Patent US3899702A successfully refreshed from Google Patents.
US3899702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torquer armature
Assignee: Kearfott Guidance and Navigation Corp
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Filing: 1971-12-09
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Granted: 1975-08-12
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Expires: 1991-12-09
Abstract
Abstract A D.C. torquer includes a magnet ring having a longitudinal axis, an armature ring rotatable relative to the magnet ring about the axis, and a commutator ring disposed coaxially with the armature ring and the magnet ring. The magnet ring has a plurality of magnetized poles peripherally spaced about the axis, and has a pair of brushes for engaging the commutator ring. The armature ring has a plurality of coil-wound poles peripherally spaced about the axis, and has a plurality of slots disposed between the poles. The armature poles are separated from the magnet poles by a substantially constant radial gap. The commutator ring is mounted on the armature ring. The armature ring has a ring-shaped web portion and has a ring-shaped flange portion. The armature flange portion has an axial width which is substantially greater than the armature web portion axial width. The magnet ring has an axial width which is approximately equal to the armature flange portion axial width. With this structure and arrangement, the ratio of the magnetic volume of the torquer to the torquer output is minimized.
Inventors
- 👤 Samuel C Hanna
- 👤 Walter J Krupick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:59
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/02; H02K23/04; H02K1/00; H02K1/06; H02K1/22; H02K1/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
267 words
A D.C. torquer comprising: a permanent magnet ring having a longitudinal axis and having a plurality of magnetized poles peripherally spaced about said axis, a pair of brushes mounted on said magnetic ring; a one-piece armature ring rotatable relative to said magnet ring about said axis and having a plurality of coils mounted thereon defining a corrEsponding plurality of coil-wound poles peripherally spaced about said axis, said armature ring having a plurality of slots disposed between said poles, said armature poles being separated from said magnet poles by a substantially constant gap; and a commutator ring mounted on said armature ring and disposed coaxially with said armature ring and said magnet ring to be contacted by said brushes, wherein: said armature ring has a ring-shaped web portion and a ringshaped flange portion, said armature web portion and said armature flange portion having selected axial widths, said armature flange portion axial width being substantially greater than said armature web portion axial width; said magnet ring has a selected axial width substantially greater than said armature web portion axial width and approximately equal to said armature flange portion axial width; said armature flange portion has axially opposite projecting portions extending beyond said web portion and having respective axial widths of substantially equal size, said axial width of each flange projecting portion being not greater than 0.4 times the overall armature flange portion axial width; each said armature coil has a coil portion projecting axially beyond the face of said armature web portion; and each said armature flange projecting portion extends axially beyond said armature coil portion disposed adjacent thereto.
Claim 2
Dependent Claim
267 words
A D.C. torquer comprising: a permanent magnet ring having a longitudinal axis and having a plurality of magnetized poles peripherally spaced about said axis, a pair of brushes mounted on said magnetic ring; a one-piece armature ring rotatable relative to said magnet ring about said axis and having a plurality of coils mounted thereon defining a corrEsponding plurality of coil-wound poles peripherally spaced about said axis, said armature ring having a plurality of slots disposed between said poles, said armature poles being separated from said magnet poles by a substantially constant gap; and a commutator ring mounted on said armature ring and disposed coaxially with said armature ring and said magnet ring to be contacted by said brushes, wherein: said armature ring has a ring-shaped web portion and a ringshaped flange portion, said armature web portion and said armature flange portion having selected axial widths, said armature flange portion axial width being substantially greater than said armature web portion axial width; said magnet ring has a selected axial width substantially greater than said armature web portion axial width and approximately equal to said armature flange portion axial width; said armature flange portion has axially opposite projecting portions extending beyond said web portion and having respective axial widths of substantially equal size, said axial width of each flange projecting portion being not greater than 0.4 times the overall armature flange portion axial width; each said armature coil has a coil portion projecting axially beyond the face of said armature web portion; and each said armature flange projecting portion extends axially beyond said armature coil portion disposed adjacent thereto.
Claim 3
Dependent Claim
78 words
The D.C. torquer as claimed in claim 1, wherein each said flange projecting portion has a flange thickness of approximately equal size and smaller in dimension than said flange projecting portion axial width, wherein the ratio of armature ring flange thickness to flange projecting portion axial width is selected so that the saturation in the armature ring flange caused by the magnet ring is slightly less than the maximum saturation level of the material of the armature ring.
Claim 4
Dependent Claim
46 words
The D.C. torquer as claimed in claim 2, wherein said armature slots have respective radial depths of substantially equal size, the radial depth of each said slot being slightly smaller in dimension than the radial dimension of said armature ring minus said armature ring flange thickness.
Claim 5
Dependent Claim
92 words
The D.C. torquer as claimed in claim 3, wherein each said armature slot has a slot width measured in a peripheral direction at the radially outer edge thereof, said armature slot widths being of substantially equal size, each said pair of armature slots forming one said armature tooth therebetween, each said armature tooth having a tooth thickness measured in a peripheral direction at the radially outer edge thereof, said slot width measuring between 0.2 and 0.5 times said slot depth, said tooth thickness measuring between 0.2 and 0.8 times said slot width.
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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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |