Patent US3603826A successfully refreshed from Google Patents.
US3603826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor-stator assembly having reduced inertia
Assignee: IMC Magnetics Corp
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Filing: 1969-10-31
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Granted: 1971-09-07
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Expires: 1989-10-31
Abstract
Abstract A stator rotor and permanent magnet assembly constituting a stepper motor or induction-type generator having reduced inertia. A nonrotating permanent magnet is provided. A rotor is configured to have a part rotating in a gap between the stator poles and the permanent magnet. The permanent magnet is mounted at one end from the housing so that the magnetic field is through the stator poles axially of the permanent magnet and through a part of the housing.
Inventors
- 👤 Simon Saretzky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:24
CPC Classifications
H; H02; H02K; H02K37/00; H02K37/10; H02K37/20; H02K21/00; H02K21/38; H02K21/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
126 words
A rotor and stator assembly comprising a laminated stator core assembly having poles with windings thereon, a shaft having an open-ended cylindrical rotor thereon, a cylindrical nonrotatable permanent magnet fixedly mounted at one end thereof relative to said stator core, housing means supporting said magnet and said stator core and having a portion abutting said one end of said magnet and defining a continuous flux path from said one end to said stator core, said magnet being axially magnetized, said rotor having a part positioned to rotate adjacent the other end surface of said magnet and a cylindrical part between the surfaces of the stator poles and the permanent magnet in an air gap directly between said stator assembly and the sides of said permanent magnet.
Claim 2
Dependent Claim
126 words
A rotor and stator assembly comprising a laminated stator core assembly having poles with windings thereon, a shaft having an open-ended cylindrical rotor thereon, a cylindrical nonrotatable permanent magnet fixedly mounted at one end thereof relative to said stator core, housing means supporting said magnet and said stator core and having a portion abutting said one end of said magnet and defining a continuous flux path from said one end to said stator core, said magnet being axially magnetized, said rotor having a part positioned to rotate adjacent the other end surface of said magnet and a cylindrical part between the surfaces of the stator poles and the permanent magnet in an air gap directly between said stator assembly and the sides of said permanent magnet.
Claim 3
Dependent Claim
30 words
A structure as in claim 1 wherein said rotor has a part having an axial dimension approximately the same as the axial dimension of the faces of the stator poles.
Claim 4
Dependent Claim
27 words
A structure as in claim 1 wherein the cylindrical part of said rotor is a skirt concentrically positioned between the stator pole faces and the permanent magnet.
Claim 5
Dependent Claim
36 words
A structure as in claim 1 wherein the said permanent magnet is displaced axially from the stator poles, the rotor having a part having substantially the same axial dimension as the faces of the stator poles.
Claim 6
Dependent Claim
28 words
A structure as in claim 1 wherein said pole faces have teeth formed therein and said rotor has peripheral teeth rotatable adjacent the teeth on the pole faces.
Claim 7
Dependent Claim
22 words
A structure as in claim 1 wherein said permanent magnet has a soft iron member at one end forming a radial airgap.
Claim 8
Dependent Claim
22 words
A structure as in claim 1 wherein the said shaft is cantilever mounted in bearing means at one end of the housing.
Claim 9
Dependent Claim
22 words
A structure as in claim 7 wherein said permanent magnet has a soft iron member at one end forming a radial airgap.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |