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Feb 09, 2018Open Access
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 Access
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 Access
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 Access
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 Access
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 Access
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 Access
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 Access
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 Access
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 ...
Nov 11, 2016Open Access
Experimental results of linear and curved conducting thin wires’ disintegration under high power but low energy electrical discharges are reported. Microscopic origin of the anomalous energy release is traced into the lattice interaction with the strong transient radiation field causing the appearance of a strong Stark effect out of the polarization of the metallic surface. The possible role of the wire curvature is also explored ...
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