| 1. | In the field of ac machines control , a strategy called variable frequency control is mostly used
在交流调速领域中，应用最广的是变频调速技术。 |
| 2. | Specifications for withstand voltage test on stator coil and winding insulation of high voltage ac machines
高压交流电机定子线圈及绕组绝缘耐电压试验规范 |
| 3. | This book is a monograph on not only the ac machines but also the systems related to the machines , besides analysis methods and operating performances are stressed in the book
本书就是以交流电机为主体阐明交流电机及其系统分析的专著，着重于分析方法和运行性能的研究。 |
| 4. | So now direct torque control has become an emphasis in the field of ac machines control . some simulation and experiment researches about this strategy are presented in the paper
因此目前该技术已成为交流调速传动中的一个热点，本文就是针对这一技术进行了一些仿真和实验的研究。 |
| 5. | The high performance of dc motor can reached by ac machine because of vector control , for which fo is crucial . but fo depends on the correct setting of motor parameters
矢量控制技术要使感应电机达到与直流电机相同的调速性能，准确获得磁场定向是关键，而磁场定向又依赖于电机模型参数的设定。 |
| 6. | After vector transformation control is presented , the ac machines control technology can theoretically solve the problem on the static and dynamic performance relative to the dc technology
继1971年矢量变换控制技术出现之后，交流传动技术就从理论上解决了交流调速系统在静、动态性能上与直流传动相比所存在的问题。 |
| 7. | This system take the industry computer and the programmable controller as a control core , step - motor , the frequency changer and the ac machine does for the execution , matches by the sensor and its the periphery connection electric circuit , formed a pair the closed - loop control system
本系统以工业计算机和可编程控制器为核心,步进电机、变频器与交流电机做为执行器,配以传感器及其外围接口电路,构成双闭环控制系统。 |
| 8. | In order to analyze the characteristics of stator ground fault and develop its protection schemes , a mathematical model for large - sized hydro - generators is established based on the multi - loop theory of ac machines and considering the capacitance to ground and actual construction of the stator windings
为了详细分析大型水轮发电机定子绕组单相接地故障特点，校验和开发相应的保护方案，本文建立了以交流电机多回路分析方法为基础、考虑定子绕组对地电容、采用实际绕组结构的发电机定子绕组单相接地故障仿真模型。 |
| 9. | With the development of science and technology more attentions have been concentrated on the performance analysis of the following systems : variable speed drive system of ac machines with power electronics and control devices , power energy system composed of ac machines and power lines , electric machine system consisting of ac machines and excitation control devices
随着科学技术的发展，交流电机与电力电子及其控制装置组成的调速传动系统、交流电机与电力传输线组成的电能系统、交流电机与励磁控制装置组成的电机系统等的性能分析越来越受到关注。 |
