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).
Experimental work on a plain shunt chassis dynamo and associated voltage regulators.
| Identifier | ExFiles\Box 62\3\ scan0284 | |
| Date | 20th April 1932 | |
| X6142 To Ey. From Hs{Lord Ernest Hives - Chair}/Wst. To E.{Mr Elliott - Chief Engineer} c. to Ey/Rd. c. to WOr.{Arthur Wormald - General Works Manager} HS{Lord Ernest Hives - Chair}/Wst.6/MA. 20.4.32. PLAIN SHUNT CHASSIS DYNAMOS. X6092 With a view to further progressing our experimental work on regulators for our dynamos we should like instructed a plain shunt dynamo which we could use in conjunction with any voltage regulator we should wish to try out on an experimental car. We recommend that this dynamo should be of the 20/25 size but differ from standard as follows :- (a) The poles would have to be concentric not ground taper as at present. (b) The field winding in the first instance rewound with as many turns as can conveniently be accomodated of 22 SWG wire. (c) The control brush removed and one end of the field winding connected to the positive terminal, the other end being taken to the centre terminal C. On chassis 19-EX it was decided at the last minute that we should fit a plain shunt R.R. dynamo running in conjunction with a known good type of regulator. In order to save time we took one of our old standard machines which had concentrically ground poles, removed the control brush and rewound the field winding with 21 SWG wire. The regulator we tested with this dynamo was the C.A.V. type B2 which we were able to adjust satisfactorily on the bench to suit the dynamo. This regulator is a two stage vibrator (one stage inserting resistance and the other stage short circuiting the field) and so far appears to be more satisfactory in design than the Bosch. Hs{Lord Ernest Hives - Chair}/Wst. | ||