US5489811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permanent magnet alternator
Assignee: Generac Power Systems Inc
•
Filing: 1992-06-11
•
Granted: 1996-02-06
•
Expires: 2012-06-11
Abstract
Abstract A permanent magnet alternator includes a stator core having outwardly projecting teeth and further includes a plurality of permanent magnets surrounding the stator core. The stator core is formed from a continuous, helically wound metallic strip having a plurality of teeth defined between slots formed in one edge thereof. The stator core is formed by winding the strip edgewise around a cylindrical mandrel. To facilitate winding and avoid distortion, arcuate regions, conforming to the curve of the mandrel, are formed in the strip opposite the teeth.
Inventors
- 👤 Robert Kern
- 👤 Gerald Ruehlow
- 👤 Graham McLean
- 👤 Frank Wedel
- 👤 Dennis Cerney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:31
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/22; H02K21/222; H02K1/00; H02K1/06; H02K1/12; H02K1/16; H02K15/00; H02K15/16; H02K2201/00; H02K2201/09; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
128 words
A stator core comprising an elongate magnetically permeable strip having first and second edges and a plurality of regularly spaced teeth formed in said first edge and a plurality of inwardly directed arcuate regions formed opposite said teeth in said second edge, said second edge initially being substantially straight between said teeth, said strip then being helically wound into a substantially radially symmetrical solid with said first edge outermost so that said teeth extend radially outwardly from said solid and said second edge defines a substantially cylindrical hollow region, said inwardly directed arcuate regions serving to facilitate helical winding of said magnetically permeable strip by reducing material stretch in said teeth as said strip is helically wound so that substantially all said material stretch occurs between said teeth.
Claim 2
Dependent Claim
128 words
A stator core comprising an elongate magnetically permeable strip having first and second edges and a plurality of regularly spaced teeth formed in said first edge and a plurality of inwardly directed arcuate regions formed opposite said teeth in said second edge, said second edge initially being substantially straight between said teeth, said strip then being helically wound into a substantially radially symmetrical solid with said first edge outermost so that said teeth extend radially outwardly from said solid and said second edge defines a substantially cylindrical hollow region, said inwardly directed arcuate regions serving to facilitate helical winding of said magnetically permeable strip by reducing material stretch in said teeth as said strip is helically wound so that substantially all said material stretch occurs between said teeth.
Claim 3
Dependent Claim
18 words
A stator core as defined in claim 1 wherein said magnetically permeable strip is of substantially uniform width.
Claim 4
Dependent Claim
40 words
A stator core as defined in claim 1 wherein said magnetically permeable strip includes a plurality of interlocking indentations for locking adjacent turns to each other when said magnetically permeable strip is helically wound into said substantially radially symmetrical solid.
Claim 5
Dependent Claim
28 words
A stator core as defined in claim 1 wherein the radii of curvature of said arcuate regions are substantially equal to the radius of said cylindrical hollow region.
Claim 6
Dependent Claim
86 words
A stator core as defined in claim 1 further comprising an adapter disposed at one end of said radially symmetrical solid, said adapter having a first end defining a helical ramped surface conforming in size and shape to the helical ramped surface formed at said one end of said substantially radially symmetrical solid and having a second end configured for coupling to a prime mover having a shaft, said adapter thereby serving to coaxially align said radially symmetrical solid with the shaft of the prime mover.
Claim 7
Dependent Claim
76 words
Core stock for forming a helically wound stator core of the type having radially outwardly extending teeth, said core stock comprising a magnetically permeable strip having one edge and an other edge and further having a plurality of regularly spaced teeth formed in said one edge thereof, a plurality of inwardly directed arcuate regions formed in said other edge opposite said teeth, and a plurality of straight regions in said other edge substantially between said teeth.
Claim 8
Dependent Claim
76 words
Core stock for forming a helically wound stator core of the type having radially outwardly extending teeth, said core stock comprising a magnetically permeable strip having one edge and an other edge and further having a plurality of regularly spaced teeth formed in said one edge thereof, a plurality of inwardly directed arcuate regions formed in said other edge opposite said teeth, and a plurality of straight regions in said other edge substantially between said teeth.
Claim 9
Dependent Claim
20 words
Core stock as defined in claim 6 wherein said magnetically permeable strip is of substantially uniform width between said teeth.
Claim 10
Dependent Claim
21 words
Core stock as defined in claim 7 wherein said regularly spaced teeth are oriented substantially transversely across said magnetically permeable strip.
Claim 11
Dependent Claim
17 words
Core stock as defined in claim 8 wherein said inwardly directed arcuate regions are substantially arc shaped.
Claim 12
Dependent Claim
20 words
Core stock as defined in claim 9 wherein said arcs are all formed to substantially the same radius of curvature.
Claim 13
Dependent Claim
53 words
Core stock as defined in claim 10 wherein said core stock includes one side and an opposite side and further includes a plurality of regularly spaced punch tabs for defining a protrusion on said one side of said core stock and a similarly located depression on said opposite side of said core stock.
Claim 14
Dependent Claim
14 words
Core stock as defined in claim 11 wherein said core stock comprises a punching.
Claim 15
Dependent Claim
15 words
Core stock as defined in claim 12 wherein said core stock is formed of steel.
Claim 16
Dependent Claim
15 words
Core stock as defined in claim 13 wherein said teeth are of substantially uniform length.
Claim 17
Dependent Claim
178 words
A stator core comprising an elongate magnetically permeable strip having first and second edges and a plurality of regularly spaced teeth formed in said first edge and a plurality of inwardly directed arcuate regions formed opposite said teeth in said second edge, said strip being helically wound into a substantially radially symmetrical solid with said first edge outermost so that said teeth extend radially outwardly from said solid and said second edge defines a substantially cylindrical hollow region, said inwardly directed arcuate regions serving to facilitate helical winding of said magnetically permeable strip by reducing material stretch in said teeth as said metallic strip is helically wound, said stator core further comprising an adapter disposed at one end of said radially symmetrical solid, said adapter having a first end defining a helical ramped surface formed at said one end of said substantially radially symmetrical solid and having a second end configured for coupling to a prime mover having a shaft, said adapter thereby serving to coaxially align said radially symmetrical solid with the shaft of the prime mover.
Claim 18
Dependent Claim
178 words
A stator core comprising an elongate magnetically permeable strip having first and second edges and a plurality of regularly spaced teeth formed in said first edge and a plurality of inwardly directed arcuate regions formed opposite said teeth in said second edge, said strip being helically wound into a substantially radially symmetrical solid with said first edge outermost so that said teeth extend radially outwardly from said solid and said second edge defines a substantially cylindrical hollow region, said inwardly directed arcuate regions serving to facilitate helical winding of said magnetically permeable strip by reducing material stretch in said teeth as said metallic strip is helically wound, said stator core further comprising an adapter disposed at one end of said radially symmetrical solid, said adapter having a first end defining a helical ramped surface formed at said one end of said substantially radially symmetrical solid and having a second end configured for coupling to a prime mover having a shaft, said adapter thereby serving to coaxially align said radially symmetrical solid with the shaft of the prime mover.
References Cited (Backward Citations)
US3178630A
Cited
US3246228A
Cited
US3350621A
Cited
US3419783A
Cited
US3577851A
Cited
USRE26641E
Cited
US3539900A
Cited
US3663945A
Cited
US3809034A
Cited
US3916284A
Cited
US4115729A
Cited
US4117389A
Cited
US4102040A
Cited
US4119861A
Cited
US4079307A
Cited
US4188926A
Cited
US4280072A
Cited
US4392073A
Cited
US4303843A
Cited
US4364169A
Cited
US4365180A
Cited
US4549104A
Cited
US4636761A
Cited
US4719378A
Cited
US4626727A
Cited
US4901428A
Cited
US4661761A
Cited
US4835839A
Cited
US4761576A
Cited
US4728842A
Cited
US4739203A
Cited
US4838226A
Cited
US4932375A
Cited
US4918343A
Cited
US5003948A
Cited
US5033433A
Cited
US5081388A
Cited
US5142178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-05 | 1999-08-07 | 2000-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-05 | 2003-08-07 | 2004-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-05 | 2007-08-07 | 2008-02-06 | $7700.00 | Window Closed / Lapsed |