Patent ID: 7248137

Claim:
A magnet structure, comprising: a frame, including first and second opposing frame ends and a plurality of spacers separating the first and second frame ends; a first permanent magnet assembly, attached to the first frame end, including a first magnet enclosure, a first permanent magnet insert, and a first pole, having a first pole face and disposed on an end of the first magnet enclosure; and a second permanent magnet assembly, attached to the second frame end, including a second magnet enclosure, a second permanent magnet insert, and a second pole, having a second pole face and disposed on an end of the second magnet enclosure; wherein each of the first and second magnet enclosures includes a retainer, and a support attaching the retainer to the respective frame end, such that the respective permanent magnet insert is held between a first side of the retainer and the respective frame end, and the respective pole is connected to a second side of the retainer.