Electric heating – Metal heating – By arc
Patent
1999-10-05
2000-12-26
Shaw, Clifford C.
Electric heating
Metal heating
By arc
322 38, B23K 910
Patent
active
061663492
ABSTRACT:
A hydraulically driven welding machine employs a closed loop control system for maintaining a constant speed of a generator. A feedback device produces a controlled frequency proportional to the actual generator frequency. The controlled frequency is compared with a reference frequency preset in the machine. Any error between the controlled and referenced frequencies is used to control a proportional flow control valve to regulate the flow of hydraulic fluid through a hydraulic motor that rotates the generator to maintain a constant generator speed under varying welding conditions. The source of the hydraulic fluid may be a hydraulic system of a motor vehicle. In an alternate embodiment, an adjustable orifice produces a pressure drop in the hydraulic system. A change in generator speed changes the pressure drop. The pressure drop is used to control a valve that diverts the proper amount of fluid flow to the hydraulic motor to maintain a constant pressure drop and thus a constant generator speed.
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Crowley Chad L.
Williams Robert G.
Breh Donald J.
Croll Mark W.
Illinois Tool Works Inc.
O'Brien John P.
Shaw Clifford C.
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