Magnetic drive pumps

In centrifugal pumps for artificial hearts, a magnetic drive with lightly loaded journal bearing system is often used. In such a system, the rigidity of the bearing is small and the impeller usually rotates over the critical speed. In such cases, the rotordynamic fluid forces play an important role for shaft vibration. In the present study, the characteristics of the rotordynamic fluid forces on the impeller were examined. The rotordynamic fluid forces were measured in the cases with/without the whirling motion. It was found that the rotordynamic forces become destabilizing in a wide range of positive whirl. The effect of leakage flow was also examined.

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A Magnetic Drive Actuator for Micro Electrical Discharge Machining

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.591-593.303 ◽

2012 ◽

Vol 591-593 ◽

pp. 303-306

Author(s):

Xiao You Zhang ◽

Akio Kifuji ◽

Dong Jue He

Keyword(s):

Electrical Discharge ◽

High Speed ◽

Degrees Of Freedom ◽

Electrical Discharge Machining ◽

Magnetic Coupling ◽

Magnetic Bearings ◽

Coupling Mechanism ◽

Micro Electrical Discharge Machining ◽

Long Stroke ◽

Magnetic Drive

Electrical discharge machining has the capability of machining all conductive materials regardless of hardness, and has the ability to deal with complex shapes. However, the speed and accuracy of conventional EDM are limited by probability and efficiency of the electrical discharges. This paper describes a three degrees of freedom (3-DOF) controlled, wide-bandwidth, high-precision, long-stroke magnetic drive actuator. The actuator can be attached to conventional electrical discharge machines to realize a high-speed and high-accuracy EDM. The actuator primarily consists of thrust and radial magnetic bearings, thrust and radial air bearings and a magnetic coupling mechanism. By using the thrust and radial magnetic bearings, the translational motions of the spindle can be controlled. The magnetic drive actuator possesses a positioning resolution of the order of micrometer, a bandwidth greater than 100Hz and a positioning stroke of 2mm.

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Shunting arc-produced hybrid plasma and its magnetic drive for PBII&D

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2006.09.092 ◽

2007 ◽

Vol 201 (15) ◽

pp. 6490-6494 ◽

Cited By ~ 5

Author(s):

K. Takaki ◽

S. Mukaigawa ◽

T. Fujiwara ◽

K. Yukimura

Keyword(s):

Hybrid Plasma ◽

Magnetic Drive

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Multi-chamber apparatus with a conveyor magnetic drive for determining the kinetics of dissolution of pharmaceutical forms

Izvestiâ vysših učebnyh zavedenij Priborostroenie ◽

10.17586/0021-3454-2021-64-4-329-338 ◽

2021 ◽

Vol 64 (4) ◽

pp. 329-338

Author(s):

L.Yu. Vodneva ◽

A.A. Vodnev ◽

O.B. Korotkov ◽

S.N. Lopaev ◽

V.A. Skorykh ◽

...

Keyword(s):

Kinetics Of Dissolution ◽

Kinetics Of ◽

Magnetic Drive

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Implantation and Retrieval of Magnetic Nanobots for Treatment of Endodontic Re-Infection in Human Dentine

10.26434/chemrxiv.14494914 ◽

2021 ◽

Author(s):

Debayan Dasgupta ◽

Shanmukh Srinivas Peddi ◽

Deepak K. Saini ◽

Ambarish Ghosh

Keyword(s):

Root Canal ◽

Treatment Method ◽

Therapeutic Modality ◽

Clinical Practices ◽

Human Teeth ◽

Dentinal Tubules ◽

Current State ◽

Human Dentine ◽

New Treatment ◽

Magnetic Drive

<div> <div> <div> <p>More than 10% of root canal treatments undergo failure worldwide due to remnant bacteria deep in the dentinal tubules located within the dentine tissue of human teeth. Owing to the complex and narrow geometry of the tubules, current techniques relying on passive diffusion of anti-bacterial agents are inadequate. Here, we present a new treatment method using actively maneuvered nanobots, which can be incorporated during standard root canal procedure. Our technique will enable dentists to execute procedures inside the dentine not yet possible by current state of the art. We demonstrate that magnetically driven nanobots can reach the depths of the tubules up to hundred times faster than current clinical practices. Subtle modifications of the magnetic drive allowed deep implantation of the nanobots isotopically distributed throughout the dentine, along with spatially controlled retrieval from selected areas. Finally, we demonstrate the integration of bactericidal therapeutic modality with the nanobots, thereby validating the tremendous potential of nanobots in dentistry, and nanomedicine in general. </p> </div> </div> </div>

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