Patent US3708251A successfully refreshed from Google Patents.
US3708251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gearless drive method and means
Assignee: Boeing North American Inc
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Filing: 1970-05-11
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Granted: 1973-01-02
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Expires: 1990-05-11
Abstract
Abstract A synchronous motor has a circular rotating pair of cylindrical pole pieces of claw tooth form connected with propulsion means such as a propeller, and is driven by interaction of magnetic fields produced by segmented modular stator and field windings peripherally situated at spaced locations about the pole pieces energized by polyphase alternating current at a frequency determined by the speed of rotation of the pole pieces relative to the stationary stator and field coils. An additional DC signal is applied to the field windings. For higher power requirements, the number of segmented stator and field coil units can be increased.
Inventors
- 👤 J Pierro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:06
CPC Classifications
F; F04; F04D; F04D13/00; F04D13/02; F04D13/06; F04D13/0646; B; B63; B63H; B63H23/00; B63H23/22; B63H23/24; B63H5/00; B63H5/07; B63H5/125; B63H5/14; H; H02; H02K; H02K19/00; H02K19/02; H02K19/10; H02K19/103; H02K41/00; H02K41/02; H02K41/03; B63H2005/1254; B63H2005/1258; B63H2023/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
Gearless drive means comprising: a linear synchronous motor having a generally cylindrical interdigitated rotor, bearing support means for supporting said rotor rotationally about an axis, said motor further having stator means, said motor also having field pole means operatively associated with said stator means, mounting means for supporting said stator means and said field pole means stationary relatively to said rotor, and propulsion means secured to said rotor and rotatable therewith for propelling said motor along a path of travel, said propulsion means consisting of a marine propeller having a plurality of blades joined to said rotor at the tips thereof, said propeller being rotatable about the same rotation axis as said rotor.
Claim 2
Dependent Claim
113 words
Gearless drive means comprising: a linear synchronous motor having a generally cylindrical interdigitated rotor, bearing support means for supporting said rotor rotationally about an axis, said motor further having stator means, said motor also having field pole means operatively associated with said stator means, mounting means for supporting said stator means and said field pole means stationary relatively to said rotor, and propulsion means secured to said rotor and rotatable therewith for propelling said motor along a path of travel, said propulsion means consisting of a marine propeller having a plurality of blades joined to said rotor at the tips thereof, said propeller being rotatable about the same rotation axis as said rotor.
Claim 3
Dependent Claim
150 words
A propeller drive system for boats, consisting essentially of: a generally cylindrical water-impervious housing, means connecting said housing to a boat, a marine propeller axially centered within said housing, said propeller having a plurality of blades, an interdigitated metallic rotor secured to the outer tips of said blades, said rotor having a plurality of substantially parallel spaced apart elongate magnetic projections, segmented stator coil means mounted within said housing and operatively related with said rotor to produce a traveling magnetic wave in said rotor, segmented field coil means mounted within said housing and operatively related to produce a stationary magnetic wave in said rotor, bearing support means connected to said housing for supporting said propeller rotationally relative to said housing and with said rotor spaced-apart from and in close juxtaposition with said housing, and electrical power connection means for supplying said stator coil means with electrical current of predetermined frequency.
Claim 4
Dependent Claim
150 words
A propeller drive system for boats, consisting essentially of: a generally cylindrical water-impervious housing, means connecting said housing to a boat, a marine propeller axially centered within said housing, said propeller having a plurality of blades, an interdigitated metallic rotor secured to the outer tips of said blades, said rotor having a plurality of substantially parallel spaced apart elongate magnetic projections, segmented stator coil means mounted within said housing and operatively related with said rotor to produce a traveling magnetic wave in said rotor, segmented field coil means mounted within said housing and operatively related to produce a stationary magnetic wave in said rotor, bearing support means connected to said housing for supporting said propeller rotationally relative to said housing and with said rotor spaced-apart from and in close juxtaposition with said housing, and electrical power connection means for supplying said stator coil means with electrical current of predetermined frequency.
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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |