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The noise radiated by an electrical motor is very different from the one generated by an internal combustion engine. It is characterized by the emergence of high frequency pure tones that can be annoying and badly perceived by future drivers, even if the overall noise level is lower than that of a combustion engine. A simulation methodology has been proposed, consisting in a multi-physical approach to simulate the dynamic forces and noise radiated by electric motors. The principle is first to calculate the excitation due to electromagnetic phenomena (Maxwell forces) using an electromagnetic finite element solver. This excitation is then projected onto the structure mesh of the stator in order to calculate the dynamic response. Finally, the radiated sound power is calculated with the aid of a standard acoustic finite element method. The calculation methodology assumes a weak coupling between the different physical levels. It has been validated by comparison with the experiment.

The automotive industry has entered a phase of change due to environmental considerations. Hybrid and electric vehicles are emerging and with them the need to include these new technologies in the design process, especially in numerical simulation methods. Different types of electromagnetic excitation may occur in electric machines. In particular, Maxwell pressure is responsible for radial forces applied to electric motor stators, which can cause a deflection and possible acoustic radiation. This paper describes a complete approach to simulate the noise radiated by electric motor stators. The principle of this multiphysics method is first to calculate the excitation due to electromagnetic phenomena using an electromagnetic finite element solver. This excitation is then projected onto the structure mesh of the stator in order to calculate the dynamic response. Finally, radiated sound power is calculated with the aid of a finite element method.

The noise radiated by an electrical motor is very different from the one generated by an internal combustion engine. It is characterized by the emergence of high frequency pure tones that can be annoying and badly perceived by future drivers, even if the overall noise level is lower than that of a combustion engine. Even if the excitation due to electromagnetic phenomena of electric motors is well known, the link to the dynamic excitation generating vibrations and noise is not done. The purpose of this work is to propose a multi-physical approach to simulate the dynamic forces and noise radiated by electric motors. The principle is first to calculate the excitation due to electromagnetic phenomena (Maxwell forces) using an electromagnetic finite element solver. This excitation is then projected onto the structure mesh of the stator in order to calculate the dynamic response. Finally, the radiated sound power is calculated with the aid of a standard acoustic finite element method.

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.