Development of a smaller and high-performance self-bearing motor for continuous-flow artificial heart

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A novel 5-DOF actively controlled self-bearing motor that combines the functions of a motor, two radial AMBs, and an axial AMB has been proposed and developed to achieve smaller size and higher performance simultaneously. A theoretical control forces were introduced and a prototype 5-DOF self-bearing motor was made using magnetic field analysis by finite element method Then the stable levitation with rotation was confirmed by experiments. In addition, outer rotor type 5-DOF self-bearing motor was analyzed. The prototype model was made and the experiments are still continuing. It is considered that the development of a smaller and high-performance 5-DOF self-bearing motor is highly feasible.