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).
High-speed dynamo performance, cooling methods, and potential mounting improvements.
| Identifier | ExFiles\Box 173\2\ img189 | |
| Date | 22th February 1934 guessed | |
| VI They said they had dynamos running that did 100 R.P.M / M.P.H. and the cars would do 80 M.P.H. which means 8000 dynamo R.P.M. Their main trouble at these high speeds is due to vibration from the present-belt drive mountings which are far from rigid. I shewd them our mounting and they said 8000 R.P.M. should be possible on this. No special winding precautions. Brush wear passable They are sold on air cooling. On the Cadillac for some time they have used an air scoop, on the new in Delco they are using an air scoop and a sirocco-type fan fin to draw in air. They admit they have not much desert experience with the fan type yet, but with the air scoop the brush wear has not worried them. If they can do this in America, where the dust conditions in some places are exceedingly bad, we ought at least to try it out. They say it puts the output up enormously. I suggested we might get a lot from insulating our dynamo from the crank-case but they were not enthusiastic. They run their machines to 120°C. but they have gone to current regulation as a half way step to voltage control. | ||