Abstract
This article introduces a spatial-harmonic model for analyzing high-frequency vibrations induced by PWM-current harmonics in inverter-fed surface permanent magnet synchronous motors (PMSMs). The model provides a fresh perspective on calculating high-frequency vibrations of motors with a fixed inverter switching frequency. Electromagnetic (EM) forces along stator boundaries are first calculated utilizing the permeance distribution function (PDF). Then, the concept of spatial-order-excitation transfer functions (SOETFs) is introduced to facilitate the modelling of the motor vibrational response under distributed excitation forces. Two approaches to obtain SOETFs are subsequently investigated, one by finite-element analysis while the other by experimental identification. Finally, high-frequency vibrations predicted by the proposed model are validated by experiments, showing a high degree of accuracy.
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