is there a way to calculate self and mutual inductances and flux-linkages in a 3-phase PMSM machines using elmers transient 2D electromagnetic solver? In my previous post I was able, with the help of the forum, to calculate induced voltage using circuits modul (see: Induced voltage in PMSM without Paraview). This raised again some interest in elmer.
According to Ansys help the calculation of inductances in Maxwell is based on the "Frozen Permeability" method. Hear the detailed description from Ansys help:
Would something like this be possible to implement in elmerFEM? I would really like continue using elmer for some calculations. As far as know this should be possible in FEMM.Inductance Computation for 2D and 3D Transient Solutions
Because both 2D and 3D transient solutions are nonlinear, for inductance computation, Maxwell provides two options: apparent inductance and incremental inductance. After the FEA normal solution is completed at each time step, the permeability associated with apparent inductance, or the differential permeability associated with incremental inductance, of each element, is frozen – which is equivalent to freezing the coefficient matrix (the left side of the equation to be solved). In order to obtain winding self-inductance and mutual inductance, the solver sets an excitation current of 1A in the first winding, while setting all other winding currents to zero (permanent magnet effects are excluded). This excitation assignment corresponds to one source vector on the right-hand side of the equation to be solved. As a result, the calculated flux linkage provides the self-inductance for the first winding with 1A excitation current, and the calculated flux linkages represent mutual inductance for all other windings with zero current. Next, the solver excites the second winding with a current of 1A, while setting all other winding currents to zero (permanent magnet effects are excluded). This excitation assignment corresponds to another source vector on the right-hand side of the equation to be solved. The solver continues this process until all windings have been assigned 1A current in turn.
Regards,
Mladen