fe研發(fā)培訓(xùn),設(shè)計(jì)培訓(xùn)(編輯修改稿)
2025-01-29 01:28 本頁面
【文章內(nèi)容簡介】 d, each button can be activated to plete the model. ? The buttons are Build Field Pole Build Air Gap Build Shaft Build Damper Bars Build Coil Rotor Model Phase Set Model Mesh Air Gap Mesh (Closeup) ? 2D FE models solve for field distribution over a machine crosssection by neglecting all fringing and end effects, called 3D effects.? Since 3D modeling requires considerable puter programming and CPU time, it is not yet practical to solve rotating machine transient problems in 3D.? To improve correlation with test results, it is essential to include the 3D effects. 3D Effects Modeling ? 3D effects include stacking of core laminations, ventilation air ducts fringing flux and pole and stator end leakage flux.? Some methods to include 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 leak
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