Patent GB-191012417-A (GB)
Title: Improvements relating to Systems of Marine Propulsion.
Inventor: KALMAN VON KANDO
IPC: B63H23/24
Filed: 1910-05-21
Abstract: 12,417. Kando, K. von. May 22, 1909, [Convention date]. Void. [Published under Section 91 of the Act.] Dynamos and motors combined for transmitting power.-In an electric power transmission system of the kind in which a number of alternators are employed in conjunction with a number of induction motors connected to the propellers of a ship, to obtain a number of definite speeds by changing the connexions between the alternators and motors, the various connexions and combinations of the alternators and motors are effected by means of electrically controlled or operated contactors, the operating-coils of which are connected to a master controller. The operation of the controller also regulates the speeds of the prime movers to bridge the intervals between the definite speeds, and varies resistances in the secondary circuits of the motors while the prime movers are adjusting themselves. A switch for reversing the connexions between the alternators and motors is also operated by the controller; and a controller may be placed in several places on the ship. In the arrangement shown in Fig. 1, the regulator of the prime mover is operated by a motor 14, the direction of rotation of which is controlled by means of an electro - magnet 6 provided with a polarized armature 7. The electro-magnet 6 is placed in the bridging-wire of a wheatstone bridge having calibrated wires 1, 2 and movable contacts 3, 4. When it is desired to operate the regulator of the prime mover, the balance is disturbed by moving the contact 3, which causes the motor 14 to rotate until the contact 4 connected to it restores the balance. The controller for varying the connexions between the alternators and motors consists of a rotating arm 37 connected to one pole of a battery 36, and a number of contacts 15, 16, 17, &c. connected to a common lead 35 through magnetically operated or controlled contactors 25, 26, 27, &c., Fig. 2. The contactors 25, 26, 27, &c. are arranged to vary the connexions between the alternators and motors according to the position of the arm 37, while the intervals between the definite speeds so obtained are bridged by means of the arrangement shown in Fig. 1, the sliding contact 3 engaging with the separate calibrated wires 1 being mounted upon the arm 37. In the arrangement shown in Fig. 3, the circuits of the various calibrated wires 1 are completed through adjustable resistances 38 by means of relays 39, the coils 40 of which are energized by the current passing through the contactor coils. The calibrated wires 1 overlap one another to a small extent, so that, before the contact 3 leaves one calibrated wire, it engages with the beginning of the next. As the speed of the prime mover does not instantly respond to the sudden change of position of the speedregulator, while the connexions between the motors and alternators are effected as soon as the arm 37 engages the next contact, resistances controlled by the main switch are placed in the secondary circuits of the motors, as described in Specifications 16,960/99, 6261/01, and 26,966/02. The direction of rotation of the motors may be reversed by a separate reversing- switch. In another arrangement, the main switch is provided with two sets of contacts, one for each direction of rotation of the motors,- an arm controlling the energization of one of two electro-magnets provided with a common core mounted upon a lever, which carries two sets of contacts adapted to change the connexions of two of the conductors of the threephase system.