Unbalance Compensation for Active Magnetic Bearing Rotor System Based on Phase Shift Reduced-Order Generalized Integrator

During the operation of the active magnetic bearing (AMB) system, synchronous vibrations resulting from rotor mass unbalance present a substantial challenge. To enhance the precision of levitation control and effectively reduce rotor vibration, this article establishes a dynamic model of a magnetic levitation rotor with unbalanced mass and analyzes the primary causes of unbalanced vibration. Based on this, an unbalance compensator using a phaseshifted reduced-order generalized integrator (PSROGI) is designed. This compensator takes the signals from the radial X- and Y-channel displacement sensors of the rotor as inputs, significantly reducing the computational load. By detecting the orthogonal synchronous components in the sensor output signals, the compensator can simultaneously compensate for the unbalanced forces in both channels, thereby reducing rotor displacement vibration. In addition, the introduction of a phase shift angle broadens the stability range of the algorithm. Simulation and experimental results show that the proposed strategy can effectively suppress the synchronous components in the rotor displacement signals over a wide speed range.