NUMERICAL-ANALYSIS TECHNIQUES APPLIED TO A MODEL IRON-CORED COMPULSATOR

Work on two aspects of iron-cored compulsators is reported. Firstly, d etailed modelling and analysis of a passively compensated form of mach ine is considered. A coupled-circuit model is presented which allows c urrent variation in all windings to be found. This model gives rapid n umerical solutions and also permits algebraic solutions to be obtained . Comparison with experimental results is shown to be good, provided t hat linear conditions prevail. To account for iron saturation, a detai led finite-element model (which includes externally connected circuits ) is presented. This model is shown to give good predictions of perfor mance in all conditions. The second area of reported work concerns a p assively compensated machine with 3-phase stator and compensating wind ings. Results for two stator connections (120 degrees and 60 degrees) are given, It is shown that the 120 degrees connection gives a 'long' pulse output of approximately 1.5 times the AC cycle time before loadi ng. The 60 degrees connection gives a shorter pulse, but of larger amp litude.