Learning Forum

[Hamid R]

Hello everyone,

I have coupled an electric motor from Ansys Maxwell to Ansys Mechanical in Workbench. I have conducted modal and harmonic response analyses. My goal is to calculate the displacement of the motor versus frequency due to the electromagnetic force that causes motor vibration. However, my results seem to be incorrect because the maximum displacement response is only 6nm, which is significantly smaller than expected. How can I precisely calculate the displacement of the motor due to vibration?

[Ashish Khemka]

Hi Hamid,

Please check if the forces imported are as expected. If performing MSUP Harmonic analysis then please check if sufficient numbers of modes are extracted.

 

Regards,

Ashish Khemka

[Hamid R]

Hello Ashish,

Thank you for your reply. In ANSYS Maxwell, I have drawn 36 arcs for the 36 stator slot teeth in the middle of the airgap and enabled the harmonic force calculation, as well as configured the DesignXplorer setup. In the modal analysis section, I imported a 3D model of the stator core with a frame that includes bolts and designated the bolt faces as fixed support. Then, I set up the modal analysis to search for a maximum of 100 modes and a frequency range of up to 5 kHz. In the harmonic response section, I applied a remote load to the tips, where each tip carries a remote force and moment, corresponding to the considered motor speed. The software defaulted to using the mode superposition method for the solution. For displacement calculation, I utilized the deformation frequency response and considered the inner and outer faces of the cylindrical frame in the scope section. Is this the correct approach to calculate motor displacement or velocity due to vibration?