Electromagnetically-excited noise and vibrations in automotive applications (electric vehicles EV/HEV NVH)

Vehicle Noise, Vibration and Harshness (NVH) can involve electromagnetically-excited acoustic noise and vibrations, as well as noise and vibration of electric machines.

Current automotive products already include many electrical systems, but the development of hybrid traction and full electric traction (HEV/EV) and the replacement of hydraulic actuators by electrical actuators increase the presence of on-board electromechanical devices and passive electrical components.

The following automotive components can vibrate and make unpleasant acoustic noise due to electromagnetic forces (e-NVH issues):

- electric traction motors or generators in in electric powertrain and Electric Drive Units (EV/HEV)
- alternators, starters, e-booster (high speed electrical turbocharger)
- electrified axles, e-motors in ancilliaries
- ABS drives and electric pumps
- motors for electric power steering (EHPS), differential gears, e-clutch (electrified Dual Clutch Transmission)
- steering motors for seat adjuster, head-rest, safety belt, sunroof
- window lift motors, sliding roof drives, tailgate electric motors, wiper motors, door lock actuators, parking locks
- motors for radiator cooling fan modules (CFM)
- capacitors, inductors, transformers
- piezoelectric injectors

In some cases, it is more important to reduce the degree of subjective annoyance and to control sound quality psychoacoustic metrics, rather than decrease the overall noise level. With an experience on more than 80 EV/HEV NVH projects, EOMYS is a key partner to solve e-NVH issues at early design stage or after manufacturing.

EOMYS can characterize the NVH behaviour of electric motors and electric components with specialized electrical, vibration and acoustic measurements, and can offer both electrical engineering and mechanical noise reduction solutions. EOMYS also works at design stage helping the electrical engineers to assess the NVH performances of these components (for instance with MANATEE simulation software), and performing technical trainings on the control of electromagnetically-excited noise and vibration and more especially troubleshooting EV/HEV NVH issues.

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