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 brake test arrangements and torque correction for motors with epicyclic reduction gears.
| Identifier | WestWitteringFiles\T\2July1929-December1929\ Scan021 | |
| Date | 1st July 1929 guessed | |
| -4- contd. In the cases of motors normally utilising an incorporated epicyclic reduction gear, it was more expedient to arrange for the brake test arrangement to include this reduction gear. In these cases a 24" diameter brake wheel is utilised in place of the 10" brake wheel suitable when the brake wheel runs at armature speed. Further, in these cases, the observed values of Tr{Capt. F. W. Turner - Finance} (brake torque) are corrected to motor armature speed by dividing by the reduction gear ratio i.e. so as to consider the loss which occurs in this incorporated reduction gearing as being part of the loss which determines the mechanical efficiency of the motor. The data and curves now given have been prepared from results either comparatively recently taken, as in the case of the sequence motors, or in the case of the other motors considered, from results taken some time back but now reviewed in the newer way herein described. The following are the various motors considered, with index numbers to correspond with the numbers given on the various curves, and remarks appropriate to the individual cases :- | ||