SM_STA_004

Objective

Validation objective
TopologySCIM
Model Types Structural Mechanics model SM1
FEA calculation of natural frequencies under GetDp SM2
Analytical natural frequencies SM1
Quantities Natural frequencies
Geometry Internal rotor
Opened rectangular slot
Winding Without winding

The FEA model under GetDP includes transverse isotropic properties of the stator lamination. The applied boundary conditions are free/free but some other conditions can be applied (e.g. free/campled, or campled/campled). The winding is here modelled as an additional mass in the slots.

Machine

This validation simulates the MANATEE default induction machine.

Manatee model for default machine SCIM_008
Manatee model for default machine SCIM_008
GetDP/Gmsh meshing for default machine SCIM_008
GetDP/Gmsh meshing for default machine SCIM_008

Results

Modes visualisation under Manatee
Modes visualisation under Manatee
Analytical and FEA comparison of natural frequencies
Analytical and FEA comparison of natural frequencies

Remarks and interpretation

The first order elements used in FEA for a fast calculation are stiffer than the second order ones, which explains larger natural frequencies compared to the analytical model. As the lamination is generally stiffened by weldings, bars, or ribs along the circumference, the FEA modal analysis give closer results to experiments.

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