Performance Enhancement of a Magnetic System in a Ultra Compact 5-DOF-Controlled Self-Bearing Motor for a Rotary Pediatric Ventricular-Assist Device to Diminish Energy Input

Actuators

Eisuke Tatsumi¹  Toru Masuzawa²  Masahiro Osa²  Ryoga Orihara² 

[1] Department of Artificial Organs, National Cerebral and Cardiovascular Center Research Institute, 5-7-1, Fujishiro-dai, Suita, Osaka 565-8565, Japan;Domain of Mechanical Systems Engineering, Graduate School of Science, Ibaraki University, 4-12-1, Nakanarusawa, Ibaraki, Hitachi 319-1222, Japan;

关键词: axial gap;    self-bearing motor;    double stator structure;    5-degrees of freedom active control;    design refinement;    ventricular assist device;    pediatric;   

DOI  :  10.3390/act8020031

来源: DOAJ

【 摘 要 】

Research interests of compact magnetically levitated motors have been strongly increased in development of durable and biocompatible mechanical circulatory support (MCS) devices for pediatric heart disease patients. In this study, an ultra-compact axial gap type self-bearing motor with 5-degrees of freedom (DOF) active control for use in pediatric MCS devices has been developed. The motor consists of two identical motor stators and a centrifugal levitated rotor. This paper investigated a design improvement of the magnetic circuit for the self-bearing motor undergoing development in order to diminish energy input by enhancing magnetic suspension and rotation performances. Geometries of the motor were refined based on numerical calculation and three-dimensional (3D) magnetic field analysis. The modified motor can achieve higher suspension force and torque characteristics than that of a previously developed prototype motor. Oscillation of the levitated rotor was significantly suppressed by 5-DOF control over rotating speeds up to 7000 rpm with lower energy input, indicating efficacy of the design refinement of the motor.

【 授权许可】

Unknown