Patent US4761580A successfully refreshed from Google Patents.
US4761580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic top wedge
Assignee: Magnetek Inc
•
Filing: 1987-06-17
•
Granted: 1988-08-02
•
Expires: 2007-06-17
Abstract
Abstract A magnetic top wedge for dynamoelectric machinery core slots is disclosed having laminated ferromagnetic segments aligned by an eccentric aperture and enclosed in an electrically insulating and spacing carrier.
Inventors
- 👤 Bruce Hein
- 👤 Charles Shufflebarger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:21
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/46; H02K3/48; H02K3/487; H02K3/493
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
121 words
An improvement for dynamo electric machinery of the type having a core structure including slots with walls and slot wedges of the type having a stack of laminations of ferromagnetic material, the improvement comprising an insulating layer of material interposed between opposing sides of said lamination stack and adjacent slot walls such that said laminations are arranged to form an extension of the magnetic path across the slot opening and the insulating layer is arranged to form a magnetic gap of predetermined length in the magnetic path across the slot opening, said wedge laminations further comprising a keyhole shaped notch having an enlarged portion centered at a point on the lamination other than the center of gravity of the lamination cross-section.
Claim 2
Dependent Claim
121 words
An improvement for dynamo electric machinery of the type having a core structure including slots with walls and slot wedges of the type having a stack of laminations of ferromagnetic material, the improvement comprising an insulating layer of material interposed between opposing sides of said lamination stack and adjacent slot walls such that said laminations are arranged to form an extension of the magnetic path across the slot opening and the insulating layer is arranged to form a magnetic gap of predetermined length in the magnetic path across the slot opening, said wedge laminations further comprising a keyhole shaped notch having an enlarged portion centered at a point on the lamination other than the center of gravity of the lamination cross-section.
Claim 3
Dependent Claim
24 words
The improvement of claim 1 wherein said insulating layer on each opposing stack side is substantially equal to one half of said gap length.
Claim 4
Dependent Claim
14 words
The improvement of claim 1 wherein said opposing lamination sides converge towards each other.
Claim 5
Dependent Claim
11 words
The improvement of claim 3 wherein said laminations are generally trapezoidal.
Claim 6
Dependent Claim
16 words
The improvement of claim 4 wherein said stack is enclosed by a channel of insulating material.
Claim 7
Dependent Claim
12 words
The improvement of claim 5 wherein said channel has a trapezoidal cross-section.
Claim 8
Dependent Claim
13 words
The improvement of claim 5 in combination with a motor stator core structure.
Claim 9
Dependent Claim
30 words
The improvement of claim 7 wherein the non-parallel sides of said channel trapezoidal cross-section are each parallel to a side of the slot opening in which said wedge is installed.
Claim 10
Dependent Claim
36 words
The improvement of claim 1 in combination with a motor stator lamination stack having a slot opening cross-section keyed by its configuration to conform to the configuration of the opposing sides of the insulated wedge stack.
Claim 11
Dependent Claim
14 words
The improvement of claim 1 wherein the insulating layer of material comprises a plastic.
Claim 12
Dependent Claim
14 words
The improvement of claim 1 wherein the insulating layer of material comprises an epoxy.
References Cited (Backward Citations)
DE523047C
Cited
GB169482A
Cited
FR556266A
Cited
FR721516A
Cited
US3009073A
Cited
FR1190819A
Cited
US3437858A
Cited
US3780325A
Cited
SU609179A1
Cited
JPS54113806A
Cited
US4701648A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-02 | 1992-02-01 | 1992-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-02 | 1996-02-01 | 1996-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-02 | 2000-02-01 | 2000-08-02 | $7700.00 | Window Closed / Lapsed |