Patent US4812696A successfully refreshed from Google Patents.
US4812696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor core with winding slots having reduced air gaps
Assignee: Individual
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Filing: 1987-02-17
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Granted: 1989-03-14
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Expires: 2007-02-17
Abstract
Abstract A magnet core for a rotor or stator of an electrical machine, e.g. a motor, generator or transformer, comprises a helically wound coil of electric strip having transverse slits extending from one edge across part of its width and being separated by tongues or teeth such that the slits in successive turns of the coil cooperate to define slots extending generally radially of the coil to receive electrical windings. Electrical windings are housed in the slots, and the tongues are bent radially inwards towards the coil axis so as to close the slots at their upper ends to leave substantially no air gap.
Inventors
- 👤 Louis Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:19
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/26; H02K1/12; H02K1/16; H02K15/00; H02K15/02; H02K15/021; H02K15/026; H02K3/00; H02K3/46; H02K3/48; H02K3/487; H02K3/493; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012; Y10T29/4902; Y10T29/49071; Y10T29/49073
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
96 words
A magnet core for an electrical machine comprising a helically wound coil of electric strip having a coil axis, said strip having transverse slits extending from a first edge across part of its width and being separated by tongues such that the slits in successive turns of the coil co-operate to define slots extending generally radially of the coil to receive electrical windings, electrical windings being housed in said slots and said tongues being bent inwardly towards the coil axis so as to close the slots at their upper ends to leave substantially no air gap.
Claim 2
Dependent Claim
96 words
A magnet core for an electrical machine comprising a helically wound coil of electric strip having a coil axis, said strip having transverse slits extending from a first edge across part of its width and being separated by tongues such that the slits in successive turns of the coil co-operate to define slots extending generally radially of the coil to receive electrical windings, electrical windings being housed in said slots and said tongues being bent inwardly towards the coil axis so as to close the slots at their upper ends to leave substantially no air gap.
Claim 3
Dependent Claim
31 words
A magnet core according to claim 1 wherein, at the beginning and end of the coil, lugs formed in successive turns of the strip interengage to prevent the coil from unwinding.
Claim 4
Dependent Claim
21 words
A magnet core according to claim 1, wherein spaces remaining in the slots are filled with a cast mass of metal.
Claim 5
Dependent Claim
13 words
An electrical machine having a stator or rotor core according to claim 1.
Claim 6
Dependent Claim
19 words
A magnet core according to claim 1 wherein the slits in the strip are narrowed at their upper ends.
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) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |