The technically pure copper is being replaced by aluminium as conductive material in electrical transformers for power systems. This evolution brings new manufacturing challenges. One major difficulty is the limited weld ability and non-acceptable residual deformations of the aluminium, when welded by fusion arc welding processes. The Friction Stir Welding (FSW) was selected for evaluation cons...

a mathematical modelling for more-winding single-phase transformer is presented. the incidence matrix-which gives the informations about the connection of the ends of the windings between the nodes-is multiplied leftside and rightside with the inverse of the inductance matrix of the more winding transformer. the result is a matrix which gives the relationship between nodes potentials and nodes ...

With the advent of smaller, less expensive, and generally more effective computers, simulation models and simulation environments have become increasingly popular tools for solving engineering problems. This paper describes an effort to link a genetic algorithm with WITNESS, a modeling program developed by AT&T and Istel, in order to optimize a model of a manufacturing process called filament w...

The voltage control is performed by changing the turns ratio. This is done by provision of taps in the winding. The volts per turn available in large transformers is quite high and hence a change of even one turn on the LV side represents a large percentage change in the voltage. Also the LV currents are normally too large to take out the tapping from the windings. LV winding being the inner wi...

We study supermembranes in the light-cone gauge in eleven flat dimensions with compact directions. The membrane states are subject to only the central charges associated with closed two-branes, which, in this case, are generated by the winding itself. We present arguments why this winding leaves the mass spectrum continuous. The lower bound on the mass spectrum is set by the winding number and ...

To extract critical points from a (3D time-resolved) blood-flow velocity field, we employ a 3D winding number algorithm. Experiments are performed to asses the behavior of the winding number algorithm. First is experimented with artificial data sets, and the robustness of the winding number algorithm is tested, along with the indexation algorithm and the clustering algorithm. Subsequently, some...

We find the exact winding number distribution of Riemann-Liouville fractional Brownian motion for large times in two dimensions using the propagator of a free particle. The distribution is similar to the Brownian motion case and it is of Cauchy type. In addition we find the winding number distribution of fractal time process, i.e., time fractional Fokker-Planck equation, in the presence of fini...

leads and windings due t o eddy cu r ren t s induced in the conductors by t h e al ternat ing magnetic field. The leads and windings a r e connected in series, therefore, t he high-frequency resistance of t he transformer R t is An accurate, analyt ical method is proposed f o r calculating the lead and winding high-frequency resistance of complex transformer constructions. High-frequency resist...

A process model was developed for the fabrication of closed shape composite structures such as thick-wall cylinders, with the emphasis on fiber bundle deformation and its effect on the process physics. A continuum mechanics model for fiber bundle deformation in the composite manufacturing processes was proposed. Based on this model, the winding and consolidation processes for thick wall cylindr...

Hanne Jussila Concentrated Winding Multiphase Permanent Magnet Machine Design and Electromagnetic Properties – Case Axial Flux Machine Lappeenranta 2009 119 p. Acta Universitatis Lappeenrantaensis 374 Diss. Lappeenranta University of Technology ISBN 978-952-214-882-7, ISBN 978-952-214-883-4 (PDF), ISSN 1456-4491 Concentrated winding permanent magnet machines and their electromagnetic properties...