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).
Performance and efficiency analysis for the Standard 6' Phantom motor and the Original No.1 Scheme 5' Sequence motor.
| Identifier | WestWitteringFiles\T\2July1929-December1929\ Scan022 | |
| Date | 1st July 1929 guessed | |
| -5- contd. 1. R.R. STANDARD 6" DIAMETER PHANTOM MOTOR WITH 6 : 1 REDUCTION GEAR AND 45 ARMATURE SECTIONS. At the time the results for this motor were observed we did not use the definite volt-ampere characteristic of supply mentioned in our first paragraph. The terminal voltages however do not differ widely from the rule (as indicated on curves). Curves of counter E.M.F. eg observed by driving the armature at the same speed in a field due to the same current passing through the field windings only, and of flux per pole Øe calculated therefrom, are included in the curves given for this motor. The maximum overall efficiency is .71 and occurs at 60 amperes, the corresponding electrical and mechanical efficiencies being .77 and .92 respectively, the latter including the effect of the epicyclic gear. Features exhibited by the curves :- High mechanical efficiency (Tr{Capt. F. W. Turner - Finance}/Ts) and reasonable absence of saturation (ØB & Øe). 2. ORIGINAL NO.1 SCHEME 5" DIAMETER SEQUENCE MOTOR (G) WITH PARALLEL ARMATURE OF 4 SECTIONS AND 96 : 31 REDUCTION GEAR. Maximum overall efficiency is .51 and occurs at 105 amperes, the corresponding electrical and mechanical efficiencies being .73 and .70 respectively, the latter including the effect of the epicyclic gear. Poor stalling | ||