A precision spindle system supported by active magnetic bearings is designed. The system consists of a rotor, two radial and one axial magnetic bearings, a motor, five proximity probes, which measure the rotor position, and the P-D control unit. The total system is modelled as a five degrees-of-freedom system and the P-D contol gains are tuned such that the stable and satisfactory operation of the system can be achieved.
The designed system is successfully operated beyond 10,000 rpm in the labertory. And it is found that the experimental results well coincide with the analytically predicted results regarding the system stability and performance.
