US4198743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming a magnetic core for a linear compressor
Assignee: Tecumseh Products Co
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Filing: 1978-07-14
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Granted: 1980-04-22
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Expires: 1998-07-14
Abstract
Abstract A method for forming a magnetic core for the magnetic circuit of a linear-motor compressor suitable for use in a refrigerant system. The compressor includes a conical armature which reciprocates in a complementary air-gap under the influence of an electromagnetic circuit and a pair of linear complementary return springs connected to the armature between the compressor piston and outboard bearing. The electromagnetic circuit includes a pair of abutting convoluted loops of spirally wound magnetic strip material with a conical air-gap fabricated in the area of abutment. The magnetic core is formed by forming a pair of stacks of magnetic strips having diverse lengths, bending each stack to form a generally C-shaped core section having a generally semi-circular air-gap space defined by the ends of the strips, fastening the C-shaped stacks in opposed abutment to form a generally cylindrical air-gap, and then machining the air-gap into the desired conical shape.
Inventors
- 👤 Richard A. Stuber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:35
CPC Classifications
F; F04; F04B; F04B35/00; F04B35/04; F04B35/045; H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/14; H02K1/141; H02K1/146; H02K15/00; H02K15/02; H02K15/021; H02K15/022; H02K33/00; H02K33/02; H02K33/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/4902; Y10T29/49071; Y10T29/49075; Y10T29/49078
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
190 words
A method of making a magnetic core for a reciprocating electric motor comprising the steps of: stacking a plurality of strips of magnetic material wherein the respective strips are of diverse lengths and are stacked such that the strips are in order of decreasing length, in a first direction, bending the stack of strips in said first direction around the shortest length strip to a generally C-sahped configuration, stacking a second plurality of strips of magnetic material wherein the strips are of diverse lengths and are stacked such that they are in order of decreasing lengths in a second direction, bending the second mentioned stack of strips in said second direction into a generally C-shaped configuration around the shortest length strip thereof, each of said C-shaped stacks having an air-gap space defined by the end edges of the respective strips, said air-gap spaces being generally semi-circular in cross-section, positioning said first and second C-shaped stacks in flatwise abutment on a common plane such that their respective air-gap spaces are in mutually facing relationship and together form an air-gap, and fastening said C-shaped stacks tightly together in their flatwise abutment position.
Claim 2
Independent Claim
190 words
A method of making a magnetic core for a reciprocating electric motor comprising the steps of: stacking a plurality of strips of magnetic material wherein the respective strips are of diverse lengths and are stacked such that the strips are in order of decreasing length, in a first direction, bending the stack of strips in said first direction around the shortest length strip to a generally C-sahped configuration, stacking a second plurality of strips of magnetic material wherein the strips are of diverse lengths and are stacked such that they are in order of decreasing lengths in a second direction, bending the second mentioned stack of strips in said second direction into a generally C-shaped configuration around the shortest length strip thereof, each of said C-shaped stacks having an air-gap space defined by the end edges of the respective strips, said air-gap spaces being generally semi-circular in cross-section, positioning said first and second C-shaped stacks in flatwise abutment on a common plane such that their respective air-gap spaces are in mutually facing relationship and together form an air-gap, and fastening said C-shaped stacks tightly together in their flatwise abutment position.
Claim 3
Dependent Claim
38 words
The method set forth in claim 1 wherein said air-gap formed by said facing air-gap spaces is generally cylindrical in shape, and including the step of machining said air-gap to form said cylindrical air-gap into a conical shape.
Claim 4
Dependent Claim
25 words
The method set forth in claim 1 wherein said stacks of strips are bent around an oblong mandrel during their formation into said C-shaped configuration.
Claim 5
Dependent Claim
29 words
The method set forth in claim 1 including clamping said C-shaped stacks together in a fixture to position them in said flatwise abutment, and then welding said stacks together.
Claim 6
Dependent Claim
22 words
The method set forth in claim 4 wherein said C-shaped stacks are strip welded so as to prevent them from straightening out.
Claim 7
Dependent Claim
16 words
The method set forth in claim 1 including the step of stress relieving said C-shaped stacks.
Claim 8
Dependent Claim
30 words
The method set forth in claim 1 wherein said air-gap formed by said facing air-gaped spaces is generally circular in cross-section on a plane perpendicular to the axis of reciprocation.
References Cited (Backward Citations)
FR841351A
Cited
US2906977A
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US2968087A
Cited
US3542495A
Cited
FR1574145A
Cited
US3955272A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-22 | 1983-10-22 | 1984-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-22 | 1987-10-22 | 1988-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-22 | 1991-10-22 | 1992-04-22 | $7700.00 | Window Closed / Lapsed |