Axial Synchronous Current Suppression of Maglev High speed Motor Using Adaptive Notch Filter

Affected by the radial coupling disturbance, the axial displacement of the active magnetic bearings (AMBs) system will contain the rotation speed signal, which may lead the power amplifier saturation when the maglev high-speed motor rotates at high speed. To solve this issue, an axial synchronous current suppression method based on adaptive notch filter (ANF) combined with speed estimation algorithm is proposed in this paper and the influence of ANF parameters on the estimation result is analyzed. Simulation and experimental results show that the proposed method can estimate the rotational speed accurately and suppress the axial synchronous current effectively, ensuring the high speed and stable operation of the maglev high-speed motor.