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【正文】 3D effects in FE models have been developed. 3D Effects Modeling 3D Effects ModelingLdwFEsolutionregionF ? Figure shows a magic circuit in which flux F, width w and depth d are in the plane of the FE solution region, and the axial length L is perpendicular to the plane of the FE solution domain.? The permeance P of this magic circuitP = m w L / d 3D Effects Modeling ? The permeance Pmod of a circuit ponent in the FE model has to be identical with the actual permeance Pact of this ponentPact = mact wact Lact / dact Pmod = mmod wmod Lmod / dmod? Width and depth of the FE model agree with the actual dimensions, which gives the scaling equation for the permeability mmod mmod = mact Lact / Lmod= mact fstack 3D Effects Modeling ? 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 depe
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