US4467232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct-current machine
Assignee: Alcatel Lucent NV
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Filing: 1983-05-09
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Granted: 1984-08-21
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Expires: 2003-05-09
Abstract
Abstract A DC machine (motor, etc.) with permanent field magnets arranged in the stator frame and designed as shells. The shell of each pole structure consists of two or more annular segments arranged one behind the other in the axial direction and staggered with respect to one another in the circumferential direction. The staggered arrangement reduces the excitation flux area between the poles and, thus, diminishes the detent torque of the rotor.
Inventors
- 👤 Winfried Eichhorn
- 👤 Kurt Eclercy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:37
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/02; H02K23/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
164 words
A fixed stator structure for a direct-current machine having permanent-magnet field stator elements, comprising: a generally cylindrical stator frame; first means comprising a first plurality of equal sized, generally annular, cylindrical permanent-magnet segments arranged to form a first group of permanent-magnet stator members, said first plurality of stator members being arranged in axial juxtaposition and offset circumferentially with respect to each other by an amount small compared to the diameter of said cylindrical stator frame; second means comprising a second plurality of cylindrical permanent-magnet segments offset and arranged as in said first means, said second means segments being fixed in said stator frame diametrically opposite said first means segments, said offsets of each of said first and second pluralities of segments being arranged to provide a substantially constant circumferential clearance between said segments of said first and second pluralities of segments, the amount of said clearance being greater than the amount of said offset, but small compared to the diameter of said stator frame.
Claim 2
Dependent Claim
164 words
A fixed stator structure for a direct-current machine having permanent-magnet field stator elements, comprising: a generally cylindrical stator frame; first means comprising a first plurality of equal sized, generally annular, cylindrical permanent-magnet segments arranged to form a first group of permanent-magnet stator members, said first plurality of stator members being arranged in axial juxtaposition and offset circumferentially with respect to each other by an amount small compared to the diameter of said cylindrical stator frame; second means comprising a second plurality of cylindrical permanent-magnet segments offset and arranged as in said first means, said second means segments being fixed in said stator frame diametrically opposite said first means segments, said offsets of each of said first and second pluralities of segments being arranged to provide a substantially constant circumferential clearance between said segments of said first and second pluralities of segments, the amount of said clearance being greater than the amount of said offset, but small compared to the diameter of said stator frame.
Claim 3
Dependent Claim
21 words
Apparatus according to claim 1 further defined in that said plurality of segments of said first and second means is two.
Claim 4
Dependent Claim
17 words
Apparatus according to claim 1 further defined in that said plurality of segments is at least three.
Claim 5
Dependent Claim
33 words
Apparatus according to claim 3 in which said cylindrical segments of said first and second pluralities are offset in alternate steps, said clearance remaining constant over the axial extent of said segment pluralities.
Claim 6
Dependent Claim
33 words
Apparatus according to claim 3 in which said cylindrical segments of said first and second pluralities are offset in progressive steps, said clearance remaining constant over the axial extent of said segment pluralities.
References Cited (Backward Citations)
US4110649A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |