fe研發(fā)培訓(xùn),設(shè)計培訓(xùn)-wenkub
2023-01-30 01:28:10 本頁面
【正文】 s called finite elements. Preprocessing? Consider onedimensional bar element. ? The value of a function over the element i is defined Preprocessing ? Similarly, for element j Preprocessing ?The most mon twodimensional element is a triangle. Preprocessing Preprocessing? The governing equation for 2D magic field problem can be derived from Maxwell’s equations by defining a potential function A. ?A residual is defined for an approximate solution. Preprocessing? Minimizing the weighted residual with respect to each nodal potential, we obtain ? Substituting from above, we obtain. Preprocessing? Using Green’s identity, we obtain. ?Substituting, we obtain the following equations. Preprocessing? In the processing step, we solve the system of equations derived in the preprocessing step. Processing? The coefficient matrix for the system of equations is sparse and is usually symmetrical along the diagonal.? For nonlinear magic field problems, the entries in the coefficient matrix are functions of permeability.? An iterative method, such as, NewtonRaphson is used for solution of the nonlinear system of equations. Processing? The principle of the NewtonRaphson method is to iteratively reduce this residual until it is sufficiently small (ideally zero). Processing? The mercial software packages MagNet by Infolytica of Canada and MagSoft by Cedret of France are used by RD for electromagic FEA.? A parametric modeling technique has been recently developed to automatically model synchronous machines by using MagNet.? An example of the application for 4 poles 8500 HP motor 2511DA is used for illustration. Software ? There are four modules for creation of a FE model parametrically. Stator (model stator core, air ) Rotor (model rotor pole, spider and field coil) Model (create model including all ponents) Phase SET (create stator winding connection) Parametric Modeling ? The stat
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