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Design of a flux focusing axial magnetic gear

Author: Vedanadam Mudumbai Acharya; University of North Carolina at Charlotte. Department of Electrical and Computer Engineering.
Publisher: ©2013.
Dissertation: M.S.E.E. University of North Carolina at Charlotte 2013
Edition/Format:   Thesis/dissertation : Thesis/dissertation : Manuscript   Archival Material : English
Summary:
Magnetic gears have been attracting the focus of many researchers because of their potential for high efficiency and their ability to produce high torque density without physical contact. This thesis presents the design and analysis of a novel flux focusing axial magnetic gear. Using rare-earth magnetic material it is calculated that the axial magnetic gear could achieve a torque density of up to 290Nm/L while  Read more...
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Details

Material Type: Thesis/dissertation, Manuscript
Document Type: Book, Archival Material
All Authors / Contributors: Vedanadam Mudumbai Acharya; University of North Carolina at Charlotte. Department of Electrical and Computer Engineering.
OCLC Number: 877869133
Notes: UNC Charlotte Libraries notes:
jt 042214
Description: 93 leaves : illustrations ; 29 cm
Responsibility: by Vedanadam Mudumbai Acharya.
Local System Bib Number:
System.Supplied@2014-04-22,08:47:10

Abstract:

Magnetic gears have been attracting the focus of many researchers because of their potential for high efficiency and their ability to produce high torque density without physical contact. This thesis presents the design and analysis of a novel flux focusing axial magnetic gear. Using rare-earth magnetic material it is calculated that the axial magnetic gear could achieve a torque density of up to 290Nm/L while operating with a low torque ripple. A non-fractional gear ratio with a repeated decimal point is used that minimizes the non-fundamental components of the field harmonics thereby reducing the torque ripple. A parametric sweep of the geometric parameters was conducted in order to maximize the volumetric and mass torque density. An axial type of magnetic gear has potential advantages when compared to its radial counterpart such as ease of cooling and the ability to stack-up a number of rotors in order to create multistage gearbox. The considerable challenges of axial magnetic gears are torque ripple and axial forces. The former causes vibrations and later causes deflection of modulation rotor bars. In addition to the axial magnetic gear design, a 3-D analytic based field modeling approach for both radial and axial magnetic couplings has been developed using fictitious magnetic charge sheets. The presented design equations will enable scaling analysis to be conducted for axial and radial magnetic devices. The derived equations have been verified by comparing them with a charge sheet model designed using the finite element method.
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