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 a Lucas starter motor, type N, number M.45.C.
| Identifier | ExFiles\Box 142\3\ scan0353 | |
| Date | 24th September 1937 | |
| To by.{R.W. Bailey - Chief Engineer} from RM{William Robotham - Chief Engineer}/RC.{R. Childs} o.{Mr Oldham} By/ c. RM.{William Robotham - Chief Engineer} 1204. RM{William Robotham - Chief Engineer}/RC.{R. Childs}6/MH.{M. Huckerby}24.9.37. RE TEST ON LUCAS STARTER MOTOR TYPE N. No. M.45.C. We have now completed the examination of the Starter Motor submitted by Messrs. Lucas. The motor was subjected to our production test, the results of which are as follows - Light Test. The commutator-end bearing ran hot after five minutes: figures taken during test are :- 29 amperes at 4.5 volts at a speed of 1760 R.P.M. At the end of the test the centre of the commutator end bracket was approximately 70°c. After cooling down the bearing became very noisy. We do not attach much importance to this, as in normal service, the motor would never be subjected to a prolonged run at this speed. The motor was dismantled and the bearings packed with high melting point grease: the motor was re-assembled and the load test carried out without further trouble. Load Test. Electrical Input:- 204 amperes at 8.667 volts, the armature speed being 986 R.P.M. A motor torque of 81.5 lb.ins. was obtained. Intermittent Load Test. Electrical Input:- 200 amperes at 8.667 volts: five engagements per minutes, 4 seconds on, and 8 seconds off. Working under these conditions the motor completed 1000 engagements. The engagement is definitely noisy. Performance tests were carried out and curves drawn comparing the performance of the Lucas machine against a standard Bentley machine. | ||