Download or read book Contribution la conception d un moteur aimants permanents du type jante et son alimentation written by Li Kong and published by . This book was released on 1994 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subject of this dissertation is the study of a pennanent magnet brushless motor and its feed.ing inverter in the application of an electric vehicle. The different systems of electric vehicles are reviewed in the first chapter. The solution retained is an in-wheel brushless motor with pennanent magnet NdFeB. The points focused in designing a brushless motor concem the minimisation of the harmonics and the temperature influences on the magnetic characteristics of the magnet NdFeB and, therefore, on the motor. In chapter 2, the magnets are divided in some blocks and are shifted up each other along the motor axis. Based on the static torque curve, the real dimensions of the magnets and the slots and the saturation effect have been taken into account in our study. In regular shifting, the best total shifting angle does not correspond to a tooth step. The irregular shifting is approved particularly efficient even in the case of3 magnet blocks. In the third chapter, the entire B(H) curves of NdFeB is described, for all temperatures, by means of the double variables Chebychev polynomial series. These expressions are integrated in the package Flux-Expert for determining the magnetic field of the machine (in 2D) by finite elements method. This motor is especially sensible to the temperature and the armature reaction does not change greatly the working point of magnet. The two stages DC AC-AC supply inverter allows to have a soft switching in the drive system and, therefore, a limited electromagnetic pollution in the vehicle. The behaviour of this inverter is simulated, in chapter 5, by means of a program adapted from the software A TOSEC. The simulation results show that themodulation frequency for the first stage of the inverter should be in the order of 20kHz for a good current regulation. The simulation is valid for a lspeed up to 75% of its maximum under the rated eurrent and the current control remains efficient when the current is shifted from the electromagnetic force by an angle and even with the presence of toothharmonies

Download or read book Contribution la conception et l tude d un moteur sans balais et sans capteur de position written by Ali Taibi and published by . This book was released on 1992 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE PREMIER CHAPITRE EST CONSACRE A LA COMPARAISON DE QUELQUES STRUCTURES DE MOTEURS SYNCHRONES AUTOPILOTES AVEC L'ETUDE DES HARMONIQUES DE COUPLE POUR UNE ALIMENTATION EN COURANT ET UNE OPTIMISATION DE L'OUVERTURE DES AIMANTS PERMANENTS. CE TYPE DE MOTEUR EST MIS EN EQUATION EN INTRODUISANT DES ENROULEMENTS FICTIFS SUPPLEMENTAIRES. PAR UTILISATION DE DEUX TRANSFORMATIONS DE COORDONNEES, ON SE RAMENE A DEUX AXES EN QUADRATURE. LA COMPARAISON DES COMPORTEMENTS DU MOTEUR POUR DEUX COUPLAGES ZIG-ZAG ET ETOILE SERIE PERMET D'EVALUER LES PERFORMANCES POUR UNE ALIMENTATION EN TENSION. LE TRANSFERT D'ENERGIE LORS DE LA COMMUTATION DES PHASES, DANS LE CAS DU MONTAGE ZIG-ZAG, ET L'INFLUENCE DU TEMPS DE COMMUTATION ET DE LA POSITION DU ROTOR SUR L'EVOLUTION DES DIFFERENTS COURANTS DE PHASE SONT ETUDIES DANS LE TROISIEME CHAPITRE. DANS LE QUATRIEME CHAPITRE UNE TECHNIQUE DE PILOTAGE DU MOTEUR SANS CAPTEUR DE POSITION EXTERNE EST PROPOSEE, ELLE EST BASEE SUR LES SIGNAUX INTERNES DU MOTEUR. LA DETECTION DE LA POSITION DU ROTOR A L'ARRET EST MISE EN UVRE A PARTIR DES RESULTATS DU CHAPITRE TROIS. LE DERNIER CHAPITRE EST RELATIF AU COMPORTEMENT TRANSITOIRE DU MOTEUR LORS D'UNE VARIATION DU COUPLE OU DE LA TENSION D'ALIMENTATION. UNE COMPARAISON SUR LE PLAN DYNAMIQUE DES DEUX TYPES DE MOTEUR AVEC ET SANS CAPTEUR DE POSITION EXTERNE PERMET DE DEFINIR UN REGLAGE OPTIMAL

Download or read book Contribution la d finition de moteurs aimants permanents pour un v hicule lectrique hybride routier written by Carole Henaux and published by . This book was released on 1996 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL CONCERNE LA DEFINITION D'UNE CHAINE DE PROPULSION A AIMANTS PERMANENTS POUR UN VEHICULE ELECTRIQUE ROUTIER A TURBINE, DE TYPE HYBRIDE SERIE. LE CAHIER DES CHARGES COMPORTE DE NOMBREUSES MISSIONS DE CIRCULATION ET SON ANALYSE MET EN EVIDENCE LA DIFFICULTE A DEFINIR UN REGIME NOMINAL. L'ETUDE A CONSISTE A DEVELOPPER ET EXPLOITER UN OUTIL INFORMATIQUE D'AIDE A LA CONCEPTION DE CETTE CHAINE DE TRACTION SUIVANT UNE METHODOLOGIE QUI COMPORTE LA DEFINITION DES GRANDEURS DIMENSIONNANTES DE L'ACTIONNEUR, SON DIMENSIONNEMENT ET SA CARACTERISATION, ET L'EXPERIMENTATION SIMULEE DE SON COMPORTEMENT ELECTRIQUE ET THERMIQUE EN FONCTIONNEMENT. UN TRAITEMENT SPECIFIQUE DE L'ENSEMBLE DES MISSIONS DU VEHICULE PERMET TOUT D'ABORD DE DEFINIR LES GRANDEURS DIMENSIONNANTES. PUIS LE DIMENSIONNEMENT DE DIFFERENTES STRUCTURES DE MACHINE A AIMANTS PERMANENTS EST EFFECTUE PAR UN PREMIER MODULE BASE SUR DES MODELES ANALYTIQUES. LA STRUCTURE AINSI DIMENSIONNEE EST CARACTERISEE SUR LE PLAN ELECTROMAGNETIQUE AU MOYEN D'UN DEUXIEME MODULE, BASE SUR LE CALCUL DU CHAMP PAR ELEMENTS FINIS, CHAINE AU PREMIER PAR LE BIAIS D'UNE BIBLIOTHEQUE DE STRUCTURES GENERIQUES DE MACHINES A AIMANTS PERMANENTS. IL INCLUT UN MODULE AUXILLIAIRE DE VARIATION PARAMETRIQUE BASE SUR LA METHODE DES PLANS D'EXPERIENCE QUI PERMET D'ELABORER UN MODELE POLYNOMINAL DANS LE DOMAINE DE VARIATION. UN TROISIEME MODULE REALISE LA SIMULATION DU COMPORTEMENT ELECTRIQUE DE L'ACTIONNEUR SUR L'ENSEMBLE DES MISSIONS DE CIRCULATION AVEC UNE STRATEGIE DE COMMANDE A COUPLE MAXIMAL COMPLETEE PAR UNE STRATEGIE DE DEMAGNETISATION POUR ATTEINDRE LA ZONE DES HAUTES VITESSES. ENFIN UN QUATRIEME MODULE SIMULE LE COMPORTEMENT THERMIQUE DES MOTEURS AU COURS DES FONCTIONNEMENTS. CELUI-CI REPOSE SUR DEUX MODELES THERMIQUES GENERIQUES SPECIALEMENT DEVELOPPES ET VALIDES EXPERIMENTALEMENT PAR LA METHODE DES PLANS D'EXPERIENCE, SUR DES MOTEURS REPRESENTATIFS DES STRUCTURES CONSIDEREES, A ROTOR INTERIEUR OU EXTERIEUR. L'EXPLOITATION DE CET OUTIL D'AIDE A LA CONCEPTION PERMET FINALEMENT DE DEGAGER DES CONCLUSIONS SUR LES CONFIGURATIONS DE CHAINES DE TRACTION LES PLUS FAVORABLES EN TERMES DE NOMBRE DE MOTEURS, RAPPORT DE REDUCTION, BOITE DE VITESSES, SUR LES STRUCTURES DE MACHINES LES MIEUX ADAPTEES PARMI CELLES CONSIDEREES, ET SUR LES PROPRIETES ET CRITERES DE DIMENSIONNEMENT A PRIVILEGIER DANS CETTE APPLICATION

Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.

Download or read book Dictionary of the French and English Languages written by Gabriel Surenne and published by . This book was released on 1856 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Historical Dictionary of Iran written by John Henry Lorentz and published by Historical Dictionaries of Asia, Oceania, and the Middle East. This book was released on 2007 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an overview of specific events, movements, people, political and social groups, places, trends, and chronology. Allows for considerable exploration of a number of historical and contemporary topics and issues. The modern period, defined as 1800-present, is covered extensively.

Download or read book Philostratus written by Philostratus (the Athenian) and published by . This book was released on 1912 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analecta Or Materials For a History of Remarkable Providences Mostly Relating to Scotch Ministers and Christians written by Robert Wodrow and published by BoD – Books on Demand. This book was released on 2024-05-25 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reprint of the original, first published in 1842.

Download or read book Historical Dictionary of Pakistan written by Shahid Javed Burki and published by . This book was released on 1999 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pakistan is unlike most other countries in the emerging world. It is one of the two nations – the other being the state of Israel – founded on the basis of religion. Although it was created to provide a homeland for the Muslim community of British India, in its original form it was able to accommodate only about half of the people of Islamic faith who lived in the subcontinent. Pakistan’s birth in 1947 resulted in one of the largest movements of people in human history when some 14 million people left their homes, with 8 million Muslims leaving India for what is now Pakistan and 6 million Hindus and Sikhs moving in the opposite direction. This was the first large-scale incidence of ethnic cleansing the world was to witness. --

Download or read book Construction Dictionary written by Nawic Education Foundation and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An extensive listing of the terms and phrases used in construction. Included are many that are encountered daily on the jobsite or in the construction office.