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).
Test report on dynamo and regulator performance, detailing current output and operational issues.
| Identifier | WestWitteringFiles\F\February1921\ Scan101 | |
| Date | 14th February 1921 | |
| -4- Contd. | Constant curr. taken from battery terminals. | Curr. delvd. by dynamo & regulator when cold. | Final and steady curr. delvd. by dynamo & regulator. | Final excess amps. available to charge battery. | Remarks. | |---|---|---|---|---| | 0 | 1.0 - 3.0 | 1.0 - 4.0 | - | - | | 5.0 | 6.5 | 7.0 | 2.0 | Not materially altered by speed. | | 10.0 | 11.0 | 12.0 | 2.0 | | | 15.0 | 13.5 | 18.0 | 4.5 | Variation of speed caused the current delivered by the dyn. & reg. to vary from 16 to 18 amps. In 45 mins. dyn. got too hot for further running. | Whilst obtaining the above results we were troubled a little at first, but more latterly, by the regulator armature frequently sticking up on the insulated ring, and nearly by short circuiting the field winding, reducing the excitation of the dynamo to about 3 volts, at which voltage it would deliver quite a large current through the series coil and carbon granules of the regulator, causing the regulator quickl to overheat. Sometimes a knock would restore the correct condition, but latterly the trouble was so persistent that it was quite impossible to take a second open circuit voltage curve with the regulator as now set by trial for suitable current. contd. | ||