Optimization procedure for identifying constitutive properties of high speed induction motor

In order to predict the rotordynamics of a high speed induction motor in bending, an optimization procedure is proposed for identifying the constitutive properties especially those of the magnetic core made of lamination stack, tie rods, short-circuiting rods, etc. Modal parameters predicted by a finite element model based mainly on beam elements, and measured on an induction motor are included in modal error functions contained in a functional. The minimization of this functional by using the Levenberg-Marquardt algorithm permits extracting the constitutive properties along the magnetic core.