US4458228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary positioning apparatus and associated methods, such as for a carburetor choke valve
Assignee: Pierburg GmbH
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Filing: 1981-11-03
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Granted: 1984-07-03
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Expires: 2001-11-03
Abstract
Abstract Rotary positioning apparatus for a member movable through an angle of rotation of less than 360° comprising a rotor including windings thereon and a stator including a permanent magnet establishing a magnetic circuit providing magnetic flux through which the rotor is movable, the rotor and stator constituting a DC motor. The stator includes a stationary hollow shaft on which the rotor is rotatably supported by bearings. The rotor includes a neck adapted for being coupled with the member to be moved. A plurality of flexible current carrying wires extend through the hollow shaft and through slots provided in the neck to the windings for energization thereof. The hollow shaft has opposite open ends at one of which the wires enter the hollow shaft and at the other of which the wires exit from the shaft and extend through the slots to the windings such that the wires undergo twisting within the confines of the shaft as the rotor rotates with respect to the stator.
Inventors
- 👤 Hans Baumgartner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:23
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/14; H01F7/145; F; F02; F02D; F02D31/00; H02; H02K; H02K26/00
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
183 words
Rotary positioning apparatus for a member movable through an angle of rotation of less than 360°, said apparatus comprising a rotor including windings thereon, a stator including a permanent magnet establishing a magnetic circuit providing magnetic flux through which said rotor is movable, said rotor and stator constituting a DC motor, said stator including a stationary hollow shaft, bearing means rotatably supporting said rotor on said hollow shaft, said rotor including a neck, means on said neck for coupling the neck with the member to be moved, means for energizing said windings on the rotor for producing rotation of the rotor, the latter means comprising a plurality of flexible current carrying wires extending through said hollow shaft and through slot means provided in said neck to said windings, said hollow shaft having opposite open ends at one of which said wires enter the hollow shaft and at the other of which said wires exit from said shaft and extend through said slot means to said windings, said wires undergoing twisting within said stationary shaft as said rotor rotates with respect to said stator.
Claim 2
Dependent Claim
183 words
Rotary positioning apparatus for a member movable through an angle of rotation of less than 360°, said apparatus comprising a rotor including windings thereon, a stator including a permanent magnet establishing a magnetic circuit providing magnetic flux through which said rotor is movable, said rotor and stator constituting a DC motor, said stator including a stationary hollow shaft, bearing means rotatably supporting said rotor on said hollow shaft, said rotor including a neck, means on said neck for coupling the neck with the member to be moved, means for energizing said windings on the rotor for producing rotation of the rotor, the latter means comprising a plurality of flexible current carrying wires extending through said hollow shaft and through slot means provided in said neck to said windings, said hollow shaft having opposite open ends at one of which said wires enter the hollow shaft and at the other of which said wires exit from said shaft and extend through said slot means to said windings, said wires undergoing twisting within said stationary shaft as said rotor rotates with respect to said stator.
Claim 3
Dependent Claim
87 words
Rotary positioning apparatus as claimed in claim 1 wherein said slot means comprises slots in said neck extending axially of said neck and present in a number equal to the number of wires, said apparatus further comprising an insulative soldering lug for each wire establishing connection between said wire and the rotor windings, each lug including an end portion engaged in a respective said slot corresponding to the associated wire, and a hollow plug in said neck holding the end portions of the lugs in the slots.
Claim 4
Dependent Claim
30 words
Rotary positioning apparatus as claimed in claim 2 wherein said plug includes noses engaged in said slots and holding the end portions of the lugs against ends of the slots.
Claim 5
Dependent Claim
32 words
Rotary positioning apparatus as claimed in claim 3 further comprising clamping means holding said wires in fixed relation with said rotor where they exit from said other end of said hollow shaft.
Claim 6
Dependent Claim
42 words
Rotary positioning apparatus as claimed in claim 4 wherein said plug has curved guide surfaces on which said wires respectively pass, said clamping means comprising a member of resilient material secured in said neck and pressing said wires against said guide surfaces.
Claim 7
Dependent Claim
39 words
Rotary positioning apparatus as claimed in claim 5 wherein said plug has a bore through which said wires extend to said guide surfaces, said bore in said plug having a smaller diameter than the bore in said hollow shaft.
Claim 8
Dependent Claim
24 words
Rotary positioning apparatus as claimed in claim 6 wherein the bore in the plug and the bore in the hollow shaft are substantially coaxial.
Claim 9
Dependent Claim
17 words
Rotary positioning apparatus as claimed in claim 7 wherein the bore in said plug is conically tapered.
Claim 10
Dependent Claim
27 words
Rotary positioning apparatus as claimed in claim 6 or 8 wherein said bore in said shaft includes an anti-friction lining at said other end of said shaft.
Claim 11
Dependent Claim
40 words
Rotary positioning apparatus as claimed in claim 5 comprising a closure member securing said member of resilient material in said neck, said closure member being operatively coupled to the member which is to be moved by the rotary positioning apparatus.
Claim 12
Dependent Claim
28 words
Rotary positioning apparatus as claimed in claim 1 comprising stop means on said rotor and stator for limiting the angular movement of the rotor to less than 360°.
Claim 13
Dependent Claim
38 words
Rotary positioning apparatus as claimed in claim 1 wherein said bearing means comprises first and second bearings axially spaced on said hollow shaft rotatably supporting said rotor, and spring means for applying elastic force axially of said bearings.
Claim 14
Dependent Claim
104 words
Rotary positioning apparatus as claimed in claim 12 wherein each bearing includes an inner race, an outer race, and bearing members between the inner and outer races, said spring means having one end acting on said shaft and an opposite end acting on the inner race of the first bearing, the outer races of the first and second bearings abutting against said rotor, said inner race of said second bearing being acted on by said shaft such that the resilient action of the spring is transmitted through the outer races of the bearings and the rotor to the inner race of the second bearing.
Claim 15
Dependent Claim
27 words
Rotary positioning apparatus as claimed in claim 12 wherein said first and second bearings are disposed in said neck and said rotor is suspended on said shaft.
Claim 16
Dependent Claim
27 words
Rotary positioning apparatus as claimed in claim 14 wherein said neck includes a support shaft for operating the member which is movable by the rotary positioning apparatus.
Claim 17
Dependent Claim
20 words
Rotary positioning apparatus as claimed in claim 1 wherein said rotor includes a drum on which said windings are wound.
Claim 18
Dependent Claim
42 words
Rotary positioning apparatus as claimed in claim 16 wherein said permanent magnet is on said shaft, said apparatus further comprising a housing of magnetizable material surrounding said rotor and defining a flux gap with said permanent magnet in which said rotor travels.
Claim 19
Dependent Claim
26 words
Rotary positioning apparatus as claimed in claim 1 wherein said stator includes a core of magnetizable material on said shaft, said permanent magnet surrounding said rotor.
Claim 20
Dependent Claim
16 words
Rotary positioning apparatus as claimed in claim 18 wherein said permanent magnet comprises a hollow cylinder.
Claim 21
Dependent Claim
15 words
Rotary positioning apparatus as claimed in claim 18 wherein said permanent magnet comprises annular segments.
Claim 22
Dependent Claim
18 words
Rotary positioning apparatus as claimed in claim 18 wherein said magnetizable material of said core is soft iron.
Claim 23
Dependent Claim
21 words
Rotary positioning apparatus as claimed in claim 18 comprising a housing surrounding said rotor, said permanent magnet being on said housing.
Claim 24
Dependent Claim
37 words
Rotary positioning apparatus as claimed in claim 22 wherein said permanent magnet and core define a flux gap in which said rotor travels, said rotor including a drum of magnetizable material on which said windings are wound.
Claim 25
Dependent Claim
38 words
Rotary positioning apparatus as claimed in claim 22 wherein said bearing means comprises first and second bearings axially spaced on said hollow shaft rotatably supporting said rotor, and spring means for applying elastic force axially of said bearings.
Claim 26
Dependent Claim
27 words
Rotary positioning apparatus as claimed in claim 24 wherein said first and second bearings are disposed in said neck and said rotor is suspended on said shaft.
Claim 27
Dependent Claim
27 words
Rotary positioning apparatus as claimed in claim 22 wherein said neck includes a support shaft for operating the member which is movable by the rotary positioning apparatus.
Claim 28
Dependent Claim
39 words
Rotary positioning apparatus as claimed in claim 22 further comprising a second hollow shaft fixed to said rotor and extending into the first said hollow shaft, said first and second bearings being between said first and second hollow shafts.
Claim 29
Dependent Claim
16 words
Rotary positioning apparatus as claimed in claim 27 wherein said wires extend within said second shaft.
References Cited (Backward Citations)
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Cited
US3820047A
Cited
US4021690A
Cited
US3976965A
Cited
US4032807A
Cited
US4345228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |