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).
Continued breakdown and tabulation of various electrical and mechanical losses in watts for two machine types.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan174 | |
| Date | 27th May 1926 | |
| contd. EFC3/T27.5.26. (1) Belt friction and flexure, bearing friction and windage. (2) Brush friction (mechanical only) (3) Combined hysteresis, eddy current and circulating current losses. (4) Brush short circuited current losses. "A further fairly approximate separation of item (3) into - (3a) Hysteresis loss, (3b) Combined hysteresis eddy current and circulating current losses. has been effected on the assumption that the hysteresis portion is proportional to the speed and the remainder proportional to the square of the speed. All this has been done as carefully as the circumstances of the case reasonably permit, and below are the tabulated results, all figures being in watts. | | Belt & Brg. friction. | Mechan. brush friction. | Hyster-esis loss. | Eddy & circu-lating current losses. | Brush short circuited current losses. | |---|---|---|---|---|---| | Std.machine. | | | | | | | at 1000 RPM. | 37.4 | 18.0 | 34.6 | 18.3 | 84.6 | | at 1500 RPM. | 61.0 | 27.6 | 48.2 | 38.2 | 132.0 | | at 2000 RPM. | 67.5 | 27.7 | 68.5 | 72.0 | 173.3 | | N.B.machine. | | | | | | | at 1000 RPM. | 41.7 | 19.8 | 20.8 | 11.4 | 2.8 | | at 1500 RPM. | 62.7 | 22.9 | 31.2 | 25.6 | 26.1 | | at 2000 RPM. | 71.5 | 29.0 | 41.6 | 45.5 | 33.4 | Contd. | ||