B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
B23K 9/095 (2006.01) B23K 9/10 (2006.01)
Patent
CA 2184773
A method and apparatus for providing a welding output is disclosed. The apparatus includes an ac generator having a field winding, a welding output winding and an electronic field controller connected to the field winding. The controller receives a current feedback signal and a voltage feedback signal and shapes the output curve in response to the desired output command signals. According to one embodiment the controller also receives a field current feedback signal. The controller may shape the output curves to emulate a DC generator, for example by causing the welding output V-A curves to have multiple breakpoints and/or a substantially preset slope over a welding range wherein the preset slope does not vary over the output current range of the power supply. Also, the slope of the V-A output curve below the welding range may be different than the slope in the welding mange. An auxiliary output winding having a substantially constant voltage may be provided on the generator and the generator may be either single or three phase.
Bunker Thomas A.
Smith Alan F.
Finlayson & Singlehurst
Illinois Tool Works Inc.
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