DIFFUSION OF A MAGNETIC FIELD INTO A MOVING CONDUCTOR
Abstract
A study is made of the diffusion of a magnetic field into a copper slug as it traverses the air gap of a magnet. The results are discussed in terms of the magnetic Reynolds number of the system, a dimensionless parameter proportional to the ratio of a characteristic diffusion time and the transit time through the field region. With the use of an approximate, single decay model of the diffusion process, the variation of magnetic flux is predicted and compared with the experimentally obtained response of search coils situated in the air gap. The peak flux change may be expressed in a non-dimensional form where the appropriate magnetic Reynolds number is proportional to, but considerably smaller than, the usual definition involving a critical conductor dimension as the characteristic length. A short discussion is included on the possibility of utilizing this effect in an energy conversion device. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 03, 1960
- Accession Number
- AD0258204
Entities
People
- John K. Oddson
Organizations
- Massachusetts Institute of Technology