Procedure to Define an Accurate Model for Saturation and Cross-Coupling in Interior Permanent Magnet Machines

Interior Permanent Magnet (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 link ψ̅
_sdq
(i̅
_sdq
), where i̅
_sdq
and ψ̅
_sdq
(i̅sdq), and the inverse ψ̅
_sdq
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.