US4140935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
D-C dynamo electric machine
Assignee: Robert Bosch GmbH
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Filing: 1977-01-13
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Granted: 1979-02-20
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Expires: 1997-01-13
Abstract
Abstract To improve commutation and, particularly, to suppress commutator sparking and arc-over or flash-over, an auxiliary yoke is placed between the main poles and the auxiliary or commutating poles of a salient pole machine, the auxiliary yoke being formed of stacked lamellae, preferably with an adjustable air gap. Adjustability can be obtained by forming the auxiliary yoke with two interengaging sections, one of which is movable with respect to the other, so that commutation at the specific poles can be adjusted by adjusting the air gap of the auxiliary yoke.
Inventors
- 👤 Herbert Braun
- 👤 Paul Rauschenberger
- 👤 Anton Tosch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:39
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
D-C dynamo electric machine having a field magnet structure comprising a main yoke structure (10); main poles (11-14) secured to the yoke structure; auxiliary poles (15-18) secured to the yoke structure; auxiliary yoke elements (27-34) comprising a stack of auxiliary yoke laminations secured to the main yoke structure (10) and extending between the main poles (11-14) and the auxiliary poles (15-18); and an air gap (d 1 ) of adjustable width in the auxiliary yoke elements between an auxiliary pole (15-18) and an adjacent main pole (11-14).
Claim 2
Dependent Claim
87 words
D-C dynamo electric machine having a field magnet structure comprising a main yoke structure (10); main poles (11-14) secured to the yoke structure; auxiliary poles (15-18) secured to the yoke structure; auxiliary yoke elements (27-34) comprising a stack of auxiliary yoke laminations secured to the main yoke structure (10) and extending between the main poles (11-14) and the auxiliary poles (15-18); and an air gap (d 1 ) of adjustable width in the auxiliary yoke elements between an auxiliary pole (15-18) and an adjacent main pole (11-14).
Claim 3
Dependent Claim
32 words
Machine according to claim 1, wherein the yoke structure is an essentially cylindrical structure and the lamellae of the auxiliary yoke elements are located at the inside of the cylindrical yoke structure.
Claim 4
Dependent Claim
19 words
Machine according to claim 1, wherein the auxiliary yoke elements comprise mutually adjustable yoke element portions including overlapping lamellae.
Claim 5
Dependent Claim
39 words
Machine according to claim 3, wherein one yoke portion (270) of an auxiliary yoke is fixedly secured to the main yoke structure (10) and the other yoke portion (271) is slidable with respect to the main yoke structure (10).
Claim 6
Dependent Claim
26 words
Machine according to claim 4, further comprising means (38, 39) adjustably securing the slidable auxiliary yoke portion (271) with respect to the main yoke stucture (10).
Claim 7
Dependent Claim
23 words
Machine according to claim 5, wherein the adjustable securing means comprises an eccenter (39) and clamp means (38) clamping the eccenter in position.
Claim 8
Dependent Claim
24 words
Machine according to claim 6, further comprising an adjustment positioning indicating means to set the eccentricity of the eccenter and provide an indication thereof.
Claim 9
Dependent Claim
27 words
Machine according to claim 6, wherein said eccenter is formed with an accessible bore therethrough, and the clamp means comprises a bolt (38) passing through said bore.
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) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |