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A method to efficiently synthesize electromagnetically excited vibrations in electric drives is explored in this paper. The process integrates well into a drive system's design phase and allows to characterize the vibrations over the entire torquespeed range. The study is performed on a traction drive for a hybrid electric vehicle. The influence of different force excitation shapes on the resulting overall vibration is shown and the importance of including tangential forces in the synthesis process is highlighted. The resulting operational deflections at selected operating points are then analyzed. Finally, acoustic maps are introduced as a means to represent and compare predicted and measured acoustic characteristics of speed-variable drives. The synthesized acoustic maps are validated by comparison against their measured counterparts.

The interdisciplinary task of assessing the acoustic characteristics of electrical drive-systems gains importance in traction, industrial and consumer applications. This study presents a universal acoustic modelling framework for efficient, high-quality acoustic modelling of electrical drives. The objective is to make drive acoustic modelling and assessment of an integral part of drive-system design. The approach integrates directly into the general drive-system design process and can be applied to all types of machines (synchronous, induction, switched reluctance and direct current). Inverteroperation-related switching frequencies and spatial machine harmonics are routinely taken into account. The process is applicable to machines with rotor or stator skew as well as to outer-rotor and transversal-flux machines. It combines the two fast and user-interactive steps system simulation and vibration synthesis. The underlying model parameters are obtained via automated offline finite-element simulations based on generic input parameters. This allows using complex electromagnetic and structural models without computation time becoming prohibitive. Application examples are given for permanent magnet synchronous machine traction drives for (hybrid) electric vehicles as well as a for a switched-reluctance auxiliary drive. Simulated run-up spectrograms for structure-borne sound are validated against measurements and operational deflections are presented.

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