Miniaturized Magnetically Levitated Motor for Pediatric Artificial Heart

An axially levitated motor has been developed for use in pediatric artificial hearts. The developed axially levitated motor consists of a top stator, bottom stator, and levitated rotor impeller. The developed motor has an outer diameter of 24 mm and a total length of 41 mm. The motor was designed based on three dimensional magnetic field analysis. The target axial attractive force of the levitated motor is 10 N, and a torque of 1 mNm at a rotational speed of 4000 rpm. The developed motor produces an axial attractive force of 10.6 N, and a torque of 5.8 mNm respectively. Experimental results display sufficient magnetic suspension capability and rotational performance of the levitation system for a pediatric ventricular assist device.