Processes and apparatuses for preparing permanent magnet stators

Details Processes and apparatuses for preparing permanent magnet stators Processes and apparatuses for preparing permanent magnet stators

1976-08-16

1981-02-10

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264108, 264311, 425 3, 425425, 425435, 425DIG33, H02K 1502, B29C 504

Patent

active

042501288

ABSTRACT:
Annular magnets, primarily for motor stators, are centrifugally cast from particulate materials and synthetic plastic materials. Iron particles and ferrite particles stratified during the spin casting procedures so that the former provide an outer stratum that serves as a yoke in the permanently magnetized structure. The anisotropic ferrite particles are magnetically oriented during casting by a rotating center magnet with the aid of bucking magnets that also rotate and serve to confine the field of the center magnet to the cavity area. Apparatus for carrying out the process is disclosed and includes means for introducing the plastic and particulate materials to the mold cavity while the mold is rotating as well as mold arrangements that facilitate material introduction by the creation of reduced pressure conditions in the cavity during the rotation of the mold. Permanent magnets or electromagnets may be used for ferrite particle orientation and compound magnets made from laminated and facially polarized rubber magnetic sections and which are arcuately bent are disclosed.

REFERENCES:
patent: 2849312 (1958-08-01), Peterman
patent: 3365351 (1968-01-01), Maaz et al.
patent: 3564705 (1971-02-01), Cochardt
patent: 3584105 (1971-06-01), Pekor
patent: 3692457 (1972-09-01), Pekor
patent: 3694115 (1972-09-01), Steingroever
patent: 3872334 (1975-03-01), Loubier
patent: 3989777 (1976-11-01), Strawson et al.
patent: 4000229 (1976-12-01), Wainer

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