Efficient nonlinear modelling of spatial flux harmonics of squirrel cage induction motors using inverse flux maps and static FEA

In this paper a new method for efficient generation of fundamental and harmonic flux maps of squirrel cage induction motors is presented. The maps are generated only by using static finite element analysis in the rotor current reference frame. Thereby, symmetries of the flux linkages are analyzed to further reduce the calculation effort. This enables efficient simulation, real time modelling and control of induction motors including saturation effects and spatial harmonics. This is achieved by using a machine model based on inverse flux mapping.