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).
Different winding arrangements for a starter motor experiment.
| Identifier | WestWitteringFiles\K\June1923\ Scan72 | |
| Date | 19th June 1923 | |
| Contd. -2- EFC4/T19.6.23. the scheme sent herewith, which has been got out for us by the D.O., shows these two arrangements of main and teazer windings, both of which are proposed for experiment in the first instance. Regarding the teazer winding, we think it possible that this may be found to be too fine, and recommend [handwritten: suggest] that we try also No.16 gauge wire (about 36 turns) in the first instance. The resistance of the present 13 turns of 18 SWG. wire at 20°C is about .6 ohm. Assuming 11 available volts and allowing for the resistance of the actuator box and back E.M.F. of the motor. the teazer current will not be much greater than 10 amperes. Our experience with the silent starter motor scheme, reported in our EFC1/T2.6.23, was that a much bigger current was necessary to effect the turn over than was at first supposed. For this reason we have arranged that the scheme sent also shows the two arrangements of main winding. together with the alternative teazer winding suggested. Altogether therefore four different combinations are shown. EFC. | ||