Patent GB-191508334-A (GB)
Title: Improvements in Dynamo-electric Power-transmission Apparatus of the Unipolar Type.
Inventor: BRESLAUER MAX
IPC: H02K31/04
Filed: 1915-06-04
Abstract: 8334. Breslauer, M. June 4, 1914, [Convention date]. Dynamos and motors combined for transmitting power.-Relates to power-transmission apparatus of the kind described in Specification 18,051/11 in which two homopolar machines running as a generator and as a motor are employed, and consists in utilizing the air-gap at both sides of the exciting- winding for the purpose of generating and receiving current so as to reduce the weight of the apparatus. In the form shown in Figs. 1 and 2, in addition to the usual current-transmitting rings F<1>, F<2>, further copper rings 12, 13, 14 of wedge shape are provided for both machines ; these rings are connected conductively with the corresponding iron bodies. The stator rings A<1>, A' are in halves separated by insulation 15. Two copper members 16, 17 with interpenetrating comb-like teeth and peripheral rims 18, 19 are secured to each stator so that the working current takes the course shown by the full lines and arrow-heads. In the modification shown in Fig. 4, there are two generators A', A" which have a common rotor C<1>. The motor side consists of a single machine A', the rotor C<2> of which is carried by a slow-speed shaft 4<11>, such as the propeller shaft of a turbine steamer, the rotor C' of the generator being carried on the shaft 4<1> coupled to a turbine. The working current takes the path shown by the dot-and-dash lines, the connexion between the machines being effected by means of a copper bell 14 and a copper disk 14<11>, connected conductively to the stators A', A<11> respectively, but insulated from each other by a layer 26. The copper bell 14 is formed at its free edge with projections 20, which are connected electrically to an annular copper covering of the right-hand stator-half A' by screws 21, a similar conductive connexion being made between another copper bell 14<1> and the copper covering 17 of the left-hand stator-half A<2>. Copper rings 13, 13', F<2>, F<21> are secured to the rotor, and similar rings 18, 19 are fixed to the stator opposite to the exciting-winding E<2>. Annular grooves are formed at the stator periphery to receive mercury, which forms the conductive connexion between the rotating and stationary parts. The mercury is retained in the grooves by the action of centrifugal force, and this action may be aided by arranging pipes from the grooves in the stator and rotor and connecting them together by pipes outside the driving-mechanism. The mercury may be utilized to cool the machine by cooling it outside the driving-mechanism. The cooling of the machine may also be effected by circulating water in the cavities between the bells 14, 14<1> and the stator A'. The copper rings, such as the ring 29, Fig. 5, are preferably connected electrically to the corresponding iron parts, such as the part A, by providing the iron with a copper coating 28 by a galvanic process, and then screwing or bolting the copper ring 29, previously amalgamated, to the iron body. The Specification as open to inspection under Section 91 (3) (a) describes also a construction, Fig. 6 (Cancelled), in which the motor and generator sides are symmetrical and the conductive connexion is made by means of mercury situated between the peripheries of the rings 13, 29 and also by means of mercury situated between the peripheries of the rotor plates 31, 32 and a stationary copper ring 30. This subject-matter does not appear in the Specification as accepted.