Patent US3845338A successfully refreshed from Google Patents.
US3845338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current shell armature motor
Assignee: Transicoil Inc
•
Filing: 1974-02-20
•
Granted: 1974-10-29
•
Expires: 1994-02-20
Abstract
Abstract An efficient direct current motor using a shell armature with toroidally wound coils thereon. The armature coils interact with two independent magnetic circuits. One magnetic circuit includes an inner magnet enclosed by the armature shell and radially magnetized. An inner magnetic core is disposed within the inner magnet and in direct contact therewith to form a return path. The second circuit includes an outer magnet radially magnetized oppositely to said radially magnetized inner magnet and enclosing said shell armature. An outer magnetic yoke is disposed outside and in direct contact with the outer magnet to form a return path therefor. The shell armature is disposed between the inner and outer magnet and adapted to rotate in response to interaction between the fields created by the two magnetic circuits and current in the armature windings.
Inventors
- 👤 M Fawzy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:32
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/02; H02K23/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
158 words
Apparatus for direct current dynamoelectric use, comprising: a rotatable shaft; a permeable magnetic armature shell co-axial with and secured to said shaft, said armature shell being provided with coils toroidally wound thereon; an inner magnet radially magnetized disposed co-axial with said shaft between said shaft and said armature shell; a magnetic inner core comprising permeable magnetic material disposed to function as a magnetic return path for said inner magnet; said inner magnet, armature shell and inner core comprising a first magnetic circuit; an outer magnet disposed outside and co-axial with said armature shell, said outer magnet being radially magnetized oppositely to said radially magnetized inner magnet; a magnetic yoke comprising permeable magnetic material disposed to function as a magnetic return path for said outer magnet; said outer magnet, armature shell and yoke comprising a second magnetic circuit; and, commutator means, said commutator means being adapted to supply to or receive from said armature shell coils a direct current.
Claim 2
Dependent Claim
158 words
Apparatus for direct current dynamoelectric use, comprising: a rotatable shaft; a permeable magnetic armature shell co-axial with and secured to said shaft, said armature shell being provided with coils toroidally wound thereon; an inner magnet radially magnetized disposed co-axial with said shaft between said shaft and said armature shell; a magnetic inner core comprising permeable magnetic material disposed to function as a magnetic return path for said inner magnet; said inner magnet, armature shell and inner core comprising a first magnetic circuit; an outer magnet disposed outside and co-axial with said armature shell, said outer magnet being radially magnetized oppositely to said radially magnetized inner magnet; a magnetic yoke comprising permeable magnetic material disposed to function as a magnetic return path for said outer magnet; said outer magnet, armature shell and yoke comprising a second magnetic circuit; and, commutator means, said commutator means being adapted to supply to or receive from said armature shell coils a direct current.
Claim 3
Dependent Claim
29 words
Apparatus in accordance with claim 1 wherein said magnetic inner core is disposed intermediately between said shaft and said inner magnet and in direct contact with said inner magnet.
Claim 4
Dependent Claim
27 words
Apparatus in accordance with claim 1 wherein said magnetic yoke is disposed outside and co-axial with said outer magnet and in direct contact with said outer magnet.
Claim 5
Dependent Claim
12 words
Apparatus in accordance with claim 1 wherein said armature shell is laminated.
Claim 6
Dependent Claim
12 words
Apparatus in accordance with claim 1 wherein said armature shell is drawn.
References Cited (Backward Citations)
DE1039127B
Cited
US3001093A
Cited
US3237036A
Cited
US3335309A
Cited
US3440464A
Cited
US3426224A
Cited
US3462626A
Cited
US3555330A
Cited
US3602749A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |