US3737696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed homopolar inductor generator with straight winding construction
Assignee: General Electric Co
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Filing: 1971-09-16
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Granted: 1973-06-05
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Expires: 1991-09-16
Abstract
Abstract A high speed homopolar generator is described capable of operating efficiently at rotational speeds of 90,000 rpm and above. The generator includes a smooth cylindrical rotor with axially in-line magnetic north and south poles at opposite ends of the rotor. The AC windings in the individual stator stacks are offset by 180 electrical degrees as they pass between stacks to insure that the induced voltage in the active portions of each winding are of the proper polarity. The cylindrical rotor construction minimizes windage losses and includes a straight bar of magnetic material with the circumferential interpolar space filled with a non-magnetic material. The non-magnetic material is bonded to the magnetic bar so that the resulting magnetic-nonmagnetic composite rotor is strong enough to withstand the mechanical stresses to which it is subjected at speeds in excess of 90,000 rpm. Layers of the non-magnetic material are deposited on the bar of magnetic material by a plasma-arc hot wire welding process and the assembly is then machined into the desired cylindrical shape to minimize windage. In this fashion, the geometry of the rotor is optimized, the maximum amount of axial magnetic section is obtained with the simplest rotor geometry, the requisite physical strength is obtained, while at the same time, reducing or minimizing windage at the very high velocities obtained in the machine.
Inventors
- 👤 E Richter
- 👤 G Brissey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:28
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/24; H02K15/00; H02K15/02; H02K15/021; H02K15/022; H02K19/00; H02K19/16; H02K19/18; H02K19/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
76 words
A high-speed homopolar generator comprising, a. A housing, b. A pair of stators mounted in said housing and having means to receive a plurality of alternating current windings, c. A high speed, smooth surfaced, composite, cylindrical rotor adapted to rotate in the stator bore including, 1. magnetic material extending the length of the rotor and traversed by a magnetic field to produce axially in-line north and south magnetic poles at opposite ends of the rotor axis,
Claim 2
Dependent Claim
76 words
A high-speed homopolar generator comprising, a. A housing, b. A pair of stators mounted in said housing and having means to receive a plurality of alternating current windings, c. A high speed, smooth surfaced, composite, cylindrical rotor adapted to rotate in the stator bore including, 1. magnetic material extending the length of the rotor and traversed by a magnetic field to produce axially in-line north and south magnetic poles at opposite ends of the rotor axis,
Claim 3
Dependent Claim
21 words
The high speed homopolar generator according to claim 1 wherein said field winding comprises an annular coil positioned between said stators.
Claim 4
Dependent Claim
118 words
A mass of non-magnetic material bonded to the magnetic material along the length thereof comprising a plurality of layers of magnetic materials the width of said layers decreasing in the outward direction from said bar, d. A stator field winding for generating a magnetic field traversing said housing, the stators, and the rotor to produce magnetic poles in said rotor, e. Alternating current winding means wound in each of said pair of stators, the conductors of said windings being offset in passing from one stator to the other to produce a displacement of 180 electrical degrees between the windings disposed in the individual stators so that the rotor magnetic poles induce an alternating current voltage in said windings.
Claim 5
Dependent Claim
118 words
A mass of non-magnetic material bonded to the magnetic material along the length thereof comprising a plurality of layers of magnetic materials the width of said layers decreasing in the outward direction from said bar, d. A stator field winding for generating a magnetic field traversing said housing, the stators, and the rotor to produce magnetic poles in said rotor, e. Alternating current winding means wound in each of said pair of stators, the conductors of said windings being offset in passing from one stator to the other to produce a displacement of 180 electrical degrees between the windings disposed in the individual stators so that the rotor magnetic poles induce an alternating current voltage in said windings.
Claim 6
Dependent Claim
118 words
A mass of non-magnetic material bonded to the magnetic material along the length thereof comprising a plurality of layers of magnetic materials the width of said layers decreasing in the outward direction from said bar, d. A stator field winding for generating a magnetic field traversing said housing, the stators, and the rotor to produce magnetic poles in said rotor, e. Alternating current winding means wound in each of said pair of stators, the conductors of said windings being offset in passing from one stator to the other to produce a displacement of 180 electrical degrees between the windings disposed in the individual stators so that the rotor magnetic poles induce an alternating current voltage in said windings.
Claim 7
Dependent Claim
118 words
A mass of non-magnetic material bonded to the magnetic material along the length thereof comprising a plurality of layers of magnetic materials the width of said layers decreasing in the outward direction from said bar, d. A stator field winding for generating a magnetic field traversing said housing, the stators, and the rotor to produce magnetic poles in said rotor, e. Alternating current winding means wound in each of said pair of stators, the conductors of said windings being offset in passing from one stator to the other to produce a displacement of 180 electrical degrees between the windings disposed in the individual stators so that the rotor magnetic poles induce an alternating current voltage in said windings.
Claim 8
Dependent Claim
48 words
The high speed homopolar generator according to claim 1 wherein said rotor comprises a bar of magnetic material extending the length of the rotor and said non-magnetic material comprises a plurality of plasma-arc welded layers of non-magnetic material of decreasing width to form a smooth, composite, cylindrical rotor.
Claim 9
Dependent Claim
22 words
The high speed homopolar generator according to claim 3 wherein the bar of magnetic material in said rotor has substantially constant cross-section.
Claim 10
Dependent Claim
75 words
A composite, cylindrical, solid rotor for a homopolar machine comprising, a. A shaft b. An elongated member of magnetic material mounted on said shaft and extending the entire length of the rotor to provide axially in-line magnet rotor poles, c. Non magnetic material bonded to opposite faces of the elongated magnetic member to form therewith the composite cylindrical rotor, said magnetic material comprising a plurality of individually bonded layers of non-magnetic material of varying widths.
Claim 11
Dependent Claim
75 words
A composite, cylindrical, solid rotor for a homopolar machine comprising, a. A shaft b. An elongated member of magnetic material mounted on said shaft and extending the entire length of the rotor to provide axially in-line magnet rotor poles, c. Non magnetic material bonded to opposite faces of the elongated magnetic member to form therewith the composite cylindrical rotor, said magnetic material comprising a plurality of individually bonded layers of non-magnetic material of varying widths.
Claim 12
Dependent Claim
68 words
The composite rotor for a homopolar machine as defined in claim 5 wherein said elongated member comprises a straight bar of magnetic material of substantially constant cross-section and a plurality of plasma-arc welded layers of the non-magnetic material of varying widths constitute the mass of non-magnetic material bonded to the bar. What I claim is new and desire to secure by Letters Patent of the United States is:
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |