Optimization Modeling of Single-Degree-of-Freedom Magnetic Suspension Force for Single-winding Bearingless Brushless DC Motor

In order to provide a theoretical basis for the precise control of single-winding bearingless permanent magnet brushless DC motor (BL-BLCDM). In this paper, the optimization modeling method of single-winding BL-BLCDM single-degree-of-freedom radial magnetic suspension force mathematical model is studied. First, the structure and working principle of single-winding BL-BLCDM are introduced. Then, the air gap magnetic field after slotting the stator of the motor is analyzed. In order to facilitate the mathematical modeling and analysis, and considering the influence of cogging effect on the air gap magnetic field, this paper introduces the correction factor of the air gap magnetic field, and completes the optimization and correction of the mathematical model of radial magnetic suspension force. Finally, the FEM was used to verify and analyze the optimal math model. The results show that the calculation results of the radial magnetic suspension force optimization model are basically consistent with the FEM simulation results.