From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Specifications and experimental proposals for motor field windings and terminals.
| Identifier | ExFiles\Box 64\2\ scan0169 | |
| Date | 30th June 1928 guessed | |
| -4- Contd . (4) The three terminals on the carcase should be the terminals of the field windings, the centre terminal being the junction of the teazer and main, i.e. the windings should be brought to these terminals and not connected to the brushes. We make this connection externally. (5) The brush and bearing brackets should be suitably slotted to enable the brushes to be turned into any position. (6) An insulated terminal should be provided on this bracket in connection with the insulated pair of brushes, the earthed pair being as usual in connection with the frame. In addition to the above suggested experiments, the a further experimental field windings of 9½ turns per pole on each of two opposite poles for the main winding, the other pair of opposite poles being wound with teazer winding (as many turns as convenient of the same section No.17 S.W.G. as at present used) should be made. This, it will be remembered, was one of the original experimental proposals resulting from the fact that this method of winding is used on the Bosch sliding armature starter motor. Having been already made for the motor at present in existence, we have two sets of main field windings, one of 3½ turns per pole and one of 6½ turns per pole, so that it would be necessary to provide two further sets, one of 4½ and one of 5½ turns per pole, for the experimental motor. In regard to the existing motor and the motors that are to be made for EAC.10, so far as we can tell at present the best number of main field turns is 5½ per pole, always of course of the minimum possible resistance. We | ||