OALib 期刊
  OALib Journal (ISSN Print: 2333-9705, ISSN Online: 2333-9721)是一本多合一的开源期刊,以同行评审的方式出版发行文章,其所涵盖的研究领域多达311种领域。本刊发表的全部文章均可在期刊网站上免费阅读、下载、引用和传播。单篇文章出版费用为99美元。详情请咨询service@oalib.com现在就去投稿!
               文章 | 目标与领域 | 读者指南 | 编委 | 文章版面费检索             


Go

Feb 13, 2018Open    AccessArticle

Using Three Op Amp Simple AM/FM Radio Circuit

Min Jiang
After nearly a year of probation, the type of AM radio repeater circuit in general can be retrieved in a number of local radio stations; the installation is convenient, the output has a loud voice, and bass is rich, which make it indeed a good choice for beginners’ homemade radio circuit. Beginners can give radio principle about double harvest theory and practice. The whole circuit fabrication costs low. The AM circuit is
...


Feb 09, 2018Open    AccessArticle

Design of Drive System for Sensorless Brushless DC Motor Based on Model Reference Adaptive Control and Its Application in Horizontal Well Tractor

Zhou He, Yongjun Chen, Bo Ruan, Shuhan Yu, Junwen Zhou
The actual working environment temperature of the horizontal well tractor is too high, which leads to position sensor of general brushless DC motor (BLDCM) cannot work normally. Therefore, the position sensorless drive system is designed to overcome the problems caused by the position sensor in the actual working conditions. The principle of sensorless BLDCM work is introduced in detail, And drive system of Sensorless B
...


Jan 30, 2018Open    AccessArticle

Evolution of the Brazilian Electric Generation System and Its Exergetic Efficiency-Relations with Economics, Reviews and Projections

Marcus Vinicius da Silva Neves
In general, historically, Brazil is a country that does not develop a robust master plan for various areas responsible for supporting its development. As for the themes: education, transport, logistics, tourism, among others, the national infrastructure, in which the generation of electricity is a main character, does not have a strong planning and is pursued firmly that its actions come true. In addition, there is no clear driver
...


Dec 28, 2017Open    AccessArticle

Research on Permanent Magnet Synchronous Motor Driver System of Horizontal Well Tractor

Zhou He, Yongjun Chen, Shuhan Yu, Junwen Zhou, Yang Shen, Kuan Shi
Nowadays, horizontal well technology is being applied to the development of oilfield production capacity more and more. The horizontal well tractor can effectively solve the problem that the instrument can not get to the target layer by gravity. However, in actual conditions, Brushless DC motor (BLDCM) there is a large torque ripple problem, resulting in motor running is not smooth, vibration and noise is too large, can not meet t
...


Nov 23, 2017Open    AccessArticle

Study on Low Temperature Performance of Li Ion Battery

Kejie Wang
At low temperatures, especially when the temperature drops to -20 degrees, or even lower, the energy and power of lithium ion batteries are obviously decreased by [1] [2] [3] [4] [5]. In order to further grasp the lithium ion power battery charging characteristics at low temperatures and low temperature discharge performance test bench experiment simulates the low temperature environment, so as to ascertain the low charge discharg
...


Sep 14, 2017Open    AccessArticle

A New Strategy for BLDC Sensorless Control System and Its Application in Horizontal Well Tractor

Shuhan Yu, Yongjun Chen
The positionless brushless DC motor has the advantages of simple structure, good speed performance and high efficiency. It has become the best choice for horizontal well tractor. This paper introduces a set of brushless DC motor control system, gives the hardware structure of the system and brushless DC motor without Hall sensor control flow chart and the host computer communication interface protocol which solves the problem of p
...


Jul 21, 2017Open    AccessArticle

Review on the Coordination and Energy Management of Microgrids Broad Based on PQ Controller and Droop Control. Some Useful Information Is Given in This Paper

Aphrodis Nduwamungu
The integration of distributed Energy Resources (DER) is challenging electrical network quality which is the main vital and ubiquitous all over the world. Coordination and energy management of microgrids in grid connected and in islanded mode is one of solutions of distribution power quality with best reliability, and stability to ensure power system resilience. In this review, the coordination and energy management of microgrids
...


Jun 20, 2017Open    AccessArticle

Design of the Brushless DC Motor Driving System Based on STM32

Haoran Jin, Xiang’e Sun
As a mechanical and electrical integration product, brushless DC motor has better controllability and wide speed range. According to its characteristics, a brushless DC motor control system based on STM32F103ZET6 MCU is designed and realized, and then the control system was analyzed and discussed. Adopted GPIO module, PWM module, timer module, etc., coupled with efficient PID algorithm, three main functions of this system have bee
...


May 03, 2017Open    AccessArticle

Design and Development of Maximum Power Point Tracker for Solar Module Using Microcontroller

M. Tabassum, M. A. Aziz Jahan, N. Jahan, M. M. Rahman, M. N. Sadik
The main objective of this paper is to design and develop a Maximum Power Point Tracker (MPPT) for solar modules using microcontroller. Maintaining a solar panel or an array of panels without an MPPT will often result in power loss, which in return requires installing more panels for the same power requirement. This will also result in premature battery failure or capacity loss. This is why the controllers of all solar power syste
...


Jan 20, 2017Open    AccessArticle

Testing through Fall of Potential with High Current Injection in Grounding System in Transmission Line of 500 kV of Santo Antonio HPS

Carlos Magno B. Araújo, Luiz H. P. C. Trondoli
This paper presents the application of grounding resistance measurement by fall of potential with high current injection, applied to the Transmission Line (TL) of 500 kV of Santo Antonio Hydroelectric Power Station (HPS), located in the city of Porto Velho/RO, for the commissioning of the power house grounding system in Generation Group (GG2) and TL during construction of the referred project. Based on measurements obtained in fie
...


Go