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).
Endurance test results for Lucas and Bosch vibrator controlled dynamos.
| Identifier | ExFiles\Box 60\3\ Scan226 | |
| Date | 2nd May 1933 | |
| E.{Mr Elliott - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Wst. c. to Wor.{Arthur Wormald - General Works Manager} d.{John DeLooze - Company Secretary} to Sg.{Arthur F. Sidgreaves - MD} c. to By.{R.W. Bailey - Chief Engineer} c. to PN.{Mr Northey} x 6092 Hs{Lord Ernest Hives - Chair}/Wst.5/MA.2.5.33. x4562 x6100 ENDURANCE TESTS OF LUCAS AND BOSCH VIBRATOR CONTROLLED DYNAMOS. We have recently run on the high speed bench rig a Lucas and a Bosch dynamo of the same size as our 20/25 machine. Both dynamos are arranged as plain shunt machines, vibrator controlled. Each machine was run continuously (except overnight) for an equivalent run of 5000 miles on the 20/25 chassis at a dynamo speed of 5000 R.P.M. The output of the machines was controlled so that the dynamo carcase did not attain a greater temperature than 80°C. This output at 13 volts at dynamo terminals was 11.6 amperes in the case of the Lucas and 10.7 amperes for the Bosch. Both dynamos completed the run satisfactorily and the brush wear was found to be :- Lucas:-Positive brush .050" Negative brush .026". Bosch:- Positive brush .031" Negative brush .056". The commutators appeared, in each case, to be in a reasonable condition. At high speeds in both machines excessive vibration was noticeable, suggesting bad dynamic balance. Tests are proceeding with the latest RR. shunt dynamos and it will be interesting later to compare the results obtained. We now have seven chassis equipped with vibrator controlled dynamos three of the 40/50 and Bensport type and four of the 20/25 and Peregrine type. Hs{Lord Ernest Hives - Chair}/Wst. | ||