Wacker Neuson G 2.1A Repair Manual

Wacker Neuson G 2.1A Repair Manual Manual pdf 27 page image

5A-150 HZ PORTABLE GENERATORS G3.3A/G4.6A/GS4.6A/GS5.7A 5A5.1 Theory of Operation – Brush GeneratorsThese models are designed to operate with closeregulation when supplying single phase loads. Theprinciple of operation is schematically represented inFigure 5-1, and a cross-sectional view in Figure 5-2. Theauxiliary winding (a) provides excitation power througha choke (b) and bridge rectifier (c) into the rotor winding(d) via slip rings and brushes. The AVR (e) divertsexcess excitation to maintain the stator winding (f)output voltage within close limits. The main stator windingis designed for series/parallel connection to give a dualvoltage output.Figure 5-1. Principle of Operation Schematic1022SD73Bridge Rectifierc AuxiliaryWindingabChokedBrush and SlipRing AssemblyRotorWindingfMainStatorWindingfMainStatorWindingeAutomaticVoltageRegulatorBasic Generator TheoryThese generator models use a brush/slip ring design togenerate and regulate power and consist of a rotor,stator, diode bridge, and an auxiliary winding. They alsoincorporate a choke that is connected in series with theauxiliary winding. The choke’s purpose is to bring thecurrent in the auxiliary winding “in phase” with the mainwindings. The current from the auxiliary winding is carriedto the rotor via the brushes and slip rings.The generators also contain an Automatic VoltageRegulator (AVR) that maintains a specific voltage outputregardless of load. The voltage regulator accomplishesthis by regulating DC current from the auxiliary winding.When the load on the generator increases, the voltageregulator allows additional DC current into the main rotor.The additional DC current allows the generator to increaseoutput and maintain the desired output voltage.