Procedure to define an accurate model for saturation and cross-coupling in interior permanent magnet machines

IPM machines are characterized by high saturation and cross-coupling effect. In this paper a procedure is proposed to identify an IPM machine model able to taking into account in a simple and accurate manner both the cited effects. The model is based on functions that express the direct links psisdq(isdq), and the inverse link isdq(psisdq), where isdq and psisdq are the stator current and stator flux linkage space vectors respectively. The paper shows that such a model is helpful for the analysis of both steady state and transient operation.