ac-dc電路轉(zhuǎn)換-資料下載頁
2025-09-25 16:54本頁面
【正文】 edelec reinvented them ? Structural FEA codes have been used for more than 40 years whereas 3D electromagic FEA codes date back at most to the 1980s Boundary Conditions Boundary Conditions in AC/DC Problems ? Electric boundary conditions – Surface charge – Inward current flow – Electric potential – Distributed impedance – Port – used for lumped parameter putations – Electric shielding – for thin, high conductivity sheets – Floating potential dVVjVVJr efrns/))(( 00????????????????JnJnDnBoundary Conditions in AC/DC Problems ? Magic boundary conditions – Surface current – Magic field – Electric insulation – Magic potential – Magic insulation – Impedance boundary condition – Thin air gap in magic circuit – Magic shielding – for thin, high permability sheets 0000?????????????AnAnAnHnHnHnJHn sImpedance Boundary Condition ? An absorbing boundary condition with losses ? Converts objects with a small skindepth to a boundary condition ? Impedance condition OK to use if: S k i nO b j e c tt ??? Example: Generator Generator model with true motion ? A generator model with rigid body motion (rotation). ? Different dependent variables are coupled at a sliding interface (boundary). ? Making use of extrusion coupling variables with a time dependent rotational transformation. ? Magic saturation effects are included by interpolating empirical data. A model with true motion rotor with mags stator windings sliding mesh interface in air gap Rotational coordinate transform at sliding mesh interface ??????????)c o s ()s i n ()s i n ()c o s (tttt????RxRx39。Nonlinear magic material with saturation from lookup table |B| ?r = |B|/|H| 1 1200 820 560 420 290 220 160 110 70 47 26 15 10 7 6 A model with true motion
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