All-coefficient Adaptive Control of Active Magnetic Bearing System Based on Characteristic Model

Due to nonlinear characteristics of electro-magnetic field, coupling of radial degree of freedom of rotor system and interference of rotor mode by specific frequency, the model of active magnetic bearing is uncertain. All-coefficient adaptive control (ACAC) strategy based on feature model can solve the problem of nonlinear, strong coupling and the stability of the system when the controlled object is excited to the unmodeled system, and the controller design is simple. In this paper, the all-coefficient adaptive control strategy based on feature model is applied to position control of active magnetic bearing flexible rotor system. In order to improve the dynamic performance of the controller, a new integrated controller combining ACAC control with active disturbance rejection controller (ADRC) is proposed to further improve the response speed of the system to disturbances such as burst load.