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).
Test results and analysis of losses in various armatures.
| Identifier | ExFiles\Box 34\3\ Scan120 | |
| Date | 15th May 1918 | |
| R.y 56 a (400 T) (S.C. 530. 15-5-18) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 1846. -6- (Contd). These results for m, m + a are tabulated in amperes, and need multiplying by 78.5 to convert to power units (watts) The results for m + a + c, and for c are given as curves, for the various armatures tested. Exp. Armature m average. m + a a.{Mr Adams} No. 7 17 slot B. .66 .87 .21 8 45 slot .66 .87 .21 9 24 slot .66 .87 .21 10 24 slot unwound .66 .89 .23 11 17 slot A .66 .86 .20 12 45 slot unwound .66 .87 .21 It seems peculiar that the hysteresis and eddy current losses for an unwound new armature, should come out greater than for an used one, but such is the result we have obtained, not only in the two cases recorded, but also in a previous less satisfactory test which we have not recorded. This may be due to the recent armature stampings being from a different batch of material. | ||