Analytical multiphysics model for NVH prediction of a high-speed Surface-Permanent Magnet Synchronous Machine

As demands for electric motor efficiency keep increasing, Electric Vehicle (EV) manufacturers are striving to design smaller and more power-dense machines, able to maintain performance standards through high-speed operation. However, increased operating loads and speeds in excess of 10,000 rev/min results in the amplification, or introduction of new noise components, which necessitate novel prediction techniques. The use of traditional finite element (FE) based optimisation methodologies therefore becomes challenging due to extensive computational loads. In this work, an analytical multi-physics methodology for e-NVH prediction of typical high-speed Surface-mounted Permanent Magnet Synchronous Machines (S-PMSMs) is presented. The model comprises analytical electromagnetics and vibro-acoustics to determine the radiated airborne noise of SPMSMs at speeds above 10,000 rev/min and correspondingly high frequencies. Preliminary results are presented to highlight the efficiency of the proposed method.