Power supplies for high-power piezoelectric multi-mass ultrasonic motor [Elektronische Ressource] / von Rongyuan Li

FAKULTÄT FÜR ELEKTROTECHNIK, INFORMATIK UND MATHEMATIK Power Supplies for High-Power Piezoelectric Multi-Mass Ultrasonic Motor Zur Erlangung des akademischen Grades DOKTORINGENIEUR (Dr.-Ing.) der Fakultät für Elektrotechnik, Informatik und Mathematik der Universität Paderborn genehmigte Dissertation von M.Sc. Rongyuan Li Guizhou, China Referent: Prof. Dr.-Ing. Joachim Böcker Korreferent: Prof. Dr.-Ing. Andreas Steimel Tag der mündlichen Prüfung: 29.01.2010 Paderborn, den 05.07.2010 Diss. EIM-E/263 DeclarationI confirm that the work submitted in this dissertation is the result of my owninvestigation and all the sources I have used or quoted have been acknowledgedby means of complete references.Paderborn, Sep.21.2009Rongyuan Lito my loving parents, wife and son.AcknowledgmentsThe work submitted in this dissertation has been carried out during my researchas scientific co-worker at University of Paderborn, department of Power Electron-ics and Electric Drives (LEA), Germany.IwouldliketoexpressmysincerelyhighappreciationtomyadvisorProf. Dr.-Ing.Joachim Böcker for his strict confidence, availability and full support throughoutthe whole period of my doctoral research. Dr. Böcker’s extensive vision andcreative thinking have been the source of my inspiration for the Ph.D work.I sincerely thank Dr.-Ing. Norbert Fröhleke, he gives me guidance, encourage-ment and support during all the time.