the aim of this paper is making two motors to achieve synchronous operation, and making an excavator to work in the best operating conditions through the frequency control technology of asynchronous motor and the use of digital pid to control the two motors.

1、

this paper introduces a new algorithm of spwm sequence used in the ac motor's vf sr system with microcomputer, in which regular sampling can be improved.

介绍了计算机控制的交流电动机变频调速系统SPWM序列的一种新算法。该算法改进了规则采样法。

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2、

discussion is made on the principle of developing squirrel cage three phase induction motor frequency converter system by means of plc and frequency converter with the conclusion under pi controller given.

给出了用可编程控制器、变频器来实现鼠笼式三相异步交流电动机变频调速系统的机理，并给出在PI控制器下的结论。

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3、

it adopts scr with large power to establish the voltage adjustment circuit, so the ac motor can be started with low voltage.

它采用大功率的SCR组成电压调节电路，这样交流电动机就可以低压起动。

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4、

realization of profibus in the ac motor variable speed drive system

PROFIBUS在交流电动机变频调速系统中的实现

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5、

ac motor dtc system based on fpga and cordic algorithm

基于FPGA和CORDIC算法的交流电动机直接转矩控制

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6、

design of ac motor servo control system based on fpga

基于FPGA的交流电动机伺服控制系统的设计

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7、

realization of ac motor vector control based on dsp

交流电动机矢量控制的DSP实现

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8、

it mainly is insist of ipc ( industry process computer), intelligent regulator ( ir), programmable logic controller ( plc), frequency-converter and alternating current motor.

本系统主要是由工控机（IPC）、智能调节器（IR）、可编程控制器（PLC）、变频器、交流电动机等组成的。

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9、

now waldemar , whyn't you come clean and tell him what's on your mind?

沃尔德马,你干吧不把心里话竹筒倒豆子,一齐讲给他听呢 ?

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10、

the great bulk of the work was handled by jerry greenwald and steve miller.

大量的工作是由杰里·格林沃尔德和史蒂夫·米勒去做的.

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11、

the stately manor in the cotswolds transformed into her dwelling upon marrying an aristocrat.

这座位于科茨沃尔德的庄严宅邸在她与一位贵族联姻后变成了她的居所。

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12、

that is, the transactions of data and technology are interconnected, first regional and then nationwide.

即将各园区的信息、技术产权交易连通, 先区域后全国.

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13、

ip owners are able to prevent parallel import by means of contracts.

知识产权人可以通过合同来对防范平行进口.

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14、

d . contract signing the owner side and the certificate of property ownership were the same.

合同签字(房主方)与产权证的产权人相同.

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15、

survey the world, the company ushers in continuously the international popular residence repairs, new assembly concept.

放眼世界, 公司不断引进国际流行的住宅装修, 新装配概念.

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16、

belief is all the more beggared when you look at the wider world.

然而他们放眼世界时,信心就尽失了.

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17、

the play has gained good audience responses since its premiere in 2007, and has toured across asia, giving more than 80 performances.

该部话剧自2007年首演以来，便深受观众喜欢，目前话剧“红玫瑰与白玫瑰”已经在整个亚洲累计巡回演出达80余场次。

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18、

automobiles are the most common means of delivery.

汽车是最常见的运载工具.

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19、

the workers were alloted new delivery vehicles.

工人们被配置了新的运载工具.

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20、

to unload ( a vehicle or container ).

卸载,卸(货) ( 从运载工具或集装箱中 ) 卸下(货)

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