NDLI: Field analysis for a SMES magnet with radial force balance

Content Provider	IEEE Xplore Digital Library
Author	Smith Jr., J.L.
Copyright Year	2002
Abstract	The old concept of a radial force balanced coil is examined by calculating the magnetic force distribution from well known exact solutions of the quasi static magnetic field equations. The derived coil geometry is very nearly a torus of a circular cross section. The outside field has the distribution of a single poloidal line current which is a virtual image of a poloidal current sheet on the coil surface that terminates the outside field. The inside field is from a toroidal surface current that terminates the inside field. The J/spl times/B forces are all normal to the current sheets. The magnitudes of the current sheets are adjusted for radial force balance. For a radius ratio of 0.121, the resultant normal force is outward and uniform to about 4%. Thus a simple hoop structure around the minor circumference will support the coil. Vector addition of the two current sheets gives a helical surface current on the surface of the torus.<>
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	357
Ending Page	360
Page Count	4
File Size	398943
File Format	PDF
ISSN	10518223
Volume Number	5
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic analysis Samarium Superconducting magnetic energy storage Capacitive sensors Superconducting coils Toroidal magnetic fields Geometry Superconducting magnets Costs Conductors
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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