Inductor devices – With electric and/or magnetic shielding means
Patent
1998-12-01
2000-02-01
Geller, M. C.
Inductor devices
With electric and/or magnetic shielding means
335231, 335306, 210222, H01F 2730, H01F 700, B01D 3506
Patent
active
060208058
ABSTRACT:
A permanent magnet assembly comprising an essentially tubular magnet element which is radially magnetized, inner and outer members of a magnetic material resting against inner and outer sides, respectively, of the magnet element, and an annular top plate placed on one end of the outer member. The annular top plate and an end portion of the inner member form an annular air gap which is axially separated from the magnet element and across which the magnetic flux of the magnet element extends radially. The inner member has a polygonal outer surface. The magnet element is divided axially into a number of separate magnet segments having inner surfaces fixed to corresponding outer surfaces of the inner member. Also, the outer member is divided axially into a number of yokes corresponding to and fixed to the outer surfaces of respective magnet segments and to the adjacent underside of the top plate, so that the cavity present between the air gap and the top plate and the adjacent ends of the magnet segments communicates with outwardly open ventilating passages defined by mutually adjacent pairs of magnet segments and yokes. In this manner, the cavity is effectively ventilated towards the surroundings.
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patent: 5434458 (1995-07-01), Stuart et al.
patent: 5661446 (1997-08-01), Anderson et al.
patent: 5786741 (1998-07-01), Leibzon
Geller M. C.
Mai Anh
Seas Fabrikker As
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