Numerical analysis techniques applied to a model iron-cored compulsator

Work on two aspects of iron-cored compulsators is reported. Firstly, detailed modelling and analysis of a passively compensated form of machine is considered. A coupled-circuit model is presented which allows current variation in all windings to be found. This model gives rapid numerical solutions and also permits algebraic solutions to be obtained. Comparison with experimental results is shown to be good, provided that linear conditions prevail. To account for iron saturation, a detailed finite element model (which includes externally connected circuits) is presented. This model is shown to give good predictions of performance in all conditions. The second area of reported work concerns a passively compensated machine with a three-phase stator and compensating windings. Results for two stator connections (120/spl deg/ and 60/spl deg/) are given. It is shown that the 120/spl deg/ connection gives a ´long´ pulse output of approximately 1.5 times the AC cycle time before loading. The 60/spl deg/ connection gives a shorter pulse, but of larger amplitude.<>