Patent US4159434A successfully refreshed from Google Patents.
US4159434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial gap inductor alternator
Assignee: General Electric Co
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Filing: 1977-10-21
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Granted: 1979-06-26
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Expires: 1997-10-21
Abstract
Abstract A high speed inductor alternator employs axial air gaps, enabling a nonmagnetic filler in the portion of the gap extending into the solid rotor to be securely bonded to the rotor against the action of centrifugal force. This configuration permits use of axial poles on the rotor, and results in a machine that is substantially shorter, axially, than a conventional radial air gap inductor alternator of comparable output ratings.
Inventors
- 👤 Swarn S. Kalsi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:43
CPC Classifications
H; H02; H02K; H02K19/00; H02K19/16; H02K19/22; H02K19/24
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
139 words
A high speed inductor alternator comprising: a metallic stator frame having a circular channel formed in an axial face thereof; a circular excitation winding situated within said channel; a stator core embedded within said channel on either radial side of said circular excitation winding; A.c. armature windings extending radially across said excitation winding and said stator core on either radial side of said circular excitation winding; and a metallic rotor having an axial face situated closely adjacent said A.C. armature windings and containing an even number of axially-directed arcuate slots, said slots each being of substantially identical size and shape and being filled with nonmagnetic material, each alternate pair of diametrically-opposite filled arcuate slots being located radially-outward of said circular excitation winding and the remaining pairs of diametrically-opposite filled arcuate slots being located radially-inward of said circular excitation winding.
Claim 2
Dependent Claim
139 words
A high speed inductor alternator comprising: a metallic stator frame having a circular channel formed in an axial face thereof; a circular excitation winding situated within said channel; a stator core embedded within said channel on either radial side of said circular excitation winding; A.c. armature windings extending radially across said excitation winding and said stator core on either radial side of said circular excitation winding; and a metallic rotor having an axial face situated closely adjacent said A.C. armature windings and containing an even number of axially-directed arcuate slots, said slots each being of substantially identical size and shape and being filled with nonmagnetic material, each alternate pair of diametrically-opposite filled arcuate slots being located radially-outward of said circular excitation winding and the remaining pairs of diametrically-opposite filled arcuate slots being located radially-inward of said circular excitation winding.
Claim 3
Dependent Claim
17 words
The apparatus of claim 1 wherein said stator core is comprised of circular laminations of magnetic steel.
Claim 4
Dependent Claim
14 words
The apparatus of claim 2 wherein said excitation winding is of rectangular cross section.
Claim 5
Dependent Claim
14 words
The apparatus of claim 1 wherein said nonmagnetic material comprises a nickel chromium alloy.
Claim 6
Dependent Claim
14 words
The apparatus of claim 2 wherein said nonmagnetic material comprises a nickel chromium alloy.
Claim 7
Dependent Claim
14 words
The apparatus of claim 4 wherein said excitation winding is of rectangular cross section.
Claim 8
Dependent Claim
14 words
The apparatus of claim 5 wherein said excitation winding is of rectangular cross section.
Claim 9
Dependent Claim
18 words
The apparatus of claim 1 wherein said armature windings are embedded in radial slots in said stator core.
Claim 10
Dependent Claim
22 words
The apparatus of claim 2 wherein said armature windings are embedded in radial slots formed on the exposed edges of said laminations.
Claim 11
Dependent Claim
22 words
The apparatus of claim 7 wherein said armature windings are embedded in radial slots formed on the exposed edges of said laminations.
Claim 12
Dependent Claim
20 words
The apparatus of claim 1 wherein said axial face of said metallic rotor is undercut radially-inward of said stator core.
Claim 13
Dependent Claim
156 words
A high speed inductor alternator comprising: a metallic stator frame having a circular channel formed in an axial face thereof; a circular excitation winding of rectangular cross section situated within said channel and adapted for D.C. energization; cylindrically-rolled laminations of magnetic steel embedded within said channel on either radial side of said circular excitation winding and having radial slots formed on the exposed edges thereof; three phase A.C. armature windings embedded in said radial slots formed on the edges of said laminations; and a metallic disk having an axial face situated closely adjacent said A.C. armature windings and containing an even number of axially-directed arcuate slots, said slots each being of substantially identical size and shape and being filled with a nonmagnetic metal, each alternate pair of diametrically-opposite filled arcuate slots being located radially-outward of said circular excitation winding and the remaining pairs of diametrically-opposite filled arcuate slots being located radially-inward of said circular excitation winding.
Claim 14
Dependent Claim
156 words
A high speed inductor alternator comprising: a metallic stator frame having a circular channel formed in an axial face thereof; a circular excitation winding of rectangular cross section situated within said channel and adapted for D.C. energization; cylindrically-rolled laminations of magnetic steel embedded within said channel on either radial side of said circular excitation winding and having radial slots formed on the exposed edges thereof; three phase A.C. armature windings embedded in said radial slots formed on the edges of said laminations; and a metallic disk having an axial face situated closely adjacent said A.C. armature windings and containing an even number of axially-directed arcuate slots, said slots each being of substantially identical size and shape and being filled with a nonmagnetic metal, each alternate pair of diametrically-opposite filled arcuate slots being located radially-outward of said circular excitation winding and the remaining pairs of diametrically-opposite filled arcuate slots being located radially-inward of said circular excitation winding.
Claim 15
Dependent Claim
14 words
The apparatus of claim 12 wherein said nonmagnetic material comprises a nickel chromium alloy.
Claim 16
Dependent Claim
20 words
The apparatus of claim 12 wherein said axial face of said metallic disk is undercut radially-inward of said stator core.
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) | 1982-06-25 | 1982-12-25 | 1983-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-25 | 1986-12-25 | 1987-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-25 | 1990-12-25 | 1991-06-26 | $7700.00 | Window Closed / Lapsed |