Patent ID: 6982620

Claim:
A magnet structure, comprising: a first permanent magnet mass; a first pole, having a first pole face and disposed on the first permanent magnet mass; a second permanent magnet mass; a second pole, having a second pole face and disposed on the second permanent magnet mass; and a frame connecting the first permanent magnet mass to the second permanent magnet mass, such that the first pole face is substantially opposite and facing the second pole face to define a magnetic field volume in a gap located between the first pole face and the second pole face; wherein the first and second permanent magnetic masses include discrete magnetic elements; wherein the discrete magnetic elements are respective first and second pluralities of bricks made of magnetic material; wherein each said first and second pluralities of bricks includes main bricks oriented so as to direct a main magnetic field in a first direction, and bucking bricks oriented to direct a blocking magnetic field in a second direction.