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).
Clarifying the reasons for using a specific wire gauge in the 40/50 HP dynamo with a C.A.V. vibrator regulator.
| Identifier | ExFiles\Box 60\3\ Scan246 | |
| Date | 19th September 1933 | |
| 86044 PN.{Mr Northey} From Hs{Lord Ernest Hives - Chair}/Wst. c. to Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} Hs{Lord Ernest Hives - Chair}/Wst.2/MA.19.9.33. BENSPORT AND 40/50 HP. DYNAMO FOR USE WITH C.A.V. VIBRATOR REGULATOR. Referring to your PN.{Mr Northey}3/WT15.9.33 in the second paragraph of page two of our report we stated that the reason we were using 17 S.W.G. was because of the better facilities for handling this gauge of wire on production. The reason we used 12 conductors of this gauge was :- (a) To increase the section of iron at the root of the armature teeth. (b) To improve the output heating characteristics of the armature by reducing its ohmic resistance. If we can produce the performance we require on this dynamo with 17 S.W.G. instead of 16 S.W.G. wire it will reduce the costs in armature winding. Hs{Lord Ernest Hives - Chair}/Wst. | ||