Direct Current (DC) motors
A Direct Current (DC) motor is one of the broader classification of electric motors which operate from a direct current. Nearly all mechanical devices applied in daily life activities are powered by electric motors. Motors transform electrical energy to mechanical energy, hence they are essential for energy conversions in electrical machines.
All types of electrical motors are made up of a stationary field referred to a stator and a rotating field referred to a rotor. According to Krishnan, (2010), DC motors operate through the interaction of an electric current with magnetic flux to generate a torque and rotational speed. D.C motors are of different types but they all operate…
Multi-Objective LPO by Fuzzy Gravitational Search Algorithm in WWER1000
Authors: M. Aghaiea,*, S.M. Mahmoudib
a Engineering Department, Shahid Beheshti University, G.C, P.O. Box: 1983963113, Tehran, Iran
bFaculty of Electrical and Computer Engineering, Graduate University of Advanced Technology, Kerman, Iran.
Number of manuscript pages:
Number of figures:
Number of tables:
* Corresponding author
Fax: +98 21 29902546
Factors That Contribute to the Digital Divide
One of the crucial factors that contribute to the difficulty to spread technology and business to much of India is the lack of easy transportation. Of the over 1.34 billion people who populate India, 72.2 percent live in 638,000 villages while the remaining 27.8 percent live in only 5,480 towns and urban agglomerations (Population of India 2016, 2016). While urban cities have some paved roads and public transportation means such as…
and high output current with low ripple. An No isolation DC/DC converter Fig.1.1 shows the step-down DC/DC converter. When switch M is on for the duration of dTs, power is transferred from source to load and filter inductor L is charged. When switch M is off for a duration (1-d)Ts, the diode D becomes forward-biased and forms a conduction path for the filter inductor current. The voltage across the filter inductor is the reverse of the output voltage. By using filter inductor volt-second balance…
Power lines are a dangerous hazard and a safe alternative should be found. When power lines break due to weather, carelessness and other reasons, they become live wires that can be very harmful or even deadly. Bob Isiminger, senior electrical engineer in The Occupational Safety and Health Administration (OSHA) office of engineering and safety in Washington, D.C. says, "the most common injuries that are sustained when dealing with high voltage or when working on a construction site are caused by…
Abstract:It is very important to control the speed of induction motors in industrial and engineering applications. Efficient control strategies are used for reducing operation cost too.This paper presents a direct flux and torque control of three phase induction motor drive using PI and Fuzzy logic controller. The Direct Flux and Torque Control (DTC) is one of the most excellent direct control strategies of stator flux and torque ripple of Induction Motor Drive(IMD). The conventional method of…
includes 4 relays and these relays drive and direct accordingly to the motors that actuate the arm system. Implementation of such a system allows us to test and make sure that the output directed directly after being sensed from the camera is taken in properly and efficiently.
The robotic arm used in this module has been enabled by a single degree of freedom and also has pincers attached to the end by a gear system. This was made by using 3ds Max as the simulation software.…
flow of electron current in a conductor. All materials naturally contain some resistance to the flow of electron current. We have not found a way to make conductors that do not have some resistance.
If we use our water analogy to help picture resistance, think of a hose that is partially plugged with sand. The sand will slow the flow of water in the hose. We can say that the plugged hose has more resistance to water flow than does an unplugged hose. If we want to get more water out of the…
Fig. 3. Schematic Diagram of Power Line Guardians (“PLG”)
PLGs are also used to give the real-time data on the lines such as: line current, conductor temperature, frequency, sag -.
Fig. 4. The PLG communications system.
The diagram (Fig.4) shows the PLG communications system. PLGs (blue) control the power flows on the lines. Super PLGs (red) can control both the power flows and the PLGs. These Super PLGs are also used to communicate with Energy Management Systems (EMS) and allow…
SIMULATION RESULTS AND DISCUSSION
4.5.1 Compensation of Voltage Sags
All the proposed controllers performed to the IEEE standard. Table 4.5 shows voltage sag compensation of the proposed intelligent controllers. Compensated SS value shows the voltage sag compensation capability of the each proposed controller under different fault types and load conditions.
In case 1, performance of DVR with proposed fuzzy logic controller has the sag score 0.5056pu observed at sensitive load before…