Nonlinear Torque Modeling for Bearingless Switched Reluctance Motor Considering Magnetic Saturation

Abstract

The analytical model of torque considering magnetic saturation is proposed for 12/4 type bearingless switched reluctance motor (BSRM) to reflect the characteristic of the nonlinear system. The model is used to calculate torque instead of finite element methods that cause the high computational cost. The inputs of analytical model are mechanical parameters and material properties of the BSRM, which can obtain the torque at the inductance rising region. The analytical model is applicable for the calculation of torque under different motor parameters, i.e. currents and degrees. Magnetic saturation feature and procedure for torque are provided. The torques calculated by the proposed analytical model are compared with the finite element method results under different motor parameters. Finally, FE model results of torque under magnetic saturation are implemented to validate the effectiveness of the proposed modeling method.