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Novel Bearingless Segment Motor Design with Axial Magnetized Rotor Magnets
W. Gruber,J. Passenbrunner,G. Bramerdorfer,W. Amrhein 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Bearingless motors and active magnetic bearings work completely contact- and wearless. With these properties, hermetically sealed and lubricant free rotating systems for various applications can be designed. It is possible to stabilize three degrees of freedom by reluctance forces, when a permanent magnet excited rotor disc is used. This constructional design is called bearingless slice motor. The bearingless segment motor is a subtype of the slice motor, featuring a segmented stator composition. This paper comprises the design process of a novel bearingless segment motor with axial magnetized rotor magnets, five stator elements and concentrated windings. Finite-element-simulations are applied to maximize the bearing forces and the motor torque per ampere and minimize the reluctance forces. However, the mathematical model of the system is nonlinear, so an appropriate nonlinear control scheme has to be applied to put the system into operation. The introduction of a prototype together with measurements completes the paper.
Pellegrini, G.,Seol, Y.J.,Gruber, R.,Giannobile, W.V. SAGE Publications 2009 Journal of dental research Vol.88 No.12
<P>The development of new medical formulations (NMF) for reconstructive therapies has considerably improved the available treatment options for individuals requiring periodontal repair or oral implant rehabilitation. Progress in tissue engineering and regenerative medicine modalities strongly depends on validated pre-clinical research. Pre-clinical testing has contributed to the recent approval of NMF such as GEM 21 S<SUP>®</SUP> and INFUSE<SUP>®</SUP> bone grafts for periodontal and oral regenerative therapies. However, the selection of a suitable pre-clinical model for evaluation of the safety and efficacy of a NMF remains a challenge. This review is designed to serve as a primer to choose the appropriate pre-clinical models for the evaluation of NMF in situations requiring periodontal or oral reconstruction. Here, we summarize commonly used pre-clinical models and provide examples of screening and functional studies of NMF that can be translated into clinical use.</P>