Working point - I, PSI, N

1. Positioning and objective

The aim of the test “Mechanics – NVH – Working point – I-Ψ-N” is to perform NVH analysis of the machine when operating at the targeted working point defined with the following inputs values I,Ψ,N (Magnitude of current, Control angle, Speed).

“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 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.

The following table helps to classify the test “Mechanics – NVH – Working point – I-Ψ-N”.

2. User inputs

The three main user input parameters are the supplied line current, the control angle and the speed. In addition, winding must be set.

3. Main outputs

Test results are illustrated with data, graph, and tables.

1. Tables of results

   • Machine performance - Working point defined with I-Y-N

2. Graphs, curves, and maps to illustrate NVH analysis results

   • Modal analysis
   • Radiation efficiency
   • Space-Time normal flux density in the airgap
   • Space-Time Maxwell pressure
   • Radiated sound power
   • Electromagnetic forces on teeth