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).
Routine procedure for a previous standard 20 HP Dynamo with 29 commutator segments.
| Identifier | ExFiles\Box 51\1\ Scan408 | |
| Date | 29th September 1924 | |
| X.4383 EFC {E. Fowler Clarke - Electrical Engineer} /T29.9.24. PREVIOUS STANDARD 20 HP. DYNAMO ON ROUTINE PROCEDURE. (29 COM. SEGS.) (1) Cold balancing speed for 12.4 volts at 540 r.p.m. 10 volts at 470 r.p.m. and 17 volts at 672 r.p.m. S (2) No amperes at balancing speed as above, 8 amperes (14.0 volts) at r.p.m., 14 amperes (15.2 volts) at r.p.m. S (3) Angular position of control brush 118° from positive brush. Maximum ampere output as in (5) below. C (4) Hot balancing speed for 13.6 volts at 640 r.p.m., 10 volts at 550 r.p.m., and 17 volts at 725 r.p.m. C (5) Balancing speed as in (4). C (6) Hot balancing speed for 13.6 volts at 615 r.p.m.. 10 volts at 515 r.p.m. and 17 volts at 715 r.p.m. S (7) Balancing speed as in (6). For 288 machine, balancing speed 605 r.p.m., 8 amperes at 830 r.p.m., 14 amperes at 1045 r.p.m. S (8) Cold balancing speed for 12.4 volts at 545 r.p.m. 10 volts at 483 r.p.m. and 17 volts at 663 r.p.m. C (9) Balancing speed as in (8). Maximum amperes 15.0 at 1375 r.p.m. C (10) Hot balancing speed for 13.6 volts at 660 r.p.m. Maximum amperes 11.0 at 1600 r.p.m. C EFC. {E. Fowler Clarke - Electrical Engineer} | ||