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The noise radiated by electrical machines is due to the electromagnetic excitations applied to the structure of the machine. Even if the generated sound power levels are not as high as those typically emitted by internal combustion engines, they are characterized by the emergence of high frequency pure tones that can be annoying and badly perceived by users. The radiated noise is influenced by many parameters related to the structure and electromagnetic design of the machine. The supply strategy can play a key role as well. This paper present a 3-step simulation process. Electromagnetic excitations are estimated (finite element software) and projected onto the structure model of the machine. Dynamic response under realistic electromagnetic can be calculated. The last step is about the calculation of the radiated noise with the aid of typical acoustic methods.