H - Electricity – 02 – K
Patent
H - Electricity
02
K
310/57
H02K 37/00 (2006.01) H02K 41/06 (2006.01)
Patent
CA 1090404
Abstract of the Disclosure 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.
292915
Mansfield Donald L.
Woodward Walter R.
Corporation Usm
Swabey Ogilvy Renault
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