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).
Calculations and trial results for determining the angles and maximum amperes of a 20 HP Dynamo.
| Identifier | ExFiles\Box 165\6\ img233 | |
| Date | 18th December 1929 | |
| X6003 18.12.29. X.5664. INTERMEDIATE OUTPUT 20 HP. DYNAMO. N angle determined by RJA. geometrically from winding diagram = 55.5° B angle required by RJA. tentatively for this machine = 7.5° Therefore M angle given to D.O. for armature = 48° ----------------- Running check of B angle gave 7.5° B.P.D. Commutator end plate slotted by RJA. to provide trial B angles of 3½°, 5½°, 7½°, 9½°, 11½°, 13½° Resulting maximum amperes 120.5, 122.5, 123, 125, 126, 128. Angles ultimately arrived at B = 7½° C = 123° for major output. | ||