The aim of the test “Mechanics – NVH – Spectrogram – I-Ψ-N” is to perform NVH
analysis on the machine when operating at a set of targeted working points defined
with the following inputs values I,Ψ,N (Magnitude of current, Control angle,
Speed).Figure 1. “Working point – Sine wave – Motor – I, Ψ, N ” illustration
This test gives data allowing NVH prediction in early electromagnetic and design
stage.
The modal analysis of the stator mechanical structure, the radiated sound power
spectrogram per engine order versus speed and the resulting overall weighted
radiated sound power versus speed are computed and displayed.
These results allow to see if there are any problems linked with NVH over the
considered speed range.
And finally, this test helps to answer the following question: Could the machine have
any risks in connection with NVH? Yes / No.
The following table helps to classify the test “Mechanics – NVH – Spectrogram –
I-Ψ-N”.
Table 1. Positioning of the test “Mechanics – NVH – Working point – I-Ψ-N”.
