Magnetic bearings have many advantages, such as no friction and abrasions, no lubrication and no sealing, high speed, high precision and long service life, and so on, which have innovated the traditional supporting forms fundamentally. In this dissertation, a novel AC-DC 3-degree freedom hybrid magnetic bearing (HMB) is proposed, which is driven by DC in axial direction and AC provided by a three-phase power converter in both radial directions respectively, and just one common permanent magnet ring provide...