NVH evaluation – Working point and Spectrogram

Positioning and objective

Two tests have been added for performing NVH analysis on the machine when operating at a targeted working point or a set of targeted working points defined with the following input values If, I,Ψ,N (Magnitude of field current, magnitude of current, Control angle, Speed)

The process and the workflow are the same as what has already been done for other synchronous machines.

These tests give data allowing NVH prediction in the early electromagnetic and design stage.

The modal analysis of the stator mechanical structure, the radiated sound power and the magnetic forces applied on teeth are computed and displayed.

This test helps to answer the following question: Could the machine have any risks in connection with NVH? Yes / No.

Here is an illustration that gives an overview of the test NVH – Working point (If, I,Ψ,N):

Mechanics – NVH – Working point (If, I, Ψ,N) - Overview

Mechanics – NVH – Working point (If, I, Ψ,N) – Magnetic forces on teeth versus rotor angular position

Here are illustrations which give an overview of the test NVH – Spectrogram (If, I,Ψ,N):

Mechanics – NVH – Spectrogram (If, I, Ψ,N) - Overview

Mechanics – NVH – Spectrogram (If, I, Ψ,N) - Test results