自积分式Rogowski线圈电参数对其频率特性的影响

Rogowski线圈具有结构简单、安装方便、检测灵敏度高、频带宽等优点。对于测量高频的脉冲电流的自积分式Rogowski线圈,灵敏度与频带宽度是衡量其性能的重要指标。在简单分析Rogowski测量原理的基础上,利用集中参数模型,给出了自积分式Rogowski线圈参数的计算公式以及线圈的传递函数。根据传递函数,利用Matlab仿真软件得到当电磁参数改变时线圈的幅频特性和相频特性。详细分析了自感、互感、内阻、分布电容以及取样电阻变化时对自积分式Ro-gowski线圈频带宽度的影响,为优化Rogowski线圈的设计提供参考。     

Experimental Study of Effect of Air Duct Structures on Heat Dissipation of Heating-Only Fan Coil

Heating-only fan coil(HFC) is one of the suited end users.which is not only compact but also highly efficient.And the major factors affecting the heat dissipation performance of HFC include leakage through coil bypass,distance between fan and coil,fan structure and air inlet type.Under natural air convection or forced,experimental studies were made on the effects of these factors upon the heat dissipation performance of HFC.The results show that:1)After reducing the leakage through coil bypass,the heat dissipation of HFC in-creases 16.9%under natural convection,and increases 8.3%under forced convection.2)After the distance be-tween fan and coil be raised from 23.2cm to 41.7cm.the heat dissipation of HFC decreases 21.3%under natu-ral convection,but increasesl2.8%under forced convection.3)After changing the fan structure,the heat dissi-pation of HFC increases 41.8%under natural convection.and the heat dissipation per motor power increases 96.1%under forced convection.4)The heat dissipations of HFC with round pass,slit and strip type of air inlet are different,whose proportion is about 100%,110%,136%under natural convection,and 100%,105%,116%under forced convection.     

基于分布式发射线圈的WPT抗偏移与互操作性研究

无线电能传输系统中接收端与发射端之间相对位置的偏移会在一定程度上影响系统传输效率,笔者从耦合机构的全范围抗偏移性、互操作性2个方面进行研究,提出一种多对一的耦合模式,发射线圈类型为平面分布式发射单元线圈组合,对不同的接收线圈类型、轴向偏移工况和旋转偏移工况的位置模态研究分布式发射线圈的开启模式,实现接收线圈的互操作性和大范围全方向的抗偏移性。为提高分布式发射线圈的自由度,提出分布式串联控制逻辑电路,并对发射线圈串联连接工况下的谐振参数进行设计以减少交叉耦合影响。结合分布式发射线圈的磁场特性和基于LCC-S谐振拓扑的拾取电压检测法,提出接收线圈位置检测的搜索策略。搭建实验装置,综合所有位置的轴向偏移及旋转偏移,平面式接收线圈的最大效率波动为3.3%,垂直式接收线圈的最大效率波动为5.57%,螺线管式接收线圈的最大效率波动为4.45%,实验结果表明,其具有良好的抗偏移特性与互操作性,验证了系统的可行性、高效性。