US4051401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic loops closure elements for electric motor
Assignee: Individual
•
Filing: 1976-06-01
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Granted: 1977-09-27
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Expires: 1996-06-01
Abstract
Abstract A spherical air gap motor wherein the magnetic ring closing the stator magnetic loop has a non-cylindrical shape.
Inventors
- 👤 William George Hayward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:55
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K5/00; H02K5/04; H02K5/12; H02K5/128; H02K5/1282
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
127 words
An electric motor including a stator having a plurality of radially extending magnetically soft iron elements forming pole teeth having portions of greater and lesser diameters, a rotor at one axial end of said pole teeth adapted to conduct magnetic flux between said pole teeth, and a magnetic closure loop element at the opposite axial end of said pole teeth than said rotor having portions thereof which are associated with portions of said pole teeth; the improvement comprising in that the cross-sectional areas of a portion of said closure loop element associated with a portion of said pole teeth of greater diameter is greater than the cross-sectional area of a portion of said closure loop element associated with a portion of said pole teeth of lesser diameter.
Claim 2
Dependent Claim
127 words
An electric motor including a stator having a plurality of radially extending magnetically soft iron elements forming pole teeth having portions of greater and lesser diameters, a rotor at one axial end of said pole teeth adapted to conduct magnetic flux between said pole teeth, and a magnetic closure loop element at the opposite axial end of said pole teeth than said rotor having portions thereof which are associated with portions of said pole teeth; the improvement comprising in that the cross-sectional areas of a portion of said closure loop element associated with a portion of said pole teeth of greater diameter is greater than the cross-sectional area of a portion of said closure loop element associated with a portion of said pole teeth of lesser diameter.
Claim 3
Dependent Claim
17 words
An electric motor according to claim 1 wherein the magnetic loop closure element comprises sheet metal material.
Claim 4
Dependent Claim
18 words
An electric motor according to claim 2 wherein the magnetic loop closure element comprises nested sheet metal rings.
Claim 5
Dependent Claim
17 words
An electric motor according to claim 2 wherein said magnetic loop closure element comprises spirally wound strips.
References Cited (Backward Citations)
US3814963A
Cited
DE2358025A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |