WALTER R WOODWARD
Engineering in Carlisle, MA
License number
Massachusetts 17597
Issued Date
Nov 14, 1961
Expiration Date
Jun 30, 2002
Type
Mechanical Engineer
Address
Address
Carlisle, MA 01741
Personal information
See more information about WALTER R WOODWARD at radaris.comName
Address
Phone
537 William St #2, Fall River, MA 02721
772 New Boston Rd APT 2, Fall River, MA 02720
767 Bedford Rd, Carlisle, MA 01741
423 South St, Carlisle, MA 01741
14 Emmett St, Marlborough, MA 01752
Professional information
Rotor For Stepping Motor
US Patent:
4117356, Sep 26, 1978
Filed:
Jan 14, 1977
Appl. No.:
5/759257
Inventors:
Donald Longworth Mansfield - S. Hamilton MA
Walter Ray Woodward - Carlisle MA
Walter Ray Woodward - Carlisle MA
Assignee:
USM Corporation - Farmington CT
International Classification:
H02K 3700
US Classification:
310 49R
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.