Thales公司为“阵风”、A400M和“守望者”无人飞机研制航电设备

来自法国、英国、美国和欧洲的A400M空中运输机项目的合同似乎再次证明了Thales公司的“多国”防御市场策略的明智。     

航天器贮能飞轮的发展与应用

介绍了一种替代航天器传统化学蓄电池的新概念电池-贮能飞轮,具有比能量、比功率大,寿命长,免维护、无二次污染的优点。论述了基于无位置传感器控制永磁同步电机/发电机的电磁悬浮贮能飞轮组成、电动机/发电机能量转换控制原理、关键技术和未来发展方向。     

有源带通滤波器

本文讨论由低通，高通滤波器累接起来的带通滤波器。     

自调节模拟低通滤波器的研究

通过对有源低通滤波器，频率／电压转换器AD650及其变容二极管的特性分析，提出由信号频率来自调节有源低通滤波器截止频率的新设计方案，并对其可行性进行了分析和研究。     

微波FET有源倍频器的工程设计

介绍了一种微波FET有源倍频器的工程设计方法，采用该方法研制的Ku波段五次倍频器具有倍频效率高、温度稳定性好的特点，适合于星载应用。     

Characteristics of motorized spindle supported by active magnetic bearings

A motorized spindle supported by active magnetic bearings（AMBs） is generally used for ultra-high-speed machining. Iron loss of radial AMB is very great owing to high rotation speed, and it will cause severe thermal deformation. The problem is particularly serious on the occasion of large power application, such as all electric aero-engine. In this study, a prototype motorized spindle supported by five degree-of-freedom AMBs is developed. Homopolar and heteropolar AMBs are independently adopted as radial bearings. The influences of the two types of radial AMBs on the dynamic characteristics of the motorized spindle are comparatively investigated by theoretical analysis, test modal analysis and actual operation of the system. The iron loss of the two types of radial AMBs is analyzed by finite element software and verified through run-down experiments of the system. The results show that the structures of AMB have less influence on the dynamic characteristics of the motorized spindle. However, the homopolar structure can effectively reduce the iron loss of the radial AMB and it is useful for improving the overall performance of the motorized spindle.