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).
Page detailing formulas for motor efficiency and armature reaction.
| Identifier | ExFiles\Box 61b\3\ scan0104 | |
| Date | 15th July 1929 guessed | |
| -4- Øs/ØE (Electrical) ( = es/E ) and Tr{Capt. F. W. Turner - Finance}/Øs (Mechanical) ( = Tr{Capt. F. W. Turner - Finance}/Ts ) the product of which is the overall efficiency of the motor, but also to obtain a third quantity Øs/Øe which is of importance as an expression of the armature reaction effect. We call this the armature reaction efficiency. A convenient way of exhibiting these efficiencies graphically is to plot them on an ampere base, or alternatively some or all of the quantities E, ee, es, Øe, Øs, Ts, Tr{Capt. F. W. Turner - Finance}, may be plotted on such a base, say E, es, Øs, Ts, Tr.{Capt. F. W. Turner - Finance} Since the general relations above are actually e = (Z P N / (60x10^8 x b)) . Ø volts. T = (1.41 Z P C / (10^8 x b)) . Ø lb-inches where Z = No. of conductors P = No. of poles b = No. of parallel paths through armature. N.= Speed in R.P.M. Therefore Φ (kilolines) = (60 x 10^5 x b / Z P) x e/N = α . e/N (say) and also = (10^5 x b / 1.41 Z P) x T/C = β . T/C (say) contd. | ||