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 analysis of a 5-inch diameter lengthened 37 section slow taper sliding armature sequence motor.
| Identifier | WestWitteringFiles\T\2July1929-December1929\ Scan024 | |
| Date | 1st July 1929 guessed | |
| -7- contd. 6. UP TO DATE R.R. S.S. 5" DIAMETER LENGTHENED 37 SECTION SLOW TAPER SLIDING ARMATURE SEQUENCE MOTOR. Maximum overall efficiency is .485 and occurs at 125 amperes, the corresponding electrical and mechanical efficiencies being .69 and .70. %s curve is good without too great saturation. Stalling torque is good. The mechanical efficiency is lower than it would be owing to the use of a large diameter front bearing. The motor appears to be very well proportioned electrically for its job. In addition to the above a table is attached giving comparative brake test quantities for these motors, the common basis being a conductor torque of 90 pound-inches. On this table there is also given for comparison, a row of R.R. sequence motor design figures. It transpires however that a more interesting comparison of the actual motor with the design figures is afforded on the basis of the same current, and therefore power supplied for it so happens that the brake torque, speed, brake horse power and overall efficiency are nearly the same. The electrical efficiency is considerably better than the design figure, for two reasons (a) Electrically, in that we were able to get in a better cross section of copper than anticipated, and (b) Magnetically, in that the working flux per pole came out better than anticipated, largely due to the utilisation of fewer and therefore | ||