US3641376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single drag cup motor generator
Assignee: HAROWE SERVO CONTROLS Inc
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Filing: 1970-01-07
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Granted: 1972-02-08
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Expires: 1990-01-07
Abstract
Abstract In a miniature motor generator, a drag cup is the rotating electrically conducting element for both the motor and the generator. The drag cup rotates about an iron core. Stator windings are energized to drive the cup as a motor. A second stator winding generates a signal representing rotational speed. In order to prevent interaction and cross coupling between the motor and the generator, the motor stator is wound with a different number of poles than the generator stator.
Inventors
- 👤 Douglas J Livingston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:57
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/49; H; H02; H02K; H02K17/00; H02K17/42; H02K47/00; H02K47/18; H02K47/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
76 words
A motor generator comprising: a single rotating electrically conducting drag-cup-type element, ferrous core means disposed within said drag-cup-type element, first stator and windings disposed outside of said drag-cuptype element, said first stator and windings being electrically energized to drive said drag-cup-type element as a motor, and second stator and windings disposed outside of said drag-cuptype element, an electrical signal representing the rotational speed of said drag-cup-type element being induced in one of said second stator windings.
Claim 2
Dependent Claim
76 words
A motor generator comprising: a single rotating electrically conducting drag-cup-type element, ferrous core means disposed within said drag-cup-type element, first stator and windings disposed outside of said drag-cuptype element, said first stator and windings being electrically energized to drive said drag-cup-type element as a motor, and second stator and windings disposed outside of said drag-cuptype element, an electrical signal representing the rotational speed of said drag-cup-type element being induced in one of said second stator windings.
Claim 3
Dependent Claim
37 words
The motor generator recited in claim 1 wherein said first stator and windings are wound with a different number of poles than said second stator and windings to prevent cross coupling between the motor and the generator.
Claim 4
Dependent Claim
17 words
The motor generator recited in claim 1 wherein said ferrous core means is a single, one-piece, core.
Claim 5
Dependent Claim
97 words
A motor generator comprising: a single rotating electrically conducting cup-shaped element, ferrous core means disposed within said cup-shaped element, first stator and windings disposed outside of said cup-shaped element and electrically energized to rotate said cup-shaped element, and second stator and windings disposed outside of said cup-shaped element, an electrical signal representing the rotational speed of said cup-shaped element being induced in one of said second stator windings, said first stator and windings being wound with a different number of poles than said second stator and windings to prevent cross coupling between the motor and the generator.
Claim 6
Dependent Claim
97 words
A motor generator comprising: a single rotating electrically conducting cup-shaped element, ferrous core means disposed within said cup-shaped element, first stator and windings disposed outside of said cup-shaped element and electrically energized to rotate said cup-shaped element, and second stator and windings disposed outside of said cup-shaped element, an electrical signal representing the rotational speed of said cup-shaped element being induced in one of said second stator windings, said first stator and windings being wound with a different number of poles than said second stator and windings to prevent cross coupling between the motor and the generator.
Claim 7
Dependent Claim
17 words
The motor generator recited in claim 4 wherein said ferrous core means is a single, one-piece core.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |