和起动转矩，并把正弦时变场计算结果与实测结果进行对比，表明大中型异步电动机的起动性能的计算结果满足工程实际的需要。

This test apparatus is able to measure the drain-source breakdown voltage, static drain-source on resistance, gate threshold voltage, forward transconductance and input capacitance of power MOSFET accurately, which has been applied in practice.

所设计的功率MOSFET测试仪可以进行功率MOSFET的耐压、沟道电阻、开启电压、跨导及输入结电容几个参数的精确测量，并已实用化。

When a transformer is supplied energy at a given voltage and delivers it at some lower voltage, it is called step-down transformer.

当变压器提供能源在特定的电压，并提供它在一些低电压，这是所谓的降压变压器。

High-voltage power distribution and the step-down transformer should regulate the electricity sector for the construction of the installation; Chai oil-fired units. UPS and low-voltage power distribution panels to be installed in accordance with the norms of telecommunications power.

高压配电所和降压变压器应按照电力部门的规范进行建设安装；柴油发电机组、UPS和低压配电屏的安装应遵照电信电源规范进行。

AC Power Supply System Communication Power Supply System exchanges generally are high-voltage power distribution, step-down transformer, Chai oil-fired units, UPS and low-voltage distribution screen composition.

通信电源的交流供电系统一般由高压配电所、降压变压器、柴油发电机组、UPS和低压配电屏组成。

For a step-up transformer, the output voltage is HIGHER than the input voltage.

对于一个升压变压器，输出电压高于输入电压。

Otherwise, because of the limitation of IGBT's specified voltage, we must use special step-up transformer, which is more expensive, if we put this device into high voltage power system.

另外，由于补偿装置中IGBT模块的额定工作电压的限制，若要将其运用于高压系统需要连接特殊的升压变压器，成本较高。

Powerformer, launched in 1998, is a high voltage synchronous machine that is suitable for direct connection to the high voltage network without any step-up transformer.

Powerformer是一种高压发电机，可以直接和高压母线直接连接而无需升压变压器进行升压。

When the power system load in a small disturbance, the system itself to maintain the stability of the power transmission capacity, the use of automatic excitation regulator device may reduce the reactance of the generator, and then further to maintain the transformer high-voltage bus voltage constant, so compensation not only its own reactor, but also compensation for the step-up transformer reactance, thus greatly improving the power limits of generators, which greatly increased the static stability of power system.

当电力系统的负载发生微小的扰动时，系统本身保持稳定送电的能力，使用自动励磁调节装置，则可减小发电机的电抗，再进一步维持变压器高压母线的电压恒定，这样不仅完全补偿了自身的电抗，而且还补偿了升压变压器的电抗，这样就大大提高了发电机的极限功率，即大大地提高了电力系统的静态稳定。

BUCK circuit for a buck or step-up transformer, the output voltage v0 is greater than or less than the average input voltage U opposite polarity, capacitance transmission.

BUCK电路一降压或升压变压器，其输出平均电压v0大于或小于输入电压U极性相反，电容传输。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。