DR. THOMAS CROSS COLEMAN, O.D.
Optometry at Germantown Pkwy, Cordova, TN

License number

Tennessee 2257

Professional information

Thomas Cross Coleman, Cordova TN

Specialties:

Optometrist

Address:

475 N Germantown Pkwy, Cordova, TN 38018

Thomas C Coleman, Cordova TN - OD (Doctor of Optometry)

Specialties:

Optometry

Address:

475 N Germantown Pkwy, Cordova 38018
(901) 248-0203 (Phone)

Languages:

English

Special Alternator Assembly With An Inherent Ballast Impedance Characteristic For Lighting Systems

US Patent:

5808450, Sep 15, 1998

Filed:

Aug 15, 1996

Appl. No.:

8/698134

Inventors:

Stanley S. Chula - Rothschild WI
Gary L. Schurter - Wausau WI
Lowell R. Stuebinger - Schofield WI
Thomas H. Coleman - Germantown TN

Assignee:

Marathon Electric Manufacturing Corporation - Wausau WI

International Classification:

H02P 900

US Classification:

322 22

Abstract:

An engine-driven alternator assembly includes an output winding having an internal impedance characteristic similar to a separate stationary ballast for high intensity discharge lamps. The output winding is direct connected to lamps in a mobile light tower application having four HID lamps. The alternator assembly includes four separate alternator units each having an output winding wound to establish the inherent internal impedance to provide a ballast source for the connected lamp. Each alternator unit has its rotor mounted on a common shaft connected to the shaft of the engine. Each alternator unit establishes an open circuit voltage to strike an arc across the HID lamp and then a sustaining voltage to maintain current flow as well as limiting the current to the lamp. The alternator unit has a high frequency output, preferably within 200 to 600 hertz. The alternator unit is a permanent magnet alternator, a switched reluctance alternator, an induction alternator, or a wound synchronous alternator.