A general method for flux confinement in permanent-magnet structures

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Abstract
This paper presents a general method for the design of permanent-magnet structures that provide uniform magnetic fields of up to several teslas in cavities of arbitrary shape. The mathematical criteria that govern confinement of flux within both yoked and yokeless magnetic structures are defined. The design procedure affords an exact determination of the distribution and magnetization of the magnetic material required for generation and confinement of the desired field within a cavity of given geometry. The method is applicable to magnets composed of ferrites and high-energy product materials for which the analysis can be based on a linear approximation to the demagnetization curve.

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