Patent US3832583A successfully refreshed from Google Patents.
US3832583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Squirrel cage motor with improved rotor bar securing arrangement
Assignee: Westinghouse Electric Corp
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Filing: 1973-03-08
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Granted: 1974-08-27
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Expires: 1993-03-08
Abstract
Abstract A squirrel cage motor has its rotor bars located in core slots with indentations in the slot walls into which material of the bars is forced, such as by swaging, in order to restrain the bars from vibration in use.
Inventors
- 👤 C Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:26
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/02; H02K15/021; H02K15/023; H02K15/20; H02K15/22; H02K17/00; H02K17/02; H02K17/16; H02K17/20; H02K3/00; H02K3/46; H02K3/48
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
A dynamoelectric machine of the squirrel cage type comprising: a stator; a rotor located concentrically within said stator, said rotor comprising a magnetic core that includes a plurality of stacked laminations, said core having a plurality of slots extending therein from the rotor surface and extending longitudinally from end to end of said core, and a rotor bar of conductive material located in each of said slots, said slots, each having a substantially rectangular portion having two inner surfaces extending substantially radially in said core and each having at least one indentation, material of each of said bars being intimately disposed in said at least one indentation for securing said bars from vibration while portions of said bars removed from said at least one indentation are free of intimate engagement with said surfaces.
Claim 2
Dependent Claim
133 words
A dynamoelectric machine of the squirrel cage type comprising: a stator; a rotor located concentrically within said stator, said rotor comprising a magnetic core that includes a plurality of stacked laminations, said core having a plurality of slots extending therein from the rotor surface and extending longitudinally from end to end of said core, and a rotor bar of conductive material located in each of said slots, said slots, each having a substantially rectangular portion having two inner surfaces extending substantially radially in said core and each having at least one indentation, material of each of said bars being intimately disposed in said at least one indentation for securing said bars from vibration while portions of said bars removed from said at least one indentation are free of intimate engagement with said surfaces.
Claim 3
Dependent Claim
28 words
The subject matter of claim 1 wherein: said at least one indentation comprises at least one longitudinally extending groove in each of said inner surfaces of said slots.
Claim 4
Dependent Claim
24 words
The subject matter of claim 1 wherein: said at least one indentation is located in said surfaces within the radially outwardly top half thereof.
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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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |