Characterizing A Compact 5-DOF controlled Self-Bearing Motor with Modified Magnetic Circuit to Improve Suspension Performance for Pediatric VAD

摘要

Compact mechanical circulatory support (MCS) devices, such as continuous flow rotary blood pumps, have been clinically demanded for pediatric heart treatment. In this research, a miniaturized 5-degrees of freedom (DOF) controlled double stator maglev motor is undergoing development for use in pediatric MCS devices which have high durability and better blood compatibility. This paper reported improvement of the 5-DOF controlled maglev motor by modifying the magnetic circuit to enhance magnetic suspension performance and energy efficiency. The static suspension characteristics and energy efficiency of the developed motor with modified magnetic circuit were then investigated. The axial suspension force and the inclination torque were increased by more than 45%. The input power was reduced by 1-5 W, and the motor efficiency increased by 5-8%. The significantly improved suspension force and energy efficiency due to design refinement indicated feasibility of high performance next generation pediatric MCS device.