A Double-Sided Stator Type Axial Bearingless Motor Development for Total Artificial Heart

This paper proposed a bearingless motor that has tilt control function and clarified its fundamental characteristics as a magnetically suspended motor and magnetically suspended pump. The rotor has eight permanent magnets (PMs) on each side (16 PMs in total). The two stators have 12 poles each with two types of concentrated windings. One is for motoring and axial control and the other is for tilt control. This bearingless motor has three degrees of freedom active positioning control. The theoretical analysis clarified operating principle and showed that the proposed motor could control translational motion, inclinational, and rotational movement independently. An experimental setup was fabricated, and the control performance of the self-bearing motor was also investigated. The fabricated prototype achieved a stable magnetically levitated rotation. In addition, the proposed axial self-bearing motor fabricated into a prototype of the magnetically suspended pump to investigate pump characteristics for a total artificial heart applications.