Noise of electric vehicle (EV) powertrain - case of Renault Zoe

Summary of e-NVH sound sample
Application Renaut® Zoe
Electrical machine WRSM (48 stator slots, 4 poles)
Supply condition Run-up at max torque
Noise sources Electromagnetic, mechanical, aerodynamic
See also Nissan Leaf, Tesla X90

Measurement set-up

Noise is measured close to electric powertrain and at driver’s hear. A 3d accelerometer is placed on the stator housing in the middle of the lamination. A run-up is done with maximum torque up to 100 km/h in free field environment. Eco mode and AVAS options are not activated.

Sound file and spectrograms

Sound of Renault<sup>®</sup> Zoe electric powertrain during run-up at maximum torque
Sound of Renault® Zoe electric powertrain during run-up at maximum torque

Note: these sound files are the property of EOMYS; for authorized use in presentations, website, publications or technical work, please contact us

Sound pressure level spectrogram of Renault<sup>®</sup> Zoe electric powertrain during run-up at maximum torque close to engine (left) and at drivers's ear (right)
Sound pressure level spectrogram of Renault® Zoe electric powertrain during run-up at maximum torque close to engine (left) and at drivers’s ear (right)

E-NVH interpretations

This sound file illustrates electromagnetically-excited noise of the electric powertrain of Renault Zoe EV. High pitch, whining noise with increasing frequency is due to pole/slot electromagnetic excitations. Higher frequency sound occuring around 10 kHz is due to PWM effects with asynchronous switching frequency. Some resonances can be visible in the spectrogram near 4.8 and 5.2 kHz which corresponds to the match between electromagnetic forces wavenumbers r=0 and r=GCD(Zs,2p)=4 with circumferential stator modes 0 and 4.

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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