Impact of iron losses on parameter identification of permanent magnet synchronous machines

Highly utilized permanent magnet synchronous machines (PMSMs) often show a significant inductance variation near and above the rated current values due to saturation. For precise modeling and control, the change in the parameters has to be considered by means of look-up tables. To parameterize these look-up tables, the inductances and the stator resistance have to be identified for various current set points. However, iron losses interfere with a precise identification if they are not considered. Therefore, an extended model is introduced to derive an identification method that considers and compensates for these effects. Measurement results prove the effectiveness of the proposed method.