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).
Description of the T. & M. Dynamo, its construction, and the principle of its operation using a four-brush system.
| Identifier | ExFiles\Box 3\5\ 05-page006 | |
| Date | 1st October 1911 guessed | |
| Description of the T. & M.{Mr Moon / Mr Moore} Dynamo. The T. & M.{Mr Moon / Mr Moore} Dynamo may be briefly described as consisting of a shunt wound dynamo to which has been applied a new arrangement and interconnection of brushes which automatically control the output of the machine within a very wide range of speed. The following remarks refer to the T. & M.{Mr Moon / Mr Moore} two-pole machine, though they apply equally well to a multi-polar machine which may be designed on the same principle. The main feature of the machine is the provision of four brushes, viz.:- two main and two auxiliary brushes which are disposed equally round the commutator, the main brushes being fixed in the ordinary or neutral position and the auxiliary brushes half a pole pitch in advance, and they are connected to their respective main brush through a suitable external resistance. It will be noticed (see Fig. 1) that the field magnet windings are connected direct to the main brushes, so that with the removal of the auxiliary brushes and resistances the machine becomes an ordinary shunt wound dynamo, and it is by the introduction of the auxiliary brushes and resistances and in the general design of the machine that the regulation of the output is effected. 3 | ||