Electric motor noise and vibration can be calculated inside Manatee software based an existing 3D FEA mechanical model. Contrary to analytic NVH models, a 3D FEA mechanical model allows to accurately model the effect of rotor structure electromagnetic excitation (e.g. rotor housing coupling mode, rotor bending modes), as well as stator boundary conditions. It is especially useful when introducing tolerances and faults in e-NVH calculations.
In detailed design phase, the structural environment of the electrical machine is knowed through a detailed CAD model. A 3D FEA mechanical model is then built by a mechanical engineer based on his experience of electric motor mechanical properties, or by fitting the model properties with an Experimental Modal Analysis. The accurate modeling of the complex mechanical structure depends on the electrical machine topology and manufacturing process.
Once the 3D FEA mechanical model is built, it can be represented by its modal basis. Modal basis format may depend on the third party mechanical software that is used.
For more information on how to setup the modal analysis in Optistruct/Hypermesh, or Ansys Workbench, you can have a look at these guidelines.