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Author : Marcel Giguère
Publisher :
ISBN 13 :
Total Pages : 170 pages
Book Rating : 4.:/5 (113 download)
Download or read book Conception d'un moteur à aimants sans encoches à alimentation unipolaire written by Marcel Giguère and published by . This book was released on 1994 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Li Kong
Publisher :
ISBN 13 :
Total Pages : 213 pages
Book Rating : 4.:/5 (952 download)
Download or read book Contribution à la conception d'un moteur à aimants permanents du type jante et à 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
Author : Bertrand Nogarède
Publisher :
ISBN 13 :
Total Pages : 207 pages
Book Rating : 4.:/5 (489 download)
Download or read book Étude de moteurs sans encoches à aimants permanents de forte puissance à basse vitesse written by Bertrand Nogarède and published by . This book was released on 1990 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL EST RELATIF A L'ETUDE DE MOTEURS SYNCHRONES A AIMANTS DE FORTE PUISSANCE A BASSE VITESSE, COMPORTANT UN INDUIT SANS ENCOCHES, APTES A DELIVRER UN COUPLE ELEVE ET DONT LES ONDULATIONS SONT REDUITES. L'EXAMEN DE LA FAISABILITE D'UNE TELLE STRUCTURE MONTRE QUE LA SOLUTION SANS ENCOCHES N'EST VRAIMENT PRATICABLE QUE POUR UNE ALIMENTATION PAR DES COURANTS SINUSOIDAUX. DE PLUS, DANS CE CAS, IL APPARAIT QUE L'AUGMENTATION DU VOLUME D'AIMANT ET LES INCONVENIENTS QU'ENTRAINE CETTE SOLUTION, PAR RAPPORT A DES STRUCTURES PLUS CLASSIQUES, NE SONT PAS DEMESUREES SI L'ON CONSIDERE LES AVANTAGES POTENTIELS QU'ELLE PRESENTE. UNE METHODE DE MODELISATION, PARTICULIEREMENT BIEN ADAPTEE A L'ETUDE DES MACHINES A AIMANTS A INDUIT SANS ENCOCHES, EST ENSUITE PRESENTEE. CETTE METHODE EST BASEE SUR LA RESOLUTION ANALYTIQUE DES EQUATIONS DU CHAMP MAGNETIQUE. A L'AIDE DE CET OUTIL, LES CONFIGURATIONS OPTIMALES RELATIVES A LA DISPOSITION DES AIMANTS ET A LA STRUCTURE DU BOBINAGE SONT RECHERCHEES, EN VUE DE MINIMISER LES ONDULATIONS DU COUPLE ELECTROMAGNETIQUE. L'ENSEMBLE DE CES CONSIDERATIONS THEORIQUES EST ENSUITE VALIDE PAR UNE APPROCHE EXPERIMENTALE, DEVELOPPEE AUTOUR D'UN PROTOTYPE SANS ENCOCHES A AIMANTS. CES ESSAIS MONTRENT QU'IL EST PRATIQUEMENT POSSIBLE D'OBTENIR UNE ONDULATION DE COUPLE TRES REDUITE. LE DISPOSITIF D'ALIMENTATION ELECTRONIQUE PERMETTANT LE CONTROLE DE LA MACHINE EST ENFIN PRIS EN COMPTE. L'ANALYSE PROPOSEE PERMET DE CARACTERISER LE FONCTIONNEMENT SUR LE PLAN DU REGIME FONDAMENTAL ET DES HARMONIQUES INTRODUITES PAR L'ALIMENTATION ELECTRONIQUE
Author : Don Montague
Publisher : Taylor & Francis
ISBN 13 : 9780419199106
Total Pages : 472 pages
Book Rating : 4.1/5 (991 download)
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.
Author : Emma Carlson Berne
Publisher : Referencepoint Press
ISBN 13 : 9781601520197
Total Pages : 118 pages
Book Rating : 4.5/5 (21 download)
Download or read book Global Warming and Climate Change written by Emma Carlson Berne and published by Referencepoint Press. This book was released on 2008 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Throughout the world, the cause and impact of global warming and climate change is being passionately debated. While many claim that a climate crisis is imminent if greenhouse gases are not curbed, others argue that the effects have been overblown. Through objective overviews, primary sources, and full-color illustrations, this title will examine What Is Global Warming and Climate Change? What Are the Consequences of Global Warming? What Are the Controversies Surrounding Global Warming? What Are the Solutions for Global Warming?
Author : Nawic Education Foundation
Publisher :
ISBN 13 : 9781491730812
Total Pages : 0 pages
Book Rating : 4.7/5 (38 download)
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.
