Patent US2178912A successfully refreshed from Google Patents.
Patent US3696260A successfully refreshed from Google Patents.
US3696260A
Expired / Lapsed
US
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Permanent magnet rotor structure
Assignee: Prestolite Electric Inc
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Filing: 1971-08-02
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Granted: 1972-10-03
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Expires: 1991-08-02
Abstract
Abstract A rotor structure for a permanent magnet alternator includes a plurality of alternate laminations of circular ceramic magnets polarized through the thickness thereof and thin circular sheets of iron. The polarity of the magnets is reversed in alternate layers. The iron sheets each include a plurality of tabs extending radially outwardly therefrom and which are bent over an adjacent magnet. Alternate sheet metal layers are shifted about the axis of rotation of the structure so that the tabs of alternate sheets are out of alignment with respect to each other. The tabs effectively join the magnetic poles of adjacent magnets to provide a series of strip-like magnetic poles extending in a direction parallel to the axis of rotation of the rotor structure and spaced circumferentially thereabout.
Inventors
- 👤 Melvin A Lace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:09
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/2713
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
A rotor structure for a permanent magnet electrical generating machine, including in combination: a plurality of permanent magnet sections and a plurality of sheets of magnetizable material arranged in alternate layers with respect to each other, the axis of said rotor structure extending substantially perpendicular to said layers, and alternate ones of said permanent magnet sections being oppositely poled with respect to each other, each of said magnetizable sheets including a plurality of tabs extending outwardly therefrom, said tabs being bent axially over an adjacent permanent magnet section and in close proximity with an alternate magnetizable sheet to provide a magnetic flux path, said tabs on alternate magnetizable sheets being spaced from each other peripherally about the rotor structure to provide alternate north and south magnetic poles thereabout.
Claim 2
Dependent Claim
128 words
A rotor structure for a permanent magnet electrical generating machine, including in combination: a plurality of permanent magnet sections and a plurality of sheets of magnetizable material arranged in alternate layers with respect to each other, the axis of said rotor structure extending substantially perpendicular to said layers, and alternate ones of said permanent magnet sections being oppositely poled with respect to each other, each of said magnetizable sheets including a plurality of tabs extending outwardly therefrom, said tabs being bent axially over an adjacent permanent magnet section and in close proximity with an alternate magnetizable sheet to provide a magnetic flux path, said tabs on alternate magnetizable sheets being spaced from each other peripherally about the rotor structure to provide alternate north and south magnetic poles thereabout.
Claim 3
Dependent Claim
23 words
A rotor structure as claimed in claim 1 wherein each of said permanent magnet sections comprises magnetic material of the bonded ferrite type.
Claim 4
Dependent Claim
28 words
A rotor structure as claimed in claim 2 wherein said permanent magnet sections are polarized through the thickness thereof, the magnets being stacked axially throughout said rotor structure.
Claim 5
Dependent Claim
57 words
A rotor structure as claimed in claim 1 wherein said permanent magnet sections and sheets of magnetizable material are circular dimensionally having radii substantially equal in length and wherein said permanent magnet sections and sheets of magnetizable material include centrally located apertures aligned with respect to each other for receipt of a rotatably mounted non-magnetic shaft therethrough.
Claim 6
Dependent Claim
32 words
A rotor structure as claimed in claim 4 wherein said tabs on any one of said magnetizable sheets are spaced a predetermined number of degrees from each other about the circumference thereof.
References Cited (Backward Citations)
US3452228A
Cited
US3411027A
Cited
US3513341A
Cited
US3459980A
Cited
US3553511A
Cited
US3571637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |