Magnetic Suspension Active Disturbance Rejection Control Strategy of a Six-Phase Bearingless Permanent Magnet Synchronous Motor

Aiming at the contradiction between overtone and rapidity of the suspension system of bearingless permanent magnet synchronous motor (BL-PMSM), an active disturbance rejection control (ADRC) strategy of the suspension system was proposed based on 12-slot 2-pole single-winding six-phase BL-PMSM. Firstly, the structure and working principle of single-winding six-phase BL-PMSM were analyzed, and the mathematical models of electromagnetic torque and radial suspension force were established. Then, the ADRC technology is introduced into the single-winding six-phase BL-PMSM system, and the ADRC strategy of radial displacement is researched and designed. Finally, Matlab/Simulink is used to analyze the simulation experiment of single-winding six-phase BL-PMSM system. The results show that the proposed ADRC strategy can not only realize the stable suspension of the rotor and suppress the influence of radial force disturbance effectively, but also has the characteristics of fast radial displacement response, small overshoot and strong robustness.