Specification of inspection and test for a Lucas E.575 Dynamo.
| Identifier | ExFiles\Box 36\4\ scan 013 | |
| Date | 21th April 1920 | |
| X3014b 21.4.20. X.3014b - LUCAS E.575 DYNAMO X+1627 do. SPECIFICATION OF INSPECTION & TEST. (1) Inspect the brush mechanism to make sure that all brushes have the necessary freedom, and that the spring pressures are suitable when set at the first stage of their adjustments. (2) The dynamo in a cold condition but not lower in temperature than 15°C shall be driven at a speed of 615 R.P.M., when the open circuit voltage shall exceed 12.4 NOTE:- Before taking this reading, the dynamo should momentarily be speeded up so as to reach an open circuit voltage of about double the voltage at which it operates normally. (3) The dynamo shall be run on load for 20 minutes at 1750 r.p.m. charging a twelve volt battery of ample capacity, at the end of which time the output shall not be less than 11.5 amperes, the dynamo terminal voltage being not more than 15.0. (4) Immediately after this it should be verified that the dynamo shows a voltage on open circuit of at least 13.6 at a speed of 715 R.P.M. (5) The dynamo shall again be run on load and its speed varied up and down with a view to testing for mechanical and electrical noise. The speed at which electrical noise is generally prevalent is such as to correspond to an output of about 4 amps, for instance, about 850 to 900 R.P.M. | ||
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).