Noise of a traction synchronous motor at full load

Summary of e-NVH sound sample
Electrical machineOuter rotor Surface Permanent Magnet Synchronous Machine (SPMSM)
Supply conditionRun-up at max torque under non sinusoidal supply
Noise sourcesElectromagnetic, 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.