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).
Comparison table of design figures versus actual performance data for an R.R. sequence motor.
| Identifier | WestWitteringFiles\T\2July1929-December1929\ Scan025 | |
| Date | 1st July 1929 guessed | |
| -8- contd. better proportioned teeth and slots than in previous cases. On the other hand the mechanical efficiency is a good deal poorer than assumed in the design. The actual comparison is :- Quantity Design Actual figure motor Current C 180 180 amperes Terminal voltage E 8.4 8.4 Speed N 640 635 Brake torque Tr{Capt. F. W. Turner - Finance} 81 81 pound-inches Back E.M.F. es 3.78 4.25 volts Working flux per pole Øs 240 268 kilolines Conductor torque Ts 90 101 pound-inches Electrical efficiency es/E .45 .5305 Mechanical efficiency Tr{Capt. F. W. Turner - Finance}/Ts .90 .80 Overall efficiency η .405 .405 There is good reason to believe that this R.R. sequence motor, of given size and weight, is proportioned electromagnetically in approximately the optimum manner generally, and in particular so as to produce the largest stalling torque on the given characteristic of supply, which characteristic permits of a maximum supply power to the motor of 1800 watts (6 volts x 300 amperes) | ||