US3826940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor construction for squirrel cage motor
Assignee: Allis Chalmers Corp
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Filing: 1973-03-22
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Granted: 1974-07-30
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Expires: 1993-03-22
Abstract
Abstract A squirrel cage rotor for an electric motor which includes slotted laminations and a pair of slotted end connectors at each end of the lamination stack. Conductor bars are contained in each of the slots and extend to the ends of the end connectors which also perform the function of end plates. A continuous annular groove is formed in the surface of the end connector and conductor bars and filled with a continuous weld providing a rigid rotor structure and good electrical contact between the conductor bars and the end connectors.
Inventors
- 👤 Kean J Mc
- 👤 N Steinhauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:01
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/16; H02K17/168
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
The squirrel cage rotor set forth in claim 1 wherein said groove is of uniform depth and width.
Claim 2
Dependent Claim
32 words
The squirrel cage rotor set forth in claim 1 wherein said continuous annular groove is formed in the end surface of said conductor bars and the intervening surfaces of said end connectors.
Claim 3
Dependent Claim
32 words
The squirrel cage rotor set forth in claim 1 and further comprising means located adjacent said shaft engaging said end connectors to rigidly hold said laminations and end connectors against relative movement.
Claim 4
Dependent Claim
54 words
The squirrel cage rotor set forth in claim 1 wherein said conductor bars and end connectors are constructed of material having similar electrical and magnetic characteristics and said laminations are constructed of a material having dissimilar magnetic and electrical characteristics from the magnetic and electrical characteristics of said conductor bars and said end connectors.
Claim 5
Dependent Claim
29 words
The squirrel cage rotor set forth in claim 1 wherein a plurality of said conductor bars extend beyond said end connectors to provide fan blades for cooling the rotor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |