Torque and loss calculation of rotating machines considering laminated cores using post 1-D analysis

The post 1-D analysis for laminated cores is developed for accurate estimation of torque and loss in rotating machines. The nonlinear eddy current analysis along the thickness of the electrical steel sheets in the core is carried out at each element in the main finite element analysis in order to estimate the loss and the harmonic torques caused by the eddy currents and the hysteresis phenomenon in the core. The proposed method is applied for several kinds of rotating machines. It is revealed that the accuracy of the torque and loss at high speed conditions significantly improved by the proposed method compared to that of the conventional finite element method.