Electromagnetically-excited noise and vibrations in automotive applications (electric vehicles 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:

- electrical traction motors
- alternators, starters, e-booster (high speed electrical turbocharger)
- electrified axles for trucks
- motors for electric power steering (EHPS), differential gears, e-clutch (electrified Dual Clutch Transmission)
- steering motors for seats, head-rest, safety belt
- window lift motors, sliding roof drives, wiper motors, door lock actuators
- capacitors, inductors, transformers
- piezoelectric injectors, electrical pumps
- motors for radiator cooling fan modules (CFM)
- electrodynamic braking EMB

In some cases, it is more important to reduce the degree of subjective annoyance (e.g. roughness decrease) and to control the acoustic noise psychoacoustic effects (e.g. to induce a sensation of high quality drivetrain, or high acceleration), rather than decrease the overall noise level. EOMYS knows about psychoacoustics of e-machines and their associated influential electrical system design parameters.

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 realizing technical trainings on the control of electromagnetically-excited noise and vibration.

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