US3742267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan arrangement having automatic control capability
Assignee: Ebm Papst St Georgen GmbH and Co KG
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Filing: 1970-09-23
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Granted: 1973-06-26
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Expires: 1990-09-23
Abstract
Abstract A fan arrangement with a motor for rotating the impeller thereof. A signal generator for producing an electrical signal in accordance with the rotational speed of the impeller. The generator including a stationary claim-pole unit with a pickup member. The rotor including a multi-pole permanently magnetized ring positioned outwardly of the claw-pole unit has been inserted.
Inventors
- 👤 G Papst
- 👤 H Papst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:29
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/488; G01R; G01R31/00; G01R31/34; G01R31/343; H; H02; H02K; H02K7/00; H02K7/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
A fan arrangement having automatic control capability comprising rotatable impeller means; motor means for rotating said impeller means and including external rotor means; and signal-generating means for generating an electrical signal which is a function of and indicative of the rotational speed of said impeller means, said signal-generating means comprising a stationary claw pole unit including pick-up winding means, and a multi-pole permanently magnetized ring comprising a flexible permanently magnet strip radially outwardly of said claw-pole unit and being mounted on and rotatable with said rotor means relative to said claw pole unit.
Claim 2
Dependent Claim
93 words
A fan arrangement having automatic control capability comprising rotatable impeller means; motor means for rotating said impeller means and including external rotor means; and signal-generating means for generating an electrical signal which is a function of and indicative of the rotational speed of said impeller means, said signal-generating means comprising a stationary claw pole unit including pick-up winding means, and a multi-pole permanently magnetized ring comprising a flexible permanently magnet strip radially outwardly of said claw-pole unit and being mounted on and rotatable with said rotor means relative to said claw pole unit.
Claim 3
Dependent Claim
25 words
A fan arrangement as defined in claim 1, said external rotor means comprising an annular ferromagnetic member radially outwardly of and surrounding said magnetized ring.
Claim 4
Dependent Claim
21 words
A fan arrangement as defined in claim 2, said claw pole unit comprising a plurality of radially outwardly projecting claw portions.
Claim 5
Dependent Claim
53 words
A fan arrangement as defined in claim 2, said claw pole unit comprising first and second groups of axially spaced peripherally offset radially outwardly projecting claw portions together defining a circumferential recess, and said pick-up winding means comprising electricaL wire means coiled around said claw pole unit and accommodated in said circumferential recess.
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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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |