2019 年 27 巻 3 号 p. 286-291
An artificial heart to which magnetic levitation technology is applying can suspend an impeller without contact has been researched and developed to achieve high durability and good blood compatibility. This paper introduces self-bearing motor and magnetically levitated centrifugal blood pump using it under development at National Institute of Technology, Ibaraki College. The self-bearing motor is a magnetic levitation motor whose stator has both motor and magnetic bearing functions. The plus minus two pole algorithm is adopted to levitate and rotate the rotor. Radial position of the rotor is controlled actively, and axial position of it is passively stable within the thin rotor structure. A magnetically levitated centrifugal blood pump using the radial type self-bearing motor has been developed for use as an implantable artificial heart. At the operating condition with a flow rate of 5 L/min against a pressure of 100 mm Hg, the oscillation amplitude in radial direction was 0.014 mm. And, the total power consumption was 7.2 W.
