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Influence of High Performance Voltage Converters Supply Upon the Induction Motors Behaviour
("Dunarea de Jos" University of Galati, 2002)
The induction motors supply by converters leads to a distorted regime
accompanied by some parasite torques and some supplementary losses. These aspects
are emphasized further on because their quantitative determinations ...
Energetic Optimal Control of Adjustable Drive Systems
("Dunareade Jos" University of Galati, 2002)
In the paper is developed a new control strategy for the adjustable speed
drives. The strategy consists in the energetic optimal control of the dynamic regimes as
starting, stopping and reversing. The main developed ...
On the Snubber Influence to the Switching and Conduction Losses in a Converter Using Switched Capacitor
("Dunarea de Jos" University of Galati, 2002)
The paper deals to design and to compute the snubber parameters influence on
the switching and conduction losses of the transistors (IGBT) used as bidirectional
switches in a converter with switched capacitor. The converter ...
Speed and Rotor Flux Estimation in Speed Sensorless Control of Induction Motor
("Dunarea de Jos" University of Galati, 2002)
The paper compares the performances of several adaptive rotor flux and speed
estimation methods used in speed sensorless vector control of induction motor. First, a
short review of Luenberger, Gopinath, MRAS, Torque Error ...
New Power Optimization Posssibilities
("Dunarea de Jos" University of Galati, 2002)
In this paper there are given a few mathematical relations for the power
analysis in un-sinusoidal regime. If the voltage is sinusoidal and the current is unsinusoidal,
the apparent power will be ascertained by the active ...
Energetic Macroscopic Representation Applied to an Electrical Urban Transport System
("Dunarea de Jos" University of Galati, 2002)
An energetic description of the electric transport urban system ASTRAIK
415T is proposed according to a specific formalism. This is used to simulate the
trolleybus system, equipped with a chopper and a direct current ...
Some Considerations Regarding the Efficiency of the Electromechanical Motion
("Dunarea de Jos" University of Galati, 2002)
Control techniques for servo drive which run at variable speed for prolonged
time is developed on the base of minimum energy dissipation in a feed-forward
structure. The optimal control laws are determinate using the ...
Comparison on Sensorless Control of Synchronous Motors
(Dunareade Jos University of Galati, 2002)
The paper compares two different methods for speed and position estimation
in AC permanent magnet synchronous motors vector control applications. The first
method implies two observer blocks — one for the speed, and the ...
Gis Components: an Overview of the Software Format Approaches
("Dunarea de Jos" University of Galati, 2000)
The paper proposes a softwarel multimedia point of view of the resources and
fi1e formats used in GIS applications. An overview of the most known software
approaches for GIS data management and components is proposed in ...
Finding Exception for Association Rules Via SQL Queries
("Dunarea de Jos" University Galati, 2000)
Finding association rules is mainly based on generating larger and larger
frequent set candidates, starting from frequent attributes in the database. The frequent
sets can be organised as a part of a lattice of concepts ...