Russell Tompkins

US Patent:

43452299, Aug 17, 1982

Filed:

Mar 2, 1981

Appl. No.:

6/239753

Inventors:

Robert P. Alley - Manlius NY
Russell E. Tompkins - Scotia NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01F 2724

US Classification:

336 83

Abstract:

A lamp ballast has a pair of adjacent gapped "O" magnetic cores made of nested, almost complete loops of amorphous metal strip with the gaps in the loops shaped and arranged under the secondary coil to simulate any type of restricted cross section for shaping the lamp current. A long slender reactor has a similar configuration in which the gaps are staggered; a different embodiment has a long central core of compressed amorphous metal flake and a helical overwrap of ribbon. An alloy of iron, boron, and silicon with a high B. sub. r /B. sub. s ratio is preferred for these inductive devices.

US Patent:

42119570, Jul 8, 1980

Filed:

Jan 31, 1979

Appl. No.:

6/007918

Inventors:

Robert P. Alley - Manlius NY
Theodore R. Haller - Schenectady NY
Russell E. Tompkins - Scotia NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

H05B 4116

US Classification:

315276

Abstract:

The magnetic core of a lamp ballast is bifilar wound from inherently thin amorphous metal strip and utilizes the laminations of the magnetic circuit as the plates of a capacitor. The outer yoke of the core encases the coils and is edge-wound from amorphous metal ribbon alternated with insulation to also be the power factor capacitor. The inner core is accordion-pleated or spirally wound and is electrically connected to be the starting capacitor. Cutaways in the inner core cause saturation and shape the lamp current waveform.

US Patent:

42887739, Sep 8, 1981

Filed:

Dec 6, 1978

Appl. No.:

5/966855

Inventors:

Robert P. Alley - Manlius NY
Russell E. Tompkins - Scotia NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01F 1706
H01F 7108
H01F 7724

US Classification:

336160

Abstract:

A lamp ballast has a pair of adjacent gapped "O" magnetic cores made of nested, almost complete loops of amorphous metal strip with the gaps in the loops shaped and arranged under the secondary coil to simulate any type of restricted cross section for shaping the lamp current. A long slender reactor has a similar configuration in which the gaps are staggered; a different embodiment has a long central core of compressed amorphous metal flake and a helical overwrap of ribbon. An alloy of iron, boron, and silicon with a high B. sub. r /B. sub. s ratio is preferred for these inductive devices.