US3814960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
External rotor-type electric motor
Assignee: Ebm Papst St Georgen GmbH and Co KG
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Filing: 1973-01-31
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Granted: 1974-06-04
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Expires: 1993-01-31
Abstract
Abstract In an external rotor-type electric motor having a flange for mounting against a wall, wherein the flow of cooling air to the stator winding would ordinarily be obstructed by the wall and flange, centrifugal impeller air ducts on the rotor end draw in cooling air to one end of the stator winding through ducts extending inwardly through the flange.
Inventors
- 👤 M Burgbacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:12
CPC Classifications
H; H02; H02K; H02K5/00; H02K9/00; H02K9/02; H02K9/04; H02K9/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
182 words
An external rotor-type electric motor, comprising: a mounting flange adapted to be secured against a wall, bearing means connected to said mounting flange and extending outwardly therefrom, a stator surrounding said bearing means and affixed thereto, said stator having a winding thereon with turns at one end thereof disposed towards said mounting flange, a shaft rotatably supported in said bearing means, a generally bell-shape rotor having one end affixed to said shaft remotely from said mounting flange, said rotor encompassing said stator and having the other relatively large free end disposed towards and sapcEd from said mounting flange, said rotor having centrifugal impeller ducts disposed around the free end thereof radially outward of said coil turns, and air duct means within the mounting flange providing air flow from the exterior of said flange to said turns of said stator winding, said mounting flange having an outer peripheral portion, said air duct means having outer end portions extending radially inward through the outer peripheral portion and inner end portions curving in the axial direction of the shaft towards said stator winding end turns.
Claim 2
Dependent Claim
182 words
An external rotor-type electric motor, comprising: a mounting flange adapted to be secured against a wall, bearing means connected to said mounting flange and extending outwardly therefrom, a stator surrounding said bearing means and affixed thereto, said stator having a winding thereon with turns at one end thereof disposed towards said mounting flange, a shaft rotatably supported in said bearing means, a generally bell-shape rotor having one end affixed to said shaft remotely from said mounting flange, said rotor encompassing said stator and having the other relatively large free end disposed towards and sapcEd from said mounting flange, said rotor having centrifugal impeller ducts disposed around the free end thereof radially outward of said coil turns, and air duct means within the mounting flange providing air flow from the exterior of said flange to said turns of said stator winding, said mounting flange having an outer peripheral portion, said air duct means having outer end portions extending radially inward through the outer peripheral portion and inner end portions curving in the axial direction of the shaft towards said stator winding end turns.
Claim 3
Dependent Claim
31 words
An external rotor-type electric motor as claimed in claim 1, said air duct means decreasing in cross-section from the outer extremities thereof to inner extremities of the inner end portions thereof.
Claim 4
Dependent Claim
21 words
An external rotor-type electric motor as recited in claim 1, the decrease in cross-section of said air duct means being continuous.
Claim 5
Dependent Claim
30 words
An external rotor-type electric motor as claimed in claim 1, the inner extremities of the inner end portion of said air duct means terminating generally axially opposite said coil turns.
Claim 6
Dependent Claim
24 words
An external rotor-type electric motor as claimed in claim 1, characterized in that the mounting flange consists of light metal, preferably light metal casting.
Claim 7
Dependent Claim
36 words
An external rotor-type electric motor as claimed in claim 5, characterized in that the tube has, on the end thereof which is connected to the mounting flange, an auxiliary flange embedded in the mounting flange casting.
Claim 8
Dependent Claim
25 words
An external rotor-type electric motor as claimed in claim 1, characterized in that the mounting flange is airtight other than for said air passage means.
Claim 9
Dependent Claim
24 words
An external rotor-type electric motor as claimed in claim 1, characterized in that the free end thereof is closely spaced from the mounting flange.
References Cited (Backward Citations)
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Cited
US3032666A
Cited
US3050647A
Cited
US3150276A
Cited
US3148294A
Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |