US3567978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial airgap motors with reduced iron losses
Assignee: LOUIS W PARKER TRUSTEE
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Filing: 1969-10-24
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Granted: 1971-03-02
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Expires: 1989-10-24
Abstract
Abstract An axial airgap motor is provided comprising two end rotors, a plurality of stators spaced from one another between said end rotors, and at least one further rotor positioned between the stators. Each end rotor includes a relatively massive magnetic ring having a radial length which is the same as the radial length of the pole pieces in the adjacent stator; and said magnetic ring has an axial cross-sectional area equal to substantially one-half the total radial cross-sectional area of the laminated stacks composing one pole in said adjacent stator.
Inventors
- 👤 Louis W Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:55
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
270 words
An axial airgap motor comprising a main shaft, two end rotors mounted in spaced relation to one another on said shaft for rotation therewith, each of said end rotors comprising a ring of magnetic material carried by a conductive support structure in coaxial relation to said shaft, each of said magnetic rings comprising a plurality of superposed, axially extending laminations of ferrous material having an axial dimension greater than that of its associated conductive support structure, said conductive support structure comprising a unitary casting of conductive nonmagnetic metal having a first ring portion in engagement with and surrounding the outermost periphery of said magnetic ring, said unitary casting also including a second ring portion in engagement with the innermost periphery of said magnetic ring and extending from said innermost periphery to said shaft to support said end rotor on said shaft, and said unitary casting further including integral portions extending radially between said first and second ring portions in firm engagement with radially extending portions of said magnetic ring, a plurality of stators spaced from one another between said end rotors and about said shaft, each of said end rotors and each of said stators comprising a plurality of pole pieces, the radial cross-sectional area of said end rotor pole pieces being substantially 10 percent less than the radial cross-sectional area of the stator pole pieces adjacent thereto, and at least one further rotor positioned between the stators and carried by said shaft for rotation therewith, said further rotor having a maximum axial dimension less than the axial dimension of the laminated magnetic ring in either of said end rotors.
Claim 2
Dependent Claim
270 words
An axial airgap motor comprising a main shaft, two end rotors mounted in spaced relation to one another on said shaft for rotation therewith, each of said end rotors comprising a ring of magnetic material carried by a conductive support structure in coaxial relation to said shaft, each of said magnetic rings comprising a plurality of superposed, axially extending laminations of ferrous material having an axial dimension greater than that of its associated conductive support structure, said conductive support structure comprising a unitary casting of conductive nonmagnetic metal having a first ring portion in engagement with and surrounding the outermost periphery of said magnetic ring, said unitary casting also including a second ring portion in engagement with the innermost periphery of said magnetic ring and extending from said innermost periphery to said shaft to support said end rotor on said shaft, and said unitary casting further including integral portions extending radially between said first and second ring portions in firm engagement with radially extending portions of said magnetic ring, a plurality of stators spaced from one another between said end rotors and about said shaft, each of said end rotors and each of said stators comprising a plurality of pole pieces, the radial cross-sectional area of said end rotor pole pieces being substantially 10 percent less than the radial cross-sectional area of the stator pole pieces adjacent thereto, and at least one further rotor positioned between the stators and carried by said shaft for rotation therewith, said further rotor having a maximum axial dimension less than the axial dimension of the laminated magnetic ring in either of said end rotors.
Claim 3
Dependent Claim
73 words
The motor of claim 1 wherein each of said stators comprises a plurality of pole pieces, each of said magnetic rings having a plurality of radially disposed slots therein, said radially extending integral portions of said casting extending through said slots, the radial length of said slots and of the conductive portions therein being the same as the radial length of the pole pieces in the stator disposed adjacent to said magnetic ring.
Claim 4
Dependent Claim
40 words
The motor of claim 1 wherein each of said magnetic rings has an axial cross-sectional area equal to substantially one-half the total radial cross-sectional area of the pole pieces composing one pole in the stator disposed adjacent to said ring.
Claim 5
Dependent Claim
45 words
The motor of claim 1 wherein said further rotor comprises magnetic material carried by a conductive support, the axial length of the conductive support of said further rotor being greater than the axial length of the conductive support structure in each of said end rotors.
Claim 6
Dependent Claim
31 words
The motor of claim 4 wherein the axial length of the conductive support of each end rotor is substantially one-half the axial length of the conductive support of said further rotor.
Claim 7
Dependent Claim
18 words
The motor of claim 1 wherein said stator pole pieces are composed of magnetically aligned sheet metal laminations.
Claim 8
Dependent Claim
15 words
The motor of claim 1 wherein said inside rotor comprises magnetically aligned sheet metal laminations.
Claim 9
Dependent Claim
264 words
An axial airgap motor comprising a main shaft, two end rotors mounted in spaced relation to one another on said shaft for rotation therewith, each of said end rotors comprising a laminated ring of magnetic material carried by a conductive support structure in coaxial relation to said shaft, the laminations in each of said magnetic rings extending in an axial direction, each of said laminated magnetic rings having radially extending slots therein, said conductive support structure comprising a unitary casting of conductive metal having a first ring portion coaxial with said shaft and engaging the outermost periphery of said magnetic ring, said unitary casting also including a second ring portion coaxial with said shaft engaging the innermost periphery of said magnetic ring and extending from said innermost periphery to said shaft to support said end rotor on said shaft, and said unitary casting further including integral portions extending radially between said first and second ring portions and through said radially extending slots in said magnetic ring, the axial dimension of said first and second ring portions being less than the axial dimension of said magnetic ring, whereby each of said magnetic rings protrudes outwardly from its associated conductive support structure in an axial direction, and a ring-shaped stator disposed between said end rotors in coaxial relation to said shaft, said stator comprising a plurality of magnetic laminations extending in an axial direction, the cross-sectional area of each of said laminated magnetic rings being equal to substantially one-half the total cross-sectional area of the portion of said stator laminations composing one pole in said stator.
Claim 10
Dependent Claim
264 words
An axial airgap motor comprising a main shaft, two end rotors mounted in spaced relation to one another on said shaft for rotation therewith, each of said end rotors comprising a laminated ring of magnetic material carried by a conductive support structure in coaxial relation to said shaft, the laminations in each of said magnetic rings extending in an axial direction, each of said laminated magnetic rings having radially extending slots therein, said conductive support structure comprising a unitary casting of conductive metal having a first ring portion coaxial with said shaft and engaging the outermost periphery of said magnetic ring, said unitary casting also including a second ring portion coaxial with said shaft engaging the innermost periphery of said magnetic ring and extending from said innermost periphery to said shaft to support said end rotor on said shaft, and said unitary casting further including integral portions extending radially between said first and second ring portions and through said radially extending slots in said magnetic ring, the axial dimension of said first and second ring portions being less than the axial dimension of said magnetic ring, whereby each of said magnetic rings protrudes outwardly from its associated conductive support structure in an axial direction, and a ring-shaped stator disposed between said end rotors in coaxial relation to said shaft, said stator comprising a plurality of magnetic laminations extending in an axial direction, the cross-sectional area of each of said laminated magnetic rings being equal to substantially one-half the total cross-sectional area of the portion of said stator laminations composing one pole in said stator.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |