Adrian GRAUR   - Dean of the Faculty of Electrical Engineering
 

ASSOCIATE  EDITORS

  Ştefan Gh. PENTIUC  - Scientific secretary of the Faculty of Electrical Engineering
  Dorel CERNOMAZU  - Head of the Electrotechnique Dept.,Faculty of Electrical Engineering
  Leon MANDICI   - Faculty of Electrical Engineering
 

EDITORIAL  BOARD

International
 Tudor AMBROS   - Chişinău Polytechnical Institute - MOLDAVIA
 Jao Paulo BAPTISTA  - Instituto Politecnico do Porto - PORTUGAL
 Oleg BREKHOV  - Moscow Aviation Institute - RUSSIA
 Luc DE BACKER  - Katholieke Hogeschool Sint-Lieven Gent - BELGIUM
 Liévin DEVOS     - Ecole Universitaire d'Ingénieurs de Lille - FRANCE
 H. EHRLICH                - Technical University Leipzig - GERMANY
 Eleftherios A. KAYAFAS - National Technical University of Athens - GREECE
 V. KRAPIVIN         - Moscow Institute of Radioengineering and Electronics - RUSSIA
 Vladimir MESYURA  - The State Technical University of Vinnitsa - UKRAINE
 Jean MIGNOT   - Université Franche - Comté, Besançon - FRANCE
 John MILNER         - City University London - GREAT BRITAIN
 Jose OLIVEIRA e SA  - Instituto Politecnico do Porto - PORTUGAL
 Carine NAESSENS  - Katholieke Hogeschool Sint-Lieven Gent - BELGIUM
 Yves PERRIARD   - Swiss Federal Institute of Technology - Lausanne - SWITZERLAND
 Nicola PITRONE  - Universita degli Studi Catania - ITALIA
 Jean Paul SIX       - Université des Sciences et Technologies de Lille - FRANCE
 F. SOPRONIUC          - University of Cernăuţi - UKRAINE
 Bernard TOURSEL   - Université des Sciences et Technologies de Lille - FRANCE
 Rodger ZIEMER  - Colorado Spring University - USA

National
 Lorin CANTEMIR  - Technical University Iaşi
 Mihai CRETU   - Technical University Iaşi
 Ionel HAIDUC   - Technical University Cluj-Napoca
 Ioan JURCA   - University Tehnica Timişoara
 Petru LEONTE   - Technical University Iaşi
 Ioan LETIA   - Technical University Cluj-Napoca
 Radu MUNTEANU  - Technical University Cluj-Napoca
 Costică NITU      - University Politehnica Bucureşti
 Adrian PETRESCU - University Politehnica Bucureşti
 Mircea PETRESCU  - University Politehnica Bucureşti
 Alexandru VALACHI  - Technical University Iaşi
 

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Constantin FILOTE

tel:(40) 30.214167/181, fax: (40) 30.520277; E-mail: filote@eed.usv.ro

Adrian GRAUR,

tel:(40) 30.216297, fax: (40) 30.520277; E-mail: adriang@eed.usv.ro

"Stefan cel Mare" University of Suceava, 1 University Street, Romania
 
 

Abstract: The paper proposes a simulation package for dynamic analyses of vectorial controlled induction motor. It is built under MATLAB with SIMULINK program environment and it consists of state transformation (a, b, c-a, b), system transformation (a, b, c-d, q), induction motor models, mechanical load, robust-adaptive flux observer, rotor speed estimator (MRAS), rotor resistance identification, controller. Each element of the whole system is represented as a separate Simulink block and it can be independently simulated or connected to the others in order to analyze their interaction. A diskette with the most simple version (school-version) of VCIM library is available and can be found at the authors.
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Part I: SOME SIMPLE CASES

Vlad CEHAN

Bd. Copou 11, Iasi, Romania; E-mail: vlcehan@tuiasi.ro

Nicolae D. ALEXANDRU

Bd. Copou 11, Iasi, Romania; E-mail: nalex@tuiasi.ro

Technical University "Gh. Asachi" Iasi
 
 

Abstract. The paper evaluates and discusses envelope distortions arising when a PSK - modulated signal passes through some simple selective circuits found in AM receivers.
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Part II: A REAL CASE

Vlad CEHAN, Bd. Copou 11, Iasi, Romania; E-mail: vlcehan@tuiasi.ro

Nicolae D. ALEXANDRU, Bd. Copou 11, Iasi, Romania; E-mail: nalex@tuiasi.ro

Technical University "Gh. Asachi" Iasi

Abstract. The paper discusses envelope distortions arising when a PSK - modulated signal passes through mistunned selective circuits found in AM receivers. The influence of the transient distortions of the envelope on the AM reception are evaluated.
 
 

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Mihaela Doina ZAMFIR

Cristea PAL

Gheorghe LIVINT

"Gh. Asachi" Technical University Iasi
 
 

Résumé: Dans ce travail on veut réaliser le découplage entrées/sorties et la commande optimale des robots industriels. On suposse que l'état este inaccessible et il faut le reconstruire a l'aide d'un observateur. Pour concevoir un retour d'état, donc finalement pour réaliser une combination linéaire des états, on montre qu'il n'est pas necessaire de reconstruire chaque variable d'état explicitement et qu'on peut encore réduire les dimensions d'observateur.
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Mihaela Doina ZAMFIR

Cristea PAL

Iulian GRAUR

"Gh. Asachi" Technical University Iasi
(for paper request mail to: adriang@eed.usv.ro )

Résumé. Ce travail traite une nouvelle structure de pilot automatique équipée d'un moteur série du courant continu dont l'originalité principale consiste a exploiter au maximum la connaissance a priori contenu dans le modele mathématique qui représente le systeme a piloter.
Cette connaissance a priori, judicieusement exploitée, permet de garantir un fonctionnement optimal. Le model permet principalment de prédire a tout instant quel va etre le comportament du robot dans un futur plus ou moins éloigné et de calculer les commandes instantanées admissibles qui permettent de contrôler cette évolution.

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Stefan-Gheorghe PENTIUC

"Stefan cel Mare" University of Suceava
str.Universitatii nr.1, RO-5800 Suceava, E-mail: pentiuc@eed.usv.ro

Daniel BLUMENFELD
Central Research Institute for Informatics, Suceava Branch
 
 

 Abstract. The paper presents the results of a first step to an automatic reading of the indications of the measurement devices placed on an automatization panel supervised by a TV camera linked to a computer. The objective of the stage was to interpret the indications of a single device, its image being well centered in the analyzed frame. The monochrome scanned image is digital processed. The image is binarized, the objects are isolated, the indicator and the minimum value mark are identified on the image. The analog indicated value is computed based on the angle done by the device indicator in the image and supplementary information stored about the measure device.
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Constantin FILOTE

"Stefan cel Mare" University of Suceava, 1 University Street, Romania

tel:(40) 30.214167/181, fax: (40) 30.520277, E-mail: filote@eed.usv.ro
 
 

Abstract: If the rotor flux is applied as criterion in the vectorial command of induction machines, the value and direction of the flux need to be know. Starting from two mathematical models for induction motor, this paper analyses at theoretical view point and through simulation the performances of a conventional simulator for rotor flux concerning to influence with temperature of the rotor resistance. Since, all this classic methods do not seem to provide acceptable performances, flux observers were used to measure the flux.

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Valentin POPA

"Stefan cel Mare" University of Suceava

str. Universitatii nr.1, RO-5800- Suceava, E-mail: valentin@eed.usv.ro
 
 

Abstract. This paper proposes a system for printer sharing between 2 to 4 computers. This system doesn't need an extra power supply and the performances are mainly the performances of the Microchip's PIC 16C84 microcontroller which provides the best price/performance rate.

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Ion TOMA

" Stefan cel Mare " University of Suceava, 1 University Street, Romania

tel: +40-30-214167/178, fax: +40-30-520277, E-mail: toma@eed.usv.ro

Adrian GRAUR

" Stefan cel Mare " University of Suceava, 1 University Street, Romania

tel: +40-30-216297, fax: +40-30-520277, E-mail: adriang@eed.usv.ro
 

Abstract.This paper presents the use of an Intel N80C196KC microcontroller to control the speed of a DC Escap micromotor. The approach emphasises the application of the microcontroller as a flexible data acquisition and control device. DC motor under microcontroller systems control is an important component in industrial process control applications. Presented below is a control scheme and assembly routines to regulate the motor speed under conditions of varying load by software feedback control.
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Valentin POPA

Ioan MACINCA

"Stefan cel Mare" University of Suceava

str. Universitatii nr.1, RO-5800- Suceava, E-mail: valentin@eed.usv.ro
 
 

Abstract: This paper will search the best TCM scheme for a codec with two states and a bit rate R_b=4 bits/symbol. Three expanded constellations will be analysed:16-QAM, 32-QAM (CCITT) and 18-AMPM with partially overlapped signals. All these schemes will be compared using AWGN channels for a P_b=10^-5 bit error probability.     Back to top

Radu PENTIUC

Université "Ştefan cel Mare" Suceava

tel: +40-30-214167/178, fax: +40-30-520277,
str. Universităţii nr.1. RO-5800 Suceava, E-mail: radup@eed.usv.ro
 
 

Résumé. Dans l'étude l'auteur, en ayant pour le support les schémas électriques équivalents du moteur hybride, propose des relations de calcul pour les réactances des enroulements dans l'anneau des inducteurs linéaires. On détermine les réactances de magnétisation.

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Cezar POPA

"Stefan cel Mare" University of Suceava

str.Universitatii nr.1 , RO-5800 Suceava
 
 

 Abstract Magnetic field modelling for electro - thermal energy converter is essential in calculation of total losses and to estimate warm developed in massif ferromagnetic windings. Knowlegement of local magnetic field intensity give the possibility to evaluate local current density , volume distribution of electrical power in material.
 

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Ioan COJOCARIU

"Stefan cel Mare" University of Suceava

str. Universitatii nr.1, RO-5800 Suceava, E-mail: cojocaru@eed.usv.ro
 
 

Abstract. The paper presents a DC Electrical Drive controlled using Philips 80C552 microcontroller. The power converter is a full bridge converter achieved with bipolar power transistors. To obtain a variable bipolar voltage at the DC motor input the bipolar Pulse Width Modulation (PWM) technique is applied. The microcontroller give the digital control signal to the power converter and read the information from the digital transducer. Also the microcontroller periodically read the local keyboard and write to the local display. The interface circuits were developed using the simulation package MicroSim PSPICE.
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Radu PENTIUC

The University " ŞTEFAN cel MARE " of Suceava

tel: +40-30-214167/178, fax: +40-30-520277,

str. Universităţii nr.1, RO-5800, E-mail: radup@eed.usv.ro
 
 

Abstract. In the present work the author offer some constructive solutions of the hybrid motors resulted from the successive transformations of the rotating induction motors. The board effect, caused by the finite dimensions armatures and also by the longer air gap, is known and estimated using mathematical relations applied to the linear motors. It has been tested the expression of the secondary plate resistance, for the hybrid construction, with a bilateral toroidal inductor, when the end effect is not neglected.
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Pavel ATANASOAE
 
 
 
 
 

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Subscription and Paper Submission

Mail
prof. Adrian GRAUR
Faculty of Electrical Engineering
The "Stefan cel Mare" University of Suceava,
str.Universitatii nr.1
RO-5800 SUCEAVA
Romania

e-mail:  adriang@eed.usv.ro

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