查询词典 commutation

The validity of the method is demonstrated by comparison with results obtained from tests on a practical drive system. The influence of damper winding on performances of self-controlled synchronous motor, especially on commutation process and commutation limit, are analyzed in detail. It is shown that damper winding has little effect on increasing overload capability. The influences of field winding on torque, commutation process and overload capability are analyzed also.

然后在此基础上，分析了阻尼绕组和励磁绕组对自控式同步电动机性能的影响，包括对电磁转矩、换流过程和过载能力的影响，重点分析了阻尼绕组对换流过程和换流极限的影响，讨论了阻尼绕组在自控式同步电动机中的作用，得出阻尼绕组对提高过载能力作用不大的看法。

Control complex, easy to implement intelligent, and its electronic commutation is flexible, square wave commutation or sinusoidal commutation.

控制复杂，容易实现智能化，其电子换相方式灵活，可以方波换相或正弦波换相。

Then, flaw of existing full-digital voltage commutation method is pointed out after the change of the critical area which switch sequence will encounter corresponding to the variety of displacement angle at the input-side of converter has been explicated, then several rules have been presented and used to instruct detailed voltage commutation method built. Increment of switches' commutation-times, thanks to the new method employed, is analyzed in succession.

通过分析输入侧功率角变化对矩阵变换器全数字电压换流技术的影响，指出现有全数字化电压换流方案的缺陷，并提出新的改进原则，接着给出详细的数字化电压换流策略实现方法，分析新方法对变换器换流次数的影响。

Commutation failure is one of the most frequent faults in AC/DC systems and continuous commutation failures will lead to closedown of DC system.

换相失败是交直流输电系统最常见的故障之一，连续的换相失败还会引发直流闭锁，影响系统稳定运行。

Also introduced 3 kinds of methods to serve as a frequency domain data to change the theoretical foundation that is time domain data at the same time, namely law of Fourier progression law, fast Fourier commutation and Chirp-z commutation law, made corresponding assessment to these 3 kinds of methods.

同时也介绍了3种方法作为把频域数据转换为时域数据的理论基础，即傅里叶级数法、快速傅里叶变换法和Chirp-z变换法，并对这3种方法作了相应的评价。

In the paper, a back commutation mathematical model based on heat restrike is built according to the interrupting process. Solving differential equations for the mass, momentum and heat balance, the back commutation of low voltage current limiting circuit breaker is simulated.

根据实际开断物理过程，建立了以热击穿为主的背后击穿物理模型，运用气流场，结合热场、磁场与电流分布，计算模拟了低压限流断路器在开断过程中电弧运动状况与背后击穿现象。

The keystone of this device as follows : input three phase AC power supply of 380V±15%, become DC after primary full-bridge commutation wave filter, convert high frequency AC pulse of over 20KHZ using IGBT inverter module, become DC power supply for the usage of producing ozone after step-up of High Frequency Transformer and commutation of quickness rectifier tube and reactor.

高频高压臭氧发生装置的基本原理是：输入380V±15%三相交流电源，经初级全桥整流滤波成为直流，通过IGBT逆变部件，转换成20KHZ以上的高频交流脉冲，再经高频变压器升压，最后由快速整流管、电抗器整定为可供发生臭氧用的直流电源。

This is referred to as trapezoidal commutation or block commutation.

这被称为梯形换相或阻塞换相。--不理解

The optimal design and topology commutation can been carried out automatically on the various types and scales of humps through using the comer increment method, the method of point intersection of trochoid and topology commutation method.

用转角增量法、限界轨迹线交点判别法及本文提出的咽喉区网络结构图自动拓扑变换方法实现了各种类型、各种规模驼峰头部和调车场尾部平面图的优化设计和自动拓扑变换。

Because on the turnplate axis power is by the turnplate under after the bevel gear commutation, decelerates transmits, moreover their velocity ratio is 6, also because the bevel gear velocity ratio is not bigger than 3 generally, therefore has designed two axes, by realizes the bevel gear two commutation, decelerates.

因为转台上的轴动力是由转台下经锥齿轮换向、减速传来的，而且它们的传动比为6，又因为锥齿轮的传动比一般不大于3，所以多设计了两根轴，以实现锥齿轮的两次换向、减速。

"Second Life is remarkably easy to work with, and is very popular,"

"第二次生命是显着容易的工作，并且很受欢迎，"

For example, we usually assume that materials are homogeneous and isotropic and free of internal defects or flaws.

为了得到适合有限元分析的模型，我们必须经过如图2所示的简化步骤。