交流電機による実用的船舶推進方式改善の理論と実験

Abstract

Electric ship propulsion systems have been rarely used since old times. However, it can be considered that feasible condition of such propulsion systems has been recently produced owing to various kinds of variation of situation. Six kinds of feasible ship propulsion systems using alternating current machines including author's methods are chosen under such condition in this paper.Conceptions, theories and the test results for continuous speed control of the following two kinds of author's methods of these propulsion systems are introduced.(1) combination of electromagnetic coupling with synchronous motor of which the system is accentuated in economy of fuel oil for ship propulsion.(2) combination of induction generator with synchronous motor of which the system is accentuated in free arrangement of propulsion prime mover.These methods can be considered superior to CPP methods in points of reliability, efficiency and cost.These methods can also be considered superior to other electric ship propulsion systems in points of reliability, efficiency and arrangement, thinking that such methods as use synchronous motors don't need mechanical gearings generally.On the other hand, improvement of constructions of electric machines as well as of systems in these two methods should be considered. Especially, it is important to make these electric machines brushless. Principles of these propulsion systems composed of brushless type electric machines and the results of the experiments confirming the right of the principles are explained in this paper.It could be well-ascertained from the above principles, theories and test results that these two methods are realizable.