Patent US3891876A successfully refreshed from Google Patents.
US3891876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnet electric motor having a non-ferrous solid armature
Assignee: Singer Co
•
Filing: 1974-08-02
•
Granted: 1975-06-24
•
Expires: 1994-08-02
Abstract
Abstract A structure for an electric motor is disclosed wherein a single solid non-magnetic armature having commutated windings thereon is mounted for rotation centrally of a single air gap formed between opposed pairs of permanent magnets having oppositely polarized and preferably flat poles facing said armature.
Inventors
- 👤 John A Herr
- 👤 Wolfgang Jaffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:58
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/58; H02K23/02; H02K23/04; H02K3/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
47 words
In an electric motor, a single solid non-magnetic cylindrical armature having commutated windings thereon, means for rotationally mounting said armature about the cylindrical axis thereof radially within a single air gap formed by peripheral permanent magnets having oppositely polarized pole faces facing the axis of said armature.
Claim 2
Dependent Claim
47 words
In an electric motor, a single solid non-magnetic cylindrical armature having commutated windings thereon, means for rotationally mounting said armature about the cylindrical axis thereof radially within a single air gap formed by peripheral permanent magnets having oppositely polarized pole faces facing the axis of said armature.
Claim 3
Dependent Claim
15 words
In an electric motor according to claim 1, wherein the pole face surfaces are convex.
Claim 4
Dependent Claim
17 words
In an electric motor according to claim 1, wherein the permanent magnets are formed from rare-earth alloys.
Claim 5
Dependent Claim
56 words
In an electric motor, a non-magnetic cylindrical armature having commutated windings thereon, and mounted on a non-magnetic stainless steel motor shaft for rotation about the cylindrical axis of said armature radially within a single air gap formed between peripheral spaced permanent magnetic influenced poles having alternately oppositely polarized pole faces facing the axis of said armature.
Claim 6
Dependent Claim
56 words
In an electric motor, a non-magnetic cylindrical armature having commutated windings thereon, and mounted on a non-magnetic stainless steel motor shaft for rotation about the cylindrical axis of said armature radially within a single air gap formed between peripheral spaced permanent magnetic influenced poles having alternately oppositely polarized pole faces facing the axis of said armature.
Claim 7
Dependent Claim
34 words
In an electric motor according to claim 4 in which said armature comprises a solid synthetic plastic body secured on said motor shaft and formed with lengthwise peripheral slots for accommodating said commutated windings.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |