换相

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。

The cause, harm and measures for prevention from the commutation failure has been analyzed in this paper .

本文从理论上详细分析了换向失败的机理，简明阐述了引起换相失败的原因、危害以及预防换相失败的措施。

Research on commutation failture in HVDC transmission system part 1:analysis on influence factors of communication failure.

直流输电系统换相失败的研究：换相失败的影响因素分析。

The research progress of commutation failure is reported.

详细分析了目前国内外直流输电系统换相失败问题的研究现状，综述了换相失败的发生机理、研究方法和预防措施。

This paper discusses the principle of the torque ripple of BLDCM with focuses on the theoretical analysis of the relationships between torque ripple and parameters of windings,motor speed and bus voltage,as well as 3-phase reverse electrodynamic potential during phase converting.

对永磁无刷直流电机的换相转矩脉动的产生机制进行了分析，主要从理论上探讨了换相引起的转矩脉动与电机绕组的参数、换相期间的三相反电动势、电机的运行速度及母线直流电压等之间的关系。

A new type of topology is made to improve the current commutation performance by mutual inductance.

提出了一种可以改善SR电机换相性能的新型互感换相型拓扑结构。

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。

The results of theoretical analysis and simulation indicate that commutation converter based on New-Type converter transformer-Filter Commutated Converter have superiority on harmonic characteristics.

理论分析和数字仿真结果均说明了基于新型换流变压器的换相换流器—滤波换相换流器在谐波特性方面的优越性。

The relationship between currents of Filter Commutated Converter and the harmonic characteristics of multifrequency AC/DC interconnected systems based on New-Type converter transformer have been studied with ideal models by means of theoretical analysis and matlab simulation.

采用理想化的研究方法，通过理论分析和MATLAB仿真对滤波换相换流器的电流变换关系以及基于新型换流变压器的多基频交直流互联系统的谐波特性进行了系统的研究。理论分析和数字仿真结果均说明了基于新型换流变压器的换相换流器—滤波换相换流器在谐波特性方面的优越性

Based on analysis of solidified structure of aluminium strip in different laboratorial conditions, the effect of commutating period on grain refinement.

通过对不同试验条件下铝带坯宏观组织的分析，探讨了换相周期对铸轧带坯晶粒细化的影响，试验结果表明：换相周期在电磁快速铸轧工艺中是一个重要的电磁参数，当换相周期数为1，电磁场频率为13Hz时，晶粒细化效果最好。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐