Assessments of magnetic cross-coupling impacts on interior permanent magnet machine controls for electric vehicles

Performance investigations and drive designs of an interior permanent magnet (PM) machine, in both the constant torque and the flux-weakening operating regions, are generally conducted based on the machine parameters that are calculated from finite element analysis (FEA). To properly select the optimal current control angles for maximum torque generations at various speeds, this paper presents thorough assessments of the magnetic cross-coupling impacts of the interior PM machine from different calculation schemes. In addition, analytical models based on direct and indirect finite element calculations of the machine characteristics at those severe magnetic saturation conditions will be devised to provide a reliable on-line operational control reference.