Linear Active Disturbance Rejection Decoupling Control of Bearingless Flux-Switching Permanent Magnet Motors Based on System Model Assistance

Since the winding and permanent magnet of bearingless flux-switching permanent magnet motors are located on the stator, the composition of the air gap magnetic field is complicated, which makes the mutual coupling problem of suspension and rotation of the motors prominent, causing the control performance of the suspension and rotation to be affected. Therefore, based on the rotor dynamics model, a decoupling control strategy based on finite element analysis (FEA) and linear active disturbance rejection theory is proposed. First, according to the structure of the motors and the FEA results, the stiffness matrix of the motor suspension plane coupling itself and its coupling with the rotation plane was obtained. Then, through rotor dynamics analysis, the kinematics model of the suspension system was obtained. Furthermore, the coupling stiffness matrix is combined with the active disturbance rejection theory to construct a decoupling control strategy for online self-tuning of key system parameters. The simulation and experimental results show that the proposed scheme has good dynamic performance and robustness while ensuring the precision of suspension control.