US4234360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making hysteresis motor rotor using amorphous magnetic alloy ribbons
Assignee: General Electric Co
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Filing: 1978-04-21
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Granted: 1980-11-18
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Expires: 1998-04-21
Abstract
Abstract A magnetic alloy is cast as an amorphous metal ribbon and wound on a rotor shaft of a hysteresis motor and then heated to crystallize the metal ribbon and greatly increase its coercive force prior to assembling the rotor with the stator of the motor.
Inventors
- 👤 Peter G. Frischmann
- 👤 Fred E. Luborsky
- 👤 Russell E. Tompkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:43
CPC Classifications
C; C21; C21D; C21D6/00; C21D1/00; C21D1/04; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15341; H02; H02K; H02K15/00; H02K15/02; H02K19/00; H02K19/02; H02K19/04; H02K19/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
141 words
The method of making a hysteresis motor rotor assembly having a predetermined hysteresis loop area, which comprises the steps of casting a magnetic alloy composition in the form of a ductile amorphous metal ribbon having a value of coercive force in the range of from about 0.01 to about 0.1 oersted, tightly winding said ductile ribbon on a rotor member, affixing the wound ribbon to said rotor member to form a rotor assembly, preselecting a value of coercive force in the range of from about 10 to about 300 oersteds to be provided to said wound ribbon, heating said rotor assembly to a preselected temperature above the crystallization temperature for said magnetic alloy composition, and maintaining said rotor assembly at said preselected temperature for a period of time at least sufficient to develop said preselected coercive force in said wound ribbon.
Claim 2
Independent Claim
141 words
The method of making a hysteresis motor rotor assembly having a predetermined hysteresis loop area, which comprises the steps of casting a magnetic alloy composition in the form of a ductile amorphous metal ribbon having a value of coercive force in the range of from about 0.01 to about 0.1 oersted, tightly winding said ductile ribbon on a rotor member, affixing the wound ribbon to said rotor member to form a rotor assembly, preselecting a value of coercive force in the range of from about 10 to about 300 oersteds to be provided to said wound ribbon, heating said rotor assembly to a preselected temperature above the crystallization temperature for said magnetic alloy composition, and maintaining said rotor assembly at said preselected temperature for a period of time at least sufficient to develop said preselected coercive force in said wound ribbon.
Claim 3
Dependent Claim
23 words
The method of claim 1 in which the composition of the amorphous metal is Fe 40 Ni 40 P 14 B 6 .
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the magnetic alloy composition is free of cobalt.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein the magnetic alloy composition is Fe 40 Ni 40 B 20 .
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein the magnetic alloy composition is Fe 80 B 20 .
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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) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |