Compressed powder magnetic core and method for fabricating same
First Claim
1. A compressed powder magnetic core for an inner yoke of a linear voice coil motor, said core being a compressed body of a ferromagnetic powder and a hardenable binder resin wherein the sum of the body volume percentage of binder resin in said body and the body volume percentage of voids in said body after compression and hardening and before addition of any void-filling material is greater than about 7 per cent and smaller than about 50 per cent and the body volume percentage of voids in said body after compression and hardening and before addition of any void-filling material is greater than about 5 per cent and less than about 30 per cent and wherein said voids are filled with a hardened filler resin.
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Abstract
A compressed powder magnetic corer is disclosed in which the mixing ratio (vol %) of the parts occupied by binder resin, ferromagnetic powder and void formed therebetween is set for a specified value so as to obtain desired magnetic characteristics.
52 Citations
7 Claims
- 1. A compressed powder magnetic core for an inner yoke of a linear voice coil motor, said core being a compressed body of a ferromagnetic powder and a hardenable binder resin wherein the sum of the body volume percentage of binder resin in said body and the body volume percentage of voids in said body after compression and hardening and before addition of any void-filling material is greater than about 7 per cent and smaller than about 50 per cent and the body volume percentage of voids in said body after compression and hardening and before addition of any void-filling material is greater than about 5 per cent and less than about 30 per cent and wherein said voids are filled with a hardened filler resin.
Specification