Noise of electric bikes

Summary of e-NVH sound sample
Application Scott® "syncros" moutain e-bike, Scott® "e-sub" urban e-bike, Wayscral® urban e-bike
Electrical machine Unknown
Supply condition Run-up at max torque
Noise sources Electromagnetic, mechanical
See also

Measurement set-up

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:

Moutain e-bike
Moutain e-bike
Hybrid e-bicycle
Hybrid e-bicycle
e-bike
e-bike

Sound file and spectrograms

Sound of electric powertrain of Scott® "syncros" moutain e-bike
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 Scott® "e-sub" urban e-bike
Sound of electric powertrain of Wayscral® 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

E-NVH interpretations

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 MANATE

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.

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