Abstract

As for the technics of the electronics for ships in Japan, automatic maneuvering systems and other instruments for ships have been developed as a field of the technical improvement in marine developments. Although the automation and modernization have been made in various directions, their center is “Super automated ships by computor control”.
In recent times the eddy-current coupling has been applied to speed control equipments and buffer equipments of the tortional vibration in marine engines. The generalized formulae by Mr. E. J. Davies are applicable to the construction design in the eddy-current coupling as it is universally known. Nevertheless the equivalent circuits to its physical contents have never been studied enough, and in the speed control system applied to the eddy-current coupling the transfer function showing the relation between the exciting current and the autput torgue has been recognized as the constantK_τ, having no delay time.
In this paper, authors have shown the eddy-current coupling as the simple equivalent circuit, and obtained the relation between the exciting current and the autput torque by the frequency response method. They have also obtained some useful effect that its tranfer function had to be recognized as the delay function, and devised the speed control system, having many excellent merits in efficiency, quick response and dimensions etc.