Noise of a traction induction motor under sinusoidal supply at no load

Summary of e-NVH sound sample
Electrical machineSquirrel cage induction motor (SCIM)
Supply conditionRun up under sinusoidal current at no load
Noise sourcesElectromagnetic, aerodynamic, mechanical
See also 

Measurement set-up

Noise is measured at 1 m from induction motor.

Sound file and spectrograms

Sound of a traction induction machine during run-up under sinusoidal supply

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E-NVH interpretations

This sound file illustrates the noise of an induction motor at starting in railway traction application, when fed by a sinusoidal voltage source (no effect of Pulse Width Modulation). High pitch, whining noise comes from slotting effects.