Patent US3285001A successfully refreshed from Google Patents.
US4935655A
Expired / Lapsed
US
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Direct-current machine comprising a permanent-magnetic stator
Assignee: Alcatel Lucent Deutschland AG
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Filing: 1988-10-27
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Granted: 1990-06-19
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Expires: 2008-10-27
Abstract
Abstract In a direct-current machine comprising a permanent-magnetic stator, the detent torque or resting moment of the rotor is to be reduced by simple and low-cost technical means. This is achieved by disposing the permanent-magnet shells of the stator asymmetrically with respect to each other.
Inventors
- 👤 Jens Ebner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:36
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/02; H02K23/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
A direct-current machine comprising: a rotor armature having an annular ring including a plurality of circumferentially spaced radial winding slots, with adjacent ones of said spaced winding slots defining a pitch angle therebetween; and a permanent-magnet stator disposed around said rotor armature, said permanent-magnet stator having at least one pair of circumferentially spaced permanent-magnet shells, each one of said spaced permanent-magnet shells having a radial axis of symmetry, and the axes of symmetry of a pair of shells of said at least one pair of permanent-magnet shells intersecting at an angle (α) equal to half the pitch angle of adjacent winding slots of said rotor armature for reducing the resting moment of the direct-current machine.
Claim 2
Dependent Claim
115 words
A direct-current machine comprising: a rotor armature having an annular ring including a plurality of circumferentially spaced radial winding slots, with adjacent ones of said spaced winding slots defining a pitch angle therebetween; and a permanent-magnet stator disposed around said rotor armature, said permanent-magnet stator having at least one pair of circumferentially spaced permanent-magnet shells, each one of said spaced permanent-magnet shells having a radial axis of symmetry, and the axes of symmetry of a pair of shells of said at least one pair of permanent-magnet shells intersecting at an angle (α) equal to half the pitch angle of adjacent winding slots of said rotor armature for reducing the resting moment of the direct-current machine.
Claim 3
Dependent Claim
134 words
A direct-current machine comprising: a rotor armature having an annular ring of a plurality of circumferentially spaced radial winding slots, with adjacent ones of said spaced winding slots defining a pitch angle therebetween; and means for reducing the resting moment of the direct-current machine, said means for reducing the resting moment including a permanent-magnet stator disposed around said rotor armature, said permanent-magnet stator having at least one pair of circumferentially spaced permanent-magnet shells, each one of said spaced permanent-magnet shells having a radial axis of symmetry and being asymmetrically arranged with respect to each other so that the axes of symmetry of each shell of each pair of spaced permanent-magnet shells intersect at an angle (α) equal to half the pitch angle of adjacent ones of said spaced winding slots of said rotor armature.
Claim 4
Dependent Claim
134 words
A direct-current machine comprising: a rotor armature having an annular ring of a plurality of circumferentially spaced radial winding slots, with adjacent ones of said spaced winding slots defining a pitch angle therebetween; and means for reducing the resting moment of the direct-current machine, said means for reducing the resting moment including a permanent-magnet stator disposed around said rotor armature, said permanent-magnet stator having at least one pair of circumferentially spaced permanent-magnet shells, each one of said spaced permanent-magnet shells having a radial axis of symmetry and being asymmetrically arranged with respect to each other so that the axes of symmetry of each shell of each pair of spaced permanent-magnet shells intersect at an angle (α) equal to half the pitch angle of adjacent ones of said spaced winding slots of said rotor armature.
References Cited (Backward Citations)
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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) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |