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).
Potential design improvements for magnetos, specifically regarding laminated components and efficiency.
| Identifier | ExFiles\Box 4\5\ 05-page180 | |
| Date | 12th April 1921 | |
| To EFC. from R.{Sir Henry Royce} c. to CL X.430 RE/G12.4.21. X.430 - EE MAGNETOS. X.2375. X.3209. I hope you have seen Mr. Watson's (belonging to the M.L. Syndicate) paper on Magnetos. I do not know if you have had a magneto from these people, but apparently the paper shews that there is benefit to be obtained from laminated poles, or in the case of the sleeve machine, laminated sleeves, and also in the long type of cam. I note your remarks that the slow speed position could not be the retarded position because of the rapid reduction in efficiency when advanced. Surely something might be done in this direction because when the magneto really requires a full advance, it is running at a very fast speed, and therefore would not matter if the minimum speed were a very fast speed. If, however, it is impossible to take advantage of this feature, something might be done in shaping the poles because since the efficiency and minimum speed in the advance position is unnecessarily low something can be sacrificed to transfer this, so as to increase the efficiency at the low speed by sacrificing some of the high speed. Perhaps a combination of slanting pole pieces formed like a double helical gear, and laminations might have the required effect. You will see that something desperate must be done otherwise we shall have all the magnetos being returned from America possibly to scrap. I therefore think you ought Contd. | ||