Based on the FEM analysis it could be seen that the main modes are bending modes and the first torque mode is located for the frequency of 63 Hz.
There were found differences between the modes of the frame and of the stator. Some of the modal shapes were found, as the same for the separate parts and for the assembly but the most majority are different as a result of the boundary conditions.
The analyse of each part considering similar boundary condition as in case of assembly can offer a general image of the dynamic behaviour of the whole but not quite the same as the total assembly.
In the case of the stator there were found in any analysis (as single part or as component in the assembly) high levels of natural frequencies tied with the bars for coils. In reality this aspect is not found because of the wires.