US4434389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor with redundant windings
Assignee: KOLLMORGAN TECHNOLOGIES Corp C/O CTC CORP REPUBLIC NATIONAL BANK BUILDING A CORP OF TX
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Filing: 1980-10-28
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Granted: 1984-02-28
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Expires: 2000-10-28
Abstract
Abstract An electric motor is wound with redundant sets of windings which are energized by independent electric circuits to enable operation of the motor even in the presence of a failure of a winding and a failure of an energization circuit. The motor may be of the permanent magnet form with electronic switching of the winding currents in lieu of switching via a commutator, known as a brushless DC motor, in which case separate sensing devices, such as Hall effect devices, are employed with each winding set and energization circuit for sensing the relative position between the moving and stationary members of the motor. The sets of windings, when placed on the stator, are physically spaced apart so as to minimize magnetic coupling therebetween.
Inventors
- 👤 Lawrence W. Langley
- 👤 Roger B. Bross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:37
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/28; H02K11/00; H02K11/30; H02K11/33; H02K16/00; H02K16/04; H02K29/00; H02K29/06; H02K29/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
A DC electric servomotor comprising: a pair of relatively movable members, one being the stator and the other being the rotor of said electric servomotor; said stator including at least two sets of distributed, non-overlapping redundant windings spaced apart for minimal magnetic coupling therebetween, each of said windings being independently excitable to produce a reversible magnetic field for rotating said rotor in either direction; said redundant winding being mounted on said stator such that torque summing is achieved from the torques generated by the individual ones of said redundant windings; and a separate commutation circuit for each set of redundant windings, said commutation circuits each being connected to a different one of said sets of redundant windings to produce the moving magnetic field from a DC power source for causing rotation of said rotor.
Claim 2
Dependent Claim
134 words
A DC electric servomotor comprising: a pair of relatively movable members, one being the stator and the other being the rotor of said electric servomotor; said stator including at least two sets of distributed, non-overlapping redundant windings spaced apart for minimal magnetic coupling therebetween, each of said windings being independently excitable to produce a reversible magnetic field for rotating said rotor in either direction; said redundant winding being mounted on said stator such that torque summing is achieved from the torques generated by the individual ones of said redundant windings; and a separate commutation circuit for each set of redundant windings, said commutation circuits each being connected to a different one of said sets of redundant windings to produce the moving magnetic field from a DC power source for causing rotation of said rotor.
Claim 3
Dependent Claim
27 words
A servomotor according to claim 1 wherein said rotor includes permanent magnets for producing a field cooperating with said moving magnetic field for causing synchronous motor rotation.
Claim 4
Dependent Claim
47 words
A servomotor according to claim 1 wherein said commutation circuits each include a position sensor to indicate the relative position between said rotor and said stator and solid state switching circuits for controlling energization of the associated set of redundant windings in accordance with the rotor position.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |