The invention relates to an electric main axle system of non-bearing non-motor magnetic digit-control machine, which can realize non-abrasion, high-speed, high accuracy and high power, and realize self-suspension and self-driving abilities of said main axle system, wherein it comprises a frame (4), a main axle (2), two rotor iron cores (5) sheathing the pushing disc (8) and two ends at the middle of main axle; the rotor iron cores (5) at two ends of main axle (2) and the stator (6) form the suspension and rotator of main axle; and it also comprises a suspension control system and a rotation-speed control system of main axle; the pushing disc (8) and the electromagnets (7) at two sides form the axial magnetic suspension bearing, and the axial position control system; the main axle system has compact structure, shortened axial length, to improve its rigidity and output power, and it can avoid using motor to drive, to realize the suspension and rotation of main axle. |