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 of motor performance under various voltage and temperature conditions.
| Identifier | ExFiles\Box 61b\3\ scan0139 | |
| Date | 11th August 1920 | |
| R.R. 385A (100 T) (S H.{Arthur M. Hanbury - Head Complaints} 119, 11-8-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2800 -4- Contd. For a fair comparison between the four cases tabulated above, the battery voltage should have been set so that the motor terminal volts were, cold standard 10.35; hot standard 10.8; cold, two series two parallel 9.6; hot, two series two parallel 10.4, the values in the tests having been approximately 9.9, 11.1, 8.7 and 10.15. It will readily be seen that the motor with the fields connected two series, two parallel, was at a disadvantage as compared with the standard motor, more particularly in the case of the hot condition. EFC. | ||