Aiming at the problem of large third harmonic disturbance existing in magnetically suspended highspeed centrifugal blowers
a novel method based on synchronous rotating frame transformation to suppress the harmonic disturbance is proposed. Harmonic disturbance suppression for radial 4-degree of freedom( DOF)including translation and rotation is studied respectively to select and filter the third harmonic disturbance. The method of variable reconstruction is used for system modeling. The convergence and stability of the system are analyzed. A novel method of the application of variable reconstruction is proposed. Simulation results show that
compared to the traditional adaptive notch filter
the notch filter which based on synchronous coordinate transformation has similar notch precision at medium speed and high speed. However
it has better dynamic performance and less calculation amount.