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Open AccessArticle

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

1
Domain of Mechanical Systems Engineering, Graduate School of Science, Ibaraki University, 4-12-1, Nakanarusawa, Ibaraki, Hitachi 319-1222, Japan
2
Department of Artificial Organs, National Cerebral and Cardiovascular Center Research Institute, 5-7-1, Fujishiro-dai, Suita, Osaka 565-8565, Japan
*
Author to whom correspondence should be addressed.
This paper is an extended version of our paper published in: Osa, M.; Masuzawa, T.; Orihara, R.; Tatsumi, E. Magnetic suspension performance enhancement of ultra-compact 5-DOF-controlled self-bearing motor for rotary pediatric ventricular assist device. In Proceedings of the 16th International Symposium on Magnetic Bearings (ISMB16), Beijing, China, 13–17 August 2018.
Actuators 2019, 8(2), 31; https://doi.org/10.3390/act8020031
Received: 15 February 2019 / Revised: 28 March 2019 / Accepted: 13 April 2019 / Published: 15 April 2019
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. View Full-Text
Keywords: axial gap; self-bearing motor; double stator structure; 5-degrees of freedom active control; design refinement; ventricular assist device; pediatric axial gap; self-bearing motor; double stator structure; 5-degrees of freedom active control; design refinement; ventricular assist device; pediatric
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Osa, M.; Masuzawa, T.; Orihara, R.; Tatsumi, E. 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 2019, 8, 31.

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