| 摘要 |
PURPOSE:To reduce an eddy current loss in a permanent magnet part by a method wherein a permanent magnet for a magnetic bias of an inductance element is composed of magnetic powder bound with a resin and an electrical resistance of the permanent magnet is increased. CONSTITUTION:A material composition of a permanent magnet for a magnetic bias of an inductance element is expressed as R(Co1-x-y-zFexCuyMz)A wherein R means one or more types of combinations of rare earth metals whose main elements are Sm and Ce and M means one or more types of combinations of Si, Ti, Zr, Hf, Ne, Ta and V and (x), (y), (z) and A are in the ranges of 0.001<=x<= 0.40, 0.02<=y<=0.25, 0.001<=z<=0.15 and 5.5<=A<=8.5. A cast ingot of the magnetic material of this composition is subjected to a heat-treatment and pulverization and is bound with 1-7wt% of a resin. A diameter of pulverized particles is 45- 300mum and epoxy resin and polyphenylene sulfide resin are used as the resin for dipping and for injection molding respectively. |
