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).
Instructions detailing tests performed on a 28 slot armature in a standard (NB) machine.
| Identifier | ExFiles\Box 68\4\ scan0023 | |
| Date | 18th October 1927 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 451-8-12-24) MP 306975 X 8672 ROLLS-ROYCE LTD. INSTRUCTIONS. To E.F.C. Order No. P.D.7. Customer's No. X 8671 X8672 Oct. 18th 1927 28 Slot Armature in Standard (NB) Machine. The first tests on the 28 slot armature in conjunction with the carcase of a standard (NB) machine, have now been completed. Three armatures, made originally to the drawings D71347 and D71348, were used, and the particulars of which are as follows:- 1. Armature with commutator connections retarded one segment from the position given in the drawing, giving an average B angle of 13° retard, in the standard carcase. 2. Armature exactly to the drawings giving an average B angle of about 7° retard in the standard carcase. 3. Armature with the commutator retarded 2.5° from the position given in the drawings giving an average B angle of about 9°. The carcase of dynamo J was used for the tests Observations on the maximum permissible Signed Cont'd.{John DeLooze - Company Secretary} This Sheet must be filed on completion of the work. | ||