Sound optimization of a converterfed drive system using an acoustic camera in combination with modal analysis

Purpose Modern variablespeed drive systems using frequency converters generate additional audible noise as a result of the voltages that are no longer sinusoidal. Using suitable measures, the purpose of this paper is to find an optimum for minimum noise radiation in the complete drive system. Designmethodologyapproach The main areas to concentrate on to achieve an optimum are the source of excitation itself the frequency converter, as well as the actual source of the noise, the motor. Optimization measures are drawnup using soundscaping with subsequent modal analysis of the actual state. The effectiveness of any changes made can be estimated using simulation techniques. This approach is confirmed by subsequently implementing the selected measures and verifying them by performing the appropriate measurements. Findings The paper takes care of the increasingly important field of converterfed drive systems and their special acoustical challenge. It shows a practical way to reduce audible noise combining measurements and simulations. Originalityvalue Combining the measurement of the acoustic camera with the simulation of modal shapes is a fast way for optimizing an inverterfed drive system.