Patent US1479663A successfully refreshed from Google Patents.
US3786353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coil forming apparatus method and galvo-motor product
Assignee: Individual
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Filing: 1972-03-30
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Granted: 1974-01-15
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Expires: 1992-03-30
Abstract
Abstract A contour molded galvo-motor coil together with the forming apparatus and the specific method of manufacture. A low inertia coil is formed which also allows a smaller air gap in the magnetic circuit of the galvo-motor. The associated improvement in galvo-motor efficiency results from the inverse square relationship between flux density and length of air gap. The formed coil is shaped as a section of a thin walled circular cylinder and impregnated with a compound during winding which when cured provides a rigid unitized coil structure. The low mass resulting from the absence of the conventional coil form and the high rigidity afforded by the coil shape and impregnation compound eliminate torsional deformation during operation and provide a galvo-motor having high efficiency and accuracy.
Inventors
- 👤 J Pun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:38
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/04; G; G01; G01R; G01R5/00; G01R5/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
214 words
A galvanometer coil constructed for use without a coil form consisting solely of at least one continuous strand of insulated electrical conductor, formed into a loop consisting of a plurality of turns of said strand of conductor with the ends thereof available for electrical connection, said loop having first and second sides adapted to be moved through a magnetic gap and third and fourth return end sides generally perpendicular to said first and second sides serving to interconnect said first and second sides, a pair of pivots mounted on said third and fourth sides to define an axis of rotation of said loop, said first and second sides of said loop being constructed in the form of corresponding opposite sections of a circular cylindrical shell of uniform thickness with a radius of curvature center on said pivot axis, and uncured impregnation compound applied to said insulated electrical conductor immediately prior to formation of said loop and subsequently cured to form said loop into a unitary self supporting structure, whereby torsional deformation about the axis of rotation of said loop due to inertial resistance of the mass thereof is reduced to very low values by the low mass of said loop structure and the strength provided by the cylindrical shell structure of the sides thereof.
Claim 2
Dependent Claim
214 words
A galvanometer coil constructed for use without a coil form consisting solely of at least one continuous strand of insulated electrical conductor, formed into a loop consisting of a plurality of turns of said strand of conductor with the ends thereof available for electrical connection, said loop having first and second sides adapted to be moved through a magnetic gap and third and fourth return end sides generally perpendicular to said first and second sides serving to interconnect said first and second sides, a pair of pivots mounted on said third and fourth sides to define an axis of rotation of said loop, said first and second sides of said loop being constructed in the form of corresponding opposite sections of a circular cylindrical shell of uniform thickness with a radius of curvature center on said pivot axis, and uncured impregnation compound applied to said insulated electrical conductor immediately prior to formation of said loop and subsequently cured to form said loop into a unitary self supporting structure, whereby torsional deformation about the axis of rotation of said loop due to inertial resistance of the mass thereof is reduced to very low values by the low mass of said loop structure and the strength provided by the cylindrical shell structure of the sides thereof.
Claim 3
Dependent Claim
136 words
In a galvo-motor, a magnetic circuit, means forming a pair of pole pieces of magnetic material in said magnetic circuit having circular cylindrical concave faces positioned so that the radii of curvature of the concave faces have a common center line, a contour molded coil of electrical conductor having coil sides in the shape of corresponding opposite sections of a circular cylindrical shell of uniform thickness disposed on a radius of curvature centered on said common center line but shorter than that of the concave faces on the pole pieces and positioned adjacent to the pole pieces, coil ends connecting said coil sides forming a generally rectangular coil, pivots mounted on said coil ends on the common center line, whereby said coil is free to rotate about the common center line past said pole piece faces.
Claim 4
Dependent Claim
136 words
In a galvo-motor, a magnetic circuit, means forming a pair of pole pieces of magnetic material in said magnetic circuit having circular cylindrical concave faces positioned so that the radii of curvature of the concave faces have a common center line, a contour molded coil of electrical conductor having coil sides in the shape of corresponding opposite sections of a circular cylindrical shell of uniform thickness disposed on a radius of curvature centered on said common center line but shorter than that of the concave faces on the pole pieces and positioned adjacent to the pole pieces, coil ends connecting said coil sides forming a generally rectangular coil, pivots mounted on said coil ends on the common center line, whereby said coil is free to rotate about the common center line past said pole piece faces.
Claim 5
Dependent Claim
94 words
A galvo-motor as in claim 1 further including a core of magnetic conductive material with convex faces describinG the surface of a circular cylinder having a radius of curvature with a center on said common center line but shorter than the radius of curvature of said contour molded coil sides, said convex faces positioned opposite the concave faces of the pole pieces, whereby a narrow circular cylindrical gap is formed between the pole pieces and the core in which said contour molded coil is disposed substantially filling said gap and free to rotate therein.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |