期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
基于电流分配方法的开关磁阻电动机速度控制研究 被引量:2
1
作者 王浩 王家军 高营 《机电工程》 CAS 2016年第8期984-990,共7页
为解决开关磁阻电动机的速度控制问题,借鉴交流电动机坐标变换的思想,将开关磁阻电动机的给定电流进行了坐标变换,然后再进行一系列的数学运算,可以获得开关磁阻电动机各相的参考控制电流。利用所获得各相参考控制电流对开关磁阻电动机... 为解决开关磁阻电动机的速度控制问题,借鉴交流电动机坐标变换的思想,将开关磁阻电动机的给定电流进行了坐标变换,然后再进行一系列的数学运算,可以获得开关磁阻电动机各相的参考控制电流。利用所获得各相参考控制电流对开关磁阻电动机的电流闭环方案进行了研究,提出了一种新颖的电流分配方法,实现了开关磁阻电动机的电流闭环控制。该控制方法既没有用到开关磁阻电动机的数学模型,也没有涉及开关角的运算。采用Matlab/Simulink对于电流分配方法进行了仿真研究,并在实验平台下进行了实验验证。仿真结果表明,该思路具有可行性;实验结果证明了设计思路的正确性和有效性。 展开更多
关键词 开关磁阻电动机 速度控制 电流分配方法 坐标变换
下载PDF
爆炸电子发射边界的粒子模拟实现
2
作者 卓红斌 胡庆丰 +1 位作者 常文蔚 徐涵 《强激光与粒子束》 EI CAS CSCD 北大核心 2003年第11期1068-1072,共5页
 介绍了自行研制的全电磁柱坐标粒子模拟程序的电流分配方法和金属爆炸电子发射边界的模拟实现,该电流分配方法满足电荷电流连续性方程,避免了繁琐的泊松修正,适用于复杂边界物理问题的模拟研究。基于此电流分配方法的基础上,给出了建...  介绍了自行研制的全电磁柱坐标粒子模拟程序的电流分配方法和金属爆炸电子发射边界的模拟实现,该电流分配方法满足电荷电流连续性方程,避免了繁琐的泊松修正,适用于复杂边界物理问题的模拟研究。基于此电流分配方法的基础上,给出了建立在高斯定理基础上的简单且易于程序实现的阴极发射边界算法。利用该程序对平面二极管电子发射现象的模拟结果证明了算法的正确性。 展开更多
关键词 粒子模拟 电流分配方法 爆炸电子发射 电荷电流连续性方程
下载PDF
Dynamic Overmodulation in the Synchronous Reference Frame for IPMSMs
3
作者 Junwoo Kim Sungyoon Jung Kwanghee Nam 《Journal of Energy and Power Engineering》 2013年第7期1398-1407,共10页
Overmodulation is frequently required during the transient interval at high speed operations of IPMSMs (interior permanent magnet synchronous motors). In this work, an overmodulation method is developed in the synch... Overmodulation is frequently required during the transient interval at high speed operations of IPMSMs (interior permanent magnet synchronous motors). In this work, an overmodulation method is developed in the synchronous reference frame with a provision of assigning different priorities to d- and q-axes currents. During the current boosting in motoring, the d-axis current is increased by priority for a fast current response, and to minimize the overmodulation period. However in the regeneration process, the q-axis current is decreased by priority during a load reduction. Simulation and experimental results show that the proposed method, compared with the existing minimum-phase error method, is better for a fast current response, and in shortening the overmodulation period. 展开更多
关键词 IPMSM INVERTER current controller and overmodulation.
下载PDF
Investigation of micro vortex generators on controlling flow separation over SCCH high-lift configuration 被引量:4
4
作者 CHU HuBing ZHANG BinQian +2 位作者 CHEN YingChun LI YaLin MAO Jun 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第7期1943-1953,共11页
For the problem that the flow separation on the flap lowers the aerodynamic performance of high lift system,an investigation was carried out on using micro vortex generators(VGs) to control the separation on flap of t... For the problem that the flow separation on the flap lowers the aerodynamic performance of high lift system,an investigation was carried out on using micro vortex generators(VGs) to control the separation on flap of the swept constant chord half-model(SCCH) high-lift configuration,at a small to medium angle of attack,by experimental and numerical methods.The basic flow characteristics of SCCH landing configuration were analyzed by using numerical method to provide required information for the design of micro VGs.Then,by keeping the cruise configuration intact,the preliminary design procedure and design methods of micro VGs were established.In addition,the micro VGs were designed.The effects of VG's arrangement and geometric parameters,such as the arrangement mode,chordwise position,arrangement angle,height and spanwise distance,on controlling efficiency were investigated by using numerical method.Then the parameters of preliminary VGs were adjusted as the basis configuration for wind tunnel test.The experiments were accomplished in NH-2 wind tunnel for validating the numerical method,as well as obtaining the design principles and methods of micro VGs.The parameters of VGs were also optimized based on the experiments.The experimental results showed that the numerical design method can serve as an efficient and accurate design tool.The lift and drag were increased by 10% and 14%,respectively in landing state,which satisfied the requirements for landing.Finally,it was concluded that the established design principles and methods for micro VGs in this investigation can be used in engineering application. 展开更多
关键词 micro vortex generators high lift system flow control numerical simulation wind tunnel test
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部