Micro-vibration control strategy of magnetically suspended rotor system using finite dimension adaptive filter

For the influence of residual unbalance and sensor error on the micro-vibration control accuracy of magnetically suspended rotor system, a high-precision harmonic vibration force suppression method using finite dimension adaptive filter is proposed. The double-input finite dimension adaptive filter is constructed by using the orthogonal characteristic of the output signals of the rotor radial X and Y displacement sensors. On the basis of harmonic current suppression, the power amplifier is taken as a controlled object, and a displacement stiffness force feedforward compensation loop is constructed. The influence of the low-pass characteristic of the power amplifier is fully considered, and the error free tracking characteristic of the adaptive filter is used to make the deviation of the synchronous input signal zero, and then the high-precision compensation of the synchronous displacement stiffness force is realized. In addition, by changing the gain factors of different sub-filters, the suppression effect at each harmonic frequency can be guaranteed, and finally the micro-vibration control of the magnetically suspended rotor system can be further realized. The feasibility and effectiveness of this method are verified by experimental research.