Study on the influence of remanence on suspension control of magnetic suspension rotor

Ferromagnetic material itself has hysteresis property, which produces remanence in some applications. Through practical cases, this study analyzes the influence of residual magnetism on the suspension of magnetic suspension rotor during operation. Firstly, the causes of remanence are explained. Secondly, the remanence is simulated by permanent magnet, and the experiment of remanence affecting the suspension of magnetic suspension rotor is carried out, the results of which are compared with the simulation. Finally, the relationship among remanent magnetic field, magnetic suspension bearing control magnetic field and air gap is studied, and the critical value of ratio of remanent magnetic field to control magnetic field is obtained under different air gaps. By modifying the structure and material of magnetic suspension rotor in actual cases, the influence of residual magnetism on the suspension of magnetic suspension rotor is avoided, and the correctness of the study is verified.