Patent US4179634A successfully refreshed from Google Patents.
US4179634A
Expired / Lapsed
US
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Magneto rotor construction
Assignee: RE Phelon Co Inc
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Filing: 1978-06-02
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Granted: 1979-12-18
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Expires: 1998-06-02
Abstract
Abstract Rotor for a magnetomotive device in the form of an annular casting having a cavity or slot formed in the periphery thereof. The cavity includes locating surfaces. A permanent magnet is held in clamping relation within said cavity between a pair of pole pieces which include arcuate pole faces coaxial with the rotor. Retaining pins disposed in registered recesses of the cavity and pole pieces hold said pole pieces in said slot and urge surface portions thereof radially against said locating surfaces which are oriented to cause the pole pieces to exert clamping forces against the magnet disposed therebetween with the pole faces disposed in coaxial relation in the rotor.
Inventors
- 👤 Bob O. Burson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:44
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/2726; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
122 words
Rotor for a magnetomotive device comprising an annular rotatable body having a cavity defined by nonmagnetic material in the rim thereof including locating surfaces, a permanent magnet and circumferentially spaced pole shoes disposed in said cavity, said pole shoes being disposed in clamping relation with said magnet and each pole shoe having an arcuate surface and other portions engaged with said magnet and said locating surfaces, and means for retaining said pole shoes in said clamping relation with said permanent magnet within said cavity and for urging said pole shoes radially against said locating surfaces which are oriented to cause said pole shoes to exert clamping forces against said magnet while said arcuate surfaces are held in coaxial relation in said rotor.
Claim 2
Dependent Claim
122 words
Rotor for a magnetomotive device comprising an annular rotatable body having a cavity defined by nonmagnetic material in the rim thereof including locating surfaces, a permanent magnet and circumferentially spaced pole shoes disposed in said cavity, said pole shoes being disposed in clamping relation with said magnet and each pole shoe having an arcuate surface and other portions engaged with said magnet and said locating surfaces, and means for retaining said pole shoes in said clamping relation with said permanent magnet within said cavity and for urging said pole shoes radially against said locating surfaces which are oriented to cause said pole shoes to exert clamping forces against said magnet while said arcuate surfaces are held in coaxial relation in said rotor.
Claim 3
Dependent Claim
34 words
Rotor for magnetomotive devices as set forth in claim 1 in which said retaining means comprises stressed members disposed in axially extending apertures formed between wall portions of said cavity and said pole shoes.
Claim 4
Dependent Claim
51 words
Rotor for magnetomotive devices as set forth in claim 1 in which said rotor is a casting of ferrous metal with a peripheral recess, a nonferrous insert carried by said rotor within said recess, said insert being provided with said cavity adapted to receive said permanent magnet and pole shoes therein.
Claim 5
Dependent Claim
53 words
Rotor for magnetomotive devices as set forth in claim 1 in which each of said locating surfaces is located on opposite sides of the centerline of said cavity and disposed at an oblique angle thereto whereby the pole shoes engaged with said locating surfaces are urged by said retaining means toward said centerline.
Claim 6
Dependent Claim
21 words
Rotor for a magnetomotive device as set forth in claim 2 in which said retaining members comprise spring steel tubular pins.
Claim 7
Dependent Claim
93 words
Rotor for a magnetomotive device as set forth in claim 5 in which said annular rotatable body is an integral casting and in which each of said pole shoe members are powder metal castings, each of said pole shoes including a cylindrical surface and an inclined surface disposed in engagement with one of said locating surfaces, said pole shoes also including circumferentially extending shoulder portions which engage the upper outer edge portions of said magnet for positive retention thereof against outward displacement resulting from the centrifugal force caused by rotation of said rotor.
Claim 8
Dependent Claim
63 words
Rotor for a magnetomotive device as set forth in claim 6 in which said rotor casting includes a second cavity disposed diametrically opposite the first cavity and a counterweight disposed in said second cavity for balancing the weight of said pole shoes and permanent magnet, said first cavity and second cavity having a common plane of symmetry containing a diameter of said rotor.
References Cited (Backward Citations)
US1095118A
Cited
US2516901A
Cited
US2652504A
Cited
US2907903A
Cited
US2866912A
Cited
US3072813A
Cited
US2945138A
Cited
US3265913A
Cited
US3581394A
Cited
US3657582A
Cited
US3663850A
Cited
US3828212A
Cited
US3979617A
Cited
US4012651A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-17 | 1983-06-18 | 1983-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-17 | 1987-06-18 | 1987-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-17 | 1991-06-18 | 1991-12-18 | $7700.00 | Window Closed / Lapsed |