GB456488A - Improvements relating to electric propulsion systems for ships - Google Patents

Abstract

456,488. Transmitting mechanical power. CROOK, H. N., and REBBECK, F. E., Queen's Island, Belfast. March 11, 1936, No. 7303. [Class 38 (iv)] [See also Group XXXVII] An electric ship propulsion system comprises two generator-motorrheostat assemblies, a divided generator field in each case being connected to its associated rheostat during normal use, whereas when one generator is out of use, the divided fields of the remaining generator and the two motors are connected for control to both rheostats. The port generator-motorrheostat assembly Gp, Mp, Rp and the corresponding starboard assembly are each self-contained during normal running when the switches 2, 3, 5, 6 are closed and the controller C is adjusted so that the row I of drum contacts engages the stud contacts A. The fields Fm of the motors are then regulated and reversed by the adjustment of the movable constacts of the rheostat over resistances R2. The fields Fg1, Fg2 of each generator are then supplied in parallel from mains B through rheostat resistances R1. If the starboard generator G3 is cut out by adjustment of the drum controller to position II and used for some other purpose, switches 2, 4, 7 are closed so that the armature circuit of the port generator Gp and of the two motors are in series. The motor fields Fm are then reversed and controlled each by its corresponding rheostat through resistances R3, an additional resistance R4 being introduced into each circuit. The two field windings Fg1, Fg2 of the generator Gp are then controlled respectively by resistances R1 of the port and starboard rheostats. When controller C is adjusted to position III, the port generator is similarly cut out. A variable rheostat R5 controls the field of whichever generator is cut out.