US4485320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welded stator using non-magnetic bars in specially shaped lamination slots
Assignee: Fanuc Corp
•
Filing: 1982-09-08
•
Granted: 1984-11-27
•
Expires: 2002-09-08
Abstract
Abstract A stator of an electric motor comprises a laminated iron-core (1) having dovetail grooves, end plates (2) and steel bars (3) which are accommodated in the dovetail grooves and have a trapezoidal shape in cross-section. The steel bars (3) are arc-welded to the laminated iron-core (1) and to the end plates (2).
Inventors
- 👤 Shigeki Kawada
- 👤 Shigeaki Oyama
- 👤 Kousei Nakamura
- 👤 Jiro Nakano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:35
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
93 words
A stator comprising a laminated iron-core with windings, end plates, and a frame formed on the outer periphery of the laminated iron-core, characterized in that said frame comprises steel bars made of a non-magnetic steel and having a trapezoidal shape in cross-section; dovetail grooves which accomodate the steel bars, are formed in said laminated iron-core and edges of said laminated iron-core at said dovetail grooves are beveled to form V-grooves between said laminated iron-core and said steel bars, and said steel bars are welded to said laminated iron-core and to said end plates.
Claim 2
Dependent Claim
93 words
A stator comprising a laminated iron-core with windings, end plates, and a frame formed on the outer periphery of the laminated iron-core, characterized in that said frame comprises steel bars made of a non-magnetic steel and having a trapezoidal shape in cross-section; dovetail grooves which accomodate the steel bars, are formed in said laminated iron-core and edges of said laminated iron-core at said dovetail grooves are beveled to form V-grooves between said laminated iron-core and said steel bars, and said steel bars are welded to said laminated iron-core and to said end plates.
Claim 3
Dependent Claim
16 words
A stator according to claim 1, characterized in that said trapezoidal shape is an equilateral trapezoid.
References Cited (Backward Citations)
US2393065A
Cited
US2610225A
Cited
US2556013A
Cited
US2790918A
Cited
US2961556A
Cited
US3533867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |