Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1977-01-14
1978-09-26
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 82, 310 83, H02K 3700
Patent
active
041173562
ABSTRACT:
Speed capability of a rotary stepping motor of the harmonic drive type is markedly increased by providing a stiffer, i.e. harder to radially deflect, structure of its rotor. Elimination of magnetically permeable bridging material as heretofore employed is made possible also in an alternate construction. Basically, thickness of a flexrotor or flexspline wall is made greater than hitherto relative to its outside diameter to provide a stiffness insuring efficient operation at increased natural or resonant frequency. Higher capability of the thicker-stiffer flexspline to maintain its sinusoidal shape during operation results in less tooth wear and increased efficiency over a longer operating life. When concentric ring bridging is incorporated, its total wall-to-outside-diameter ratio thickness is advantageously substantially that of the novel flexrotor or flexspline itself to obtain higher step rates efficiently.
REFERENCES:
patent: 3496395 (1970-02-01), Newell
patent: 3609423 (1971-09-01), Spring et al.
patent: 3894255 (1975-07-01), Newton, Jr.
Mansfield Donald Longworth
Woodward Walter Ray
Duggan Donovan F.
Johnson Carl E.
Megley Richard B.
USM Corporation
White Vincent A.
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