Electricity: single generator systems – Automatic control of generator or driving means – Plural conditions
Patent
1996-08-15
1998-09-15
Stephan, Steven L.
Electricity: single generator systems
Automatic control of generator or driving means
Plural conditions
322 1, 315160, 362192, 362238, H02P 900
Patent
active
058084509
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. A full wave bridge may be connected across the alternator output to supply the limited direct current to the lamp, and the engine may be controlled to create the voltage change.
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Chula Stanley S.
Coleman, Jr. Thomas H.
Schurter Gary L.
Stuebinger Lowell R.
Marathon Electric Manufacturing Corporation
Ponomarenko Nicholas
Stephan Steven L.
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