Nikola Tesla — The creator of the electric age

Nikola Tesla was one of the greatest inventors of all times. He can be placed along with Faraday and Edison as a prolific inventor who touched on almost every aspect of electricity. In fact he invented electricity as we know it today and hence ushered in the modern age. Anil K Rajvanshi is a mechanical engineer by profession. He was educated in IIT Kanpur and did his PhD from the University of Florida, Gainesville, in 1979. He has more than 25 years of experience in rural development and runs a rural NGO called Nimbkar Agricultural Research Institute in Maharashtra. Besides his technological work he also has interests in issues of technology and spirituality and writes extensively on this subject.     

交流电路分析与相量法的教学体会

交流电路分析经常使用相量法,但初学电路的学生往往较难理解相量的概念,甚至对相量法运算的结果会有所怀疑。本文对相量法的教学方法进行了探讨,先引入仿真实例给学生建立初步印象,再补充公式推导说明相量法的本质,帮助学生理解相量法的概念,最后结合相量法的历史来吸引学生的兴趣。作者采用本文所述的方法,在近几年的教学实践中取得了较好的效果。     

利用TMS320F240实现异步交流电机的直接转矩控制

本文提出了一种基于数字信号处理器(TMS320F240)的异步交流电机直接转矩控制系统.通过研究异步电机直接转矩控制原理.给出了系统硬件框图;最后对系统进行了实验.实验结果表明系统能够实现电机快速动态响应这一特征且在交流调速中具有一定的实用价值.     

基于数字信号处理器的电机伺服控制系统研究

电动机的伺服控制在数控系统中处于重要的地位．本文首先对交流感应电动机的伺服控制系统进行了研究．提出并开发了一种基于数字信号处理器的16位全数字交流伺服控制系统。     

静电复印机的AC驱动器维修及电路的改进方法

介绍静电复印机AC驱动器的维修经验并提出用固态继电器对原电路进行改进的方法.     

Aharonov-Casher Oscillasions of Transmission Through a Mesoscopic Ring with a Magnetic Impurity

Aharonov-Casher oscillasions of transmission through a mesoscopic ring with a magnetic impurity is investigated. Both spindependent transmission and reflection coefficients of spin-state electrons at zero-temperature are calculated as a function of the textured electric fields and its title angle in the present of spin-flipper scattering. It is found that the spin-exchange interaction can destroy intermittently periodic oscillations of spin-up transmission and reflection coefficients within some small ranges in the adiabatic region of quantum phase. However spin-down transmission and reflection coefficients appear periodic AC oscillations. The calculated results manifest that spindown transmission and reflection coefficients have the same perfect oscillation patterns. In the nonadiabatic region, the behavior of the anomalous AC oscillations are depedent on the difference between the tilt angle of spin and that of texture electric field.     

一种自耦变压器降压起动控制线路的改进

分析了一种自耦变压器降压起动控制线路存在的弊病,并对此进行了改进,介绍了改进后控制线路的工作原理。     

便携式蓄电池内阻检测装置的设计

蓄电池内阻是评价蓄电池好坏的一个重要参考指标。提出了低频交流注入法测量蓄电池内阻便携测量装置的设计方法,介绍了该测量装置的原理和实现电路。实验表明：该装置具有性能可靠、精度高、结构简单、成本低廉等优点,具有良好的实用价值和推广意义。     

Single-stage active clamp power factor correction AC/DC converter

A simple single-stage AC/DC converter circuit with active clamp is presented. The operation theory and state are analyzed. The experimental results show that the voltage across main switch can be clamped to a certain value,and zero voltage switching (ZVS) can be achieved. The voltage stress and switching loss are both decreased. In range of the whole load,power factors can be always more than 97%,and the highest efficiency can reach 88%.     

The legacy of Nikola Tesla

Electrical power supply has grown enormously during this century. In 1950 the total capacity of generators producing electricity in India was less than 3000 MW. Today, the power generating capacity is around 120,000 MW. The polyphase AC system, which is to a large extent the legacy of Nikola Tesla, is central to all power generation. Power systems these days are complex interconnected networks spread across the country. How are they structured? How have we been doing in India?