| Application | Subway |
| Electrical machine | Outer rotor Surface Permanent Magnet Synchronous Machine (SPMSM) |
| Supply condition | Run-up at max torque under non sinusoidal supply |
| Noise sources | Electromagnetic, mechanical |
| See also |
Measurement set-up
Noise is measured at passenger seat close to electric powertrain.
Sound file and spectrograms
Sound of a traction synchronous machine during run-up
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E-NVH interpretations
This sound file illustrates electromagnetically-excited noise of a synchronous motor. High pitch, whistling noise is due to resonances between pole/slot electromagnetic excitations and the outer rotor structural modes. The PWM effects cannot be heard and a significant part of the noise comes from open circuit operation.