Lorentz Force type Self-Bearing Motor for Centrifugal Heart Pump

Highly efficient Lorentz force type self-bearing motor is developed. High rotor pole flux density and ampere turns of stator coils are the key technology for strong levitated motor. For this purpose Halbach magnet array and pressed flat coils are used to get high performance. The coil thickness is only 1.6 [mm] with one coil winding of 66 turns. The peak flux density in air gap is about 0.6 [T]. The rotor can run up to 9,000 [rpm] with maximum efficiency over 70 [%]. This self-bearing motor is tried to apply to the centrifugal heart pump.