|Outer rotor Surface Permanent Magnet Synchronous Machine (SPMSM)
|Run-up at max torque under non sinusoidal supply
Noise is measured at passenger seat close to electric powertrain.
Sound file and spectrograms
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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.