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).
The testing of a regulator and switchbox, focusing on the effects of vibration and open circuit voltage.
| Identifier | WestWitteringFiles\F\February1921\ Scan99 | |
| Date | 14th February 1921 | |
| Contd. -2- EFC2/T14.2.21. this ring in its uppermost position, causing the field circuit of the dynamo to be shunted by the series coil in the regulator. Thus, at high speeds the armature should be rapidly making and breaking contact on the ring to provide the necessary regulation. We found quite early on that the switchbox with contained regulator could not be satisfactorily used in any but an upright position. At first we had the regulator operating quite satisfactorily and we obtained a curve of open circuit voltage (with the regulator as originally set), which curve is reproduced, together with corresponding field current, on the photostat herewith. This curve was taken with the regulator in a warm condition and subject to some small amount of vibration which was produced by gently tapping the regulator with the hand to represent the small amount of vibration it would receive on a car, the switchbox being fixed to a rigid table. Unless we did this we found that the regulation was rather indefinite in operation. We found the small amount of vibration applied quite necessary for consistent operation. So long as the regulator was functioning correctly we found the switchbox to keep quite cool for all dynamo speeds. Having ascertained the open circuit voltage control, we then proceeded to investigate the operation of the system, firstly, on a fully charged battery and latterly on the same battery from which discharge currents of 5, 10 and 15 amperes were taken. First, as regards the operation of the system on a Contd. | ||