A UNIFIED THEORY OF TORSIONAL OSCILLATIONS IN ELECTRICAL MACHINES AND ELECTROMECHANICAL SYSTEMS

ABSTRACT The torsional oscillations in electrical machines are not only dependent on the machine quantities, but also on the peculiarities of the shaft-line and network. Free (SSR or hunting) as well as forced oscillations of synchronous or asynchronous machines can be treated by a unified theory taking proper account of the aforementioned influences. This will be illustrated with the help of practical examples and the basic guidelines of the theory will be outlined in short.