| Application | Subway |
| Electrical machine | DC Motor |
| Supply condition | Run-down under PWM |
| Noise sources | Electromagnetic, aerodynamic, mechanical |
| See also |
Measurement set-up
Noise is measured at passenger seat.
Sound file and spectrograms
Sound of a DC traction motor during braking phase with changes of PWM strategy
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E-NVH interpretations
This sound file illustrates acoustic noise experienced during braking phase of a subway. One can observe discontinuous changes of the main noise frequency, which shows that noise is driven by Pulse Width Modulation effects (change of the synchronous switching frequency according to converter strategy).
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.