Patent ID: 7286034

Claim:
A method of making a permanent magnet in which the magnetization direction varies with location to optimize a desired magnetic field property at a selected point in a selected direction, the method comprising: determining the desired shape; assembling a plurality of permanent magnet segments into a share substantially conforming to the desired shape, the magnetization direction of each permanent magnet segment varying in two dimensions so that the magnetization direction of each permanent magnet segment is in the direction that substantially optimizes the desired magnetic field property at the selected point in the selected direction, wherein the direction of magnetization throughout each permanent magnet segment is constant, and wherein the desired property is transverse magnetic field, and the relationship between the magnetization angle and the angular position is given by b = { b x b y } = μ 0 ⁢ m 8 ⁢ ⁢ π ⁢ ⁢ r 3 ⁢ { A ⁢ ⁢ cos ⁢ ⁢ α + B ⁢ ⁢ sin ⁢ ⁢ α B ⁢ ⁢ cos ⁢ ⁢ α + ( 2 - A ) ⁢ s ⁢ ⁢ sin ⁢ ⁢ α } where A=1+3 cos 2θ, B=3 sin 2θ, θ represents position angle, and α represents magnetization angle.