Rare-earth containing iron-base resin bonded magnets

Details Rare-earth containing iron-base resin bonded magnets Rare-earth containing iron-base resin bonded magnets

1995-02-10

1998-01-06

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

335306, H01F 300

Patent

active

057059705

ABSTRACT:
A motor having rotor has a good balance of inertia and a magnetic characteristic that match the specifications of the motor with which those rotors are to be used. A rare-earth containing iron-base resin-bonded magnet is molded from an iron-base magnetic powder containing a rare earth metal such as neodymium and praseodymium in powder, a thermoplastic or thermosetting resin and additive. A density and magnetic characteristic is proportionally changed by adjusting a mixing ratio of a filler powder. Specifically, when a mixing ratio of filler powder containing tungsten having a density 19.1 g/cm.sup.3 is in 13 vol % is injected, or a mixing ratio of alloy powder containing tungsten an nickel, or tungsten and chromium having a density 10.5 g/cm.sup.3 is compression-mold, its magnetic flux assume the same value as those of compression-molded Sm--Co magnets.

REFERENCES:
patent: 5009706 (1991-04-01), Sakamoto et al.
patent: 5389176 (1995-02-01), Nakanishi et al.
patent: 5414396 (1995-05-01), Bagalini

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