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).
Testing and adjusting the current regulator for a battery charging system under various conditions.
| Identifier | WestWitteringFiles\F\February1921\ Scan100 | |
| Date | 14th February 1921 | |
| Contd. -3- EFC2/T14.2.21. fully charged battery (from which no discharge current was being taken), through low resistance leads, we found that in order to get the regulator into a condition at which a reasonable trickle current, lying between the limits 1 and 4 amperes, for all conditions of speed and temperature should be delivered to the battery, it was necessary to give the regulator adjustment one complete turn in a direction of increasing the current. We thus arrived at a condition where the current delivered at low speeds in the regulating range, i.e. just at the commencement of regulation, was in the neighbourhood of one ampere for both the cold and hot conditions, whereas at the very highest speeds (3500 R.P.M.) this current varied between 3 and 4 amperes. We were satisfied with this setting as giving a reasonably small and constant current for all conditions of speed and temperature. It should be remarked that without the vibration which we gave to the switchbox, the current did not necessarily keep to the limits mentioned. If the dynamo were run up without giving the switchbox vibration, the current might rise to 6 amperes, but could be brought back by tapping the switchbox. Having attained this condition we allowed a discharge current to take place from the battery at the same time as the dynamo and regulator were operating upon it, and the final condition results we obtained are shown in the following table, all the figures of which are in amperes. :- Contd. | ||