Metal working – Method of mechanical manufacture – Electrical device making
Patent
1997-06-03
1998-10-20
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
29605, H02K 1504
Patent
active
058228390
ABSTRACT:
A method of making a micromotor in a ceramic, includes forming a sacrificial stator member, a sacrificial stator core with a plurality of teeth each having a central portion and a free-end and providing a tape cast ceramic material wrapped around the central portion of each tooth, and a sacrificial fiber wound in a helical fashion on the tape cast material; forming a micromolded ceramic bottom portion in the green state having a cavity for receiving the sacrificial stator member and an insert recess, and inserting the sacrificial stator member into the cavity. The method further includes forming a micromolded ceramic top portion in the green state; assembling the micromolded ceramic top portion in a relationship to the micromolded ceramic bottom portion so that the ends of the sacrificial fibers extend through the plurality of second pairs of through holes, the first pair of through holes being aligned over a sacrificial stator core and the recess through hole and the insert recess being aligned to form a rotor mechanism receiving recess; sintering the assembled micromolded ceramic top and bottom portions to form a unitary ceramic body; after etching filling the embedded coil receiving cavities with a conductive material and filling the ferromagnetic stator receiving cavity with soft magnetic material; and mounting a rotor drive mechanism in the rotor mechanism receiving recess and in operative relationship to the ferromagnetic stator and having a rotor member arranged so that when drive voltages are applied to the embedded conductive coil structures a field is created through the ferromagnetic stator.
REFERENCES:
Deng et al, "A Simple Fabrication Process for Side-Drive Micromotors," 7.sup.th International Conference on Solid-State Sensors and Actuators, Digest of Technical Papers, Jun. 1993, pp. 756-759.
Chatterjee Dilip K.
Furlani Edward P.
Ghosh Syamal K.
Eastman Kodak Company
Hall Carl E.
Owens Raymond L.
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