NDLI: Composite ferrite/steel bar magnets

Content Provider	IEEE Xplore Digital Library
Author	Hill, J.
Copyright Year	1965
Abstract	The design of large bar magnets for producing field at a distance is examined. One of the applications now being considered is the temporary degaussing of merchant ships, where conventional coil systems would be too difficult and expensive to install. Among possible magnet materials, ferrite is stabler and far cheaper than conventional alloys such as Alnico 5. However, it has a comparatively low magnetic moment/mass ratio (MMR), which is a disadvantage in mobile applications. To overcome this disadvantage ferrite is combined with mild steel. Simple magnetostatic analysis indicates that the overall MMR may be optimized to reach the Alnico value. An early composite magnet of simple design gave a lower MMR result, but lost no moment in a year of field testing. The present design consists basically of mild steel rods alternated with ferrite disks. Its proportions are optimized theoretically so as to raise the MMR nearly to the Alnico value, which is confirmed by experiment. Prospective manufacturing details for magnets of size 0.5-5 tons are outlined.
Sponsorship	IEEE Magnetics Society
Starting Page	1054
Ending Page	1058
Page Count	5
File Size	509146
File Format	PDF
ISSN	00189464
Volume Number	14
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1978-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ferrites Steel Magnets Magnetic materials Marine vehicles Coils Magnetic moments Magnetostatics Magnetic analysis Testing
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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