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Title: Transient magnetic field and temperature modeling in large magnet applications

This paper discusses a coupled magnetic/thermal model developed to study heat and magnetic field diffusion in conducting materials subject to time-varying external fields. There are numerous applications, both military and commercial. These include: energy storage devices, pulsed power transformers, and electromagnetic launchers. The time scales of interest may range from a magnetic field pulse of a microsecond in an electromagnetic launcher, to hundreds of seconds in an energy storage magnet. The problem can be dominated by either the magnetic field or heat diffusion, depending on the temperature and the material properties of the conductor. In general, heat diffuses much more rapidly in high electrical conductivity materials of cryogenic temperatures. The magnetic field takes longer to diffuse, since screening currents can be rapidly set up which shield the interior of the material from further magnetic field penetration. Conversely, in high resistivity materials, the magnetic field diffuses much more rapidly. A coupled two-dimensional thermal/magnetic model has been developed. The results of this model, showing the time and spatial variation of the magnetic field and temperature, are discussed for the projectile of an electromagnetic launcher.
Authors:
; ; ;  [1]
  1. (General Dynamics Corp., San Diego, CA (USA). Space Systems Div.)
Publication Date:
OSTI Identifier:
5272380
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE (Institute of Electrical and Electronics Engineers) Transactions on Magnetics; (USA); Journal Volume: 25:4
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; MAGNETIC ENERGY STORAGE; TRANSFORMERS; MAGNETS; ELECTRIC CONDUCTIVITY; CRYOGENICS; ELECTRIC CONDUCTORS; HEAT TRANSFER; LAUNCHING; MAGNETIC FIELDS; MAGNETIC SHIELDING; PROJECTILES; ELECTRICAL EQUIPMENT; ELECTRICAL PROPERTIES; ENERGY STORAGE; ENERGY TRANSFER; EQUIPMENT; PHYSICAL PROPERTIES; SHIELDING; STORAGE 250100* -- Energy Storage-- Magnetic