| 摘要 |
PURPOSE:To contrive to enhance the performance of electric propulsion, by a method wherein a parallel circuit of a direct power-supplying circuit and a through-controller power-supplying circuit is provided between an AC generator and an AC motor. CONSTITUTION:In a low-speed high-torque operation of a ship, electric power obtained by the AC generator 2 can be supplied to the AC motor 3 through a thyristor 7, so that a high-torque characteristic can be obtained by a Ward- Leonard control through the thyristor. In addition, since the through-controller power-supplying circuit 6 is provided for the motor 3 separately from the direct power-supplying circuit 5, a thyristor device 7 having a capacity according to the necessity can be inserted. Further, in a low-torque operation, the direct power- supplying circuit 5 is used so that the intrinsic characteristic of the motor 3 can be utilized. Accordingly, an electric propeller relatively inexpensive and having higher performance as compared to conventional propellers can be obtained. |
