Abstract
In this study, we identified the noise sources of an in-wheel motor system and proposed a low-noise design guideline through structural modification. To identify the noise sources, we not only measured the noise and vibration signals, but we also performed modal testing. Using waterfall plots for the frequency spectra of noise and vibration signals, we identified the vibration excitation frequencies owing to the gear mesh and the motor electromagnetic force of the motor. We obtained the natural frequencies of the in-wheel motor system from the modal test results. The results of the signal analysis and modal test showed that noise was generated by the resonance between the excitation and natural frequencies. To avoid this resonance, we proposed a design guideline for noise reduction in an in-wheel motor system by using a finite element simulation.
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