Patent ID: 6525633
Filing Date: 2003-02-25
Classification: H01F,Y10T

Abstract:
A device for magnetizing an unmagnetized toroidal ring, comprising:a hollow cylindrical flux source having a cavity, said flux source generating a radial working field having a given direction; a notched filler in said cavity of the hollow cylindrical flux source, said notched filler further comprising a plurality of interlocking teeth and notches equally spaced periodically along an azimuthal axis of said unmagnetized toroid; said notched filler being operable to impose a circumferentially periodic magnetization on said radial working field generated in the cavity of the hollow cylindrical flux source; said hollow cylindrical flux source being separable along its equatorial axis such that said unmagnetized toroidal ring can be placed in the hollow cavity of the magnetized toroidal shell; said circumferentially periodic magnetization of the radial working field in the cavity of the hollow cylindrical flux source includes: a region in which the working field is strong enough to magnetize part of the magnetized toroidal ring; and a region in which the working field is not strong enough to magnetize the unmagnetized toroidal ring; and causing said unmagnetized toroidal ring to have a magnetization that alternates direction at a plurality of points along said azimuthal axis.