| 摘要 |
PCT No. PCT/FI93/00553 Sec. 371 Date Sep. 20, 1995 Sec. 102(e) Date Sep. 20, 1995 PCT Filed Dec. 22, 1993 PCT Pub. No. WO94/14649 PCT Pub. Date Jul. 7, 1994The invention relates to a propeller drive system for a vessel or the like for operating two contra-rotating propellers (1,2) disposed on two coaxial shafts (3,4) in succession. The power supplies of two electric motors (5,6) rotating the propellers (1,2) comprise a first and second frequency converter (7,8) and their control unit comprises means for controlling the frequency converters (7,8) so that the direction of rotation of the motors (5,6) and their rotational speed from zero up to the nominal speed can be chosen freely. |
