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).
The losses tests performed on a self-starter motor.
| Identifier | ExFiles\Box 34\3\ Scan115 | |
| Date | 21th December 1916 | |
| R.R. 250 A (100 T) N.C. 5M. 15-5-16; Cl. 1546. X. 26420. -1- EFCL/T211216. 21st December 1916. LOSSES TESTS OF R.R. SELF STARTER MOTOR. W We have carried out tests of the above description to compare with results obtained with the three different types of armature proposed for this machine. The starter motor was driven by a flexible belt drive from an electric motor, and its fields were excited when necessary from two 12 volt batteries in parallel, using variable resistances and an ammeter in the circuit. The scheme of supply to the driving motor (which was nominally a 200 volt motor) was thus- We used a battery of 7 or 8, 12 volt car batteries in series, in conjunction with the Works 110 volt generator. This was not used to supply current as a rule, because its voltage would not keep up sufficiently, but was made to float on the supply mains from the generator, with just a small charging current. By this means we satisfactorily steadied the supply from the generator. The motor current was actually drawn from the terminals of the battery and the two (motor and battery) in parallel were supplied from the generator through a variable resistance and a cut-out according to the following scheme :- (Contd). | ||