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).
Description and specifications of the Lucas E.575 Dynamo.
| Identifier | WestWitteringFiles\C\May1919\ Scan44 | |
| Date | 7th May 1919 | |
| R.R. 235A (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. EFC1/T7.5.19. To R.{Sir Henry Royce} from EFC. c. to CJ. c. to BN.{W.O. Bentley / Mr Barrington} c. to E.{Mr Elliott - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to EP.{G. Eric Platford - Chief Quality Engineer} c. to EH. ORIGINAL. RE LUCAS E.575 DYNAMO. The dynamo consists of a field carcase of cast iron, of outside dimensions 5¾" diameter by 5¾" long, the thickness of the shell being .375". There is only one polar projection bolted to the inside of this carcase, which constitutes the south pole of the main field. The corresponding north pole consists of a depression hollowed out in the bottom of the carcase (see diagramatic representation on/sheet F). There are two windings on the south polar projection, one a field winding of approximately 5½ ohms resistance when cold rising to nearly 7 ohms when fully hot; the other, a control winding of about .055 ohm when cold rising to .062 ohm when hot. The carcase is provided with aluminium end brackets carrying ball bearings for the armature and one of which carries a system of three brushes arranged on the commutator as diagram- atically represented on sheet F, on which the approximate angles are given. The diameter of the armature is 3.575", active length 2.600". The diameter of the commutator is 2.0" and useful length 1.650". Each brush holder contains a pair of brushes independently held on the commutator, each by its own spring gear. Each of the 6 brushes has a bearing surface .625" by .300". The brushes are of C.M.9 Morganite, fairly, soft, with a large percentage of carbon. The armature is wound with Contd. | ||