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).
Specification for the production testing of a starter motor and reduction gear.
| Identifier | ExFiles\Box 70\4\ scan0143 | |
| Date | 30th January 1925 | |
| X8781sm EFCl/T30.1.25. + X.8781sm. SPECIFICATION OF PRODUCTION TEST OF R.R. STARTER MOTOR & REDUCTION GEAR. X.3082. In tests (1) and (2) below, the circuit of the motor should include an electrically operated main switch (in addition to the ammeter) and it will be found more convenient, owing to the necessity of changing over between the six-volts and 12-volts, or vice versa, to operate this switch in series with a standard actuator box (see Test 3) by means of an independent 12-volt battery and tumber switch. TEST 1. LIGHT TEST. The motor and gear shall be run light for a period of half an hour on a battery of three accumulator cells in series. Towards the end of the run the current taken must not exceed 17.5 amperes. This ensures :- (a) That the mechanical friction of the motor is within reasonable limits, and (b) that the magnetic circuit of the motor is sufficiently good. The geared down speed will be in the neighbourhood of 600 r.p.m. and the motor speed in the neighbourhood of 3600 r.p.m. but the speed need not be observed on this test. Current in excess of 17.5 amperes implies either or both of the following :- (a) Mechanical friction of motor is too great and the chief probability is that the gears require easing. (b) Provided the motor is alright as regards (a) excessive current means that the magnetic circuit of the motor is bad. This might occur as the result of too large Contd. | ||