US3892987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Commutating method and apparatus for DC permanent magnet machines
Assignee: Kollmorgen Corp
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Filing: 1974-01-30
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Granted: 1975-07-01
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Expires: 1994-01-30
Abstract
Abstract A DC permanent magnet machine in which the functions typically attributed to the stator and rotor assemblies are reversed to provide an ''''inside out'''' design. The stator is provided with a plurality of electrically energizeable poles, the windings of which are electrically coupled to associated pairs of commutator bars incorporated within an annular array. The stator further includes first and second conductive rings, each being electrically connected to respective polarities of DC source. The rotor is provided with a plurality of poles equal in number to the poles provided in the stator. First and second groups of ring brushes and associated commutator brushes are anchored to the rotor. The first and second groups of ring brushes respectively slidably engage the first and second conductive rings. The ring brushes comprising said first group and the ring brushes comprising said second group are each electrically connected to an associated commutator brush. The commutator brushes are arranged in annular fashion and make progressive sliding engagement with the commutator bars of the stator assembly providing electrical power to associated coils of the stator winding. The interaction of the magnetic field created by the energized stator coils and the fields of the permanent magnets in the rotor assembly causes rotation of the rotor which, in turn, rotates the ring brushes and commutator brushes to continuously and progressively switch the DC source to succeeding stator coils.
Inventors
- 👤 Samuel Noodleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:27
CPC Classifications
H; H02; H02K; H02K13/00; H02K13/006; H02K23/00; H02K23/62; H02K25/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
201 words
Switching apparatus for a machine responsive to a source of DC power and having interacting rotor and stator assemblies which rotate relative to each other, the rotor having at least a twopole permanent magnet structure for creating a magnetic field and the stator having a winding with a plurality of energizeable coils arranged at spaced intervals around the stator, said coils having an array of commutator bars associated therewith for supplying electrical power thereto for progressively creating magnetic fields in said stator which interact with those in said rotor, said apparatus comprising: a. first and second spaced conductive rings associated with said stator, said conductive rings being positioned proximate said commutator bars; b. means for respectively coupling each of said conductive rings to opposite polarities of said DC source; and c. first and second actuating means associated with said rotor, said first and second actuating means being adapted to progressively and sequentially electrically couple said first and said conductive rings to the commutator bars during the relative rotation so as to momentarily and progressively couple each coil to both polarities of said source and to couple each subsequent coil across said source before the preceding coil is decoupled from said source.
Claim 2
Dependent Claim
201 words
Switching apparatus for a machine responsive to a source of DC power and having interacting rotor and stator assemblies which rotate relative to each other, the rotor having at least a twopole permanent magnet structure for creating a magnetic field and the stator having a winding with a plurality of energizeable coils arranged at spaced intervals around the stator, said coils having an array of commutator bars associated therewith for supplying electrical power thereto for progressively creating magnetic fields in said stator which interact with those in said rotor, said apparatus comprising: a. first and second spaced conductive rings associated with said stator, said conductive rings being positioned proximate said commutator bars; b. means for respectively coupling each of said conductive rings to opposite polarities of said DC source; and c. first and second actuating means associated with said rotor, said first and second actuating means being adapted to progressively and sequentially electrically couple said first and said conductive rings to the commutator bars during the relative rotation so as to momentarily and progressively couple each coil to both polarities of said source and to couple each subsequent coil across said source before the preceding coil is decoupled from said source.
Claim 3
Dependent Claim
24 words
The switching apparatus of claim 1 wherein said first and second conductive rings are disposed on one side of said array of commutator bars.
Claim 4
Dependent Claim
24 words
The switching apparatus of claim 1 wherein said first and second conductive rings are disposed on opposite sides of said array of commutator bars.
Claim 5
Dependent Claim
40 words
The switching apparatus of claim 1 wherein said first and second actuating means each comprises first and second electrically connected brush assemblies rotatable with said rotor assembly for respectively wipingly engaging one of said conductive rings and said commutator bars.
Claim 6
Dependent Claim
217 words
Switching apparatus for a machine responsive to a source of DC power and having interacting rotor and stator assemblies which rotate relative to each other, the rotor having at least a two-pole permanent magnet structure for creating a magnetic field and the stator having a winding with a plurality of energizeable coils arranged at spaced intervals around the stator, said coils having an array of commutator bars associated therewith for supplying electrical power thereto for progressively creating magnetic fields in said stator which interact with those in said rotor, said apparatus comprising: a. first and second spaced conductive rings associated with said stator, said conductive rings being positioned proximate said commutator bars; b. means for respectively coupling each of said conductive rings to opposite polarities of said DC source; and c. drum means associated with said rotor and adapted to rotate therewith, said drum means having first and second actuating means mounted thereon, said first and second actuating means each comprising brush assemblies adapted to progressively and sequentially electrically couple said first and second conductive rings to the commutator bars during the relative rotation so as to momentarily and progressively couple each cOil to both polarities of said source and to couple each subsequent coil across said source before the preceding coil is decoupled from said source.
Claim 7
Dependent Claim
217 words
Switching apparatus for a machine responsive to a source of DC power and having interacting rotor and stator assemblies which rotate relative to each other, the rotor having at least a two-pole permanent magnet structure for creating a magnetic field and the stator having a winding with a plurality of energizeable coils arranged at spaced intervals around the stator, said coils having an array of commutator bars associated therewith for supplying electrical power thereto for progressively creating magnetic fields in said stator which interact with those in said rotor, said apparatus comprising: a. first and second spaced conductive rings associated with said stator, said conductive rings being positioned proximate said commutator bars; b. means for respectively coupling each of said conductive rings to opposite polarities of said DC source; and c. drum means associated with said rotor and adapted to rotate therewith, said drum means having first and second actuating means mounted thereon, said first and second actuating means each comprising brush assemblies adapted to progressively and sequentially electrically couple said first and second conductive rings to the commutator bars during the relative rotation so as to momentarily and progressively couple each cOil to both polarities of said source and to couple each subsequent coil across said source before the preceding coil is decoupled from said source.
Claim 8
Dependent Claim
33 words
The apparatus of claim 5 wherein said first and second actuating means each comprises first and second brush assemblies for respectively wipingly engaging said first and second conductive rings and said commutator bars.
Claim 9
Dependent Claim
34 words
The apparatus of claim 6 wherein said first and second brush assemblies are angularly displaced from one another about said drum means so as to simultaneously engage commutator bars associated with the same coil.
Claim 10
Dependent Claim
44 words
The apparatus of claim 5 wherein said drum means comprises a cylindrical shaped insulating member having openings for receiving said brush assemblies and wherein each brush assembly comprises a brush member slidably mounted in one of said drum openings and spring biased radially outward.
Claim 11
Dependent Claim
27 words
The apparatus of claim 1 wherein the longitudinal axes of said commutator bars are offset at an angle relative to the rotating axis of said rotor shaft.
References Cited (Backward Citations)
US2747116A
Cited
US3341726A
Cited
US3396296A
Cited
US3534203A
Cited
US3631273A
Cited
US3603823A
Cited
US3769535A
Cited
US3678359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |