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).
Improving the Peregrine starter motor by producing a second version and considering a larger model.
| Identifier | ExFiles\Box 62\1\ scan0048 | |
| Date | 11th July 1932 | |
| X6134 By.{R.W. Bailey - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Wst. c. E.{Mr Elliott - Chief Engineer} c. By/Rd. Hs{Lord Ernest Hives - Chair}/Wst.7/MA.11.7.32. PEREGRINE STARTER MOTOR. We are producing a second starter motor with a lower resistance main field winding and armature winding in order to improve the torque of the Peregrine starter motor. As this motor owing to its extremely small size must be inefficient we ought to consider a motor having a 4" diameter carcase to replace the existing one as soon as possible in the event of its torque - speed characteristic being still unsuitable. It would then be possible to increase the diameter of the armature by .125" thus enabling us to get in 16 S.W.G. wire with an appreciable increase in the slot neck width, or 15 S.W.G. without any decrease. Also the main field winding could have a greater cross section of copper strip as well as a better iron circuit in the poles. We understand from E.{Mr Elliott - Chief Engineer} that it would be possible to accommodate the extra width of carcase with a slight ateration to the crankcase. Hs{Lord Ernest Hives - Chair}/Wst. | ||