fe研發(fā)培訓(xùn),設(shè)計(jì)培訓(xùn)-全文預(yù)覽
【正文】 odeling ? The scaled permeability is used in the FE model by scaling the actual B(H) characteristic of the steel material in each region by the stacking factor Hmod = Hact, Bmod = Bact fstack? The field solutions obtained using this “equivalent” FE model are scaled back to the actual flux densities Bact = Bmod / fstack 3D Effects Modeling ? The duct fringing flux and end leakage flux effects can be modeled in a static model to obtain the leakage correction factors 3D Effects Modeling Field SolutionOC Solution at 120% Rated Voltage ? Engineering parameters of interest can be derived by postprocessing of the field solution.? The software postprocessing has many options to calculate the desired quantities.? The calculated quantities can be exported to excel spreadsheet for additional data analysis. Postprocessing Graphical PlottingOC Saturation ? In integral slot machines the geometry and the magic field distributions repeat every pole pitch, and it is, therefore, sufficient to perform the field analysis using just one pole pitch. ? In fractional slot machines the stator coils do not repeat every pole pitch, but only after multiple pole pitches depending on the coil pattern. Fractional Slot Machines ? In a winding characterized by A+B/C slots per pole per phase, the winding pattern and magic fields repeat only after C pole pitches.? Therefore, C pole pitches have to be modeled, which results in large FE models and long simulation times. Fractional Slot Machines ? The periodicity of the magic fields is utilized to reduce the FE model with periodic boundary conditions for the magic vector potential A. ? The vector potential of the nodes on the left radial boundary has the same magnitude as the potential of the corresponding nodes on the right boundary, and the sign depends on the number of poles in the FE model Np,mod.Aleft = (1)Np,mod Aright Fractional Slot Machines Solutio
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