Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1977-06-24
1980-04-15
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Linear
318135, H02K 4100
Patent
active
041985826
ABSTRACT:
A high performance stepper motor comprises a stator having a plurality of pole positions. Each of the pole positions includes a plurality of stator elements or teeth on opposite sides of a stator-to-stator air gap with nonmagnetic material located in the spaces between the extremities of the teeth. Energization means in the form of a plurality of windings adapted to be connected to a multiphased drive source are associated with the stator means at the various pole positions respectively. Motive means comprising a rotor or a slider includes a plurality of motive elements which comprise teeth or slugs. In order to further achieve low inertia and a high force-to-mass ratio of the passive means, the motive means comprises discontinuities in the magnetic material thereof including nonmagnetic material between the extremities of the motive elements so as to reduce flux leakage in the direction of movement of the passive means through the air gap while simultaneously reducing the mass of the motive means.
REFERENCES:
patent: 2627040 (1953-01-01), Hansen
patent: 3042818 (1962-07-01), Busch
patent: 3320450 (1967-05-01), Bosco, Jr. et al.
patent: 3329843 (1967-07-01), Anderson
patent: 3566224 (1971-02-01), Vallauri et al.
patent: 3761755 (1973-09-01), Inaba et al.
patent: 3904897 (1978-09-01), Shichida et al.
Matthias Dan W.
Thornton Richard D.
Duggan Donovan F.
Exxon Research & Engineering Co.
Norris Norman L.
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