US3790831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for damping oscillations in a stepping motor
Assignee: COMPUTER DEVICES
•
Filing: 1972-06-09
•
Granted: 1974-02-05
•
Expires: 1992-06-09
Abstract
Abstract A stepping motor damping unit in which the freely rotating flywheel is journaled on the shaft of a stepping motor. The flywheel is provided with a permanent magnet. A plate of magnetic material is secured to the shaft of the motor and the magnet of the flywheel attracts it to the plate. A disk of friction material is positioned between adjacent parallel surfaces of the flywheel and the plate to provide a non-magnetic gap and at the same time provide wear-resistant low friction surfaces allowing for relative rotation between the plate and the flywheel.
Inventors
- 👤 A Morreale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:33
CPC Classifications
H; H02; H02K; H02K37/00; H02K37/22
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
147 words
Apparatus for damping oscillations in the output shaft of a stepping motor, comprising: a first member journaled on the shaft of the stepping motor, the first member being freely movable relative to the shaft both angularly and axially; a second member secured to the shaft and rotatable therewith, the first and second members having opposing parallel surfaces and being made of magnetic material; a disk of wear resistant non-magnetic non-conductive material positioned between said surfaces for maintaining a high reluctance gap between the opposing surfaces of said members, the wear resistant material being in frictional contact with the two opposing surfaces; permanent magnet means mounted in said first member and producing flux across the gap between said opposing surfaces for urging the first member toward the second member, the wear resistance material being continuously squeezed between the opposing surfaces by the magnetic attraction between the two members.
Claim 2
Dependent Claim
147 words
Apparatus for damping oscillations in the output shaft of a stepping motor, comprising: a first member journaled on the shaft of the stepping motor, the first member being freely movable relative to the shaft both angularly and axially; a second member secured to the shaft and rotatable therewith, the first and second members having opposing parallel surfaces and being made of magnetic material; a disk of wear resistant non-magnetic non-conductive material positioned between said surfaces for maintaining a high reluctance gap between the opposing surfaces of said members, the wear resistant material being in frictional contact with the two opposing surfaces; permanent magnet means mounted in said first member and producing flux across the gap between said opposing surfaces for urging the first member toward the second member, the wear resistance material being continuously squeezed between the opposing surfaces by the magnetic attraction between the two members.
Claim 3
Dependent Claim
41 words
Apparatus of claim 1 wherein the permanent magnet is annular in shape and is polarized in a direction parallel to its axis of revolution, the permanent magnet being positioned with its axis of revolution coaxial with the shaft of the motor.
References Cited (Backward Citations)
US653424A
Cited
US2446290A
Cited
US2963599A
Cited
US2801352A
Cited
US3519859A
Cited
US3545301A
Cited
US3660703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |