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).
Technical discussion on modifying the winding specifications of an armature for a Lucas dynamo.
| Identifier | ExFiles\Box 36\4\ scan 239 | |
| Date | 11th August 1921 guessed | |
| Contd. -2- EFC5/F11821. All things considered, we think it would be much more to the point if Mr. Gamble wound up an armature on the same scheme of winding, but with a larger number of conductors of the next gauge finer wire, and we suggest that the winding be made to consist of 840 conductors in place of 660, giving 28 conductors per slot instead of 22, or 14 turns per coil in place of 11. Unfortunately this does not correspond to the next lower size of S.W.G. wire, namely No.19, which is .040", but corresponds to No.19 B.W.G. - .042" dia. We feel that if No.19 S.W.G. is used, we shall be carrying the modification too far and that if possible No.19 B.W.G. should be obtained and used for this purpose. This should produce a machine with a cutting in point approximately as specification, but one which will give less amperes than the standard at moderate and high speeds, but which may possibly give sufficient amperes to meet our specification. If we are successful in this idea, it may be a way out of the difficulty we are in at present with Lucas' with these dynamos. It may mean that the modification required to the machine is merely one of stripping the winding and altering it to the new winding proposed. | ||