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).
Adoption of vibrator control and related issues with dynamo failures on experimental chassis.
| Identifier | ExFiles\Box 60\3\ Scan189 | |
| Date | 1st March 1933 | |
| WST 86092 To R.{Sir Henry Royce} from E.{Mr Elliott - Chief Engineer} See E.1/HP.1.3.33. c.c. Eg. Wor.{Arthur Wormald - General Works Manager} TN. Hs{Lord Ernest Hives - Chair}/Wst. re Vibrator Control. Replying to your memo N.1/M.28.2.33, every effort is being made to adopt vibrator control, but we have never yet completed a 10,000 mile test. There have been one or two dynamo failures with this scheme on Ph.11 and 20/25 experimental chassis, and we may have to go on with the 3rd brush system on Peregrine until the dynamo problem is solved. Because of this our design schemes have always been arranged with the door left open for either type. The regulator does not give any trouble but commutation on the dynamo appears difficult possibly owing to the range of load throughout the range of speed. One of the dynamos that failed was a Scintilla. Hs{Lord Ernest Hives - Chair}/Wst has been continuously working on this problem, and an improved MR. dynamo should soon be available for test. We are very keen to adopt vibrator control. In addition to the advantages mentioned in your memo the switching problem will be simpler and the cutting in speed showing a positive charge of 2 amps is so much earlier as to permit of a still slower running dynamo if found desirable. E.{Mr Elliott - Chief Engineer} | ||