Joe E Curtis

US Patent:

50168320, May 21, 1991

Filed:

May 30, 1990

Appl. No.:

7/533960

Inventors:

Joe E. Curtis - Lexington KY
Douglas Burns - Lexington KY
John E. Cloyd - Versailles KY

Assignee:

Kuhlman Corporation - Lexington KY

International Classification:

B65H 1930
B65H 2310
H02K 1504

US Classification:

242 586

Abstract:

A continuous ribbon of annealed amorphous magnetic core material (4) is removed from a supply spool (14) and wound into an annular cavity (6) defined by a rotating bobbin (8) within a partially assembled toroidal transformer (10). An appropriate tension on the material entering the annular cavity is created by providing a magnet (35) along a guide surface (20) between the supply spool and the annular cavity to create a drag force on the material. Slack in the material between the guide surface and the entrance gap is eliminated by lightly biasing (40) a portion of the guide surface against the core material. The amorphous magnetic core material is preferably subjected to a stress relief annealing operation in the same spiral orientation and with the same inner and outer diameters as the material will assume as the core of the toroidal transformer. To accomplish this the annealed core material is backwound from its annealing spool (44) onto the supply spool and then is wound into the bobbin. The annealing process makes the thin amorphous material quite brittle so that extra care must be taken to keep from damaging the edges.

US Patent:

47414847, May 3, 1988

Filed:

Feb 6, 1987

Appl. No.:

7/011454

Inventors:

Joe E. Curtis - Lexington KY
Clair E. Piatt - Bronson MI
John L. Fisher - Lexington KY
John E. Cloyd - Versailles KY

Assignee:

Kuhlman Corporation - Troy MI

International Classification:

H01F 4102
H02K 1504
B65H 8102

US Classification:

242703

Abstract:

A toroidal elecrical transformer having a low voltage coil, a high voltage coil and an annular magnetic core is disclosed. The preferred low voltage and high voltage coils are each continuous and form an arcuate elongated passage therethrough. The preferred annular magnetic core is wound in place in said arcuate elongated passage substantially from a continuous strip of magnetic material resulting in a toroidal transformer with continuous windings and a continuous wound core. Various components and sub-assemblies are also disclosed along with various apparatus and methods for producing such toroidal electrical transformers, its components and its sub-assemblies.

US Patent:

48968390, Jan 30, 1990

Filed:

Apr 11, 1988

Appl. No.:

7/146881

Inventors:

Joe E. Curtis - Lexington KY
Clair E. Piatt - Bronson MI
John L. Fisher - Lexington KY
John E. Cloyd - Versailles KY

Assignee:

Kuhlman Corporation - Birmingham MI

International Classification:

B65H 8100

US Classification:

242 702

Abstract:

A toroidal electrical transformer having a low voltage coil, a high voltage coil and an annular magnetic core is disclosed. The preferred low voltage and high voltage coils are each continuous and form an arcuate elongated passage therethrough. The preferred annular magnetic core is wound in place in said arcuate elongated passage substantially from a continuous strip of magnetic material resulting in a toroidal transformer with continuous windings and a continuous wound core. Various components and sub-assemblies are also disclosed along with various apparatus and methods for producing such toroidal electrical transformers, its components and its sub-assemblies.

US Patent:

44941021, Jan 15, 1985

Filed:

Aug 31, 1982

Appl. No.:

6/413288

Inventors:

John L. Fisher - Lexington KY
Joe E. Curtis - Lexington KY

Assignee:

Kuhlman Corporation - Troy MI

International Classification:

H01F 2724

US Classification:

336212

Abstract:

An improved magnetic core for an electrical transformer, and a method and apparatus for forming the core, are disclosed wherein the corners of core windows are configured to decrease the magnetic path length, thereby reducing the core losses and the amount of material necessary to construct the core. One exemplary embodiment includes a core window opening having an outer corner radii that are larger than the inner corner radii. Alternatively, the core window may have corners of a non-constant radii, with the outer corners having a more gradual or gentle curvature. These and other disclosed embodiments also enhance the ease of assembly of the transformer core and thus decrease or eliminate damage to the magnetic material during assembly.

US Patent:

47658614, Aug 23, 1988

Filed:

Feb 6, 1985

Appl. No.:

6/698982

Inventors:

Joe E. Curtis - Lexington KY
Richard W. Martin - Versailles KY
Clair E. Piatt - Bronson MI
Hubert L. R. Mohney - Bronson MI
J. Richard McClelland - Bronson MI
John L. Fisher - Lexington KY

Assignee:

Kuhlman Corporation - Troy MI

International Classification:

H01F 4108
H02K 1508

US Classification:

156457

Abstract:

A toroidal electrical transformer having a low voltage coil, a high voltage coil, and an annular magnetic core is disclosed. The preferred low voltage and high voltage coils are each fabricated in two semitoroidal sections which together form an arcuate elongated passage therethrough. Two bobbin halves are inserted into the semitoroidal sections of the low and high voltage coils and are joined to form a cylindrical bobbin within the arcuate elongated passage. The preferred annular magnetic core is wound onto the bobbin within the arcuate elongated passage substantially from a continuous strip of magnetic material resulting in a toroidal transformer with continuous windings and a continuous wound core. Various components and sub-assemblies are also disclosed along with various apparatus and methods for producing such toroidal electrical transformers, its components and its sub-assemblies.

US Patent:

47798122, Oct 25, 1988

Filed:

Jan 15, 1987

Appl. No.:

7/005326

Inventors:

John L. Fisher - Lexington KY
Herbert J. Macemon - Versailles KY
James D. Richerson - Versailles KY
Richard W. Wiedo - Frankfort KY
Joe E. Curtis - Lexington KY
James F. Rafferty - Fairview Park OH
Thomas H. Aishton - Whitehall OH

Assignee:

Kuhlman Corporation - Troy MI

International Classification:

H01F 304

US Classification:

242 707

Abstract:

A toroidal electrical transformer having a low voltage coil, a high voltage coil and an annular magnetic core is disclosed. The preferred low voltage and high voltage coils are each continuous in substantial part over their length and form an arcuate elongated passage therethrough. The preferred annular magnetic core is wound in place in said arcuate elongated passage substantially from a continuous strip of magnetic material. Various components and sub-assemblies are also disclosed along with various apparatus and methods for producing such toroidal electrical transformer, its components and its sub-assemblies.