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).
Mr. Royce's instructions on dynamo and motor armature specifications for four-pole machines.
| Identifier | ExFiles\Box 68\4\ scan0221 | |
| Date | 12th June 1921 | |
| C.ntd. -2- EFC2/12.6.21. commutator spokes. He has instructed that in all cases of four pole machines a number of the form 4 m + 1 shall be adopted for the number of slots, and equal slot pitches, this being very nearly equal to the polar pitch on the armature. As already stated, he instructed that the Goshawk I dynamo and motor as already instructed should be corrected to suit this rule. Mr. Royce asked for drawings and tables giving the particulars of the end connections of the various dynamos and motors of other people's makes. We are preparing the necessary tables, but should be glad if Mr. Robinson would look up some drawings of armatures which Mr. Ormerod had made and let us have prints of these to forward to Mr. Royce. These include, we think, the Lucas, Smith, and C.A.V. armatures and perhaps others, but we are not quite certain of the exact machines of which schemes of the armatures were made. EFC. | ||