Experimental Verification of the Hybrid Magnetic Bearing Operation

This paper discusses the proposal, realization, controlling system implementation and function verification of a hybrid magnetic bearing. The hybrid magnetic bearing in comparison with active and passive magnetic bearings exploits both passive and active magnetic fluxes. This type of bearing is not given too much attention in the literature despite of its many advantages. The issue of active and passive magnetic bearings is widely elaborated against the issue of hybrid magnetic bearings. The hybrid magnetic bearing is the special kind of a radial magnetic bearing. This magnetic bearing exploits permanent magnets to produce the basic magnetic flux acting the rotor and 3-phase double layer winding to influence this flux by an active magnetic flux. Basically, the hybrid magnetic bearing was developed for high speed bearing-less devices. According to that, we are expecting the achievement the highest rotor levitation stability in wide range of rotational speed and in various driving modes. The quality of the levitation is evaluated by international standards [ISO 14839]. In this paper, results of experimental verification of the levitation stability are presented.