|Application||Scott® “syncros” moutain e-bike, Scott® “e-sub” urban e-bike, Wayscral® urban e-bike|
|Supply condition||Run-up at max torque|
|Noise sources||Electromagnetic, mechanical|
Noise is measured 40 cm away from the electric powertrain, on the electric bikes. A run-up is done up to 20 km/h with different electric power modes.
The following electric bikes are tested:
Sound file and spectrograms
Sound of electric powertrain of Scott® “syncros” moutain e-bike
Sound of electric powertrain of Scott® “e-sub” urban e-bike
Sound of electric powertrain of Wayscral® urban e-bike
Note: these sound files are the property of EOMYS; for authorized use in presentations, website, publications or technical work, please contact us
These sound files illustrate electromagnetically-excited noise due to the electric traction motor of different electrically-assisted bikes. Besides low frequency gravel noise due to tyre/road interaction, one can clearly hear the whine noise of the electric motor coming from Maxwell force harmonics. A second potential source of electromagnetic noise comes from PWM effects but the switching frequency of tested e-bikes is too high (18 kHz) to be heard by the driver.
Application to MANATEE
MANATEE software can be used to quickly calculate NVH due to electromagnetic forces both in early design and detailed design phase, including PWM and slotting effects.