the purpose of this study is to investigate the effect of strategic leadership on performance in technology-driven enterprises listed in tehran stock exchange. the research used a mixed methodology for attaining this goal. in the first step, delphi method was used for identification the dimensions and factors of strategic leadership (qualitative). in the next step, the survey method was used fo...

Due to the fringing effect, the magnetic flux in the air gap of electrical machines is reduced. This leads to the larger effective air gap length. For this reason, in the design stage of the electrical machines, a larger magnetic flux must be chosen. On the other hand, magnetic loading must be taken smaller than the value corresponding to the real air gap length. Currently, Carter coefficient i...

the paper presents the optimization results for several electrical machines dedicated for powered electric wheel-chairs. The optimization, using the Hook-Jeeves algorithm, was employed based on a design approach which takes into consideration the road conditions. Also, through numerical simulations (based on finite element method), the analytical approach was validated. The optimization approac...

This paper introduces the new FundemantalWave library which is included in the Modelica Standard Library 3.2. The presented Modelica package provides models and components of rotating electrical three phase machines. The presented electrical machine models are fully compatible with the original Machines library of the electrical domain but rely on the concept of the magnetic potential and magne...

OF DOCTORAL DISSERTATION AALTO UNIVERSITY SCHOOL OF SCIENCE AND TECHNOLOGY P.O. BOX 11000, FI-00076 AALTO http://www.aalto.fi Author Zlatko Kolondzovski Name of the dissertation Thermal and mechanical analyses of high-speed permanent-magnet electrical machines Manuscript submitted 19.11.2009 Manuscript revised 11.02.2010 Date of the defence 06.08.2010 Monograph Article dissertation (summary + o...

The simulation of electric rotating machines is both computationally expensive and memory intensive. To overcome these costs, model order reduction techniques can be applied. The focus of this contribution is especially on machines that contain non-symmetric components. These are usually introduced during the mass production process and are modeled by small perturbations in the geometry (e.g., ...