US4433474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amorphous magnetic core and process for manufacturing to improve efficiency
Assignee: Electric Power Research Institute
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Filing: 1981-10-08
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Granted: 1984-02-28
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Expires: 2001-10-08
Abstract
Abstract A magnetic core with reduced losses is provided along with a related improvement in the process for fabricating magnetic cores for electromagnetic devices from strips of amorphous magnetic alloys. Magnetic powder, or magnetic powder mixed with a suitable carrier, is applied to the core for filling gaps occurring between the layers of the amorphous strips.
Inventors
- 👤 Naim Hemmat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:56
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0206; H01F41/0213; H01F41/0226; H01F3/00; H01F3/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
49 words
In a method for winding magnetic cores for electromagnetic devices including the step of winding a strip of magnetic material in layers to form the core, the improvement comprising the step of filling interstitial gaps between successive layers of said magnetic material with a filler of magnetically permeable powder.
Claim 2
Dependent Claim
49 words
In a method for winding magnetic cores for electromagnetic devices including the step of winding a strip of magnetic material in layers to form the core, the improvement comprising the step of filling interstitial gaps between successive layers of said magnetic material with a filler of magnetically permeable powder.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein said filling step includes the step of dispensing said powder on said strip prior to said winding step.
Claim 4
Dependent Claim
27 words
The method of claim 1 wherein said filling step includes the steps of mixing said powder with a carrier, and dispensing the mixture to contact said strip.
Claim 5
Dependent Claim
44 words
The method of claim 3 wherein said dispensing step includes the step of depositing said mixture on said strip prior to the winding step, said dispensing step being followed by the step of winding the coated strip to form a layer of magnetic material.
Claim 6
Dependent Claim
27 words
The method of claim 4 further comprising the step of embedding the mixture into the intestitial gaps by compressing each subsequent layer against the previously wound layer.
Claim 7
Independent Claim
48 words
A method for winding magnetic cores for electromagnetic devices including the steps of: winding a a strip of amorphous metal alloy into a plurality of layers of said core, and filling intestitial gaps between succeeding layers of said amorphous metal alloy with material having magnetic properties similar thereto.
Claim 8
Independent Claim
48 words
A method for winding magnetic cores for electromagnetic devices including the steps of: winding a a strip of amorphous metal alloy into a plurality of layers of said core, and filling intestitial gaps between succeeding layers of said amorphous metal alloy with material having magnetic properties similar thereto.
Claim 9
Dependent Claim
33 words
The method of claim 6 wherein said filling step includes the steps of mixing magnetic powder with a carrier and dispensing the mixture to contact a previously wound layer of amorphous magnetic alloy.
Claim 10
Dependent Claim
22 words
The method of claim 7 wherein said powder is formed of substantially the same composition as said strip of amorphous metal alloy.
Claim 11
Dependent Claim
24 words
The method of claim 7 wherein a magnetic field is applied to said strip to assist in retention and alignment of the magnetic powder.
References Cited (Backward Citations)
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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) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |