Kuhlman Corporation

Joe E Curtis, Jr

John L Fisher

Clair E Piatt

John E Cloyd

Herbert J Macemon

James D Richerson

Richard W Martin

Thomas H Aishton

Hubert L Mohney

James F Rafferty

Richard W Wiedo

Douglas Burns

J Richard McClelland

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. Accordingly, no edge guides are used along the path of the core material from the supply spool to the entrance gap.

Method and apparatus for winding an amorphous magnetic toroidal

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.

Apparatus and method for winding a strip of material into an arcuate

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.

Toroidal electrical transformer and method of producing same

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.

Apparatus and method for winding a toroidal magnetic core onto a bobbin

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.

Apparatus and method for winding a magnetic core for toroidal transformer

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.

Growing community of inventors

Lexington, KY, United States of America

Joe E Curtis, Jr