US4948998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor
Assignee: TECSTAR ELECTRO SYSTEMS Inc (A DELAWARE CORPORATION)
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Filing: 1989-01-10
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Granted: 1990-08-14
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Expires: 2009-01-10
Abstract
Abstract The electric motor contemplated by this invention includes an armature having two opposed faces mounted on a shaft. The armature is mounted on the shaft intermediate of the ends of the shaft. A pair of commutators are mounted on the shaft adjacent to each of the opposed armature faces. Each of the commutators includes a plurality of commutator bars, each of which has its circumferential width offset relative to the circumferential width of the commutator bars on the other commutator. Alternately or in combinatrion, with the commutator bar offset the brushes in operative engagement with each of the commutators are arranged with their circumferential width offset, relative to the circumferential width of the brushes in operative engagement with the opposite commutator. The electric motor can also be provided with a redundancy capability by a circuit arrangement in which one of the commutators is held as a backup in the event of a failure of the windings of the other commutator.
Inventors
- 👤 Richard A. Fink
- 👤 Robert C. Ellis, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:10
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/26; H02K23/36
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
165 words
An electric motor comprising: (a) a motor shaft having opposed ends; (b) an armature having opposed faces mounted on said shaft intermediate said ends, wherein said armature includes four windings arranged in two sets of parallel pairs, said windings including a plurality of coils arranged in parallel pairs and each of said coils including a first end and a second end; and (c) a commutator mounted on said shaft adjacent each of said faces, each of said pair of windings being connected to one of said commutators, each of said commutators including a plurality of commutator bars, a first end of one coil in a parallel pair and a second end of the other coil in said parallel pair terminating at the same commutator bar, wherein each of said commutators are arranged on said shaft with a circumferential width of each commutator bar on one of said commutators offset relative to a circumferential width of each commutator bar on the other of said commutator bars.
Claim 2
Dependent Claim
165 words
An electric motor comprising: (a) a motor shaft having opposed ends; (b) an armature having opposed faces mounted on said shaft intermediate said ends, wherein said armature includes four windings arranged in two sets of parallel pairs, said windings including a plurality of coils arranged in parallel pairs and each of said coils including a first end and a second end; and (c) a commutator mounted on said shaft adjacent each of said faces, each of said pair of windings being connected to one of said commutators, each of said commutators including a plurality of commutator bars, a first end of one coil in a parallel pair and a second end of the other coil in said parallel pair terminating at the same commutator bar, wherein each of said commutators are arranged on said shaft with a circumferential width of each commutator bar on one of said commutators offset relative to a circumferential width of each commutator bar on the other of said commutator bars.
Claim 3
Dependent Claim
21 words
The electric motor of claim 1 wherein said relative offset is one-half said circumferential width of each of said commutator bars.
Claim 4
Dependent Claim
19 words
The electric motor of claim 1 further comprising: brush means held in operative engagement with each of said commutators.
Claim 5
Dependent Claim
20 words
The electric motor of claim 3 wherein said brush means include brushes held in biased contact with said commutator bars.
Claim 6
Dependent Claim
18 words
The electric motor of claim 4 wherein said brushes are arranged around a circumferential periphery of said commutator.
Claim 7
Dependent Claim
39 words
The electric motor of claim 5 wherein said brushes include a circumferential width and said circumferential width of the brushes on one of said commutators is offset relative to the circumferential width of said brushes on an opposed commutator.
Claim 8
Dependent Claim
20 words
The electric motor of claim 6 wherein said relative offset is one-half the circumferential width of each of said brushes.
Claim 9
Dependent Claim
19 words
The electric motor of claim 1 wherein said brush means are held in operative engagement with said commutator bars.
Claim 10
Dependent Claim
20 words
The electric motor of claim 8 wherein said brush means include brushes held in biased contact with said commutator bars.
Claim 11
Dependent Claim
18 words
The electric motor of claim 9 wherein said brushes are arranged around said circumferential periphery of said commutators.
Claim 12
Dependent Claim
37 words
The electric motor of claim 10 wherein said brushes include a circumferential width and said width of said brushes on one of said commutators is offset relative to said width of said brushes on an opposed commutator.
References Cited (Backward Citations)
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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) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |