Authors : Anand Mathiyalagan; Mahesh Babu; Thulasirajan

Volume/Issue : Volume 11 - 2026, Issue 5 - May

Google Scholar : https://tinyurl.com/5n9bnfjk

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DOI : https://doi.org/10.38124/ijisrt/26May396

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Abstract : This study investigates the electromagnetic noise and vibration characteristics of a ten-pole, twelve-slot Permanent Magnet Synchronous Motor (PMSM), with particular attention to the influence of stator ovalization. In this topology, the inherent two-lobe structural modes strongly interact with the dominant electromagnetic spatial force harmonic of space order two. This harmonic originates from the fundamental electromagnetic excitation caused by the rotor permanent magnets and slotting and cannot be eliminated through design modifications, making the interaction unavoidable. A simulation-driven workflow was developed to quantify these effects. Electromagnetic analyses were carried out in Dassault Manatee under open-circuit conditions, and the resulting radial and tangential Maxwell stresses were mapped onto the stator inner-tooth surface. These stresses were subsequently coupled with detailed modal parameters extracted from ANSYS to predict vibration velocity and sound pressure levels. Results show that stator ovality significantly amplifies the space-order-two force component, leading to higher modal participation of the two-lobe deformation mode and resulting in increased noise radiation. The proposed workflow provides a reliable approach for predicting electromagnetic NVH behaviour across various deformation scenarios without requiring physical testing.

Keywords : e-NVH, Electromagnetic forces, PMSM, Stator ovalization, Vibration analysis, Manatee, ANSYS.

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