Method of producing a cylindrical permanent magnet

Details Method of producing a cylindrical permanent magnet Method of producing a cylindrical permanent magnet

1984-05-15

1986-07-15

Lieberman, Allan M.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making composite or hollow article

419 26, 419 38, 419 44, 335302, B22F 316, B22F 324

Patent

active

046005552

ABSTRACT:
A method of producing a cylindrical permanent magnet having a multipole surface anisotropy. The method comprises the steps of: preparing a metal mold cooperating with a lower punch in defining therein a cylindrical compacting cavity, the metal mold being provided in the inner peripheral surface thereof with field coils corresponding in number to the number of the magnetic poles of the magnet to be produced; charging the compacting cavity with a ferromagnetic powder having a magnetic anisotropy; energizing the field coils to impart a magnetic anisotropy to the ferromagnetic powder while compacting the powder between an upper punch and the lower punch to form a compact; demagnetizing the formed compact followed by a firing; and magnetizing the fired compact in the same direction as the anisotropy. The method is characterized in that the field coils produce pulse magnetic field the intensity of which is not smaller than 3.5.times.10.sup.3 ampere-turn/m when measured at the outer peripheral surface of the compacting cavity, thereby attaining a multipole surface anisotropy on the compact.

REFERENCES:
patent: 3114715 (1963-12-01), Brockman
patent: 4057606 (1977-11-01), Kobayashi et al.

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