Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1989-11-02
1991-03-05
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
335306, 29607, H01F 702
Patent
active
049980831
ABSTRACT:
The construction of a yokeless permanent magnet structure with a cavity, which structure comprises a single layer of abutted magnetic prisms, is performed by first utilizing a reference point "F" for the construction such that point F lies on a equipotential line of zero potential. The point F must, furthermore, be selected so that it lies on a line which divides the magnetic flux within the cavity into two separate loops or parts. Beginning from point F, the magnet structure is then constructed from a series of precisely abutted prisms of magnetic material which form a cavity with a predetermined, uniform polygonal cross section. Using well known boundary value conditions between the cavity and the various prisms of the magnetic material, as well as the restriction that the exterior surface of the permanent magnetic must be an equipotential surface of zero potential, each prism, in turn, is constructed, until the entire permanent magnet is completed. It has been found that the amount of magnetic material utilized in the entire permanent magnet structure obtained in this manner is uniquely related to the value K and the location of point F. It is therefore possible to quantify the relationship between the amount of magnetic material in the structure with respect to K and F, whereby a structure with the minimum amount of magnetic material may be obtained.
REFERENCES:
patent: 3205415 (1965-09-01), Seki et al.
patent: 3768054 (1973-10-01), Neugebauer
patent: 4647887 (1987-03-01), Leupold
Harris George
New York University
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