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).
Specifications for an armature winding and a procedure for determining various experimental losses.
| Identifier | ExFiles\Box 34\3\ Scan118 | |
| Date | 15th February 1916 | |
| -5- (Contd). No. 3. 24 slot, 48 com Bars. 48 coils, (each 4 conductors in series. (and 2 conductors in parallel. 384 conductors. 4 pole lap wound armature. Forward pitch 25 conductors. Backward pitch 23 conductors. The various losses determined in the experiments may be listed as follows.- (m) Power for driving motor running light. (a) Belt drive, bearing friction and windage. (b) Brush friction. (c) Hysteresis and eddy currents at various excitations. (d) Brush-short-circuited currents at various excitations. The measurements are - (1) m (2) m + a (3) m + a + c (4) m + a + b (5) m + a + b + c + d and the various items are deduced by subtraction. (Contd). | ||