2015 Volume 23 Issue 1 Pages 199-205
Bearingless motors are required in semiconductor manufacturing, space applications, and medical devices as centrifugal pumps, reaction wheels and artificial hearts, respectively. Two-axis actively regulated bearingless motors have the advantages of low cost and small size compared with five-axis ones. The axial vibration is a serious problem in two-axis actively controlled bearingless motors because the axial direction is passively stabilized. In this paper, one of the factors of the axial vibration with open-loop speed regulation is found. A block diagram of axial movement and d-axis current with interference is shown. In the experiments, the axial vibration suppression is realized. Therefore the stable magnetic suspension is successfully achieved at 1200 r/min.
